Pub Date : 2022-09-26DOI: 10.1080/20442041.2022.2127609
M. Pilecky, P. Fink, Samuel K. Kämmer, M. Schott, M. Zehl, M. Kainz
ABSTRACT Lipids and fatty acids are key dietary components for the nutrition of organisms at all trophic levels. They are required to build cellular structures such as cell membranes, serve as energy storage, and take part in signal transduction cascades. For decades, ecological research investigated how dietary fatty acid availability contributes to the fitness of individuals and their populations. The omega-3 polyunsaturated fatty acid eicosapentaenoic acid (EPA) is of particular interest because its dietary availability determines the fitness of many aquatic consumers. Because of the small body size of zooplankton, only bulk tissue fatty acid analysis was previously performed, and thus the tissue-specific importance of EPA for zooplankton remained elusive. We used matrix-assisted laser desorption/ionization–mass spectrometry imaging (MALDI-MSI) to reveal the tissue-specific distribution of functional phospholipids in the herbivorous zooplankton Daphnia magna. We demonstrate several lipid species for heart, egg, gut, gonad, somatic, and neurological tissues of D. magna, including the compound eye as well as the optical and cerebral ganglion. The compound eye revealed a large diversity in lipid species containing EPA, which were also found in other neurological tissues and eggs. Such knowledge of tissue-specific fatty acid requirements is essential to investigate how selective allocation of dietary fatty acids within this key grazer affects processes on a functional and molecular level from the individual to food web scales. This methodological advancement will facilitate investigations on how invertebrate physiology and behaviour adjust to changing environmental conditions and potentially affect food web structures, including the trophic transfer of dietary fatty acids.
{"title":"Mass spectrometry imaging reveals the spatial distribution of essential lipids in Daphnia magna – potential implications for trophic ecology","authors":"M. Pilecky, P. Fink, Samuel K. Kämmer, M. Schott, M. Zehl, M. Kainz","doi":"10.1080/20442041.2022.2127609","DOIUrl":"https://doi.org/10.1080/20442041.2022.2127609","url":null,"abstract":"ABSTRACT Lipids and fatty acids are key dietary components for the nutrition of organisms at all trophic levels. They are required to build cellular structures such as cell membranes, serve as energy storage, and take part in signal transduction cascades. For decades, ecological research investigated how dietary fatty acid availability contributes to the fitness of individuals and their populations. The omega-3 polyunsaturated fatty acid eicosapentaenoic acid (EPA) is of particular interest because its dietary availability determines the fitness of many aquatic consumers. Because of the small body size of zooplankton, only bulk tissue fatty acid analysis was previously performed, and thus the tissue-specific importance of EPA for zooplankton remained elusive. We used matrix-assisted laser desorption/ionization–mass spectrometry imaging (MALDI-MSI) to reveal the tissue-specific distribution of functional phospholipids in the herbivorous zooplankton Daphnia magna. We demonstrate several lipid species for heart, egg, gut, gonad, somatic, and neurological tissues of D. magna, including the compound eye as well as the optical and cerebral ganglion. The compound eye revealed a large diversity in lipid species containing EPA, which were also found in other neurological tissues and eggs. Such knowledge of tissue-specific fatty acid requirements is essential to investigate how selective allocation of dietary fatty acids within this key grazer affects processes on a functional and molecular level from the individual to food web scales. This methodological advancement will facilitate investigations on how invertebrate physiology and behaviour adjust to changing environmental conditions and potentially affect food web structures, including the trophic transfer of dietary fatty acids.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":"13 1","pages":"111 - 120"},"PeriodicalIF":3.1,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49093725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-26DOI: 10.1080/20442041.2022.2129241
Elmo Pereira da Silva, W. Magnusson
ABSTRACT Natural selection is a key driver of organism size and shape, so resource use often depends on individual size. Among populations and assemblages there is overwhelming evidence that size- or stage-specific effects on niche occur mainly in habitat and food dimensions. A 2019 study by E. P. Silva and others, “Habitat segregation among freshwater shrimp species in an Amazonian rainforest stream system,” showed that Amazonian small-stream shrimp species show only slight habitat segregation at the scale of 50 m stream reaches, but that study did not take into account possible effects of intraspecific and interspecific differences in body size on habitat selection. We investigated through nighttime observations if conspecific shrimp of different sizes overlap in habitat use and whether heterospecific individuals of similar sizes differ in habitat use. Generalized linear mixed models were used to test possible relationships between body size and habitat features, and multivariate linear analysis and latent-variable model-based ordination were used to test for intraspecific and interspecific differences in habitat use. Mean frequency of use of habitat features differed among shrimp of different sizes and species, but use of habitat components strongly overlapped. Interspecific habitat overlap was greater among small individuals than large individuals. Our results indicate that size is not a major driver of habitat segregation in shrimp populations and assemblages, although it provides evidence of subtle ontogenetic shifts in habitat use by conspecifics of different sizes as well as differences between individuals of different species with similar sizes.
{"title":"A matter of size: Does habitat use depend on body size in Amazonian small-stream shrimp species?","authors":"Elmo Pereira da Silva, W. Magnusson","doi":"10.1080/20442041.2022.2129241","DOIUrl":"https://doi.org/10.1080/20442041.2022.2129241","url":null,"abstract":"ABSTRACT Natural selection is a key driver of organism size and shape, so resource use often depends on individual size. Among populations and assemblages there is overwhelming evidence that size- or stage-specific effects on niche occur mainly in habitat and food dimensions. A 2019 study by E. P. Silva and others, “Habitat segregation among freshwater shrimp species in an Amazonian rainforest stream system,” showed that Amazonian small-stream shrimp species show only slight habitat segregation at the scale of 50 m stream reaches, but that study did not take into account possible effects of intraspecific and interspecific differences in body size on habitat selection. We investigated through nighttime observations if conspecific shrimp of different sizes overlap in habitat use and whether heterospecific individuals of similar sizes differ in habitat use. Generalized linear mixed models were used to test possible relationships between body size and habitat features, and multivariate linear analysis and latent-variable model-based ordination were used to test for intraspecific and interspecific differences in habitat use. Mean frequency of use of habitat features differed among shrimp of different sizes and species, but use of habitat components strongly overlapped. Interspecific habitat overlap was greater among small individuals than large individuals. Our results indicate that size is not a major driver of habitat segregation in shrimp populations and assemblages, although it provides evidence of subtle ontogenetic shifts in habitat use by conspecifics of different sizes as well as differences between individuals of different species with similar sizes.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":"13 1","pages":"121 - 130"},"PeriodicalIF":3.1,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44267654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-21DOI: 10.1080/20442041.2022.2123680
Zemin Zhao, Fuzhong Wu, Yan Peng, Petr Heděnec, Yuan Wang, Wanrong Hu, X. Ni, Kai Yue
ABSTRACT Headwater streams, as the capillaries of rivers, largely control the functional integrity of the entire river network. Headwater stream sediments, especially fine sediments, are essential ecosystem components and dominant reservoirs for heavy metals, with these reservoirs significantly affecting their cycling in streams. However, the dynamics of heavy metals in headwater stream sediments are not well assessed in the literature. Here, we assessed the temporal and spatial storage dynamics of several common heavy metals (i.e., Mn, Zn, Cu, Cr, Cd, and Pb) in the fine sediments from a typical subtropical forest headwater stream during the rainy season of 2021 (Mar–Aug). We found that (1) the mean storage of fine sediment of heavy metals was ordered Mn (21.57 g m−2) > Pb (2.53 g m−2) > Zn (2.27 g m−2) > Cr (0.66 g m−2) > Cu (0.12 g m−2) > Cd (0.006 g m−2); (2) their storage had a transient increase during the rainy season, followed by a decrease, but storage of both Zn and Cr was unevenly distributed from stream source to mouth; and (3) the key factors controlling heavy metal storage were water alkalinity, temperature, and pH, as well as monthly precipitation. These findings suggest that forest headwater streams can store heavy metals, but the amounts vary across temporal and spatial scales. Our results help us better understand the role of headwater streams in storing and transferring materials in forest ecosystems.
摘要：作为河流的毛细血管，源头在很大程度上控制着整个河网的功能完整性。上游沉积物，特别是细沉积物，是重要的生态系统组成部分和重金属的主要储层，这些储层对其在溪流中的循环产生了重大影响。然而，文献中并没有很好地评估源头河流沉积物中重金属的动态。在这里，我们评估了2021年雨季（3月至8月）典型亚热带森林源头溪流细沉积物中几种常见重金属（即Mn、Zn、Cu、Cr、Cd和Pb）的时空储存动态。结果表明：（1）细粒沉积物中重金属的平均储量为Mn（21.57 g m−2）>Pb（2.53 g m−2）>锌（2.27 g m−2）>铬（0.66 g m−2）>铜（0.12 g m−2）>Cd（0.006 g m−2）；（2） 它们的储量在雨季有短暂的增加，然后减少，但Zn和Cr的储量从源头到河口分布不均；（3）控制重金属储存的关键因素是水体碱度、温度、pH值以及月降水量。这些发现表明，森林源头溪流可以储存重金属，但其数量在时间和空间尺度上有所不同。我们的研究结果有助于我们更好地了解源头溪流在森林生态系统中储存和转移物质的作用。
{"title":"Dynamics of heavy metals in the fine sediments from a subtropical forest headwater stream during a rainy season","authors":"Zemin Zhao, Fuzhong Wu, Yan Peng, Petr Heděnec, Yuan Wang, Wanrong Hu, X. Ni, Kai Yue","doi":"10.1080/20442041.2022.2123680","DOIUrl":"https://doi.org/10.1080/20442041.2022.2123680","url":null,"abstract":"ABSTRACT Headwater streams, as the capillaries of rivers, largely control the functional integrity of the entire river network. Headwater stream sediments, especially fine sediments, are essential ecosystem components and dominant reservoirs for heavy metals, with these reservoirs significantly affecting their cycling in streams. However, the dynamics of heavy metals in headwater stream sediments are not well assessed in the literature. Here, we assessed the temporal and spatial storage dynamics of several common heavy metals (i.e., Mn, Zn, Cu, Cr, Cd, and Pb) in the fine sediments from a typical subtropical forest headwater stream during the rainy season of 2021 (Mar–Aug). We found that (1) the mean storage of fine sediment of heavy metals was ordered Mn (21.57 g m−2) > Pb (2.53 g m−2) > Zn (2.27 g m−2) > Cr (0.66 g m−2) > Cu (0.12 g m−2) > Cd (0.006 g m−2); (2) their storage had a transient increase during the rainy season, followed by a decrease, but storage of both Zn and Cr was unevenly distributed from stream source to mouth; and (3) the key factors controlling heavy metal storage were water alkalinity, temperature, and pH, as well as monthly precipitation. These findings suggest that forest headwater streams can store heavy metals, but the amounts vary across temporal and spatial scales. Our results help us better understand the role of headwater streams in storing and transferring materials in forest ecosystems.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":"13 1","pages":"131 - 141"},"PeriodicalIF":3.1,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49279909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-16DOI: 10.1080/20442041.2022.2111180
Lena Fehlinger, B. Misteli, Daniel Morant, Noel P D Juvigny-Khenafou, David Cunillera‐Montcusí, F. Chaguaceda, Olivera Stamenković, J. Fahy, Vojtěch Kolář, Dariusz Halabowski, Liam N. Nash, E. Jakobsson, V. Nava, P. Tirozzi, Pablo Urrutia Cordero, J. Mocq, Alba Camacho Santamans, J. M. Zamora-Marín, Pierre Marle, T. Chonova, L. Bonacina, Margaux Mathieu‐Resuge, E. Suarez, S. Osakpolor, Pablo Timoner, Vesela V. Evtimova, Darmina Nita, B. M. Carreira, K. Tapolczai, J. Martelo, R. Gerber, Valentin Dinu, J. Henriques, G. Selmeczy, B. Rimcheska
ABSTRACT Permanent ponds are valuable freshwater systems and biodiversity hotspots. They provide diverse ecosystem services (ESs), including water quality improvement and supply, food provisioning, and biodiversity support, despite significant pressure from multiple anthropogenic stressors and the impacts of ongoing global change. However, ponds are largely overlooked in management plans and legislation, and ecological research has focused on large freshwater ecosystems, such as rivers or lakes. Protection of ponds is often insufficient or indirectly provided via associated habitats such as wetlands. This situation is likely exacerbated by the lack of a full-scale understanding of the importance of ponds. In this review, we provide a detailed overview of permanent ponds across Europe, including their usages and the biodiversity they support. By discussing the concepts of pondscape and metacommunity theory, we highlight the importance of connectivity among and between ponds and identified fluxes of emerging insects as another ES of ponds. Those insects are rich in essential nutrients such as polyunsaturated fatty acids (PUFAs), delivered through them to the terrestrial environment; however, the extent and impact of this ES remains largely unexplored. Several potential stressors, especially related to ongoing global change, that influence pond diversity and integrity are discussed. We provide our insights on future pond management. Adaptive measures, taking into account the pond system per se within the pondscape, are the most promising to mitigate the loss of natural ponds and restore and conserve natural small waterbodies as refuges and diversity hotspots in increasingly urbanized landscapes.
{"title":"The ecological role of permanent ponds in Europe: a review of dietary linkages to terrestrial ecosystems via emerging insects","authors":"Lena Fehlinger, B. Misteli, Daniel Morant, Noel P D Juvigny-Khenafou, David Cunillera‐Montcusí, F. Chaguaceda, Olivera Stamenković, J. Fahy, Vojtěch Kolář, Dariusz Halabowski, Liam N. Nash, E. Jakobsson, V. Nava, P. Tirozzi, Pablo Urrutia Cordero, J. Mocq, Alba Camacho Santamans, J. M. Zamora-Marín, Pierre Marle, T. Chonova, L. Bonacina, Margaux Mathieu‐Resuge, E. Suarez, S. Osakpolor, Pablo Timoner, Vesela V. Evtimova, Darmina Nita, B. M. Carreira, K. Tapolczai, J. Martelo, R. Gerber, Valentin Dinu, J. Henriques, G. Selmeczy, B. Rimcheska","doi":"10.1080/20442041.2022.2111180","DOIUrl":"https://doi.org/10.1080/20442041.2022.2111180","url":null,"abstract":"ABSTRACT Permanent ponds are valuable freshwater systems and biodiversity hotspots. They provide diverse ecosystem services (ESs), including water quality improvement and supply, food provisioning, and biodiversity support, despite significant pressure from multiple anthropogenic stressors and the impacts of ongoing global change. However, ponds are largely overlooked in management plans and legislation, and ecological research has focused on large freshwater ecosystems, such as rivers or lakes. Protection of ponds is often insufficient or indirectly provided via associated habitats such as wetlands. This situation is likely exacerbated by the lack of a full-scale understanding of the importance of ponds. In this review, we provide a detailed overview of permanent ponds across Europe, including their usages and the biodiversity they support. By discussing the concepts of pondscape and metacommunity theory, we highlight the importance of connectivity among and between ponds and identified fluxes of emerging insects as another ES of ponds. Those insects are rich in essential nutrients such as polyunsaturated fatty acids (PUFAs), delivered through them to the terrestrial environment; however, the extent and impact of this ES remains largely unexplored. Several potential stressors, especially related to ongoing global change, that influence pond diversity and integrity are discussed. We provide our insights on future pond management. Adaptive measures, taking into account the pond system per se within the pondscape, are the most promising to mitigate the loss of natural ponds and restore and conserve natural small waterbodies as refuges and diversity hotspots in increasingly urbanized landscapes.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":"13 1","pages":"30 - 46"},"PeriodicalIF":3.1,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43400876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-11DOI: 10.1080/20442041.2022.2111178
Jennifer N. Piacente, M. Berg
ABSTRACT Invasive species are a global concern impacting biodiversity, community structure, and ecological function of entire ecosystems. Elodea canadensis (Canadian waterweed) is a submerged aquatic macrophyte native to southern Canada and the 48 contiguous United States but invasive in Alaska. The purpose of our study was to compare aquatic macroinvertebrate communities associated with E. canadensis in native (Illinois) and invasive (Alaska) areas. Functional feeding group community structure of E. canadensis-associated macroinvertebrates was different in the invasive and native range. Collector-filterer relative abundance was higher in the invasive range, whereas predator-engulfer relative abundance was higher in the native range. Furthermore, shredder-herbivore density in E. canadensis beds was higher in the native range than in the invasive range. Our results suggest that the successful establishment of E. canadensis in Alaska is likely facilitated by reduced herbivory and that the continued spread of E. canadensis will alter ecosystem structure and function of the Copper River Delta, Alaska, and the ecosystem services it provides.
{"title":"Community structure of aquatic invertebrates associated with Elodea canadensis in its native and invasive range","authors":"Jennifer N. Piacente, M. Berg","doi":"10.1080/20442041.2022.2111178","DOIUrl":"https://doi.org/10.1080/20442041.2022.2111178","url":null,"abstract":"ABSTRACT Invasive species are a global concern impacting biodiversity, community structure, and ecological function of entire ecosystems. Elodea canadensis (Canadian waterweed) is a submerged aquatic macrophyte native to southern Canada and the 48 contiguous United States but invasive in Alaska. The purpose of our study was to compare aquatic macroinvertebrate communities associated with E. canadensis in native (Illinois) and invasive (Alaska) areas. Functional feeding group community structure of E. canadensis-associated macroinvertebrates was different in the invasive and native range. Collector-filterer relative abundance was higher in the invasive range, whereas predator-engulfer relative abundance was higher in the native range. Furthermore, shredder-herbivore density in E. canadensis beds was higher in the native range than in the invasive range. Our results suggest that the successful establishment of E. canadensis in Alaska is likely facilitated by reduced herbivory and that the continued spread of E. canadensis will alter ecosystem structure and function of the Copper River Delta, Alaska, and the ecosystem services it provides.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":"13 1","pages":"74 - 85"},"PeriodicalIF":3.1,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46787995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-03DOI: 10.1080/20442041.2022.2104591
John R. Jones
ABSTRACT Over the past century, the International Society of Limnology (SIL) has supported 3 noteworthy publications that document the discoveries of our predecessors and contemporaries. There are 30 volumes of the Verhandlungen (Proceedings, 1922–2010), which archive findings presented at SIL Congresses. The 25 volumes of the Mitteilungen (Communications, 1953–1996) include focal papers and collections on specific topics. Inland Waters (2011 and ongoing) is the peer-reviewed, scholarly outlet for original papers within the framework of SIL. We commemorate our 100-year history with an abridged content review of SIL publications and republish 15 articles (spanning 1953–2022) to illustrate the scope of past contributions and current directions of the Society.
{"title":"A century of scholarship archived in the Verhandlungen, Mitteilungen, and Inland Waters: publications of the International Society of Limnology","authors":"John R. Jones","doi":"10.1080/20442041.2022.2104591","DOIUrl":"https://doi.org/10.1080/20442041.2022.2104591","url":null,"abstract":"ABSTRACT Over the past century, the International Society of Limnology (SIL) has supported 3 noteworthy publications that document the discoveries of our predecessors and contemporaries. There are 30 volumes of the Verhandlungen (Proceedings, 1922–2010), which archive findings presented at SIL Congresses. The 25 volumes of the Mitteilungen (Communications, 1953–1996) include focal papers and collections on specific topics. Inland Waters (2011 and ongoing) is the peer-reviewed, scholarly outlet for original papers within the framework of SIL. We commemorate our 100-year history with an abridged content review of SIL publications and republish 15 articles (spanning 1953–2022) to illustrate the scope of past contributions and current directions of the Society.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":"12 1","pages":"427 - 433"},"PeriodicalIF":3.1,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41562991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-21DOI: 10.1080/20442041.2022.2102870
A. Bramburger, T. Ozersky, G. Silsbe, C. Crawford, L. Olmanson, K. Shchapov
ABSTRACT As global surface temperatures continue to rise as a result of anthropogenic climate change, effects in temperate lakes are likely to be more pronounced than in other ecosystems. Decreases in snow and ice cover extent and duration and extended periods of summer stratification have been observed in temperate lake systems throughout the Anthropocene. However, the effects of changing snow and ice cover on lacustrine communities remain largely uninvestigated. We examined underwater light climate and associated primary productivity patterns under snow-covered and clear-lake ice in 6 inland lakes in Minnesota, USA, spanning gradients of water column optical properties (blue, green, brown) associated with trophic status and organic material content. In all lakes, snow cover influenced not only the intensity, but also the spectral signature of light penetrating into the water column. Specifically, the wavelength of maximum penetration was shifted towards longer wavelengths under snow cover in green (eutrophic) lakes but was shifted towards shorter wavelengths in blue and brown lakes. Volumetric primary productivity was often higher than anticipated (e.g., ∼1200 mg m−3 d−1; Lake Minnetonka, snow-covered ice). Carbon assimilation rates were lower under snow-covered ice throughout the water column in all lake types except immediately under cleared ice in eutrophic lakes, where phytoplankton were likely photoinhibited because of the penetration of intense, short-wavelength light. These findings suggest that changes to snow and ice cover under ongoing climate change scenarios can affect patterns of phytoplankton primary productivity in sensitive aquatic ecosystems.
{"title":"The not-so-dead of winter: underwater light climate and primary productivity under snow and ice cover in inland lakes","authors":"A. Bramburger, T. Ozersky, G. Silsbe, C. Crawford, L. Olmanson, K. Shchapov","doi":"10.1080/20442041.2022.2102870","DOIUrl":"https://doi.org/10.1080/20442041.2022.2102870","url":null,"abstract":"ABSTRACT As global surface temperatures continue to rise as a result of anthropogenic climate change, effects in temperate lakes are likely to be more pronounced than in other ecosystems. Decreases in snow and ice cover extent and duration and extended periods of summer stratification have been observed in temperate lake systems throughout the Anthropocene. However, the effects of changing snow and ice cover on lacustrine communities remain largely uninvestigated. We examined underwater light climate and associated primary productivity patterns under snow-covered and clear-lake ice in 6 inland lakes in Minnesota, USA, spanning gradients of water column optical properties (blue, green, brown) associated with trophic status and organic material content. In all lakes, snow cover influenced not only the intensity, but also the spectral signature of light penetrating into the water column. Specifically, the wavelength of maximum penetration was shifted towards longer wavelengths under snow cover in green (eutrophic) lakes but was shifted towards shorter wavelengths in blue and brown lakes. Volumetric primary productivity was often higher than anticipated (e.g., ∼1200 mg m−3 d−1; Lake Minnetonka, snow-covered ice). Carbon assimilation rates were lower under snow-covered ice throughout the water column in all lake types except immediately under cleared ice in eutrophic lakes, where phytoplankton were likely photoinhibited because of the penetration of intense, short-wavelength light. These findings suggest that changes to snow and ice cover under ongoing climate change scenarios can affect patterns of phytoplankton primary productivity in sensitive aquatic ecosystems.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":"13 1","pages":"1 - 12"},"PeriodicalIF":3.1,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42945206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-13DOI: 10.1080/20442041.2022.2099218
Oyunchuluun Yadamsuren, Suvdtsetseg Chuluunbat, Sanaa Enkhtaivan, B. Hayford, C. Goulden
ABSTRACT Overgrazing is one of the major land-use impacts in Mongolia leading to habitat degradation and subsequent impairment of biological diversity. This study examined macroinvertebrate diversity among sites with different grazing intensities in Hövsgöl, Mongolia, to test whether the taxonomic and functional structure of the macroinvertebrate community differs among streams with different grazing intensity. The 14 551 total identified specimens comprised 78 genera in 27 macroinvertebrate families from the 6 study streams. Exponential Shannon index and weighted functional diversity were significantly higher in low grazing sites than in moderate and high grazing sites; no significant difference was found between moderate to high grazing intensity. Macroinvertebrate community composition was not significantly different between low and moderate or low and high grazing intensity sites. SIMPER analysis revealed the taxon with the highest contribution to dissimilarity among the levels of grazing. Thirteen trait categories from 8 traits differed significantly between sites with varying grazing pressure. The community-weighted means for 4 of these traits were filtered by high grazing intensity: dissemination, resistant form, current velocity, and saprobity. Although the other 4 traits differed significantly, they did not respond directly to grazing intensity. Further knowledge of traits, especially regarding physiological capabilities, is needed to better understand macroinvertebrate/environment relationships, but overall, these findings suggest that macroinvertebrate diversity components were affected by grazing.
{"title":"Effects of grazing on taxonomic and functional diversity of benthic macroinvertebrates of six tributary streams of the eastern shore of Lake Hövsgöl, Mongolia","authors":"Oyunchuluun Yadamsuren, Suvdtsetseg Chuluunbat, Sanaa Enkhtaivan, B. Hayford, C. Goulden","doi":"10.1080/20442041.2022.2099218","DOIUrl":"https://doi.org/10.1080/20442041.2022.2099218","url":null,"abstract":"ABSTRACT Overgrazing is one of the major land-use impacts in Mongolia leading to habitat degradation and subsequent impairment of biological diversity. This study examined macroinvertebrate diversity among sites with different grazing intensities in Hövsgöl, Mongolia, to test whether the taxonomic and functional structure of the macroinvertebrate community differs among streams with different grazing intensity. The 14 551 total identified specimens comprised 78 genera in 27 macroinvertebrate families from the 6 study streams. Exponential Shannon index and weighted functional diversity were significantly higher in low grazing sites than in moderate and high grazing sites; no significant difference was found between moderate to high grazing intensity. Macroinvertebrate community composition was not significantly different between low and moderate or low and high grazing intensity sites. SIMPER analysis revealed the taxon with the highest contribution to dissimilarity among the levels of grazing. Thirteen trait categories from 8 traits differed significantly between sites with varying grazing pressure. The community-weighted means for 4 of these traits were filtered by high grazing intensity: dissemination, resistant form, current velocity, and saprobity. Although the other 4 traits differed significantly, they did not respond directly to grazing intensity. Further knowledge of traits, especially regarding physiological capabilities, is needed to better understand macroinvertebrate/environment relationships, but overall, these findings suggest that macroinvertebrate diversity components were affected by grazing.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":"12 1","pages":"526 - 538"},"PeriodicalIF":3.1,"publicationDate":"2022-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41729620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-13DOI: 10.1080/20442041.2022.2096977
Mabano Amani, D. von Schiller, Isabel Suárez, Miren Atristain, A. Elosegi, R. Marcé, G. García-Baquero, B. Obrador
ABSTRACT Dam decommissioning (DD) is a viable management option for thousands of ageing dams. Reservoirs are large carbon sinks, and reservoir drawdown results in important carbon dioxide (CO2) and methane (CH4) emissions. We studied the effects of DD on CO2 and CH4 fluxes from impounded water, exposed sediment, and lotic water before, during, and 3–10 months after drawdown of the Enobieta Reservoir, north Iberian Peninsula. During the study period, impounded water covered 0–100%, exposed sediment 0–96%, and lotic water 0–4% of the total reservoir area (0.14 km2). Areal CO2 fluxes in exposed sediment (mean [SE]: 295.65 [74.90] mmol m−2 d−1) and lotic water (188.11 [86.09] mmol m−2 d−1) decreased over time but remained higher than in impounded water (−36.65 [83.40] mmol m−2 d−1). Areal CH4 fluxes did not change over time and were noteworthy only in impounded water (1.82 [1.11] mmol m−2 d−1). Total ecosystem carbon (CO2 + CH4) fluxes (kg CO2-eq d−1) were higher during and after than before reservoir drawdown because of higher CO2 fluxes from exposed sediment. The reservoir was a net sink of carbon before reservoir drawdown and became an important emitter of carbon during the first 10 months after reservoir drawdown. Future studies should examine mid- and long-term effects of DD on carbon fluxes, identify the drivers of areal CO2 fluxes from exposed sediment, and incorporate DD in the carbon footprint of reservoirs.
{"title":"The drawdown phase of dam decommissioning is a hot moment of gaseous carbon emissions from a temperate reservoir","authors":"Mabano Amani, D. von Schiller, Isabel Suárez, Miren Atristain, A. Elosegi, R. Marcé, G. García-Baquero, B. Obrador","doi":"10.1080/20442041.2022.2096977","DOIUrl":"https://doi.org/10.1080/20442041.2022.2096977","url":null,"abstract":"ABSTRACT Dam decommissioning (DD) is a viable management option for thousands of ageing dams. Reservoirs are large carbon sinks, and reservoir drawdown results in important carbon dioxide (CO2) and methane (CH4) emissions. We studied the effects of DD on CO2 and CH4 fluxes from impounded water, exposed sediment, and lotic water before, during, and 3–10 months after drawdown of the Enobieta Reservoir, north Iberian Peninsula. During the study period, impounded water covered 0–100%, exposed sediment 0–96%, and lotic water 0–4% of the total reservoir area (0.14 km2). Areal CO2 fluxes in exposed sediment (mean [SE]: 295.65 [74.90] mmol m−2 d−1) and lotic water (188.11 [86.09] mmol m−2 d−1) decreased over time but remained higher than in impounded water (−36.65 [83.40] mmol m−2 d−1). Areal CH4 fluxes did not change over time and were noteworthy only in impounded water (1.82 [1.11] mmol m−2 d−1). Total ecosystem carbon (CO2 + CH4) fluxes (kg CO2-eq d−1) were higher during and after than before reservoir drawdown because of higher CO2 fluxes from exposed sediment. The reservoir was a net sink of carbon before reservoir drawdown and became an important emitter of carbon during the first 10 months after reservoir drawdown. Future studies should examine mid- and long-term effects of DD on carbon fluxes, identify the drivers of areal CO2 fluxes from exposed sediment, and incorporate DD in the carbon footprint of reservoirs.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":"12 1","pages":"451 - 462"},"PeriodicalIF":3.1,"publicationDate":"2022-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47056099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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