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1. A functional definition to distinguish ponds from lakes and wetlands

Author

Richardson, David C, Holgerson, Meredith A, Farragher, Matthew J, Hoffman, Kathryn K, King, Katelyn BS, Alfonso, María B, Andersen, Mikkel R, Cheruveil, Kendra Spence, Coleman, Kristen A, Farruggia, Mary Jade, Fernandez, Rocio Luz, Hondula, Kelly L, López Moreira Mazacotte, Gregorio A, Paul, Katherine, Peierls, Benjamin L, Rabaey, Joseph S, Sadro, Steven, Sánchez, María Laura, Smyth, Robyn L, and Sweetman, Jon N

Subjects
Environmental Sciences, Biological Sciences, Ecology, Environmental Management, Ecosystem, Lakes, Ponds, Water, Wetlands
Abstract

Ponds are often identified by their small size and shallow depths, but the lack of a universal evidence-based definition hampers science and weakens legal protection. Here, we compile existing pond definitions, compare ecosystem metrics (e.g., metabolism, nutrient concentrations, and gas fluxes) among ponds, wetlands, and lakes, and propose an evidence-based pond definition. Compiled definitions often mentioned surface area and depth, but were largely qualitative and variable. Government legislation rarely defined ponds, despite commonly using the term. Ponds, as defined in published studies, varied in origin and hydroperiod and were often distinct from lakes and wetlands in water chemistry. We also compared how ecosystem metrics related to three variables often seen in waterbody definitions: waterbody size, maximum depth, and emergent vegetation cover. Most ecosystem metrics (e.g., water chemistry, gas fluxes, and metabolism) exhibited nonlinear relationships with these variables, with average threshold changes at 3.7 ± 1.8 ha (median: 1.5 ha) in surface area, 5.8 ± 2.5 m (median: 5.2 m) in depth, and 13.4 ± 6.3% (median: 8.2%) emergent vegetation cover. We use this evidence and prior definitions to define ponds as waterbodies that are small (

Published
2022

2. Freshwater Biogeochemical Hotspots: High Primary Production and Ecosystem Respiration in Shallow Waterbodies.

Author

Rabaey, Joseph S., Holgerson, Meredith A., Richardson, David C., Andersen, Mikkel R., Bansal, Sheel, Bortolotti, Lauren E., Cotner, James B., Hornbach, Daniel J., Martinsen, Kenneth T., Moody, Eric K., and Schloegel, Olivia F.

Subjects
LAKES, ECOSYSTEM dynamics, BODIES of water, CARBON cycle, ECOLOGICAL disturbances
Abstract

Ponds, wetlands, and shallow lakes (collectively "shallow waterbodies") are among the most biogeochemically active freshwater ecosystems. Measurements of gross primary production (GPP), respiration (R), and net ecosystem production (NEP) are rare in shallow waterbodies compared to larger and deeper lakes, which can bias our understanding of lentic ecosystem processes. In this study, we calculated GPP, R, and NEP in 26 small, shallow waterbodies across temperate North America and Europe. We observed high rates of GPP (mean 8.4 g O2 m−3 d−1) and R (mean −9.1 g O2 m−3 d−1), while NEP varied from net heterotrophic to autotrophic. Metabolism rates were affected by depth and aquatic vegetation cover, and the shallowest waterbodies had the highest GPP, R, and the most variable NEP. The shallow waterbodies from this study had considerably higher metabolism rates compared to deeper lakes, stressing the importance of these systems as highly productive biogeochemical hotspots. Plain Language Summary: Ecosystem metabolism is an important metric for understanding how an ecosystem uses and transforms energy and materials. In aquatic ecosystems, ecosystem metabolism is most often calculated by measuring oxygen. Oxygen is produced by aquatic plants and algae through photosynthesis, and oxygen is consumed by bacteria and other organisms through aerobic respiration. Oxygen production and consumption (metabolism) indicate how organic matter is flowing through the ecosystem, and whether an aquatic system is predominantly respiring (indicating it is a carbon source), or photosynthesizing (indicating it is a carbon sink). Metabolism rates in freshwater lakes scale with surface area and depth, but there are few metabolism rates calculated from oxygen measurements in shallow waterbodies. Ponds, wetlands, and shallow lakes are the most abundant freshwater systems on Earth and may function differently from larger lakes. In this study, we show that shallow systems are incredibly productive, with some of the highest rates of metabolism among aquatic ecosystems, and that depth is one of the most important factors affecting metabolism rates. Key Points: Shallow and small waterbodies have high but variable rates of gross primary production and respirationDepth plays a large role in metabolism ratesShallow waterbodies are some of the most productive freshwater ecosystems, with implications for carbon cycling and ecosystem dynamics [ABSTRACT FROM AUTHOR]

Published
2024
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5. Peripheral nerve-blocks and associations with length of stay and readmissions in fast-track total hip and knee arthroplasty

Author

Jørgensen, Christoffer C, Petersen, Pelle B, Daugberg, Louise O, Jakobsen, Thomas, Gromov, Kirill, Varnum, Claus, Andersen, Mikkel R, Palm, Henrik, Kehlet, Henrik, Jørgensen, Christoffer C, Petersen, Pelle B, Daugberg, Louise O, Jakobsen, Thomas, Gromov, Kirill, Varnum, Claus, Andersen, Mikkel R, Palm, Henrik, and Kehlet, Henrik

Abstract

BACKGROUND: Peripheral nerve blocks (PNB) have recently been recommended in total hip (THA) and knee (TKA) arthroplasty as they may reduce pain, morphine consumption, length of stay (LOS) and complications. However, whether PNBs are associated with early discharge within an enhanced recovery protocol including multimodal analgesia is uncertain.METHODS: An observational multicenter study from January to August 2017 in six Danish Arthroplasty Centers with established fast-track protocols. Prospective recording of preoperative characteristics and information on PNB, LOS and readmissions through the Danish National Patient Registry and medical records. Multiple logistic regression was used to investigate associations between PNB and a LOS >1 day, LOS >4 days, and 30-days readmissions. We also reported on mobilization, pain, opioid and fall-related complications leading to LOS >4 days or readmissions.RESULTS: A total of 2027 (58.6%) THA and 1432 (41.4%) TKAs with a median LOS of 1 day (IQR 1-2) and 5.3% (CI:4.6-6.1) 30-days readmission rate were identified. PNB was used in 40.7% (CI:38.2-43.3) of TKA and 2.7% (CI:2.0-3.5) of THA, but with considerable interdepartmental variation (0.0-89.0% for TKA). There was no association between PNB and LOS >1 day (OR:1.19 CI:0.82-1.72; p = .354), LOS >4 days (OR:1.4 CI:0.68-2.89; p = .359) or 30-days readmissions (OR:1.02 CI:0.63-1.65; p = .935) in TKA. Logistic regression in THA was not possible due to limited use of PNB. In TKA there were 12 (2.1% CI:1.2-3.6) with and 1 (0.1% CI:0.02-0.7) without a PNB, who had mobilization, pain or opioid-related complications, and 5 (0.9% CI:0.4-2.0) versus 4 (0.5% CI:0.2-1.2) who fell. Correspondingly, 2 (3.7% CI:1.0-12.6) and 11 (0.6% CI:0.3-1.0) of THA patients had these complications, while 0 (0.0% CI:0.0-6.6) and 17 (0.8% CI:0.5-1.3) fell.CONCLUSION: Routine use of peripheral nerve blocks was not associated with early discharge or 30-days readmissions i

Published
2023

8. Classifying Mixing Regimes in Ponds and Shallow Lakes

Author

Holgerson, Meredith A., Richardson, David C., Roith, Joseph, Bortolotti, Lauren E., Finlay, Kerri, Hornbach, Daniel J., Gurung, Kshitij, Ness, Andrew, Andersen, Mikkel R., Bansal, Sheel, Finlay, Jacques C., Cianci‐Gaskill, Jacob A., Hahn, Shannon, Janke, Benjamin D., McDonald, Cory, Mesman, Jorrit P., North, Rebecca L., Roberts, Cassandra O., Sweetman, Jon N., and Webb, Jackie R.

Subjects
Miljövetenskap, Environmental Sciences, Water Science and Technology
Abstract

Lakes are classified by thermal mixing regimes, with shallow waterbodies historically categorized as continuously mixing systems. Yet, recent studies demonstrate extended summertime stratification in ponds, underscoring the need to reassess thermal classifications for shallow waterbodies. In this study, we examined the summertime thermal dynamics of 34 ponds and shallow lakes across temperate North America and Europe to categorize and identify the drivers of different mixing regimes. We identified three mixing regimes: rarely (n = 18), intermittently (n = 10), and often (n = 6) mixed, where waterbodies mixed an average of 2%, 26%, and 75% of the study period, respectively. Waterbodies in the often mixed category were larger (≥4.17 ha) and stratification weakened with increased wind shear stress, characteristic of “shallow lakes.” In contrast, smaller waterbodies, or “ponds,” mixed less frequently, and stratification strengthened with increased shortwave radiation. Shallow ponds (

Published
2022

9. Peripheral nerve‐blocks and associations with length of stay and readmissions in fast‐track total hip and knee arthroplasty.

Author

Jørgensen, Christoffer C., Petersen, Pelle B., Daugberg, Louise O., Jakobsen, Thomas, Gromov, Kirill, Varnum, Claus, Andersen, Mikkel R., Palm, Henrik, and Kehlet, Henrik

Subjects
TOTAL hip replacement, TOTAL knee replacement, PATIENT readmissions, NERVE block, MEDICAL registries
Abstract

Background: Peripheral nerve blocks (PNB) have recently been recommended in total hip (THA) and knee (TKA) arthroplasty as they may reduce pain, morphine consumption, length of stay (LOS) and complications. However, whether PNBs are associated with early discharge within an enhanced recovery protocol including multimodal analgesia is uncertain. Methods: An observational multicenter study from January to August 2017 in six Danish Arthroplasty Centers with established fast‐track protocols. Prospective recording of preoperative characteristics and information on PNB, LOS and readmissions through the Danish National Patient Registry and medical records. Multiple logistic regression was used to investigate associations between PNB and a LOS >1 day, LOS >4 days, and 30‐days readmissions. We also reported on mobilization, pain, opioid and fall‐related complications leading to LOS >4 days or readmissions. Results: A total of 2027 (58.6%) THA and 1432 (41.4%) TKAs with a median LOS of 1 day (IQR 1–2) and 5.3% (CI:4.6–6.1) 30‐days readmission rate were identified. PNB was used in 40.7% (CI:38.2–43.3) of TKA and 2.7% (CI:2.0–3.5) of THA, but with considerable interdepartmental variation (0.0–89.0% for TKA). There was no association between PNB and LOS >1 day (OR:1.19 CI:0.82–1.72; p =.354), LOS >4 days (OR:1.4 CI:0.68–2.89; p =.359) or 30‐days readmissions (OR:1.02 CI:0.63–1.65; p =.935) in TKA. Logistic regression in THA was not possible due to limited use of PNB. In TKA there were 12 (2.1% CI:1.2–3.6) with and 1 (0.1% CI:0.02–0.7) without a PNB, who had mobilization, pain or opioid‐related complications, and 5 (0.9% CI:0.4–2.0) versus 4 (0.5% CI:0.2–1.2) who fell. Correspondingly, 2 (3.7% CI:1.0–12.6) and 11 (0.6% CI:0.3–1.0) of THA patients had these complications, while 0 (0.0% CI:0.0–6.6) and 17 (0.8% CI:0.5–1.3) fell. Conclusion: Routine use of peripheral nerve blocks was not associated with early discharge or 30‐days readmissions in fast‐track THA and TKA. Future studies should focus on benefits of PNB in high‐risk patients. [ABSTRACT FROM AUTHOR]

Published
2023
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10. Storm impacts on phytoplankton community dynamics in lakes

Author

Stockwell, Jason D., Doubek, Jonathan P., Adrian, Rita, Anneville, Orlane, Carey, Cayelan C., Carvalho, Laurence, Domis, Lisette N. De Senerpont, Dur, Gael, Frassl, Marieke A., Grossart, Hans-Peter, Ibelings, Bas W., Lajeunesse, Marc J., Lewandowska, Aleksandra M., Llames, Maria E., Matsuzaki, Shin-Ichiro S., Nodine, Emily R., Noges, Peeter, Patil, Vijay P., Pomati, Francesco, Rinke, Karsten, Rudstam, Lars G., Rusak, James A., Salmaso, Nico, Seltmann, Christian T., Straile, Dietmar, Thackeray, Stephen J., Thiery, Wim, Urrutia Cordero, Pablo, Venail, Patrick, Verburg, Piet, Woolway, R. Iestyn, Zohary, Tamar, Andersen, Mikkel R., Bhattacharya, Ruchi, Hejzlar, Josef, Janatian, Nasime, Kpodonu, Alfred T. N. K., Williamson, Tanner J., Wilson, Harriet L., Stockwell, Jason D., Doubek, Jonathan P., Adrian, Rita, Anneville, Orlane, Carey, Cayelan C., Carvalho, Laurence, Domis, Lisette N. De Senerpont, Dur, Gael, Frassl, Marieke A., Grossart, Hans-Peter, Ibelings, Bas W., Lajeunesse, Marc J., Lewandowska, Aleksandra M., Llames, Maria E., Matsuzaki, Shin-Ichiro S., Nodine, Emily R., Noges, Peeter, Patil, Vijay P., Pomati, Francesco, Rinke, Karsten, Rudstam, Lars G., Rusak, James A., Salmaso, Nico, Seltmann, Christian T., Straile, Dietmar, Thackeray, Stephen J., Thiery, Wim, Urrutia Cordero, Pablo, Venail, Patrick, Verburg, Piet, Woolway, R. Iestyn, Zohary, Tamar, Andersen, Mikkel R., Bhattacharya, Ruchi, Hejzlar, Josef, Janatian, Nasime, Kpodonu, Alfred T. N. K., Williamson, Tanner J., and Wilson, Harriet L.

Abstract

In many regions across the globe, extreme weather events such as storms have increased in frequency, intensity, and duration due to climate change. Ecological theory predicts that such extreme events should have large impacts on ecosystem structure and function. High winds and precipitation associated with storms can affect lakes via short-term runoff events from watersheds and physical mixing of the water column. In addition, lakes connected to rivers and streams will also experience flushing due to high flow rates. Although we have a well-developed understanding of how wind and precipitation events can alter lake physical processes and some aspects of biogeochemical cycling, our mechanistic understanding of the emergent responses of phytoplankton communities is poor. Here we provide a comprehensive synthesis that identifies how storms interact with lake and watershed attributes and their antecedent conditions to generate changes in lake physical and chemical environments. Such changes can restructure phytoplankton communities and their dynamics, as well as result in altered ecological function (e.g., carbon, nutrient and energy cycling) in the short- and long-term. We summarize the current understanding of storm-induced phytoplankton dynamics, identify knowledge gaps with a systematic review of the literature, and suggest future research directions across a gradient of lake types and environmental conditions.

Published
2020
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11. Storm impacts on phytoplankton community dynamics in lakes

Author

Stockwell, Jason D, Doubek, Jonathan P, Adrian, Rita, Anneville, Orlane, Carey, Cayelan C, Carvalho, Laurence, De Senerpont Domis, Lisette N, Dur, Gaël, Frassl, Marieke A, Grossart, Hans-Peter, Ibelings, Bas W, Lajeunesse, Marc J, Lewandowska, Aleksandra M, Llames, María E, Matsuzaki, Shin-Ichiro S, Nodine, Emily R, Nõges, Peeter, Patil, Vijay P, Pomati, Francesco, Rinke, Karsten, Rudstam, Lars G, Rusak, James A, Salmaso, Nico, Seltmann, Christian T, Straile, Dietmar, Thackeray, Stephen J, Thiery, Wim, Urrutia-Cordero, Pablo, Venail, Patrick, Verburg, Piet, Woolway, R Iestyn, Zohary, Tamar, Andersen, Mikkel R, Bhattacharya, Ruchi, Hejzlar, Josef, Janatian, Nasime, Kpodonu, Alfred T N K, Williamson, Tanner J, Wilson, Harriet L, Stockwell, Jason D, Doubek, Jonathan P, Adrian, Rita, Anneville, Orlane, Carey, Cayelan C, Carvalho, Laurence, De Senerpont Domis, Lisette N, Dur, Gaël, Frassl, Marieke A, Grossart, Hans-Peter, Ibelings, Bas W, Lajeunesse, Marc J, Lewandowska, Aleksandra M, Llames, María E, Matsuzaki, Shin-Ichiro S, Nodine, Emily R, Nõges, Peeter, Patil, Vijay P, Pomati, Francesco, Rinke, Karsten, Rudstam, Lars G, Rusak, James A, Salmaso, Nico, Seltmann, Christian T, Straile, Dietmar, Thackeray, Stephen J, Thiery, Wim, Urrutia-Cordero, Pablo, Venail, Patrick, Verburg, Piet, Woolway, R Iestyn, Zohary, Tamar, Andersen, Mikkel R, Bhattacharya, Ruchi, Hejzlar, Josef, Janatian, Nasime, Kpodonu, Alfred T N K, Williamson, Tanner J, and Wilson, Harriet L

Abstract

In many regions across the globe, extreme weather events such as storms have increased in frequency, intensity, and duration due to climate change. Ecological theory predicts that such extreme events should have large impacts on ecosystem structure and function. High winds and precipitation associated with storms can affect lakes via short-term runoff events from watersheds and physical mixing of the water column. In addition, lakes connected to rivers and streams will also experience flushing due to high flow rates. Although we have a well-developed understanding of how wind and precipitation events can alter lake physical processes and some aspects of biogeochemical cycling, our mechanistic understanding of the emergent responses of phytoplankton communities is poor. Here we provide a comprehensive synthesis that identifies how storms interact with lake and watershed attributes and their antecedent conditions to generate changes in lake physical and chemical environments. Such changes can restructure phytoplankton communities and their dynamics, as well as result in altered ecological function (e.g., carbon, nutrient and energy cycling) in the short- and long-term. We summarize the current understanding of storm-induced phytoplankton dynamics, identify knowledge gaps with a systematic review of the literature, and suggest future research directions across a gradient of lake types and environmental conditions.

Published
2020

12. Migration of the uncemented Echo Bi-Metric and Bi-Metric THA stems:a randomized controlled RSA study involving 62 patients with 24-month follow-up

Author

Dyreborg, Karen, Andersen, Mikkel R., Winther, Nikolaj, Solgaard, Søren, Flivik, Gunnar, Petersen, Michael M., Dyreborg, Karen, Andersen, Mikkel R., Winther, Nikolaj, Solgaard, Søren, Flivik, Gunnar, and Petersen, Michael M.

Abstract

Background and purpose — Despite the good results after total hip arthroplasty (THA), new implants are continuously being developed to improve durability. The Echo Bi-Metric (EBM) THA stem is the successor to the Bi-Metric (BM) THA stem. The EBM stem includes many of the features of the BM stem, but minor changes in the design might improve the clinical performance. We compared the migration behavior with radiostereometric analysis (RSA) of the EBM stem and the BM stem at 24 months and evaluated the clinical outcome. Patients and methods — We randomized 62 patients with osteoarthritis (mean age 64 years, female/male 28/34) scheduled for an uncemented THA to receive either an EBM or a BM THA stem. We performed RSA within 1 week after surgery and at 3, 6, 12, and 24 months. The clinical outcome was evaluated using Harris Hip Score (HHS) and Oxford Hip Score (OHS). Results — At 24 months, we found no statistically significant differences in migration between the two implants. During the first 3 months both the EBM and the BM stems showed visible subsidence (2.5 mm and 2.2 mm respectively), and retroversion (2.5° and 2.2° respectively), but after 3 months this stabilized. The expected increase in HHS and OHS was similar between the groups. Interpretation — The EBM stem showed a migration at 24 months not different from the BM stem, and both stems display satisfying clinical results.

Published
2020

14. Storm impacts on phytoplankton community dynamics in lakes

Author

Stockwell, Jason D., primary, Doubek, Jonathan P., additional, Adrian, Rita, additional, Anneville, Orlane, additional, Carey, Cayelan C., additional, Carvalho, Laurence, additional, De Senerpont Domis, Lisette N., additional, Dur, Gaël, additional, Frassl, Marieke A., additional, Grossart, Hans‐Peter, additional, Ibelings, Bas W., additional, Lajeunesse, Marc J., additional, Lewandowska, Aleksandra M., additional, Llames, María E., additional, Matsuzaki, Shin‐Ichiro S., additional, Nodine, Emily R., additional, Nõges, Peeter, additional, Patil, Vijay P., additional, Pomati, Francesco, additional, Rinke, Karsten, additional, Rudstam, Lars G., additional, Rusak, James A., additional, Salmaso, Nico, additional, Seltmann, Christian T., additional, Straile, Dietmar, additional, Thackeray, Stephen J., additional, Thiery, Wim, additional, Urrutia‐Cordero, Pablo, additional, Venail, Patrick, additional, Verburg, Piet, additional, Woolway, R. Iestyn, additional, Zohary, Tamar, additional, Andersen, Mikkel R., additional, Bhattacharya, Ruchi, additional, Hejzlar, Josef, additional, Janatian, Nasime, additional, Kpodonu, Alfred T. N. K., additional, Williamson, Tanner J., additional, and Wilson, Harriet L., additional

Published
2020
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15. Sediment oxygen uptake and DIC and Ca2+ release materials and methods.; Table S1; Table S2.; Figure S1; Figure S2 from Extreme diel dissolved oxygen and carbon cycles in shallow vegetated lakes

Author

Andersen, Mikkel R., Kragh, Theis, and Sand-Jensen, Kaj

Abstract

Supplementary materials and methods.; Maximum differences between surface and bottom water temperature (°C) during night and day in Lake 1 in May and August. Negative values denote that surface water is colder than bottom water.;Mean values ± 95 % C.I. (n = 5) of sediment oxygen uptake and release of DIC and Ca2-. Concentrations were measured four times per sediment core after 0, 24, 41 and 81 hours incubation. Units: mmol m-2 d-1;ANC in lake water (Lake 1-4) as a function of specific conductivity;Surface water temperature (full line) and air temperature (dashed line) in Lake 1 during periods of 5 days in May 2014 and August 2013

Published
2017
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16. Diel Surface Temperature Range Scales with Lake Size

Author

Woolway, R. Iestyn, Jones, Ian D., Maberly, Stephen C., French, Jon R., Livingstone, David M., Monteith, Donald T., Simpson, Gavin L., Thackeray, Stephen J., Andersen, Mikkel R., Battarbee, Richard W., DeGasperi, Curtis L., Evans, Christopher D., de Eyto, Elvira, Feuchtmayr, Heidrun, Hamilton, David P., Kernan, Martin, Krokowski, Jan, Rimmer, Alon, Rose, Kevin C., Rusak, James A., Ryves, David B., Scott, Daniel R., Shilland, Ewan M., Smyth, Robyn L., Staehr, Peter A., Thomas, Rhian, Waldron, Susan, Weyhenmeyer, Gesa A., Woolway, R. Iestyn, Jones, Ian D., Maberly, Stephen C., French, Jon R., Livingstone, David M., Monteith, Donald T., Simpson, Gavin L., Thackeray, Stephen J., Andersen, Mikkel R., Battarbee, Richard W., DeGasperi, Curtis L., Evans, Christopher D., de Eyto, Elvira, Feuchtmayr, Heidrun, Hamilton, David P., Kernan, Martin, Krokowski, Jan, Rimmer, Alon, Rose, Kevin C., Rusak, James A., Ryves, David B., Scott, Daniel R., Shilland, Ewan M., Smyth, Robyn L., Staehr, Peter A., Thomas, Rhian, Waldron, Susan, and Weyhenmeyer, Gesa A.

Abstract

Ecological and biogeochemical processes in lakes are strongly dependent upon water temperature. Long-term surface warming of many lakes is unequivocal, but little is known about the comparative magnitude of temperature variation at diel timescales, due to a lack of appropriately resolved data. Here we quantify the pattern and magnitude of diel temperature variability of surface waters using high-frequency data from 100 lakes. We show that the near-surface diel temperature range can be substantial in summer relative to long-term change and, for lakes smaller than 3 km(2), increases sharply and predictably with decreasing lake area. Most small lakes included in this study experience average summer diel ranges in their near-surface temperatures of between 4 and 7 degrees C. Large diel temperature fluctuations in the majority of lakes undoubtedly influence their structure, function and role in biogeochemical cycles, but the full implications remain largely unexplored.

Published
2016
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17. Diel Surface Temperature Range Scales with Lake Size

Author

Woolway, R. Iestyn, primary, Jones, Ian D., additional, Maberly, Stephen C., additional, French, Jon R., additional, Livingstone, David M., additional, Monteith, Donald T., additional, Simpson, Gavin L., additional, Thackeray, Stephen J., additional, Andersen, Mikkel R., additional, Battarbee, Richard W., additional, DeGasperi, Curtis L., additional, Evans, Christopher D., additional, de Eyto, Elvira, additional, Feuchtmayr, Heidrun, additional, Hamilton, David P., additional, Kernan, Martin, additional, Krokowski, Jan, additional, Rimmer, Alon, additional, Rose, Kevin C., additional, Rusak, James A., additional, Ryves, David B., additional, Scott, Daniel R., additional, Shilland, Ewan M., additional, Smyth, Robyn L., additional, Staehr, Peter A., additional, Thomas, Rhian, additional, Waldron, Susan, additional, and Weyhenmeyer, Gesa A., additional

Published
2016
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19. Storm impacts on phytoplankton community dynamics in lakes

Author

Stockwell, Jason D., Doubek, Jonathan P., Adrian, Rita, Anneville, Orlane, Carey, Cayelan C., Carvalho, Laurence, De Senerpont Domis, Lisette N., Dur, Gaël, Frassl, Marieke A., Grossart, Hans-Peter, Ibelings, Bas W., Lajeunesse, Marc J., Lewandowska, Aleksandra M., Llames, Maria E., Matsuzaki, Shin-Ichiro S., Nodine, Emily R., Nõges, Peeter, Patil, Vijay P., Pomati, Francesco, Rinke, Karsten, Rudstam, Lars G., Rusak, James A., Salmaso, Nico, Seltmann, Christian T., Straile, Dietmar, Thackeray, Stephen J., Thiery, Wim, Urrutia-Cordero, Pablo, Venail, Patrick, Verburg, Piet, Woolway, R. Iestyn, Zohary, Tamar, Andersen, Mikkel R., Bhattacharya, Ruchi, Hejzlar, Josef, Janatian, Nasime, Kpodonu, Alfred T.N.K., Williamson, Tanner J., and Wilson, Harriet L.

Subjects
extreme events, climate change, environmental disturbance, 13. Climate action, nutrients, mixing, functional traits, 15. Life on land, stability, watershed
Abstract

In many regions across the globe, extreme weather events such as storms have increased in frequency, intensity, and duration due to climate change. Ecological theory predicts that such extreme events should have large impacts on ecosystem structure and function. High winds and precipitation associated with storms can affect lakes via short‐term runoff events from watersheds and physical mixing of the water column. In addition, lakes connected to rivers and streams will also experience flushing due to high flow rates. Although we have a well‐developed understanding of how wind and precipitation events can alter lake physical processes and some aspects of biogeochemical cycling, our mechanistic understanding of the emergent responses of phytoplankton communities is poor. Here we provide a comprehensive synthesis that identifies how storms interact with lake and watershed attributes and their antecedent conditions to generate changes in lake physical and chemical environments. Such changes can restructure phytoplankton communities and their dynamics, as well as result in altered ecological function (e.g., carbon, nutrient and energy cycling) in the short‐ and long‐term. We summarize the current understanding of storm‐induced phytoplankton dynamics, identify knowledge gaps with a systematic review of the literature, and suggest future research directions across a gradient of lake types and environmental conditions., Global Change Biology, 26 (5), ISSN:1354-1013, ISSN:1365-2486

20. Day-case success or why still in hospital after total hip, total knee, and medial unicompartmental knee arthroplasties?

Author

Danielsen O, Jensen CB, Varnum C, Jakobsen T, Andersen MR, Bieder MJ, Overgaard S, Jørgensen CC, Kehlet H, Gromov K, and Lindberg-Larsen M

Abstract

Aims: Day-case success rates after primary total hip arthroplasty (THA), total knee arthroplasty (TKA), and medial unicompartmental knee arthroplasty (mUKA) may vary, and detailed data are needed on causes of not being discharged. The aim of this study was to analyze the association between surgical procedure type and successful day-case surgery, and to analyze causes of not being discharged on the day of surgery when eligible and scheduled for day-case THA, TKA, and mUKA., Methods: A multicentre, prospective consecutive cohort study was carried out from September 2022 to August 2023. Patients were screened for day-case eligibility using well defined inclusion and exclusion criteria, and discharged when fulfilling predetermined discharge criteria. Day-case eligible patients were scheduled for surgery with intended start of surgery before 1.00 pm., Results: Of 6,142 primary hip and knee arthroplasties, eligibility rates for day-case surgery were 34% for THA (95% CI 32% to 36%), 34% for TKA (95% CI 32% to 36%), and 52% for mUKA (95% CI 49% to 55%). Surgery before 1.00 pm was achieved in 85% of eligible patients. The day-case success rate among patients with surgery before 1.00 pm was 59% (95% CI 55% to 62%) for THA, 61% (95% CI 57% to 65%) for TKA, and 72% (95% CI 68% to 76%) for mUKA. Overall day-case success rates (eligible and non-eligible) were 19% (95% CI 17% to 20%) for THA, 20% (95% CI 18% to 21%) for TKA, and 42% (95% CI 39% to 45%) for mUKA. Adjusted analysis confirmed higher day-case success in eligible mUKA patients (odds ratio 1.9 (1.6 to 2.3)) compared to TKA and THA patients. Primary causes for day-case failure were mobilization issues (9% to 12% between procedures), prolonged spinal anaesthesia (4% to 9%), and postoperative nausea and vomiting (PONV) (4% to 14%)., Conclusion: THA and TKA patients showed comparable eligibility (34%) with similar day-case success rates (59 to 61%), whereas mUKA patients demonstrated higher eligibility (52%) and day-case success (72%). Mobilization issues, prolonged spinal anaesthesia, and PONV were the most frequent causes for not being discharged., Competing Interests: The salary for PhD student O. Danielsen was provided through funding from the Candy's Foundation, the University of Southern Denmark, and the Region of Southern Denmark. C. Varnum received travel expenses from Stryker, which is unrelated to this work. M. R. Andersen is secretary of the Danish Society for Hip and Knee Arthroplasty, which is unrelated. S. Overgaard received personal payment for a lecture from Johnson & Johnson, and institutional payment for being a course moderator and lectures from Heraeus, which are unrelated. C. C. Jørgensen received personal speaker fees and travel support from Pharmacosmos, unrelated to this work. H. Kehlet is on the Zimmer Biomet advisory board on rapid recovery. K. Gromov received research and institutional support from Zimmer Biomet, which was also unrelated., (© 2024 Danielsen et al.)

Published
2024
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