17 results on '"MASSAFERRO, Julieta"'
Search Results
2. Impact of human activities and climate on Lake Morenito, Northern Patagonia, Argentina
- Author
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Mauad, Melina, Mayr, Christoph, Graßl, Teresa, Dubois, Nathalie, Serra, Maria Noel, and Massaferro, Julieta
- Published
- 2020
- Full Text
- View/download PDF
3. Climate and site-specific factors shape chironomid taxonomic and functional diversity patterns in northern Patagonia
- Author
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Motta, Luciana and Massaferro, Julieta
- Published
- 2019
- Full Text
- View/download PDF
4. A multiproxy approach to reconstruct the Late Holocene environmental dynamics of the semiarid Andes of central Chile (29°S).
- Author
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Martel-Cea, Alejandra, Maldonado, Antonio, de Porras, Maria Eugenia, Munoz, Praxedes, Maidana, Nora I., Massaferro, Julieta, Schittek, Karsten, Mills, Keely, Michelutti, Neal, and Minckley, Thomas A.
- Subjects
MOUNTAIN ecology ,HOLOCENE Epoch ,SNOW cover ,FOSSIL diatoms ,ECOLOGICAL forecasting ,WATERSHEDS - Abstract
Mountain ecosystems located in the Andes cordillera of central Chile (29-35°S) have been strongly affected by the ongoing Mega Drought since 2010, impacting the snow cover, the surficial water resources (and thereby water storage), as well as the mountain biota and ecosystem services. Paleoenvironmental records in this part of the semiarid Andes are key to estimating the effects of past climate changes on local communities helping to forecast the ecological and biological responses under the aridification trend projected during the 21[sup st] century. Here we present a 2400-year multiproxy paleoenvironmental reconstruction based on pollen, diatoms, chironomids, sedimentological and geochemical data (XRF and ICP-MS data) of Laguna El Calvario (29°S; 3994 m a.s.l), a small and shallow Andean lake. Four main hydrological phases were established based on changes in the lithogenic and geochemical results associated with allochthonous runoff input and the subsequent response of the biological proxies. Between 2400 and 1400 cal yrs BP, wetter than present conditions occurred based on the intense weathering of the lake basin and the dominance of upper Andean vegetation. A decrease in moisture along with sub-centennial discrete wet pulses and lake-level changes occurred until ~800 cal yrs BP followed long-term stable climate conditions between 1850 and 1950 AD as suggested by a drop in vegetation productivity and low lake levels. From 1950 AD to the present, a decline in moisture with a severe trend to drier conditions occurring in the last decades occurred as reflected by an upward vegetation belt displacement around Laguna El Calvario along with a turnover of diatom assemblages and high productivity in the water column. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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5. A global database of Holocene paleotemperature records
- Author
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Kaufman, Darrell, McKay, Nicholas, Routson, Cody, Erb, Michael, Davis, Basil, Heiri, Oliver, Jaccard, Samuel, Tierney, Jessica, Dätwyler, Christoph, Axford, Yarrow, Brussel, Thomas, Cartapanis, Olivier, Chase, Brian, Dawson, Andria, de Vernal, Anne, Engels, Stefan, Jonkers, Lukas, Marsicek, Jeremiah, Moffa-Sánchez, Paola, Morrill, Carrie, Orsi, Anais, Rehfeld, Kira, Saunders, Krystyna, Sommer, Philipp S., Thomas, Elizabeth, Tonello, Marcela, Tóth, Mónika, Vachula, Richard, Andreev, Andrei, Bertrand, Sebastien, Biskaborn, Boris, Bringué, Manuel, Brooks, Stephen, Caniupán, Magaly, Chevalier, Manuel, Cwynar, Les, Emile-Geay, Julien, Fegyveresi, John, Feurdean, Angelica, Finsinger, Walter, Fortin, Marie-Claude, Foster, Louise, Fox, Mathew, Gajewski, Konrad, Grosjean, Martin, Hausmann, Sonja, Heinrichs, Markus, Holmes, Naomi, Ilyashuk, Boris, Ilyashuk, Elena, Juggins, Steve, Khider, Deborah, Koinig, Karin, Langdon, Peter, Larocque-Tobler, Isabelle, Li, Jianyong, Lotter, André, Luoto, Tomi, Mackay, Anson, Magyari, Eniko, Malevich, Steven, Mark, Bryan, Massaferro, Julieta, Montade, Vincent, Nazarova, Larisa, Novenko, Elena, Pařil, Petr, Pearson, Emma, Peros, Matthew, Pienitz, Reinhard, Płóciennik, Mateusz, Porinchu, David, Potito, Aaron, Rees, Andrew, Reinemann, Scott, Roberts, Stephen, Rolland, Nicolas, Salonen, Sakari, Self, Angela, Seppä, Heikki, Shala, Shyhrete, St-Jacques, Jeannine-Marie, Stenni, Barbara, Syrykh, Liudmila, Tarrats, Pol, Taylor, Karen, van den Bos, Valerie, Velle, Gaute, Wahl, Eugene, Walker, Ian, Wilmshurst, Janet, Zhang, Enlou, and Zhilich, Snezhana
- Published
- 2020
- Full Text
- View/download PDF
6. Publisher Correction: A global database of Holocene paleotemperature records
- Author
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Kaufman, Darrell, McKay, Nicholas, Routson, Cody, Erb, Michael, Davis, Basil, Heiri, Oliver, Jaccard, Samuel, Tierney, Jessica, Dätwyler, Christoph, Axford, Yarrow, Brussel, Thomas, Cartapanis, Olivier, Chase, Brian, Dawson, Andria, de Vernal, Anne, Engels, Stefan, Jonkers, Lukas, Marsicek, Jeremiah, Moffa-Sánchez, Paola, Morrill, Carrie, Orsi, Anais, Rehfeld, Kira, Saunders, Krystyna, Sommer, Philipp S., Thomas, Elizabeth, Tonello, Marcela, Tóth, Mónika, Vachula, Richard, Andreev, Andrei, Bertrand, Sebastien, Biskaborn, Boris, Bringué, Manuel, Brooks, Stephen, Caniupán, Magaly, Chevalier, Manuel, Cwynar, Les, Emile-Geay, Julien, Fegyveresi, John, Feurdean, Angelica, Finsinger, Walter, Fortin, Marie-Claude, Foster, Louise, Fox, Mathew, Gajewski, Konrad, Grosjean, Martin, Hausmann, Sonja, Heinrichs, Markus, Holmes, Naomi, Ilyashuk, Boris, Ilyashuk, Elena, Juggins, Steve, Khider, Deborah, Koinig, Karin, Langdon, Peter, Larocque-Tobler, Isabelle, Li, Jianyong, Lotter, André, Luoto, Tomi, Mackay, Anson, Magyari, Eniko, Malevich, Steven, Mark, Bryan, Massaferro, Julieta, Montade, Vincent, Nazarova, Larisa, Novenko, Elena, Pařil, Petr, Pearson, Emma, Peros, Matthew, Pienitz, Reinhard, Płóciennik, Mateusz, Porinchu, David, Potito, Aaron, Rees, Andrew, Reinemann, Scott, Roberts, Stephen, Rolland, Nicolas, Salonen, Sakari, Self, Angela, Seppä, Heikki, Shala, Shyhrete, St-Jacques, Jeannine-Marie, Stenni, Barbara, Syrykh, Liudmila, Tarrats, Pol, Taylor, Karen, van den Bos, Valerie, Velle, Gaute, Wahl, Eugene, Walker, Ian, Wilmshurst, Janet, Zhang, Enlou, and Zhilich, Snezhana
- Published
- 2020
- Full Text
- View/download PDF
7. Author Correction: A global database of Holocene paleotemperature records
- Author
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Kaufman, Darrell, McKay, Nicholas, Routson, Cody, Erb, Michael, Davis, Basil, Heiri, Oliver, Jaccard, Samuel, Tierney, Jessica, Dätwyler, Christoph, Axford, Yarrow, Brussel, Thomas, Cartapanis, Olivier, Chase, Brian, Dawson, Andria, de Vernal, Anne, Engels, Stefan, Jonkers, Lukas, Marsicek, Jeremiah, Moffa-Sánchez, Paola, Morrill, Carrie, Orsi, Anais, Rehfeld, Kira, Saunders, Krystyna, Sommer, Philipp S., Thomas, Elizabeth, Tonello, Marcela, Tóth, Mónika, Vachula, Richard, Andreev, Andrei, Bertrand, Sebastien, Biskaborn, Boris, Bringué, Manuel, Brooks, Stephen, Caniupán, Magaly, Chevalier, Manuel, Cwynar, Les, Emile-Geay, Julien, Fegyveresi, John, Feurdean, Angelica, Finsinger, Walter, Fortin, Marie-Claude, Foster, Louise, Fox, Mathew, Gajewski, Konrad, Grosjean, Martin, Hausmann, Sonja, Heinrichs, Markus, Holmes, Naomi, Ilyashuk, Boris, Ilyashuk, Elena, Juggins, Steve, Khider, Deborah, Koinig, Karin, Langdon, Peter, Larocque-Tobler, Isabelle, Li, Jianyong, Lotter, André, Luoto, Tomi, Mackay, Anson, Magyari, Eniko, Malevich, Steven, Mark, Bryan, Massaferro, Julieta, Montade, Vincent, Nazarova, Larisa, Novenko, Elena, Pařil, Petr, Pearson, Emma, Peros, Matthew, Pienitz, Reinhard, Płóciennik, Mateusz, Porinchu, David, Potito, Aaron, Rees, Andrew, Reinemann, Scott, Roberts, Stephen, Rolland, Nicolas, Salonen, Sakari, Self, Angela, Seppä, Heikki, Shala, Shyhrete, St-Jacques, Jeannine-Marie, Stenni, Barbara, Syrykh, Liudmila, Tarrats, Pol, Taylor, Karen, van den Bos, Valerie, Velle, Gaute, Wahl, Eugene, Walker, Ian, Wilmshurst, Janet, Zhang, Enlou, and Zhilich, Snezhana
- Published
- 2020
- Full Text
- View/download PDF
8. Contrasting responses of lake ecosystems to environmental disturbance: a paleoecological perspective from northern Patagonia (Argentina)
- Author
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Massaferro, Julieta, Correa-Metrio, Alex, Montes de Oca, Fernanda, and Mauad, Melina
- Published
- 2018
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9. A 2200-year record of Andean Condor diet and nest site usage reflects natural and anthropogenic stressors.
- Author
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Duda, Matthew P., Grooms, Christopher, Sympson, Lorenzo, Blais, Jules M., Dagodzo, Daniel, Feng, Wenxi, Hayward, Kristen M., Julius, Matthew L., Kimpe, Linda E., Lambertucci, Sergio A., Layton-Matthews, Daniel, Lougheed, Stephen C., Massaferro, Julieta, Michelutti, Neal, Pufahl, Peir K., Vuletich, April, and Smol, John P.
- Subjects
RED deer ,DIET ,MARINE animals ,ANIMAL carcasses ,HERBIVORES ,EARTHWORMS ,CONDORS - Abstract
Understanding how animals respond to large-scale environmental changes is difficult to achieve because monitoring data are rarely available for more than the past few decades, if at all. Here, we demonstrate how a variety of palaeoecological proxies (e.g. isotopes, geochemistry and DNA) from an Andean Condor (Vultur gryphus) guano deposit from Argentina can be used to explore breeding site fidelity and the impacts of environmental changes on avian behaviour. We found that condors used the nesting site since at least approximately 2200 years ago, with an approximately 1000-year nesting frequency slowdown from ca 1650 to 650 years before the present (yr BP). We provide evidence that the nesting slowdown coincided with a period of increased volcanic activity in the nearby Southern Volcanic Zone, which resulted in decreased availability of carrion and deterred scavenging birds. After returning to the nest site ca 650 yr BP, condor diet shifted from the carrion of native species and beached marine animals to the carrion of livestock (e.g. sheep and cattle) and exotic herbivores (e.g. red deer and European hare) introduced by European settlers. Currently, Andean Condors have elevated lead concentrations in their guano compared to the past, which is associated with human persecution linked to the shift in diet. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
10. Searching for the Little Ice Age in the last ~900 yrs record of the shallow lake Laguna Polo, Patagonia, Argentina
- Author
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Charqueño-Celis, Fernanda, Mayr, Christoph, Perez, Liseth, Dubois, Nathalie, Massaferro, Julieta, Hassan, Gabriela S., de Porras, M. Eugenia, Halac, Silvana R., and Córdoba, Francisco E.
- Abstract
The records of the Little Ice Age (LIA) in lacustrine sediments from southern south America (SSA) are still rare. Indeed, most of the evidence of this period in SSA comes from tree rings records. Our main goal was identifying the signal of the LIA at Laguna Polo (49° 15’ 59.4” S, 72° 53’ 38.4” W), in Santa Cruz, southern part of Patagonia. For this multiproxy reconstruction, we analyzed a 54-cm long sediment core and conducted paleoecological analysis on testate amoebae and chironomids in combination with grain-size distribution and geochemical composition (TOC, TIC, TN, biogenic silica (BiSi), δ15N, δ13C and C/N). The age model, based on radiocarbon dates and tephrochronology, indicated a basal age of ca. AD 1300. Based on the biological proxies, we divided our record into 4 zones. In zone 3 an important ecological change in both bioproxies was detected for the period AD 1420 to 1780. On the one hand, testate amoebae show an increase in abundance but a decrease in diversity. Difflugids were highly abundant and were dominated by Difflugia glans. Chironomid assemblages, on the other hand, reveal a decrease in abundance of head capsules but an increase in diversity with the appearance of Cricotopus and Dicrotendipes. The taxa of both taxonomic groups found during this period have been reported as indicators of cold environments. Grain-size analyses indicate a concurrent proportional increase in silts and clays, whereas geochemical analyses record a decrease in TN, TOC, TIC, BiSi, δ13C and the C/N ratio, but an increase of δ15N which may be indicative of a cooler and wetter period, as has been previously described during the LIA period in Patagonia., IAL-IPA 2022 Abstract Book - Lagos Memorias del Territorio
- Published
- 2022
- Full Text
- View/download PDF
11. Testate amoebae (Amoebozoa: Arcellinidae) as indicators of dissolved oxygen concentration and water depth in lakes of the Lacandón Forest, southern Mexico
- Author
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Charqueño Celis, Norma Fernanda, Garibay, Martin, Sigala, Itzel, Brenner, Mark, Echeverria Galindo, Paula, Lozano García, Socorro, Massaferro, Julieta, and Pérez, Liseth
- Subjects
LACANDÓN FOREST ,NEOTROPICS ,Testate amoebae -- neotropics -- bioindicators -- dissolved oxygen -- water depth -- Lacandón Forest ,Article ,BIOINDICATORS ,purl.org/becyt/ford/1 [https] ,purl.org/becyt/ford/1.5 [https] ,neotropics ,water depth ,Veröffentlichung der TU Braunschweig ,lcsh:Physical geography ,lcsh:Environmental sciences ,ddc:5 ,Lacandón Forest ,lcsh:GE1-350 ,WATER DEPTH ,lcsh:Geography. Anthropology. Recreation ,TESTATE AMOEBAE ,DISSOLVED OXYGEN ,lcsh:G ,dissolved oxygen ,bioindicators ,ddc:55 ,Publikationsfonds der TU Braunschweig ,Testate amoebae ,lcsh:GB3-5030 - Abstract
The ecology of aquatic protists such as testate amoebae is poorly known worldwide, but is almost completely unknown in lakes of the northern Neotropics. To address this knowledge gap, we analyzed testate amoebae (Amoebozoa: Arcellinidae) in lakes of the Lacandón Forest, one of the most biodiverse parts of southern México. We set out to evaluate the diversity of testate amoebae communities and assess whether testate amoebae taxa are reliable indicators of environmental variables dissolved oxygen and water depth. We collected 17 surface sediment samples from a range of water depths in six lakes across the Naha-Metzabok Biosphere Reserve, northeastern Chiapas state. We identified 15 testate amoebae taxa distributed across seven genera. Eleven were identified to species level and four to strain (infra-subspecific level), and taxa were distributed unevenly among samples. Distribution of taxa in samples was related to dissolved oxygen (DO) concentration in the water measured near the sediment surface. Arcella discoides and Centropyxis aculeata strain “aculeata” were the most tolerant of low oxygen concentrations, whereas the other taxa require higher DO levels. The influence of oxygen was also seen at the assemblage level. Sites with low DO concentrations had Shannon Diversity Index (SDI) values
- Published
- 2019
12. Sub-fossil chironomids as indicators of hydrological changes in the shallow and high-altitude lake Shen Co, Tibetan Plateau, over the past two centuries.
- Author
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Rigterink, Sonja, Echeverría-Galindo, Paula, Martínez-Abarca, Rodrigo, Massaferro, Julieta, Hoelzmann, Philipp, Wünnemann, Bernd, Laug, Andreas, Pérez, Liseth, Wengang Kang, Börner, Nicole, Schwarz, Anja, Ping Peng, Junbo Wang, Liping Zhu, and Schwalb, Antje
- Subjects
GLOBAL warming ,TIBETANS ,LAKES ,ENDORHEIC lakes ,CLIMATE change - Abstract
Understanding climate and monsoonal dynamics on the Tibetan Plateau is crucial, as recent hydrological changes, evidenced by rising lake levels, will be accelerated by current global warming and may alter aquatic habitats and species inventories. This study combines chironomid assemblages with sedimentological, mineralogical and geochemical data of a short sediment core (37.5 cm) from the highaltitude (>4,733 m asl), saline (9 g L-1) and shallow (~5 m water depth) Shen Co, located in the southern part of the central Tibetan Plateau. The predominantly littoral, species-poor (10 chironomid morphotypes) chironomid assemblages are dominated by salt-tolerant taxa, that are highly sensitive to lake level fluctuations and macrophyte vegetation dynamics, making them ideally suited for tracking lake level changes over time. Results indicate a period (from ca. 1830 to 1921 CE) of drier conditions with low runoff and high evaporation rates in the Shen Co catchment, as indicated by a dominance of low-Mg calcite and dolomite and increased Ca/Fe and Sr/Rb ratios. This resulted in a decline in lake levels, an increase in salinity and the periodic occurrence of desiccation events at the sampling site. The first chironomid morphotype to appear after the dry period is Acricotopus indet. morphotype incurvatus, which indicate still low (<2 m) but rising lake levels after 1921 CE due to increasing runoff and a lower evaporation/precipitation ratio, as reflected by coarser grain size, higher quartz content and increased TN, TOC and Al/Si ratios. A replacement of A. indet. morphotype incurvatus by Procladius is observed as lake level rise continued after 1950 CE. The highest lake level is proposed for the period since 2006 CE. From 1955 to 1960 CE and from 2011 to 2018 CE, the presence of the phytophilic taxon Psectrocladius sordidellus-type supported abundant macrophyte growth. These changes are consistent with climate reconstructions from the northern and central Tibetan Plateau, indicating warmer and wetter climate conditions since the beginning of the 20th century, which have led to an increase in lake level in a number of Tibetan lakes. Our study specifically highlights 1920 and 1950 as years with enhanced precipitation. This can be attributed to strong overlapping multidecadal cycles of Westerlies and monsoon systems. This study demonstrates the significance of studying small, shallow lakes, as they frequently contain aquatic communities that respond more rapidly to the changes in the lake system. In addition, this study expands our understanding of the ecology of Tibetan chironomid morphotypes, highlighting this group's potential as paleolimnological proxies for investigating past environmental and climatic changes. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
13. Deciphering long-term records of natural variability and human impact as recorded in lake sediments: a palaeolimnological puzzle
- Author
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Mills, Keely, Schillereff, Daniel, Gell, Peter, Anderson, N. John, Arnaud, Fabien, Dong, Xuhui, Jones, Matthew, McGowan, Suzanne, Massaferro, Julieta, Moorhouse, Heather, Perez, Liseth, and Ryves, David B.
- Abstract
Global aquatic ecosystems are under increasing threat from anthropogenic activity, as well as being exposed to past (and projected) climate change, however, the nature of how climate and human impacts are recorded in lake sediments is often ambiguous. Natural and anthropogenic drivers can force a similar response in lake systems, yet the ability to attribute what change recorded in lake sediments is natural, from that which is anthropogenic, is increasingly important for understanding how lake systems have, and will continue to function when subjected to multiple stressors; an issue that is particularly acute when considering management options for aquatic ecosystems. The duration and timing of human impacts on lake systems varies geographically, with some regions of the world (such as Africa and South America) having a longer legacy of human impact than others(e.g. New Zealand). A wide array of techniques (biological, chemical, physical and statistical) is available to palaeolimnologists to allow the deciphering of complex sedimentary records. Lake sediments are an important archive of how drivers have changed through time, and how these impacts manifest in lake systems. With a paucity of ‘real‐time’ data pre‐dating human impact, palaeolimnological archives offer the only insight into both natural variability (i.e. that driven by climate and intrinsic lake processes) and the impact of people. Whilst there is a need to acknowledge complexity, and temporal and spatial variability when deciphering change from sediment archives, a palaeolimnological approach is a powerful tool for better understanding and managing global aquatic resources.
- Published
- 2017
14. Testate amoebae (Amoebozoa: Arcellinidae) as indicators of dissolved oxygen concentration and water depth in lakes of the Lacandón Forest, southern Mexico.
- Author
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Fernanda Charqueño-Celis, Norma, Garibay, Martin, Sigala, Itzel, Brenner, Mark, Echeverria-Galindo, Paula, Lozano-García, Socorro, Massaferro, Julieta, and Pérez, Liseth
- Subjects
DISSOLVED oxygen in water ,WATER depth ,OXYGEN detectors ,AMOEBA ,LAKES ,ENVIRONMENTAL indicators - Abstract
The ecology of aquatic protists such as testate amoebae is poorly known worldwide, but is almost completely unknown in lakes of the northern Neotropics. To address this knowledge gap, we analyzed testate amoebae (Amoebozoa: Arcellinidae) in lakes of the Lacandón Forest, one of the most biodiverse parts of southern México. We set out to evaluate the diversity of testate amoebae communities and assess whether testate amoebae taxa are reliable indicators of environmental variables dissolved oxygen and water depth. We collected 17 surface sediment samples from a range of water depths in six lakes across the Naha-Metzabok Biosphere Reserve, northeastern Chiapas state. We identified 15 testate amoebae taxa distributed across seven genera. Eleven were identified to species level and four to strain (infra-subspecific level), and taxa were distributed unevenly among samples. Distribution of taxa in samples was related to dissolved oxygen (DO) concentration in the water measured near the sediment surface. Arcella discoides and Centropyxis aculeata strain "aculeata" were the most tolerant of low oxygen concentrations, whereas the other taxa require higher DO levels. The influence of oxygen was also seen at the assemblage level. Sites with low DO concentrations had Shannon Diversity Index (SDI) values <1.5, an indication of stressful ambient conditions. We identified two species assemblage types, which are distinguished by their oxygen concentration requirements. Assemblage 1 was more diverse and possessed species that are intolerant of low oxygen concentrations, whereas Assemblage 2 possessed fewer, rarer, opportunistic species that tolerate stressful conditions. Low oxygen concentrations are related to water depth and the combination of these two variables is important in determining the composition of testate amoebae assemblages in Lacandón Forest lakes. Quantitative relationships between testate amoebae assemblages and water depth will enable use of sedimented amoebae remains for paleolimnological inference of past water level changes in lakes of the Lacandón Forest. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
15. Assessing the performance of macroinvertebrate metrics in the Challhuaco-Ñireco System (Northern Patagonia, Argentina).
- Author
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Mauad, Melina, Miserendino, M. Laura, Risso, Miguel A., and Massaferro, Julieta
- Abstract
Copyright of Iheringia. Série Zoologia is the property of Fundacao Zoobotanica do Rio Grande do Sul and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2015
- Full Text
- View/download PDF
16. Apedilum griseistriatum comb. nov., placement of Chironomus (Polypedilum) griseistriatum (Diptera, Chironomidae).
- Author
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Donato, Mariano, Siri, Augusto, Massaferro, Julieta, and Brooks, Stephen J.
- Subjects
CHIRONOMUS ,CHIRONOMIDAE ,ANIMAL coloration ,PUPAE - Abstract
The article discusses a study which focuses on the transfer of Chironomus (Polypedilum) griseistriatum, a type of material from Patagonia to Apedilum specie. Topics include comparing the morphotypes of Apedilum with the specimens found in northern Patagonia, information on the coloration of cephalothorax and generic description of setation, and the challenge in diagnosing the pupa of Apedilum.
- Published
- 2015
- Full Text
- View/download PDF
17. A 2200-year record of Andean Condor diet and nest site usage reflects natural and anthropogenic stressors.
- Author
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Duda MP, Grooms C, Sympson L, Blais JM, Dagodzo D, Feng W, Hayward KM, Julius ML, Kimpe LE, Lambertucci SA, Layton-Matthews D, Lougheed SC, Massaferro J, Michelutti N, Pufahl PK, Vuletich A, and Smol JP
- Subjects
- Humans, Animals, Cattle, Sheep, Anthropogenic Effects, Birds, Diet, Deer, Falconiformes
- Abstract
Understanding how animals respond to large-scale environmental changes is difficult to achieve because monitoring data are rarely available for more than the past few decades, if at all. Here, we demonstrate how a variety of palaeoecological proxies (e.g. isotopes, geochemistry and DNA) from an Andean Condor ( Vultur gryphus ) guano deposit from Argentina can be used to explore breeding site fidelity and the impacts of environmental changes on avian behaviour. We found that condors used the nesting site since at least approximately 2200 years ago, with an approximately 1000-year nesting frequency slowdown from ca 1650 to 650 years before the present (yr BP). We provide evidence that the nesting slowdown coincided with a period of increased volcanic activity in the nearby Southern Volcanic Zone, which resulted in decreased availability of carrion and deterred scavenging birds. After returning to the nest site ca 650 yr BP, condor diet shifted from the carrion of native species and beached marine animals to the carrion of livestock (e.g. sheep and cattle) and exotic herbivores (e.g. red deer and European hare) introduced by European settlers. Currently, Andean Condors have elevated lead concentrations in their guano compared to the past, which is associated with human persecution linked to the shift in diet.
- Published
- 2023
- Full Text
- View/download PDF
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