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2. Current water quality guidelines across North America and Europe do not protect lakes from salinization

Author

Hintz, William D, Arnott, Shelley E, Symons, Celia C, Greco, Danielle A, McClymont, Alexandra, Brentrup, Jennifer A, Cañedo-Argüelles, Miguel, Derry, Alison M, Downing, Amy L, Gray, Derek K, Melles, Stephanie J, Relyea, Rick A, Rusak, James A, Searle, Catherine L, Astorg, Louis, Baker, Henry K, Beisner, Beatrix E, Cottingham, Kathryn L, Ersoy, Zeynep, Espinosa, Carmen, Franceschini, Jaclyn, Giorgio, Angelina T, Göbeler, Norman, Hassal, Emily, Hébert, Marie-Pier, Huynh, Mercedes, Hylander, Samuel, Jonasen, Kacie L, Kirkwood, Andrea E, Langenheder, Silke, Langvall, Ola, Laudon, Hjalmar, Lind, Lovisa, Lundgren, Maria, Proia, Lorenzo, Schuler, Matthew S, Shurin, Jonathan B, Steiner, Christopher F, Striebel, Maren, Thibodeau, Simon, Urrutia-Cordero, Pablo, Vendrell-Puigmitja, Lidia, and Weyhenmeyer, Gesa A

Subjects
Life on Land, Animals, Anthropogenic Effects, Ecosystem, Europe, Guidelines as Topic, Lakes, North America, Salinity, Water Quality, Zooplankton, biodiversity, climate change, environmental policy, land use, water quality
Abstract

Human-induced salinization caused by the use of road deicing salts, agricultural practices, mining operations, and climate change is a major threat to the biodiversity and functioning of freshwater ecosystems. Yet, it is unclear if freshwater ecosystems are protected from salinization by current water quality guidelines. Leveraging an experimental network of land-based and in-lake mesocosms across North America and Europe, we tested how salinization-indicated as elevated chloride (Cl-) concentration-will affect lake food webs and if two of the lowest Cl- thresholds found globally are sufficient to protect these food webs. Our results indicated that salinization will cause substantial zooplankton mortality at the lowest Cl- thresholds established in Canada (120 mg Cl-/L) and the United States (230 mg Cl-/L) and throughout Europe where Cl- thresholds are generally higher. For instance, at 73% of our study sites, Cl- concentrations that caused a ≥50% reduction in cladoceran abundance were at or below Cl- thresholds in Canada, in the United States, and throughout Europe. Similar trends occurred for copepod and rotifer zooplankton. The loss of zooplankton triggered a cascading effect causing an increase in phytoplankton biomass at 47% of study sites. Such changes in lake food webs could alter nutrient cycling and water clarity and trigger declines in fish production. Current Cl- thresholds across North America and Europe clearly do not adequately protect lake food webs. Water quality guidelines should be developed where they do not exist, and there is an urgent need to reassess existing guidelines to protect lake ecosystems from human-induced salinization.

Published
2022

4. First report of female gametangia in the invasive macroalga starry stonewort (Nitellopsis obtusa) in North America

Author

J. Harrow-Lyle, Tyler, Ginn, Brian K., Kirkwood, Andrea E., and Melles, Stephanie J.

Subjects
Plant introduction -- Identification and classification, Charophytes -- Identification and classification, Gametogenesis -- Analysis, Biological sciences
Abstract

Nitellopsis obtusa (Desv.) J. Groves (starry stonewort) is a macroalga in the Characeae family first documented in North America c. 1974. Since initial introduction, N obtusa clonal populations quickly established in inland lakes as early as 2005. Despite increased N obtusa monitoring over the last decade, only sterile or male specimens were documented in North America; however, during routine monitoring in Lake Simcoe and Lake Scugog in 2022, we discovered the presence of female gametangia on N obtusa. In addition, two other Characeae genera had prevalent antheridia and oogonia, co-occurring with oogonia-presenting N obtusa, which had not been observed previously despite intensive monitoring since 2008. Further studies in North America are required to confirm the proportion of female populations present within invaded regions, as well as to identify plausible causes shifting gametangia development across non-native and native Characeae, especially within the context of climate change. The presence of oogonia on N obtusa represents a major change to our understanding of this species and its reproductive ecology in North America. Key words: oogonia, sexual reproduction, Characeae, stoneworts, Introduction Nitellopsis obtusa (Desv.) J. Groves, 1919, is a macroscopic alga belonging to the Characeae family, and the species is considered invasive in North America. How N obtusa was introduced [...]

Published
2023
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9. The invasive macrophyte Nitellopsis obtusa may facilitate the invasive mussel Dreissena polymorpha and Microcystis blooms in a large, shallow lake

Author

Harrow-Lyle, Tyler and Kirkwood, Andrea E.

Subjects
Ecosystems -- Analysis, Reservoirs -- Analysis, Earth sciences
Abstract

This study was conducted in Lake Scugog, a large, shallow reservoir in Ontario, Canada. Historically, Lake Scugog has been a macrophyte-dominated ecosystem with a productive fishery. In recent years, periodic Microcystis blooms have erupted coinciding with the discovery of the non-native macroalga Nitellopsis obtusa in the lake. From 2016 to 2018, we conducted field surveys to assess the physical, chemical, and biological conditions across 12 sites spanning the lake. All study species (N. obtusa, Dreissena polymorpha, and Microcystis spp.) increased from 2016 to 2018. To determine potential biotic and abiotic drivers of Microcystis blooms, we used a structural equation modelling (SEM) approach. The SEM ([r.sup.2] = 0.27, p < 0.05) revealed several positive (precipitation, chloride, depth, and N. obtusa) and negative (total nitrogen) explanatory variables for Microcystis biomass. The only statistically significant biotic driver was N. obtusa, which was a positive explanatory variable for both D. polymorpha and Microcystis. Future work will test the efficacy of the SEM model across Ontario lakes to confirm the facilitative role of N. obtusa on D. polymorpha and Microcystis populations. La presente etude a ete realisee dans le lac Scugog, un grand reservoir peu profond en Ontario (Canada). Par le passe, ce lac etait un ecosysteme dans lequel dominaient les macrophytes et il soutenait une peche productive. Ces dernieres annees, des proliferations periodiques de Microcystis ont eu lieu, coincidant avec la decouverte de la macroalgue non indigene Nitellopsis obtusa dans le lac. De 2016 a 2018, nous avons effectue des releves sur le terrain dans le but d'evaluer les conditions physiques, chimiques et biologiques dans 12 sites a la grandeur du lac. L'abondance de toutes les especes etudiees (N. obtusa, Dreissena polymorpha et Microcystis spp.) a augmente durant cette periode. Afin de determiner les facteurs biotiques et abiotiques qui pourraient favoriser les proliferations de Microcystis, nous avons utilise une approche de modelisation d'equations structurelles (MES). La MES ([r.sup.2] = 0, 27, p < 0,05) a fait ressortir plusieurs variables explicatives positives (precipitations, chlorure, profondeur et N. obtusa) et negative (azote total) associees a la biomasse de Microcystis. Le seul facteur biotique statistiquement significatif est N. obtusa, une variable explicative positive tant pour D. polymorpha que Microcystis. Des travaux futurs evalueront l'efficacite du modele SEM dans d'autres lacs de l'Ontario afin de confirmer l'effet de facilitation de N. obtusa sur les populations de D. polymorpha et Microcystis. [Traduit par la Redaction], Introduction Aquatic invasive species in Canadian inland waters are an increasing problem that pose major socio-ecological impacts. The invasive mussel Dreissena polymorpha is no exception and was first discovered in [...]

Published
2020
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10. Compliance and enforcement in a brave new (green) world: best practices and technologies for green governance

Author

Omrow, Delon, Anagnostou, Michelle, Cassey, Phillip, Cooke, Steven J., Jordan, Sheldon, Kirkwood, Andrea E., MacNeill, Timothy, Mirrlees, Tanner, Pedersen, Isabel, Stoett, Peter, and Tlusty, Michael F.

Abstract

International and transnational cooperation is needed to strengthen environmental governance initiatives with advanced technologies. In January 2023, Ontario Tech University hosted a symposium entitled Tech With a Green Governance Conscience: Exploring the Technology–Environmental Policy Nexus.Attendees spanned diverse disciplines, sectors, and countries, bringing unique and diverse perspectives to the technology–environmental policy nexus. Emergent themes arising from the symposium include the role of artificial intelligence in environmental governance, while eliminating the detrimental social impacts associated with these advanced technologies via algorithmic bias, misunderstanding, and unaccountability. The symposium explored the tech–society–ecology interface, such as the authoritarian intensification of digitalized environmental governance, “technocracy”, and the ethical implications of sacrificing democratic legitimacy in the face of imminent environmental destruction. Select participants (i.e., co-authors) at the symposium provided input on a preliminary framework, which led to this perspective article focused on the politics surrounding greengovernance in the 21st century. We conclude that while emerging technologies are being deployed to address grand environmental challenges such as climate change, biodiversity loss, and resource depletion, the use of these various technologies for progressive environmental policy development and enforcement requires co-productivist approaches to constructive technology assessments and embracing the concept of technologies of humility. This necessitates a space for dialogue, reflection, and deliberation on leading adaptive environmental governance in the face of power and politics, as we interrogate the putative neutrality of advanced technology and techno-solutionism.

Published
2024
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19. Current water quality guidelines across North America and Europe do not protect lakes from salinization

Author

Hintz, William D., Arnott, Shelley E., Symons, Celia C., Greco, Danielle A., McClymont, Alexandra, Brentrup, Jennifer A., Canedo-Arguelles, Miguel, Derry, Alison M., Downing, Amy L., Gray, Derek K., Melles, Stephanie J., Relyea, Rick A., Rusak, James A., Searle, Catherine L., Astorg, Louis, Baker, Henry K., Beisner, Beatrix E., Cottingham, Kathryn L., Ersoy, Zeynep, Espinosa, Carmen, Franceschini, Jaclyn, Giorgio, Angelina T., Gobeler, Norman, Hassal, Emily, Hebert, Marie-Pier, Huynh, Mercedes, Hylander, Samuel, Jonasen, Kacie L., Kirkwood, Andrea E., Langenheder, Silke, Langvall, Ola, Laudon, Hjalmar, Lind, Lovisa, Lundgren, Maria, Proia, Lorenzo, Schuler, Matthew S., Shurin, Jonathan B., Steiner, Christopher F., Striebel, Maren, Thibodeau, Simon, Urrutia-Cordero, Pablo, Vendrell-Puigmitja, Lidia, Weyhenmeyer, Gesa A., Hintz, William D., Arnott, Shelley E., Symons, Celia C., Greco, Danielle A., McClymont, Alexandra, Brentrup, Jennifer A., Canedo-Arguelles, Miguel, Derry, Alison M., Downing, Amy L., Gray, Derek K., Melles, Stephanie J., Relyea, Rick A., Rusak, James A., Searle, Catherine L., Astorg, Louis, Baker, Henry K., Beisner, Beatrix E., Cottingham, Kathryn L., Ersoy, Zeynep, Espinosa, Carmen, Franceschini, Jaclyn, Giorgio, Angelina T., Gobeler, Norman, Hassal, Emily, Hebert, Marie-Pier, Huynh, Mercedes, Hylander, Samuel, Jonasen, Kacie L., Kirkwood, Andrea E., Langenheder, Silke, Langvall, Ola, Laudon, Hjalmar, Lind, Lovisa, Lundgren, Maria, Proia, Lorenzo, Schuler, Matthew S., Shurin, Jonathan B., Steiner, Christopher F., Striebel, Maren, Thibodeau, Simon, Urrutia-Cordero, Pablo, Vendrell-Puigmitja, Lidia, and Weyhenmeyer, Gesa A.

Abstract

Human-induced salinization caused by the use of road deicing salts, agricultural practices, mining operations, and climate change is a major threat to the biodiversity and functioning of freshwater ecosystems. Yet, it is unclear if freshwater ecosystems are protected from salinization by current water quality guidelines. Leveraging an experimental network of land-based and in-lake mesocosms across North America and Europe, we tested how salinization—indicated as elevated chloride (Cl2) concentration—will affect lake food webs and if two of the lowest Cl2 thresholds found globally are sufficient to protect these food webs. Our results indicated that salinization will cause substantial zooplankton mortality at the lowest Cl2 thresholds established in Canada (120 mg Cl2/L) and the United States (230 mg Cl2/L) and throughout Europe where Cl2 thresholds are generally higher. For instance, at 73% of our study sites, Cl2 concentrations that caused a ≥50% reduction in cladoceran abundance were at or below Cl2 thresholds in Canada, in the United States, and throughout Europe. Similar trends occurred for copepod and rotifer zooplankton. The loss of zooplankton triggered a cascading effect causing an increase in phytoplankton biomass at 47% of study sites. Such changes in lake food webs could alter nutrient cycling and water clarity and trigger declines in fish production. Current Cl2 thresholds across North America and Europe clearly do not adequately protect lake food webs. Water quality guidelines should be developed where they do not exist, and there is an urgent need to reassess existing guidelines to protect lake ecosystems from human-induced salinization.

Published
2022
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20. Global patterns and controls of nutrient immobilization on decomposing cellulose in riverine ecosystems

Author

Costello, David M., Tiegs, Scott D., Boyero, Luz, Canhoto, Cristina, Capps, Krista A., Danger, Michael, Frost, Paul C., Gessner, Mark O., Griffiths, Natalie A., Halvorson, Halvor M., Kuehn, Kevin A., Marcarelli, Amy M., Royer, Todd V., Mathie, Devan M., Albariño, Ricardo J., Arango, Clay P., Aroviita, Jukka, Baxter, Colden V., Bellinger, Brent J., Bruder, Andreas, Burdon, Francis J., Callisto, Marcos, Camacho, Antonio, Colas, Fanny, Cornut, Julien, Crespo-Pérez, Verónica, Cross, Wyatt F., Derry, Alison M., Douglas, Michael M., Elosegi, Arturo, de Eyto, Elvira, Ferreira, Verónica, Ferriol, Carmen, Fleituch, Tadeusz, Follstad Shah, Jennifer J., Frainer, André, Garcia, Erica A., García, Liliana, García, Pavel E., Giling, Darren P., Gonzales-Pomar, R. Karina, Graça, Manuel A. S., Grossart, Hans-Peter, Guérold, François, Hepp, Luiz U., Higgins, Scott N., Hishi, Takuo, Iñiguez-Armijos, Carlos, Iwata, Tomoya, Kirkwood, Andrea E., Koning, Aaron A., Kosten, Sarian, Laudon, Hjalmar, Leavitt, Peter R., Lemes da Silva, Aurea L., Leroux, Shawn J., LeRoy, Carri J., Lisi, Peter J., Masese, Frank O., McIntyre, Peter B., McKie, Brendan G., Medeiros, Adriana O., Miliša, Marko, Miyake, Yo, Mooney, Robert J., Muotka, Timo, Nimptsch, Jorge, Paavola, Riku, Pardo, Isabel, Parnikoza, Ivan Y., Patrick, Christopher J., Peeters, Edwin T. H. M., Pozo, Jesus, Reid, Brian, Richardson, John S., Rincón, José, Risnoveanu, Geta, Robinson, Christopher T., Santamans, Anna C., Simiyu, Gelas M., Skuja, Agnija, Smykla, Jerzy, Sponseller, Ryan A., Teixeira-de Mello, Franco, Vilbaste, Sirje, Villanueva, Verónica D., Webster, Jackson R., Woelfl, Stefan, Xenopoulos, Marguerite A., Yates, Adam G., Yule, Catherine M., Zhang, Yixin, Zwart, Jacob A., Costello, David M., Tiegs, Scott D., Boyero, Luz, Canhoto, Cristina, Capps, Krista A., Danger, Michael, Frost, Paul C., Gessner, Mark O., Griffiths, Natalie A., Halvorson, Halvor M., Kuehn, Kevin A., Marcarelli, Amy M., Royer, Todd V., Mathie, Devan M., Albariño, Ricardo J., Arango, Clay P., Aroviita, Jukka, Baxter, Colden V., Bellinger, Brent J., Bruder, Andreas, Burdon, Francis J., Callisto, Marcos, Camacho, Antonio, Colas, Fanny, Cornut, Julien, Crespo-Pérez, Verónica, Cross, Wyatt F., Derry, Alison M., Douglas, Michael M., Elosegi, Arturo, de Eyto, Elvira, Ferreira, Verónica, Ferriol, Carmen, Fleituch, Tadeusz, Follstad Shah, Jennifer J., Frainer, André, Garcia, Erica A., García, Liliana, García, Pavel E., Giling, Darren P., Gonzales-Pomar, R. Karina, Graça, Manuel A. S., Grossart, Hans-Peter, Guérold, François, Hepp, Luiz U., Higgins, Scott N., Hishi, Takuo, Iñiguez-Armijos, Carlos, Iwata, Tomoya, Kirkwood, Andrea E., Koning, Aaron A., Kosten, Sarian, Laudon, Hjalmar, Leavitt, Peter R., Lemes da Silva, Aurea L., Leroux, Shawn J., LeRoy, Carri J., Lisi, Peter J., Masese, Frank O., McIntyre, Peter B., McKie, Brendan G., Medeiros, Adriana O., Miliša, Marko, Miyake, Yo, Mooney, Robert J., Muotka, Timo, Nimptsch, Jorge, Paavola, Riku, Pardo, Isabel, Parnikoza, Ivan Y., Patrick, Christopher J., Peeters, Edwin T. H. M., Pozo, Jesus, Reid, Brian, Richardson, John S., Rincón, José, Risnoveanu, Geta, Robinson, Christopher T., Santamans, Anna C., Simiyu, Gelas M., Skuja, Agnija, Smykla, Jerzy, Sponseller, Ryan A., Teixeira-de Mello, Franco, Vilbaste, Sirje, Villanueva, Verónica D., Webster, Jackson R., Woelfl, Stefan, Xenopoulos, Marguerite A., Yates, Adam G., Yule, Catherine M., Zhang, Yixin, and Zwart, Jacob A.

Abstract

Microbes play a critical role in plant litter decomposition and influence the fate of carbon in rivers and riparian zones. When decomposing low-nutrient plant litter, microbes acquire nitrogen (N) and phosphorus (P) from the environment (i.e., nutrient immobilization), and this process is potentially sensitive to nutrient loading and changing climate. Nonetheless, environmental controls on immobilization are poorly understood because rates are also influenced by plant litter chemistry, which is coupled to the same environmental factors. Here we used a standardized, low-nutrient organic matter substrate (cotton strips) to quantify nutrient immobilization at 100 paired stream and riparian sites representing 11 biomes worldwide. Immobilization rates varied by three orders of magnitude, were greater in rivers than riparian zones, and were strongly correlated to decomposition rates. In rivers, P immobilization rates were controlled by surface water phosphate concentrations, but N immobilization rates were not related to inorganic N. The N:P of immobilized nutrients was tightly constrained to a molar ratio of 10:1 despite wide variation in surface water N:P. Immobilization rates were temperature-dependent in riparian zones but not related to temperature in rivers. However, in rivers nutrient supply ultimately controlled whether microbes could achieve the maximum expected decomposition rate at a given temperature. Collectively, we demonstrated that exogenous nutrient supply and immobilization are critical control points for decomposition of organic matter.

Published
2022
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23. Global Patterns and Controls of Nutrient Immobilization on Decomposing Cellulose in Riverine Ecosystems

Author

Costello, David M., primary, Tiegs, Scott D., additional, Boyero, Luz, additional, Canhoto, Cristina, additional, Capps, Krista A., additional, Danger, Michael, additional, Frost, Paul C., additional, Gessner, Mark O., additional, Griffiths, Natalie A., additional, Halvorson, Halvor M., additional, Kuehn, Kevin A., additional, Marcarelli, Amy M., additional, Royer, Todd V., additional, Mathie, Devan M., additional, Albariño, Ricardo J., additional, Arango, Clay P., additional, Aroviita, Jukka, additional, Baxter, Colden V., additional, Bellinger, Brent J., additional, Bruder, Andreas, additional, Burdon, Francis J., additional, Callisto, Marcos, additional, Camacho, Antonio, additional, Colas, Fanny, additional, Cornut, Julien, additional, Crespo‐Pérez, Verónica, additional, Cross, Wyatt F., additional, Derry, Alison M., additional, Douglas, Michael M., additional, Elosegi, Arturo, additional, de Eyto, Elvira, additional, Ferreira, Verónica, additional, Ferriol, Carmen, additional, Fleituch, Tadeusz, additional, Follstad Shah, Jennifer J., additional, Frainer, André, additional, Garcia, Erica A., additional, García, Liliana, additional, García, Pavel E., additional, Giling, Darren P., additional, Gonzales‐Pomar, R. Karina, additional, Graça, Manuel A. S., additional, Grossart, Hans‐Peter, additional, Guérold, François, additional, Hepp, Luiz U., additional, Higgins, Scott N., additional, Hishi, Takuo, additional, Iñiguez‐Armijos, Carlos, additional, Iwata, Tomoya, additional, Kirkwood, Andrea E., additional, Koning, Aaron A., additional, Kosten, Sarian, additional, Laudon, Hjalmar, additional, Leavitt, Peter R., additional, Lemes da Silva, Aurea L., additional, Leroux, Shawn J., additional, LeRoy, Carri J., additional, Lisi, Peter J., additional, Masese, Frank O., additional, McIntyre, Peter B., additional, McKie, Brendan G., additional, Medeiros, Adriana O., additional, Miliša, Marko, additional, Miyake, Yo, additional, Mooney, Robert J., additional, Muotka, Timo, additional, Nimptsch, Jorge, additional, Paavola, Riku, additional, Pardo, Isabel, additional, Parnikoza, Ivan Y., additional, Patrick, Christopher J., additional, Peeters, Edwin T. H. M., additional, Pozo, Jesus, additional, Reid, Brian, additional, Richardson, John S., additional, Rincón, José, additional, Risnoveanu, Geta, additional, Robinson, Christopher T., additional, Santamans, Anna C., additional, Simiyu, Gelas M., additional, Skuja, Agnija, additional, Smykla, Jerzy, additional, Sponseller, Ryan A., additional, Teixeira‐de Mello, Franco, additional, Vilbaste, Sirje, additional, Villanueva, Verónica D., additional, Webster, Jackson R., additional, Woelfl, Stefan, additional, Xenopoulos, Marguerite A., additional, Yates, Adam G., additional, Yule, Catherine M., additional, Zhang, Yixin, additional, and Zwart, Jacob A., additional

Published
2022
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31. Didymosphenia geminata in two Alberta headwater rivers: an emerging invasive species that challenges conventional views on algal bloom development

Author

Kirkwood, Andrea E., Shea, Troina, Jackson, Leland J., and McCauley, Edward

Subjects
Diatoms -- Identification and classification, Invasive species -- Research, Earth sciences
Abstract

The diatom Didymosphenia geminata (Bacillariophyceae) has garnered increased attention as a nuisance and invasive species in freshwater systems. Historically described as rare yet cosmopolitan, a suspected new variant of D. geminata has the capacity to inundate kilometres of river bottom during a bloom. Unlike most other bloom-forming algae, D. geminata proliferates under high water quality (i.e., low turbidity and low nutrient) conditions. To inform management strategies, the environmental factors and conditions that promote bloom events must be ascertained. Our study of the Bow and Red Deer rivers in southern Alberta, Canada, provides supporting evidence that the mean flow regime is associated with bloom development, based on a significant negative relationship detected between D. geminata biomass and mean discharge (r = 0.30). While flow regulation by dams can create the stable flow environment preferred by D. geminata, our results indicate that flow regime (rather than just proximity to dam outflows) is the likely mechanism, in addition to other environmental factors, such as water clarity, temperature, pH, conductivity, and total phosphorus. We discuss the formidable challenges to D. geminata management, particularly along unregulated river reaches, yet also recognize the unique research opportunities that this organism poses for the growing field of invasion biology. La diatomee Didymosphenia geminata (Bacillariophyceae) attire de plus en plus l'attention comine espece nocive et envahissante dans les systemes d'eau douce. Decrite dans le passe comme rare, bien que cosmopolite. D. geminata semble presenter une nouvelle forme capable de couvrir des kilometres de lit de riviere durant un episode d'efflorescence. Contrairement a la plupart des autres algues qui connaissent des proliferations, D. geminala foisonne dans des conditions de qualite d'eau de crue (c'est-a-dire de faible turbidite et de concentrations basses de nutriments). Afin d'obtenir les assises necessaires pour les strategies de gestion, il est essentiel de determiner les facteurs et les conditions du milieu qui favorisent les episodes de proliferation. Notre etude faite dans les rivieres Bow et Red Deer dans le sud de l'Alberta, Canada, fournit des indications que le regime moyen du debit est relie au developpement des efflorescences, puisqu'elle revele l'existence d'une relation negative significative entre la biomasse de D. geminata et le debit moyen ([r.sup.2] = 0,30). Bien que le controle du debil par les barrages puisse creer l'environnemen! de debit stable prefere par D. geminata, nos resultats indiquent que le regime de debil (plutot que la seule proximite des emissaires des barrages) constitue vraisemblablement le mecanisme important, en plus des autres facteurs du milieu, tels que la clarte de l'eau, la temperature, le pH, la conductivite et le phosphore total. Nous discutons des defis considerables que genere la gestion de D. geminata. particulierement dans les sections de riviere a debit non controle, tout en reconnaissant aussi les occasions de recherche que cet organisme fournit dans le domaine en expansion de la biologie des invasions. [Traduit par la Redaction], Introduction Didymosphenia geminata (Lyngbye) M. Schmidt, 1899 has historically been described as a cosmopolitan, but rare, lotic diatom normally found in moderately flowing, cool to cold-water montane and boreal forest [...]

Published
2007

32. Pervasive changes to the lower aquatic food web following Nitellopsis obtusa establishment in a large, shallow lake.

Author

Harrow‐Lyle, Tyler J. and Kirkwood, Andrea E.

Subjects
*POTAMOGETON, *FOOD chains, *MACROPHYTES, *ECOSYSTEMS, *INTRODUCED species, *EURASIAN watermilfoil, *LATENT variables, *FISH communities
Abstract

Nitellopsis obtusa was first reported in North America in 1974. The overall ecological threat that N. obtusa poses towards freshwater ecosystems in its non‐native range is thought to be similar to other invasive macrophyte species. However, few studies have evaluated the impacts to aquatic communities upon successful establishment of this species in North America. Despite N. obtusa being a non‐native invasive species in North America, it is considered a beneficial macrophyte within its native range in EurasiaWe evaluated the impacts associated with the non‐native invasive charophyte N. obtusa on the lower aquatic food web (LAFW) communities (phytoplankton, macroinvertebrates, and macrophytes) in a large, shallow lake in Ontario, Canada. To tease apart abiotic and biotic factors that influence LAFW species assemblages, a generalised linear latent variable model (GLLVM) was used.Over the course of the 4‐year study period, N. obtusa abundance significantly increased throughout the lake (pairwise comparison, p < 0.001) and notable shifts in community composition occurred across years (PERMANOVA, p < 0.001), especially for the phytoplankton and macrophyte communities.Nitellopsis obtusa was also found to be associated with a decline in diversity, where Simpson's diversity indices across all LAFW communities decreased as a function of increasing N. obtusa biomass. The GLLVM analysis revealed significant negative associations between N. obtusa and the majority of LAFW taxa. Most notably, there was a significant (p < 0.001) negative relationship between Myriophyllum spicatum, a previously established non‐native invasive macrophyte, and N. obtusa. The GLLVM model also demonstrated that N. obtusa had positive co‐occurrence relationships with other members of the macrophyte community including Utricularia vulgaris, Najas flexilis, Potamogeton crispus, and Stuckenia pectinata.These results show for the first‐time significant impacts to the LAFW in an invaded ecosystem, which raises major concerns for fish communities that depend on the LAFW for food and habitat. Further studies are necessary to confirm the extent of these impacts in other invaded lakes. [ABSTRACT FROM AUTHOR]

Published
2022
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34. Science Advances

Author

Tiegs, Scott D., Costello, David M., Isken, Mark W., Woodward, Guy, McIntyre, Peter B., Gessner, Mark O., Chauvet, Eric, Griffiths, Natalie A., Flecker, Alex S., Acuña, Vicenç, Albariño, Ricardo, Allen, Daniel C., Alonso, Cecilia, Andino, Patricio, Arango, Clay, Aroviita, Jukka, Barbosa, Marcus V. M., Barmuta, Leon A., Baxter, Colden V., Bell, Thomas D. C., Bellinger, Brent, Boyero, Luz, Brown, Lee E., Bruder, Andreas, Bruesewitz, Denise A., Burdon, Francis J., Callisto, Marcos, Canhoto, Cristina, Capps, Krista A., Castillo, María M., Clapcott, Joanne, Colas, Fanny, Colón-Gaud, Checo, Cornut, Julien, Crespo-Pérez, Verónica, Cross, Wyatt F., Culp, Joseph M., Danger, Michael, Dangles, Olivier, de Eyto, Elvira, Derry, Alison M., Villanueva, Veronica Díaz, Douglas, Michael M., Elosegi, Arturo, Encalada, Andrea C., Entrekin, Sally, Espinosa, Rodrigo, Ethaiya, Diana, Ferreira, Verónica, Ferriol, Carmen, Flanagan, Kyla M., Fleituch, Tadeusz, Follstad Shah, Jennifer J., Frainer, André, Friberg, Nikolai, Frost, Paul C., Garcia, Erica A., García Lago, Liliana, García Soto, Pavel Ernesto, Ghate, Sudeep, Giling, Darren P., Gilmer, Alan, Gonçalves, José Francisco, Gonzales, Rosario Karina, Graça, Manuel A. S., Grace, Mike, Grossart, Hans-Peter, Guérold, François, Gulis, Vlad, Hepp, Luiz U., Higgins, Scott, Hishi, Takuo, Huddart, Joseph, Hudson, John, Imberger, Samantha, Iñiguez-Armijos, Carlos, Iwata, Tomoya, Janetski, David J., Jennings, Eleanor, Kirkwood, Andrea E., Koning, Aaron A., Kosten, Sarian, Kuehn, Kevin A., Laudon, Hjalmar, Leavitt, Peter R., Lemes da Silva, Aurea L., Leroux, Shawn J., LeRoy, Carri J., Lisi, Peter J., MacKenzie, Richard, Marcarelli, Amy M., Masese, Frank O., McKie, Brendan G., Oliveira Medeiros, Adriana, Meissner, Kristian, Miliša, Marko, Mishra, Shailendra, Miyake, Yo, Moerke, Ashley, Mombrikotb, Shorok, Mooney, Rob, Moulton, Tim, Muotka, Timo, Negishi, Junjiro N., Neres-Lima, Vinicius, Nieminen, Mika L., Nimptsch, Jorge, Ondruch, Jakub, Paavola, Riku, Pardo, Isabel, Patrick, Christopher J., Peeters, Edwin T. H. M., Pozo, Jesus, Pringle, Catherine, Prussian, Aaron, Quenta, Estefania, Quesada, Antonio, Reid, Brian, Richardson, John S., Rigosi, Anna, Rincón, José, Rîşnoveanu, Geta, Robinson, Christopher T., Rodríguez-Gallego, Lorena, Royer, Todd V., Rusak, James A., Santamans, Anna C., Selmeczy, Géza B., Simiyu, Gelas, Skuja, Agnija, Smykla, Jerzy, Sridhar, Kandikere R., Sponseller, Ryan, Stoler, Aaron, Swan, Christopher M., Szlag, David, Teixeira-de Mello, Franco, Tonkin, Jonathan D., Uusheimo, Sari, Veach, Allison M., Vilbaste, Sirje, Vought, Lena B. M., Wang, Chiao-Ping, Webster, Jackson R., Wilson, Paul B., Woelfl, Stefan, Xenopoulos, Marguerite A., Yates, Adam G., Yoshimura, Chihiro, Yule, Catherine M., Zhang, Yixin X., Zwart, Jacob A., School of Biological and Chemical Sciences, Queen Mary University of London (QMUL), Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB), Leibniz Association, Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, ICRA, Catalan Institute for Water Research, ICRA, Pontificia Universidad Catolica del Ecuador, Wetland ecology department (Seville, Espagne), Doñana biological station - CSIC (SPAIN), Swiss Federal Institute of Aquatic Science and Technology - EAWAG (SWITZERLAND), Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences – Uppsala, Sweden, Burdon, Universidade Federal de Minas Gerais [Belo Horizonte] (UFMG), Marine and environmental research centre - IMAR-CMA (Coimbra, Portugal), University of Coimbra [Portugal] (UC), GRET, Sécurité et Qualité des Produits d'Origine Végétale (SQPOV), Institut National de la Recherche Agronomique (INRA)-Avignon Université (AU), Laboratorio de Limnología [Bariloche], Instituto Nacional de Investigaciones en Biodiversidad y Medioambiente [Bariloche] (INIBIOMA-CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Universidad Nacional del Comahue [Neuquén] (UNCOMA)-Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Universidad Nacional del Comahue [Neuquén] (UNCOMA), Faculty of Science and Technology, University of the Basque Country, Polska Akademia Nauk (PAN), Norwegian Institute for Water Research (NIVA), Limnology of Stratified Lakes, IGB-Neuglobsow, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Faculty of Agriculture, Kyushu University, University of Bath [Bath], Yamanashi University, Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), University of Vienna [Vienna], University of Zagreb, VTT Information technology, Technical Research Centre of Finland, Instituto de Ciencias Marinas y Limnológicas, Universidate de Vigo, Hospital Universitario La Paz, Department of Biology, Universidad Autonoma de Madrid (UAM), Universidad del Zulia (LUZ), Department of River Ecology and Conservation, Senckenberg Research Institute and Natural History Museum Frankfurt, Gelnhausen, Germany, University of Southampton, Research Institute of New-Type Urbanization, Avignon Université (AU)-Institut National de la Recherche Agronomique (INRA), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Oakland University (USA), Kent State University, Imperial College London, Cornell University, Department of Ecology and Evolutionary Biology, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Climate Change Science Institute [Oak Ridge] (CCSI), Oak Ridge National Laboratory [Oak Ridge] (ORNL), UT-Battelle, LLC-UT-Battelle, LLC, Instituto Catalán de Investigación del Agua - ICRA (SPAIN) (ICRA), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Universidad Nacional del Comahue [Neuquén] (UNCOMA), DEPARTMENT OF BIOLOGY UNIVERSITY OF OKLAHOMA NORMAN USA, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), University of the Republic of Uruguay, Central Washington University, Finnish Environment Institute (SYKE), Federal University of Tocantins, University of Tasmania [Hobart, Australia] (UTAS), Idaho State University, Watershed Protection Department, Estación Biológica de Doñana (EBD), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), School of Geography, University of Leeds, Leeds, UK, Swiss Federal Insitute of Aquatic Science and Technology [Dübendorf] (EAWAG), Colby College, Department of Aquatic Sciences and Assessment, University of Georgia [USA], EI Colegio de la Frontera Sur (ECOSUR), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), Cawthron Institute, Risques, Ecosystèmes, Vulnérabilité, Environnement, Résilience (RECOVER), Aix Marseille Université (AMU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Georgia Southern University, University System of Georgia (USG), Pontifical Catholic University of Ecuador, Montana State University (MSU), Wilfrid Laurier University (WLU), Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Université Paul-Valéry - Montpellier 3 (UPVM)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Polska Akademia Nauk = Polish Academy of Sciences (PAN), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Terre et Environnement de Lorraine (OTELo), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Universidade de Vigo, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Department of Ecology and Evolutionary Biology [CALS], College of Agriculture and Life Sciences [Cornell University] (CALS), Cornell University [New York]-Cornell University [New York], Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Pontificia Universidad Católica del Ecuador, Universidade Federal do Tocantins (UFT), University of Leeds, Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École Pratique des Hautes Études (EPHE), Universidad Autónoma de Madrid (UAM), and Entomology

Subjects
Aquatic Ecology and Water Quality Management, riparian zones, ORGANIC-MATTER DECOMPOSITION, Biodiversité et Ecologie, Oceanografi, hydrologi och vattenresurser, Carbon Cycle, CARBON, ekosysteemit, Oceanography, Hydrology and Water Resources, biomes, biomit, ddc:570, carbon cycle, Humans, STREAMS, Life Science, Human Activities, Riparian zones, TEMPERATURE, Institut für Biochemie und Biologie, Ecosystem, ComputingMilieux_MISCELLANEOUS, SDG 15 - Life on Land, aquatic ecosystems, Science & Technology, WIMEK, hiilen kierto, vesiekosysteemit, Aquatic Ecology, Aquatische Ecologie en Waterkwaliteitsbeheer, rivers, Multidisciplinary Sciences, ekosysteemit (ekologia), Biomonitoring, articles, Science & Technology - Other Topics, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, ecosystems, joet, Environmental Monitoring
Abstract

River ecosystems receive and process vast quantities of terrestrial organic carbon, the fate of which depends strongly on microbial activity. Variation in and controls of processing rates, however, are poorly characterized at the global scale. In response, we used a peer-sourced research network and a highly standardized carbon processing assay to conduct a global-scale field experiment in greater than 1000 river and riparian sites. We found that Earth’s biomes have distinct carbon processing signatures. Slow processing is evident across latitudes, whereas rapid rates are restricted to lower latitudes. Both the mean rate and variability decline with latitude, suggesting temperature constraints toward the poles and greater roles for other environmental drivers (e.g., nutrient loading) toward the equator. These results and data set the stage for unprecedented “next-generation biomonitoring” by establishing baselines to help quantify environmental impacts to the functioning of ecosystems at a global scale. This research was supported by awards to S.D.T. from the Ecuadorian Ministry of Science [Secretaría de Educación Superior Ciencia, Tecnología e Innovación (SENESCYT)] through the PROMETEO scholar exchange program, the Oakland University Research Development Grant program, and a Huron Mountain Wildlife Foundation research grant. N.A.G. was supported by the U.S. Department of Energy’s Office of Science, Biological and Environmental Research. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725. We are grateful for open-access-publishing funds from Kresge Library at Oakland University and Queen’s University Belfast. This research was supported by awards to S.D.T. from the Ecuadorian Ministry of Science [Secretaría de Educación Superior Ciencia, Tecnología e Innovación (SENESCYT)] through the PROMETEO scholar exchange program, the Oakland University Research Development Grant program, and a Huron Mountain Wildlife Foundation research grant. N.A.G. was supported by the U.S. Department of Energy’s Office of Science, Biological and Environmental Research. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725. We are grateful for open-access-publishing funds from Kresge Library at Oakland University and Queen’s University Belfast.

Published
2019

35. Global patterns and drivers of ecosystem functioning in rivers and riparian zones

Author

Tiegs, Scott D., Costello, David M., Isken, Mark W., Woodward, Guy, McIntyre, Peter B., Gessner, Mark O., Chauvet, Eric, Flecker, Alex S., Acuña, Vicenç, Albariño, Ricardo J., Allen, Daniel C., Alonso, Cecilia, Andino, Patricio, Arango, Clay P., Aroviita, Jukka, Barbosa, Marcus V. M., Barmuta, Leon A., Baxter, Colden V., Bell, Thomas D. C., Bellinger, Brent J., Boyero, Luz, Brown, Lee E., Bruder, Andreas, Bruesewitz, Denise A., Burdon, Francis J., Callisto, Marcos, Canhoto, Cristina, Capps, Krista A., Castillo, María M., Clapcott, Joanne, Colas, Fanny, Colón-Gaud, Checo, Cornut, Julien, Crespo-Pérez, Verónica, Cross, Wyatt F., Culp, Joseph M., Danger, Michael, Dangles, Olivier, de Eyto, Elvira, Derry, Alison M., Díaz Villanueva, Veronica, Douglas, Michael M., Elosegi, Arturo, Encalada, Andrea C., Entrekin, Sally, Espinosa, Rodrigo, Ethaiya, Diana, Ferreira, Verónica, Ferriol, Carmen, Flanagan, Kyla M., Fleituch, Tadeusz, Shah, Jennifer J. Follstad, Frainer, André, Friberg, Nikolai, Frost, Paul C., Garcia, Erica A., García Lago, Liliana, García Soto, Pavel Ernesto, Ghate, sudeep, Giling, Darren P., Gilmer, Alan, Gonçalves Jr., José Francisco, Gonzales, Rosario Karina, Graça, Manuel A. S., Grace, Mike, Grossart, Hans-Peter, Guérold, François, Gulis, Vlad, Hepp, Luiz U., Higgins, Scott, Hishi, Takuo, Huddart, Joseph, Hudson, John, Imberger, Samantha, Iñiguez-Armijos, Carlos, Iwata, Tomoya, Janetski, David J., Jennings, Eleanor, Kirkwood, Andrea E., Koning, Aaron A., Kosten, Sarian, Kuehn, Kevin A., Laudon, Hjalmar, Leavitt, Peter R., da Silva, Lemes, Leroux, Shawn J., LeRoy, Peter J. Lisi, MacKenzie, Richard, Marcarelli, Amy M., Masese, Frank O., McKie, Brendan G., Medeiros, Adriana Oliveira, Meissner, Kristian, Miliša, Marko, Mishra, Shailendra, Miyake, Yo, Moerke, Ashley, Mombrikotb, Shorok, mooney, Rob, Moulton, Tim, Muotka, Timo, Negishi, Junjiro N., Neres-Lima, Vinicius, Nieminen, Mika L., Nimptsch, Jorge, Ondruch, Jakub, Paavola, Riku, Pardo, Isabel, Patrick, Christopher J., Peeters, Edwin T.H.M., Pozo, Jesus, Pringle, Catherine, Prussian, Aaron, Quenta, Estefania, Quesada, Antonio, Reid, Brian, Richardson, John S., Rigosi, Anna, Rincón, José, Rîşnoveanu, Geta, Robinson, Christopher T., Rodríguez-Gallego, Lorena, Royer, Todd V., Rusak, James A., Santamans, Anna C., Selmeczy, Géza B., Simiyu, Gelas, Skuja, Agnija, Smykla, Jerzy, Sridar, Kandikere R., Sponseller, Ryan, Stoler, Aaron, Swan, Christopher M., Szlag, David, Teixeira-de Mello, Franco, Tonkin, Jonathan D., Uusheimo, Sari, Veach, Allison M., Vilbaste, Sirje, Vought, Lena B.M., Wang, Chiao-Ping, Webster, Jackson R., Wilson, Paul B., Woelfl, Stefan, Xenopoulos, Marguerite A., Yates, Adam G., Yoshimura, Chihiro, Yule, Catherine M., Zhang, Yixin X., and Zwart, Jacob A.

Subjects
VDP::Matematikk og naturvitenskap: 400::Zoologiske og botaniske fag: 480, VDP::Mathematics and natural scienses: 400::Zoology and botany: 480
Abstract

River ecosystems receive and process vast quantities of terrestrial organic carbon, the fate of which depends strongly on microbial activity. Variation in and controls of processing rates, however, are poorly characterized at the global scale. In response, we used a peer-sourced research network and a highly standardized carbon processing assay to conduct a global-scale field experiment in greater than 1000 river and riparian sites. We found that Earth’s biomes have distinct carbon processing signatures. Slow processing is evident across latitudes, whereas rapid rates are restricted to lower latitudes. Both the mean rate and variability decline with latitude, suggesting temperature constraints toward the poles and greater roles for other environmental drivers (e.g., nutrient loading) toward the equator. These results and data set the stage for unprecedented “next-generation biomonitoring” by establishing baselines to help quantify environmental impacts to the functioning of ecosystems at a global scale.

Published
2019

37. Global patterns and drivers of ecosystem functioning in rivers and riparian zones

Author

Entomology, Tiegs, Scott D., Costello, David M., Isken, Mark W., Woodward, Guy, McIntyre, Peter B., Gessner, Mark O., Chauvet, Eric, Griffiths, Natalie A., Flecker, Alex S., Acuna, Vicenc, Albarino, Ricardo, Allen, Daniel C., Alonso, Cecilia, Andino, Patricio, Arango, Clay, Aroviita, Jukka, Barbosa, Marcus V. M., Barmuta, Leon A., Baxter, Colden V., Bell, Thomas D. C., Bellinger, Brent, Boyero, Luz, Brown, Lee E., Bruder, Andreas, Bruesewitz, Denise A., Burdon, Francis J., Callisto, Marcos, Canhoto, Cristina, Capps, Krista A., Castillo, Maria M., Clapcott, Joanne, Colas, Fanny, Colon-Gaud, Checo, Cornut, Julien, Crespo-Perez, Veronica, Cross, Wyatt F., Culp, Joseph M., Danger, Michael, Dangles, Olivier, de Eyto, Elvira, Derry, Alison M., Diaz Villanueva, Veronica, Douglas, Michael M., Elosegi, Arturo, Encalada, Andrea C., Entrekin, Sally A., Espinosa, Rodrigo, Ethaiya, Diana, Ferreira, Veronica, Ferriol, Carmen, Flanagan, Kyla M., Fleituch, Tadeusz, Shah, Jennifer J. Follstad, Frainer, Andre, Friberg, Nikolai, Frost, Paul C., Garcia, Erica A., Lago, Liliana Garcia, Garcia Soto, Pavel Ernesto, Ghate, Sudeep, Giling, Darren P., Gilmer, Alan, Goncalves, Jose Francisco, Jr., Gonzales, Rosario Karina, Graca, Manuel A. S., Grace, Mike, Grossart, Hans-Peter, Guerold, Francois, Gulis, Vlad, Hepp, Luiz U., Higgins, Scott, Hishi, Takuo, Huddart, Joseph, Hudson, John, Imberger, Samantha, Iniguez-Armijos, Carlos, Iwata, Tomoya, Janetski, David J., Jennings, Eleanor, Kirkwood, Andrea E., Koning, Aaron A., Kosten, Sarian, Kuehn, Kevin A., Laudon, Hjalmar, Leavitt, Peter R., Lemes da Silva, Aurea L., Leroux, Shawn J., Leroy, Carri J., Lisi, Peter J., MacKenzie, Richard, Marcarelli, Amy M., Masese, Frank O., Mckie, Brendan G., Oliveira Medeiros, Adriana, Meissner, Kristian, Milisa, Marko, Mishra, Shailendra, Miyake, Yo, Moerke, Ashley, Mombrikotb, Shorok, Mooney, Rob, Moulton, Tim, Muotka, Timo, Negishi, Junjiro N., Neres-Lima, Vinicius, Nieminen, Mika L., Nimptsch, Jorge, Ondruch, Jakub, Paavola, Riku, Pardo, Isabel, Patrick, Christopher J., Peeters, Edwin T. H. M., Pozo, Jesus, Pringle, Catherine, Prussian, Aaron, Quenta, Estefania, Quesada, Antonio, Reid, Brian, Richardson, John S., Rigosi, Anna, Rincon, Jose, Risnoveanu, Geta, Robinson, Christopher T., Rodriguez-Gallego, Lorena, Royer, Todd V., Rusak, James A., Santamans, Anna C., Selmeczy, Geza B., Simiyu, Gelas, Skuja, Agnija, Smykla, Jerzy, Sridhar, Kandikere R., Sponseller, Ryan, Stoler, Aaron, Swan, Christopher M., Szlag, David, Teixeira-de Mello, Franco, Tonkin, Jonathan D., Uusheimo, Sari, Veach, Allison M., Vilbaste, Sirje, Vought, Lena B. M., Wang, Chiao-Ping, Webster, Jackson R., Wilson, Paul B., Woelfl, Stefan, Xenopoulos, Marguerite A., Yates, Adam G., Yoshimura, Chihiro, Yule, Catherine M., Zhang, Yixin X., Zwart, Jacob A., Entomology, Tiegs, Scott D., Costello, David M., Isken, Mark W., Woodward, Guy, McIntyre, Peter B., Gessner, Mark O., Chauvet, Eric, Griffiths, Natalie A., Flecker, Alex S., Acuna, Vicenc, Albarino, Ricardo, Allen, Daniel C., Alonso, Cecilia, Andino, Patricio, Arango, Clay, Aroviita, Jukka, Barbosa, Marcus V. M., Barmuta, Leon A., Baxter, Colden V., Bell, Thomas D. C., Bellinger, Brent, Boyero, Luz, Brown, Lee E., Bruder, Andreas, Bruesewitz, Denise A., Burdon, Francis J., Callisto, Marcos, Canhoto, Cristina, Capps, Krista A., Castillo, Maria M., Clapcott, Joanne, Colas, Fanny, Colon-Gaud, Checo, Cornut, Julien, Crespo-Perez, Veronica, Cross, Wyatt F., Culp, Joseph M., Danger, Michael, Dangles, Olivier, de Eyto, Elvira, Derry, Alison M., Diaz Villanueva, Veronica, Douglas, Michael M., Elosegi, Arturo, Encalada, Andrea C., Entrekin, Sally A., Espinosa, Rodrigo, Ethaiya, Diana, Ferreira, Veronica, Ferriol, Carmen, Flanagan, Kyla M., Fleituch, Tadeusz, Shah, Jennifer J. Follstad, Frainer, Andre, Friberg, Nikolai, Frost, Paul C., Garcia, Erica A., Lago, Liliana Garcia, Garcia Soto, Pavel Ernesto, Ghate, Sudeep, Giling, Darren P., Gilmer, Alan, Goncalves, Jose Francisco, Jr., Gonzales, Rosario Karina, Graca, Manuel A. S., Grace, Mike, Grossart, Hans-Peter, Guerold, Francois, Gulis, Vlad, Hepp, Luiz U., Higgins, Scott, Hishi, Takuo, Huddart, Joseph, Hudson, John, Imberger, Samantha, Iniguez-Armijos, Carlos, Iwata, Tomoya, Janetski, David J., Jennings, Eleanor, Kirkwood, Andrea E., Koning, Aaron A., Kosten, Sarian, Kuehn, Kevin A., Laudon, Hjalmar, Leavitt, Peter R., Lemes da Silva, Aurea L., Leroux, Shawn J., Leroy, Carri J., Lisi, Peter J., MacKenzie, Richard, Marcarelli, Amy M., Masese, Frank O., Mckie, Brendan G., Oliveira Medeiros, Adriana, Meissner, Kristian, Milisa, Marko, Mishra, Shailendra, Miyake, Yo, Moerke, Ashley, Mombrikotb, Shorok, Mooney, Rob, Moulton, Tim, Muotka, Timo, Negishi, Junjiro N., Neres-Lima, Vinicius, Nieminen, Mika L., Nimptsch, Jorge, Ondruch, Jakub, Paavola, Riku, Pardo, Isabel, Patrick, Christopher J., Peeters, Edwin T. H. M., Pozo, Jesus, Pringle, Catherine, Prussian, Aaron, Quenta, Estefania, Quesada, Antonio, Reid, Brian, Richardson, John S., Rigosi, Anna, Rincon, Jose, Risnoveanu, Geta, Robinson, Christopher T., Rodriguez-Gallego, Lorena, Royer, Todd V., Rusak, James A., Santamans, Anna C., Selmeczy, Geza B., Simiyu, Gelas, Skuja, Agnija, Smykla, Jerzy, Sridhar, Kandikere R., Sponseller, Ryan, Stoler, Aaron, Swan, Christopher M., Szlag, David, Teixeira-de Mello, Franco, Tonkin, Jonathan D., Uusheimo, Sari, Veach, Allison M., Vilbaste, Sirje, Vought, Lena B. M., Wang, Chiao-Ping, Webster, Jackson R., Wilson, Paul B., Woelfl, Stefan, Xenopoulos, Marguerite A., Yates, Adam G., Yoshimura, Chihiro, Yule, Catherine M., Zhang, Yixin X., and Zwart, Jacob A.

Abstract

River ecosystems receive and process vast quantities of terrestrial organic carbon, the fate of which depends strongly on microbial activity. Variation in and controls of processing rates, however, are poorly characterized at the global scale. In response, we used a peer-sourced research network and a highly standardized carbon processing assay to conduct a global-scale field experiment in greater than 1000 river and riparian sites. We found that Earth’s biomes have distinct carbon processing signatures. Slow processing is evident across latitudes, whereas rapid rates are restricted to lower latitudes. Both the mean rate and variability decline with latitude, suggesting temperature constraints toward the poles and greater roles for other environmental drivers (e.g., nutrient loading) toward the equator. These results and data set the stage for unprecedented “next-generation biomonitoring” by establishing baselines to help quantify environmental impacts to the functioning of ecosystems at a global scale.

Published
2019

40. Global patterns and drivers of ecosystem functioning in rivers and riparian zones

Author

Tiegs, Scott D., primary, Costello, David M., additional, Isken, Mark W., additional, Woodward, Guy, additional, McIntyre, Peter B., additional, Gessner, Mark O., additional, Chauvet, Eric, additional, Griffiths, Natalie A., additional, Flecker, Alex S., additional, Acuña, Vicenç, additional, Albariño, Ricardo, additional, Allen, Daniel C., additional, Alonso, Cecilia, additional, Andino, Patricio, additional, Arango, Clay, additional, Aroviita, Jukka, additional, Barbosa, Marcus V. M., additional, Barmuta, Leon A., additional, Baxter, Colden V., additional, Bell, Thomas D. C., additional, Bellinger, Brent, additional, Boyero, Luz, additional, Brown, Lee E., additional, Bruder, Andreas, additional, Bruesewitz, Denise A., additional, Burdon, Francis J., additional, Callisto, Marcos, additional, Canhoto, Cristina, additional, Capps, Krista A., additional, Castillo, María M., additional, Clapcott, Joanne, additional, Colas, Fanny, additional, Colón-Gaud, Checo, additional, Cornut, Julien, additional, Crespo-Pérez, Verónica, additional, Cross, Wyatt F., additional, Culp, Joseph M., additional, Danger, Michael, additional, Dangles, Olivier, additional, de Eyto, Elvira, additional, Derry, Alison M., additional, Villanueva, Veronica Díaz, additional, Douglas, Michael M., additional, Elosegi, Arturo, additional, Encalada, Andrea C., additional, Entrekin, Sally, additional, Espinosa, Rodrigo, additional, Ethaiya, Diana, additional, Ferreira, Verónica, additional, Ferriol, Carmen, additional, Flanagan, Kyla M., additional, Fleituch, Tadeusz, additional, Follstad Shah, Jennifer J., additional, Frainer, André, additional, Friberg, Nikolai, additional, Frost, Paul C., additional, Garcia, Erica A., additional, García Lago, Liliana, additional, García Soto, Pavel Ernesto, additional, Ghate, Sudeep, additional, Giling, Darren P., additional, Gilmer, Alan, additional, Gonçalves, José Francisco, additional, Gonzales, Rosario Karina, additional, Graça, Manuel A. S., additional, Grace, Mike, additional, Grossart, Hans-Peter, additional, Guérold, François, additional, Gulis, Vlad, additional, Hepp, Luiz U., additional, Higgins, Scott, additional, Hishi, Takuo, additional, Huddart, Joseph, additional, Hudson, John, additional, Imberger, Samantha, additional, Iñiguez-Armijos, Carlos, additional, Iwata, Tomoya, additional, Janetski, David J., additional, Jennings, Eleanor, additional, Kirkwood, Andrea E., additional, Koning, Aaron A., additional, Kosten, Sarian, additional, Kuehn, Kevin A., additional, Laudon, Hjalmar, additional, Leavitt, Peter R., additional, Lemes da Silva, Aurea L., additional, Leroux, Shawn J., additional, LeRoy, Carri J., additional, Lisi, Peter J., additional, MacKenzie, Richard, additional, Marcarelli, Amy M., additional, Masese, Frank O., additional, McKie, Brendan G., additional, Oliveira Medeiros, Adriana, additional, Meissner, Kristian, additional, Miliša, Marko, additional, Mishra, Shailendra, additional, Miyake, Yo, additional, Moerke, Ashley, additional, Mombrikotb, Shorok, additional, Mooney, Rob, additional, Moulton, Tim, additional, Muotka, Timo, additional, Negishi, Junjiro N., additional, Neres-Lima, Vinicius, additional, Nieminen, Mika L., additional, Nimptsch, Jorge, additional, Ondruch, Jakub, additional, Paavola, Riku, additional, Pardo, Isabel, additional, Patrick, Christopher J., additional, Peeters, Edwin T. H. M., additional, Pozo, Jesus, additional, Pringle, Catherine, additional, Prussian, Aaron, additional, Quenta, Estefania, additional, Quesada, Antonio, additional, Reid, Brian, additional, Richardson, John S., additional, Rigosi, Anna, additional, Rincón, José, additional, Rîşnoveanu, Geta, additional, Robinson, Christopher T., additional, Rodríguez-Gallego, Lorena, additional, Royer, Todd V., additional, Rusak, James A., additional, Santamans, Anna C., additional, Selmeczy, Géza B., additional, Simiyu, Gelas, additional, Skuja, Agnija, additional, Smykla, Jerzy, additional, Sridhar, Kandikere R., additional, Sponseller, Ryan, additional, Stoler, Aaron, additional, Swan, Christopher M., additional, Szlag, David, additional, Teixeira-de Mello, Franco, additional, Tonkin, Jonathan D., additional, Uusheimo, Sari, additional, Veach, Allison M., additional, Vilbaste, Sirje, additional, Vought, Lena B. M., additional, Wang, Chiao-Ping, additional, Webster, Jackson R., additional, Wilson, Paul B., additional, Woelfl, Stefan, additional, Xenopoulos, Marguerite A., additional, Yates, Adam G., additional, Yoshimura, Chihiro, additional, Yule, Catherine M., additional, Zhang, Yixin X., additional, and Zwart, Jacob A., additional

Published
2019
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42. Identifying climate and seiche influences on phosphorus loadings in coastal wetlands on Lake Ontario.

Author

Harrow-Lyle, Tyler J., Chomicki, Krista M., and Kirkwood, Andrea E.

Subjects
PHOSPHORUS in water, COASTAL wetlands
Abstract

Great Lakes coastal wetlands are essential land-water linkages, which regulate the fate of materials and nutrients from watersheds prior to discharge into the nearshore zone of the Great Lakes. With climate change increasing storm activity and wind events within the Great Lakes Basin, a fulsome understanding of nutrient processing and fate within coastal wetlands is essential. We evaluated across- and -- within wetland water quality and nutrient loadings as a function of climate and seiche activity over a decade (2009-2018) in three drowned river mouthed wetlands of Lake Ontario. Notably, celled sites had significantly higher concentrations of total phosphorus, phosphate, and organic nitrogen compared to non-celled sites (permutational analysis of variance p-value < 0.001). These differences were associated with increased solar radiation and lake level variability (i.e., seiche inundation), thus we infer celled sites are important locations for the mobilization of legacy phosphorus. To further characterize the relative effect seiche activity has on phosphorus loadings to the nearshore zone of Lake Ontario, we developed a structural equation model. We confirmed that seiche events resuspend sediments, which cause a significant increase of phosphorus loadings to the coastal zone of Lake Ontario (p-value < 0.001). Our results indicate that climate and seiche events influence coastal wetland water quality and should be considered when assessing nearshore zone water quality. [ABSTRACT FROM AUTHOR]

Published
2023

47. The role of stormwater management ponds in regulating chloride fate in urban sewersheds.

Author

Horton, Kaitlyn and Kirkwood, Andrea E.

Subjects
URBAN runoff management, CHLORIDES
Abstract

Stormwater Management Ponds (SWMPs) are important in flood management and sedimentation of stormwater debris prior to discharge into receiving waters. Chloride is a common contaminant in urban stormwater due to the broad-scale application of chloride-laden deicers in temperate regions. As part of a larger study investigating the regulation of water quality by SWMPs, we measured chloride concentrations at the inflow, permanent pool, and outflow locations of 12 SWMPs varying in age and size in Oshawa, Ontario from June - September, 2022. Our results showed persistently high chloride concentrations over the course of the study period, where median inflowing chloride levels were higher than outflowing levels, but there was a high degree of variability. In particular, we found that chloride decreased following storm events, which potentially indicates a dilution effect. The high chloride concentrations being discharged are of concern because they exceed the current water quality guidelines for aquatic organisms. Most interesting was that the lowest chloride concentrations were typically found in the permanent-pool locations. Overall, these results show that SWMPs mediate chloride concentrations prior to discharge, and thus play a role in chloride fate and dynamics in urban areas. [ABSTRACT FROM AUTHOR]

Published
2023

48. Investigating the role of anoxia in the nutrient dynamics of four Lake Ontario coastal wetlands.

Author

DellAquila, Michele, Chomicki, Krista M., Parsons, Chris T., and Kirkwood, Andrea E.

Subjects
COASTAL wetlands
Abstract

Although Great Lakes coastal wetlands are considered "keystone" ecosystems, surprisingly little is known about their dynamic role in regulating nutrient loadings to receiving waters. Based on over a decade of spatially explicit monitoring, the Toronto and Region Conservation Authority determined that four coastal wetlands (Rouge Marsh, Duffin's Marsh, Carruthers Marsh, and Frenchman's Bay) vary in their capacity to be net-sinks or net-sources of phosphorus to Lake Ontario. To improve our understanding of phosphorus fate and dynamics in these coastal wetlands, we deployed continuous (every 30 min) multiparameter (dissolved oxygen, conductivity, turbidity, pH) sondes just above the sediment surface in each study wetland for eight weeks (Aug. - October) in 2022. A suite of phosphorus and nitrogen samples were collected weekly with other water quality variables. We will present these findings with an emphasis on the role of dissolved oxygen and nitrate concentrations in mediating internal phosphorus loading. [ABSTRACT FROM AUTHOR]

Published
2023

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