Limnology and Oceanography最新文献_第7页

Ontogenetic shifts by juvenile fishes highlight the need for habitat heterogeneity and connectivity in river restoration

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-28 DOI: 10.1002/lno.12797

Twan Stoffers, Anthonie D. Buijse, Jan Jaap Poos, Johan A. J. Verreth, Leopold A. J. Nagelkerke

{"title":"Ontogenetic shifts by juvenile fishes highlight the need for habitat heterogeneity and connectivity in river restoration","authors":"Twan Stoffers, Anthonie D. Buijse, Jan Jaap Poos, Johan A. J. Verreth, Leopold A. J. Nagelkerke","doi":"10.1002/lno.12797","DOIUrl":"10.1002/lno.12797","url":null,"abstract":"Large-scale anthropogenic river modifications have caused the loss of critical floodplain nursery habitats for riverine fish, leading to population declines. Restoration efforts have been implemented to recover these habitats, but with varying success. Understanding how larval and juvenile fish use habitats in dynamic river environments is essential for improving restoration strategies. We assessed ontogenetic shifts in habitat use by young-of-the-year fishes in the lower Rhine, analyzing 2167 samples across 18 restored floodplains over three growing seasons (2018–2020). Five distinct nursery habitats were identified: (1) exposed, fast-flowing habitats with coarse substrate; (2) turbid, nonflowing areas with high turbidity and chlorophyll; (3) shallow, vegetated habitats with macrophytes and shoreline vegetation; (4) deeper, sheltered habitats with structural complexity; and (5) shallow, slow-flowing areas. Habitat use shifted significantly with ontogeny across species. Larvae generally preferred shallow habitats (< 50-cm depth), either in slow-flowing areas (e.g., asp, ide, monkey goby, nase, and whitefin gudgeon) or vegetated zones with macrophytes (e.g., bleak, bitterling, bream, round goby, and zander). Juveniles increasingly used deeper habitats (> 50-cm depth), favoring fast-flowing areas (e.g., asp, barbel, ide), or deeper, nonflowing habitats (e.g., bream, zander). Our findings thus highlight the critical importance of habitat heterogeneity and connectivity for riverine fish biodiversity. Restoration strategies should prioritize the creation of a mosaic of shallow, low-velocity habitats for larvae, alongside deeper, fast-flowing, or sheltered areas for juveniles. Additionally, the movement of rheophilic species from floodplain habitats to the main river channel emphasizes the need for maintaining continuous connectivity between floodplains and the river.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"732-748"},"PeriodicalIF":3.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12797","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143054920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Epiphyton phenology determines the persistence of submerged macrophytes: Exemplified in temperate shallow lakes

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-28 DOI: 10.1002/lno.12808

Alena S. Gsell, Sven Teurlincx, Marta M. Alirangues Nuñez, Sabine Hilt

{"title":"Epiphyton phenology determines the persistence of submerged macrophytes: Exemplified in temperate shallow lakes","authors":"Alena S. Gsell, Sven Teurlincx, Marta M. Alirangues Nuñez, Sabine Hilt","doi":"10.1002/lno.12808","DOIUrl":"10.1002/lno.12808","url":null,"abstract":"Submerged macrophytes are key components in many freshwater and marine ecosystems, contributing to ecosystem functions and services. In temperate shallow lakes, spring epiphyton shading can be decisive for submerged macrophyte development, potentially leading to macrophyte collapse and a shift to undesired, turbid conditions. Global change can alter epiphyton phenology; however, the consequences for submerged macrophytes and their stabilizing effects on clear-water conditions remain to be elucidated. Based on field data, we propose a general epiphyton shading phenology for submerged macrophytes in temperate shallow lake ecosystems. We express the temporal dynamics of epiphyton shading in terms of onset and relative increase (slope) of epiphyton development as well as epiphyton grazing impacts (onset, duration) using a Boltzmann function. This function is added to the ecosystem model PCLake+ as a customizable, macrophyte-specific shading factor. We then assess how changes in the epiphyton phenology and the presence of grazing on epiphyton affects submerged macrophyte biomass in a generic temperate shallow model lake under control and warm winter scenarios. The results from the model provide a proof-of-concept that epiphyton shading can provoke macrophyte loss and shifts between alternative equilibria. Threshold values for critical shifts depend on epiphyton shading phenology. Earlier onset and longer duration of grazing can maintain macrophytes in nutrient or climate conditions under which they would otherwise collapse. Our results show the pivotal importance of epiphyton phenology in determining lake ecosystem-wide responses stressing the need for better incorporation of epiphyton into both models and monitoring.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"764-774"},"PeriodicalIF":3.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12808","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143054918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hypoxia threatens coral and sea anemone early life stages 缺氧威胁着珊瑚和海葵的早期生命阶段

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-21 DOI: 10.1002/lno.12798

Benjamin H. Glass, Katie L. Barott

{"title":"Hypoxia threatens coral and sea anemone early life stages","authors":"Benjamin H. Glass, Katie L. Barott","doi":"10.1002/lno.12798","DOIUrl":"10.1002/lno.12798","url":null,"abstract":"Seawater hypoxia is increasing globally and can drive declines in organismal performance across a wide range of marine taxa. However, the effects of hypoxia on early life stages (e.g., larvae and juveniles) are largely unknown, and it is unclear how evolutionary and life histories may influence these outcomes. Here, we addressed this question by comparing hypoxia responses across early life stages of three cnidarian species representing a range of life histories: the reef-building coral Galaxea fascicularis, a broadcast spawner with horizontal transmission of endosymbiotic algae (family Symbiodiniaceae); the reef-building coral Porites astreoides, a brooder with vertical endosymbiont transmission; and the estuarine sea anemone Nematostella vectensis, a non-symbiotic broadcast spawner. Transient exposure of larvae to hypoxia (dissolved oxygen < 2 mg L−1 for 6 h) led to decreased larval swimming and growth for all three species, which resulted in impaired settlement for the corals. Coral-specific responses also included larval swelling, depressed respiration rates, and decreases in symbiont densities and function. These results indicate both immediate and latent negative effects of hypoxia on cnidarian physiology and coral–algal mutualisms specifically. In addition, G. fascicularis and P. astreoides were sensitized to heat stress following hypoxia exposure, suggesting that the combinatorial nature of climate stressors will lead to declining performance for corals. However, sensitization to heat stress was not observed in N. vectensis exposed to hypoxia, suggesting that this species may be more resilient to combined stressors. Overall, these results emphasize the importance of reducing anthropogenic carbon emissions to limit further ocean deoxygenation and warming.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"684-699"},"PeriodicalIF":3.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12798","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

How ecological regimes and emergent macrophytes determine sediment microbial communities: A new insight into typical eutrophic shallow lakes 生态制度和新兴大型植物如何决定沉积物微生物群落：对典型富营养化浅湖的新见解

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-21 DOI: 10.1002/lno.12799

Rujia He, Dayong Zhao, Qi Zhou, Qinglong L. Wu, Jin Zeng

{"title":"How ecological regimes and emergent macrophytes determine sediment microbial communities: A new insight into typical eutrophic shallow lakes","authors":"Rujia He, Dayong Zhao, Qi Zhou, Qinglong L. Wu, Jin Zeng","doi":"10.1002/lno.12799","DOIUrl":"10.1002/lno.12799","url":null,"abstract":"Understanding the response of microbial communities to different ecological regimes in eutrophic lakes and the underlying assembly mechanisms is of great significance for revealing the biodiversity maintenance mechanisms of lake ecosystems under alternative stable states. However, our current understanding of the response of sediment microbial communities under emergent macrophytes to regime shifts remains limited. Here, we demonstrated, for the first time, the asynchronous variations of littoral sediment bacterial and fungal communities, regarding the microbial diversities, assembly mechanisms, and inter-kingdom interactions across three lake regional regimes: macrophyte-dominated, transitional, and phytoplankton-dominated. We found the alpha diversities of the bacterial and fungal communities showed opposite trends, as the transitional regime had the highest bacterial but lowest fungal diversities. Stochastic processes, dominated by dispersal limitation, determined fungal community assembly, whereas deterministic processes, especially variable selection, shaped the bacterial community. The highest number of species–environment interactions and proportion of intra-kingdom interactions were observed in the co-occurrence network of the transitional regime; however, this network had the lowest proportion of inter-kingdom (bacteria–fungi) interactions among the three lake regional regimes. Furthermore, the macrophyte-dominated regime was observed to have the most complex network structure and maintain the highest microbial community stability. The rhizosphere of Phragmites australis enhanced the inter-kingdom interactions of bacterial and fungal communities. These findings provide a preliminary ecological perspective for understanding the hysteresis of regimes in response to environmental stress at the microbial community level and emphasize the importance of distinguishing ecologically distinct microbial taxa in future studies focused on alternative stable states.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"700-717"},"PeriodicalIF":3.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Benthic bacterial communities are shaped by browning in boreal headwater streams 底栖细菌群落是由北方水源溪流的褐变形成的

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-21 DOI: 10.1002/lno.12801

Joanna Brüsecke, Timo Muotka, Kaisa-Leena Huttunen, Kaisa Lehosmaa, Jussi Jyväsjärvi

{"title":"Benthic bacterial communities are shaped by browning in boreal headwater streams","authors":"Joanna Brüsecke, Timo Muotka, Kaisa-Leena Huttunen, Kaisa Lehosmaa, Jussi Jyväsjärvi","doi":"10.1002/lno.12801","DOIUrl":"10.1002/lno.12801","url":null,"abstract":"Owing to the rapid progress of high-throughput sequencing technologies, microbial assemblages have gained growing interest in environmental impact assessment. However, research on microbial community responses, particularly those of benthic biofilm, to browning (increased concentrations of dissolved organic carbon [DOC]), is scarce. We used data from 55 boreal streams to examine if biofilm bacterial communities exhibit changes in diversity and community composition along a gradient of browning (3.6–27 mg DOC L−1). Species richness increased slightly with increasing DOC, whereas community composition changed markedly across the gradient, especially in the active community. Pseudomonadota and Bacteroidota were overall dominant bacterial phyla. In the active community, Bacteroidota became relatively less abundant and Pseudomonadota more abundant with increasing DOC. Nitrate-N (NO3-N) and DOC were the most important predictors of bacterial community turnover. The greatest change in community composition occurred between 75 and 100 μg NO3-N L−1. For DOC, the first change point was at the low-end of the gradient, followed by a major change in strongly brownified waters (> 20 mg L−1). Bacterial communities became phylogenetically more similar than expected by chance as DOC increased. Concordance between bacterial and benthic invertebrate communities was very high, indicating that browning exerts a strong control over both taxonomic groups. Our results suggest that microbial communities, particularly the active portion of the community, may provide a sensitive and reliable tool for stream bioassessment. We defined a threshold-type response in bacterial assemblages to water browning but more research is needed on microbial responses to multiple simultaneous stressors related to global warming and land-use intensification.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"718-731"},"PeriodicalIF":3.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Issue Information & TOC 发行信息和目录

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-20 DOI: 10.1002/lno.12806

引用次数: 0

Issue Information & Copyright 发行信息和版权

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-20 DOI: 10.1002/lno.12805

引用次数: 0

Issue Information & Masthead 发行信息和报头

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-20 DOI: 10.1002/lno.12804

引用次数: 0

Issue Information & Members 发行信息及会员

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-20 DOI: 10.1002/lno.12807

引用次数: 0

Production and transfer of essential fatty acids in a man-made tropical lake ecosystem 人造热带湖泊生态系统中必需脂肪酸的产生和转移

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-18 DOI: 10.1002/lno.12793

Sami Johan Taipale, Cyril Rigaud, Marco Lucas Calderini, Harri Asikainen, Jaakko Juhani Litmanen, Jussi Severi Vesamäki, Mzime Regina Ndebele-Murisa, Tamuka Nhiwatiwa

{"title":"Production and transfer of essential fatty acids in a man-made tropical lake ecosystem","authors":"Sami Johan Taipale, Cyril Rigaud, Marco Lucas Calderini, Harri Asikainen, Jaakko Juhani Litmanen, Jussi Severi Vesamäki, Mzime Regina Ndebele-Murisa, Tamuka Nhiwatiwa","doi":"10.1002/lno.12793","DOIUrl":"10.1002/lno.12793","url":null,"abstract":"Essential biomolecules, such as physiologically essential fatty acids, can critically influence consumers' performance and the ecosystem's functioning. Eicosapentaenoic (EPA; 20:5ω3) and docosahexaenoic (DHA; 22:6ω3) fatty acids are physiologically crucial for consumers, and they must be either obtained from the diet or bioconverted from precursors. We monitored the synthesis of EPA and DHA by primary producers in the largest man-made ecosystem (Lake Kariba) and in situ fatty acid production, trophic transfer, and endogenous production of EPA and DHA in the tropical lake food web using 13C-labeling, compound-specific isotopes, and gene expression of fads2 and elovl5 genes in most abundant fish species. Seston pigment analysis and 23S rRNA sequencing revealed that cyanobacteria dominated primary producers throughout three seasons, and the biosynthesis rate of EPA and DHA was under the detection limit. Moreover, due to the low zooplankton densities and EPA and DHA content in zooplankton, the transfer of EPA and DHA from phytoplankton–zooplankton to upper trophic levels is low. The low production of EPA and DHA by primary producers is mitigated by bioconversion of α-linolenic acid to EPA and DHA in two tilapia species, especially by Nile tilapia (Oreochromis niloticus) known to feed on cyanobacteria. Compound-specific isotope analysis revealed that tigerfish (Hydrocynus vittatus), the main predatory fish on the lake, was more closely related to Nile tilapia than to lake planktivorous fish (Limnothrissa miodon). Therefore, trophic interaction between cyanobacteria and algivorous fish has replaced traditional phytoplankton and zooplankton trophic interaction in the synthesis and transfer of EPA and DHA to upper trophic levels.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"667-683"},"PeriodicalIF":3.8,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142988999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0