We inadvertently reversed parts B and C of Figure 3. The caption remains the same, but herein is presented the corrected version of Figure 3.
我们无意中颠倒了图3的B和C部分。标题保持不变，但这里给出了图3的更正版本。
{"title":"Correction: Key Abiotic and Biotic Variables Influencing Lake Plankton Communities Across Canada","authors":"","doi":"10.1111/fwb.70091","DOIUrl":"https://doi.org/10.1111/fwb.70091","url":null,"abstract":"<p>We inadvertently reversed parts B and C of Figure 3. The caption remains the same, but herein is presented the corrected version of Figure 3.</p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 8","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pierre Quévreux, Kejun Zou, Sébastien Barot, Élisa Thébault, Emma Rochelle-Newall, Ludwig Jardillier, Éric Edeline, Simon Agostini, Jacques Mériguet, Sarah Fiorini, Gérard Lacroix
The classical concepts of top-down and bottom-up cascading effects in ecosystems are challenged by the interactions between green and brown food webs. The green food web relies on photosynthesis and the brown food web relies on the mineralisation of dead organic matter. Mutualistic interactions between these two food webs are crucial for ecosystem functioning because a major fraction of organic carbon is produced by the green food web, while mineral nutrients are mainly recycled through the brown one. However, green and brown food webs can compete for mineral nutrients if decomposers are nutrient limited. Thus, bottom-up or top-down effects on one food web can have major cascading effects on the other one.
In our freshwater mesocosm experiment, we tested cascading bottom-up effects targeting the green food web through sunlight filtering and the brown food web through organic carbon addition; cascading top-down effects mediated by fish presence.
Our main finding is a positive effect of fish on phytoplankton density in mesocosms where daylight was reduced. Fish also had a positive effect on the brown food web with increased abundances of heterotrophic prokaryotes and microbial eukaryotes. However, they had no significant effect on zooplankton biomass. We did not observe any cascading effect of light treatment on the brown food web and of organic carbon treatment on the green food web. Our organic carbon treatment had nearly no effect on the brown food web.
The most likely explanation for the observed fish × light interaction is a bottom-up effect mediated by nutrient cycling embodied by the increased sediment production and DOC accumulation in the presence of fish. The lack of effect of our organic carbon treatment may be due to the moderate quantity of added carbon and of the low bioavailability of some of the added molecules.
Our experiment suggests that fish can strongly stimulate phytoplankton through bottom-up effects due to nutrient cycling, and not only through the classic trophic cascade due to the top-down control on large herbivorous zooplankton.
{"title":"Combined Effects of Fish, Light and Allochthonous Dissolved Organic Carbon on Interactions Between Green and Brown Food Webs: An Aquatic Mesocosm Experiment","authors":"Pierre Quévreux, Kejun Zou, Sébastien Barot, Élisa Thébault, Emma Rochelle-Newall, Ludwig Jardillier, Éric Edeline, Simon Agostini, Jacques Mériguet, Sarah Fiorini, Gérard Lacroix","doi":"10.1111/fwb.70081","DOIUrl":"https://doi.org/10.1111/fwb.70081","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>The classical concepts of top-down and bottom-up cascading effects in ecosystems are challenged by the interactions between green and brown food webs. The green food web relies on photosynthesis and the brown food web relies on the mineralisation of dead organic matter. Mutualistic interactions between these two food webs are crucial for ecosystem functioning because a major fraction of organic carbon is produced by the green food web, while mineral nutrients are mainly recycled through the brown one. However, green and brown food webs can compete for mineral nutrients if decomposers are nutrient limited. Thus, bottom-up or top-down effects on one food web can have major cascading effects on the other one.</li>\u0000 \u0000 \u0000 <li>In our freshwater mesocosm experiment, we tested cascading bottom-up effects targeting the green food web through sunlight filtering and the brown food web through organic carbon addition; cascading top-down effects mediated by fish presence.</li>\u0000 \u0000 \u0000 <li>Our main finding is a positive effect of fish on phytoplankton density in mesocosms where daylight was reduced. Fish also had a positive effect on the brown food web with increased abundances of heterotrophic prokaryotes and microbial eukaryotes. However, they had no significant effect on zooplankton biomass. We did not observe any cascading effect of light treatment on the brown food web and of organic carbon treatment on the green food web. Our organic carbon treatment had nearly no effect on the brown food web.</li>\u0000 \u0000 \u0000 <li>The most likely explanation for the observed fish × light interaction is a bottom-up effect mediated by nutrient cycling embodied by the increased sediment production and DOC accumulation in the presence of fish. The lack of effect of our organic carbon treatment may be due to the moderate quantity of added carbon and of the low bioavailability of some of the added molecules.</li>\u0000 \u0000 \u0000 <li>Our experiment suggests that fish can strongly stimulate phytoplankton through bottom-up effects due to nutrient cycling, and not only through the classic trophic cascade due to the top-down control on large herbivorous zooplankton.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 8","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Seasonal Shifts in the Use of Green and Brown Food Resources by a Dominant Stream Grazer","authors":"Walter R. Hill, John G. Smith","doi":"10.1111/fwb.70092","DOIUrl":"https://doi.org/10.1111/fwb.70092","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 8","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144888330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Carlota Solano-Udina, Manuel Serra, María José Carmona, Eduardo M. García-Roger
{"title":"Risk-Avoiding Strategies in Rotifer Diapause-Related Traits in Response to Environmental Unpredictability","authors":"Carlota Solano-Udina, Manuel Serra, María José Carmona, Eduardo M. García-Roger","doi":"10.1111/fwb.70093","DOIUrl":"https://doi.org/10.1111/fwb.70093","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 8","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144888329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Role of Host Age at Exposure, Host–Parasite Genetics and Host Size-Parasite Length Mechanics in Shaping the Outcome of Parasitic Infections in Three Zooplankton Taxa","authors":"Sabrina Gattis, Frida Ben-Ami","doi":"10.1111/fwb.70086","DOIUrl":"https://doi.org/10.1111/fwb.70086","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 8","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70086","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
<div> <p> </p><ol> <li>Mountains play a crucial role in global biodiversity, serving as refugia for many endemic and endangered species. This extends to high-altitude freshwater habitats, such as glacial lakes and ponds, which support unique communities of cold-adapted invertebrates. However, their remoteness, short ice-free periods and difficult accessibility pose challenges for research, leaving key ecosystem aspects poorly understood. This is particularly true for population genetic diversity and structure, which are essential for developing effective conservation strategies, especially in the context of climate change adaptation and biodiversity preservation. This study aims to (i) assess the community composition and genetic diversity and structure of aquatic beetles in the (sub)alpine lakes and ponds of the Tatra Mountains, (ii) compare these populations with conspecifics from lower elevations and (iii) evaluate the role of this mountain system in maintaining unique genetic diversity.</li> <li>Macroinvertebrate samples were collected from 215 sites, and a target barcoding fragment was amplified from ~500 aquatic beetles. Furthermore, our dataset was expanded with > 1700 sequences from the BOLD database (Barcode of Life Data Systems) and used for species delimitation with RESL, ASAP and mPTP, as well as for assessing key genetic parameters, including haplotype and nucleotide diversity, intraspecific variation and genetic differentiation. Phylogenetic relationships among haplotypes recorded within the study area were inferred using maximum likelihood analyses, and time-calibrated Bayesian phylogenies were conducted to assess cryptic taxa.</li> <li>Aquatic beetles were recorded at 106 sites, yielding 387 DNA barcodes and identifying 68 species from 27 genera and eight families. Of these, 29 species were newly recorded in the region. The expanded dataset comprised 657 haplotypes representing 106 BINs (barcode index numbers), with species delimitation yielding 81 (ASAP) and 92 (mPTP) MOTUs (molecular operational taxonomic units). For species recorded in the Tatra Mountains, approximately 75% of their globally recognised BINs/MOTUs were also present within the region, and three Linnean species were confirmed to include cryptic complexes likely originating in the Pleistocene. Notably, 68% of the 179 haplotypes found in the studied area were unique to this region, with significant genetic differentiation from non-Tatra populations, as shown by AMOVA analyses.</li> <li>The study demonstrates that highly diverse (sub)alpine lakes distributed in a geographically small area can harbour substantial species and genetic diversity and serve as important reservoirs of unique genetic diversity. These lakes likely also act as secondary contact sites for the cryptic comp
山脉在全球生物多样性中发挥着至关重要的作用，是许多特有和濒危物种的避难所。这延伸到高海拔的淡水栖息地，如冰川湖泊和池塘，它们支持独特的适应寒冷的无脊椎动物群落。然而，它们地处偏远，不结冰期短，难以进入，给研究带来了挑战，使人们对关键的生态系统方面知之甚少。对于种群遗传多样性和遗传结构而言尤其如此，它们对于制定有效的保护战略至关重要，特别是在适应气候变化和保护生物多样性的背景下。本研究旨在(i)评估塔特拉山脉（亚）高山湖泊和池塘水生甲虫的群落组成、遗传多样性和结构，（ii）将这些种群与低海拔的同种物种进行比较，（iii）评估该山地系统在保持独特遗传多样性方面的作用。从215个地点收集了大型无脊椎动物样本，并从约500只水生甲虫中扩增了目标条形码片段。此外，我们的数据集扩展了BOLD数据库（条形码of Life Data Systems）中的>； 1700个序列，并使用RESL， ASAP和mPTP进行物种划分，以及评估关键遗传参数，包括单倍型和核苷酸多样性，种内变异和遗传分化。利用最大似然分析推断研究区域内记录的单倍型之间的系统发育关系，并进行时间校准的贝叶斯系统发育来评估隐蔽分类群。水生甲虫在106个地点被记录下来，得到387个DNA条形码，鉴定出8科27属68种。其中29种为新记录种。扩展后的数据集包括657个单倍型，代表106个bin（条形码索引号），物种划分得到81个（ASAP）和92个（mPTP） motu（分子操作分类单位）。在塔特拉山脉记录的物种中，大约75%的全球公认的bin / motu也存在于该地区，并且确认了三个林奈物种包括可能起源于更新世的隐体复合体。值得注意的是，在研究地区发现的179个单倍型中，68%是该地区独有的，与非塔特拉人群存在显著的遗传分化，如AMOVA分析所示。研究表明，分布在小区域内的高多样性（亚）高寒湖泊具有丰富的物种和遗传多样性，是独特遗传多样性的重要储存库。这些湖泊也可能是本研究中发现的隐性复合物的次要接触点。相比之下，一些嗜热和泛栖物种的首次记录发现，以及一些先前报道的冷适应分类群的缺失，表明物种组成的潜在变化，可能是由气候变化驱动的。该研究对扩大区域DNA条形码文库和提高对山地淡水生态系统遗传多样性的认识具有重要意义。这些发现也与生物多样性监测工作和保护策略相关，特别是在气候变化驱动的群落组成变化的背景下，如在塔特拉山脉的一些新记录物种所证明的那样。
{"title":"High Altitudes as Reservoirs of Unique Genetic Diversity: A Case Study on Aquatic Beetles in Glacial Lakes of Tatra Mountains","authors":"Patrik Macko, Fedor Čiampor Jr, Michaela Šamulková, Ondrej Vargovčík, Kornélia Tuhrinová, Zuzana Čiamporová-Zaťovičová","doi":"10.1111/fwb.70083","DOIUrl":"https://doi.org/10.1111/fwb.70083","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Mountains play a crucial role in global biodiversity, serving as refugia for many endemic and endangered species. This extends to high-altitude freshwater habitats, such as glacial lakes and ponds, which support unique communities of cold-adapted invertebrates. However, their remoteness, short ice-free periods and difficult accessibility pose challenges for research, leaving key ecosystem aspects poorly understood. This is particularly true for population genetic diversity and structure, which are essential for developing effective conservation strategies, especially in the context of climate change adaptation and biodiversity preservation. This study aims to (i) assess the community composition and genetic diversity and structure of aquatic beetles in the (sub)alpine lakes and ponds of the Tatra Mountains, (ii) compare these populations with conspecifics from lower elevations and (iii) evaluate the role of this mountain system in maintaining unique genetic diversity.</li>\u0000 \u0000 \u0000 <li>Macroinvertebrate samples were collected from 215 sites, and a target barcoding fragment was amplified from ~500 aquatic beetles. Furthermore, our dataset was expanded with > 1700 sequences from the BOLD database (Barcode of Life Data Systems) and used for species delimitation with RESL, ASAP and mPTP, as well as for assessing key genetic parameters, including haplotype and nucleotide diversity, intraspecific variation and genetic differentiation. Phylogenetic relationships among haplotypes recorded within the study area were inferred using maximum likelihood analyses, and time-calibrated Bayesian phylogenies were conducted to assess cryptic taxa.</li>\u0000 \u0000 \u0000 <li>Aquatic beetles were recorded at 106 sites, yielding 387 DNA barcodes and identifying 68 species from 27 genera and eight families. Of these, 29 species were newly recorded in the region. The expanded dataset comprised 657 haplotypes representing 106 BINs (barcode index numbers), with species delimitation yielding 81 (ASAP) and 92 (mPTP) MOTUs (molecular operational taxonomic units). For species recorded in the Tatra Mountains, approximately 75% of their globally recognised BINs/MOTUs were also present within the region, and three Linnean species were confirmed to include cryptic complexes likely originating in the Pleistocene. Notably, 68% of the 179 haplotypes found in the studied area were unique to this region, with significant genetic differentiation from non-Tatra populations, as shown by AMOVA analyses.</li>\u0000 \u0000 \u0000 <li>The study demonstrates that highly diverse (sub)alpine lakes distributed in a geographically small area can harbour substantial species and genetic diversity and serve as important reservoirs of unique genetic diversity. These lakes likely also act as secondary contact sites for the cryptic comp","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 8","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Understanding biodiversity distribution patterns and related environmental factors and community assembly mechanisms is crucial for deciphering community responses and feedback to global changes, but it remains largely unknown in aquatic ecosystems on the Qinghai-Tibet Plateau (QTP) which is the Asian water tower and one of the regions most severely affected by climate changes.
Here, by analysing environmental DNA metagenomic and metabarcoding sequencing data of water samples from the ice margin to the lake along two endorheic rivers (Tsachu Tsangpo and Bochu Tsangpo) on the QTP, we examined the alpha and beta diversity and the ecological processes driving community assembly of various taxonomic groups (bacteria, fungi, eukaryotic algae, protozoa, metazoan invertebrates and vertebrates).
We found no significant continuous change in alpha diversity from the ice margin to lake along the two rivers for most taxonomic groups, except for fungi in Tsachu Tsangpo, which showed a gradual decline. Alpha diversity was significantly correlated with various environmental factor, including total nitrogen and ammonium nitrogen for bacteria, turbidity for fungi, total phosphorus and nitrate nitrogen for eukaryotic algae, chloride ion for protozoa and total phosphorus for metazoan invertebrates. Community compositions of these taxonomic groups were significantly correlated to similar environmental factors, such as water temperature, turbidity, nitrate nitrogen, and total organic carbon.
Furthermore, homogeneous selection, dispersal limitation and drift mainly contributed to the community assembly in both rivers, with a higher importance of deterministic processes and lower importance of stochastic processes for bacteria, eukaryotic algae and protozoa than for metazoan invertebrates and fungi.
The results demonstrated various environmental factors correlated with the alpha and beta diversity of multi-taxonomic groups in the two endorheic rivers. Deterministic processes were more prominent in the community assembly of bacteria, eukaryotic algae and protozoa than in metazoan invertebrates and fungi. These findings would help to understand how aquatic organisms on the QTP respond to climate change.
{"title":"Biodiversity and Community Assembly of Endorheic Rivers on Earth's Largest Plateau","authors":"Xiu Feng, Kai Chen, Ren Zhu, Yintao Jia, Xiaoyun Sui, Xiong Xiong, Huan Zhu, Bing Li, Huanhuan Sun, Tong Mu, Chuanqi Jiang, Wei Miao, Yifeng Chen","doi":"10.1111/fwb.70087","DOIUrl":"https://doi.org/10.1111/fwb.70087","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Understanding biodiversity distribution patterns and related environmental factors and community assembly mechanisms is crucial for deciphering community responses and feedback to global changes, but it remains largely unknown in aquatic ecosystems on the Qinghai-Tibet Plateau (QTP) which is the Asian water tower and one of the regions most severely affected by climate changes.</li>\u0000 \u0000 \u0000 <li>Here, by analysing environmental DNA metagenomic and metabarcoding sequencing data of water samples from the ice margin to the lake along two endorheic rivers (Tsachu Tsangpo and Bochu Tsangpo) on the QTP, we examined the alpha and beta diversity and the ecological processes driving community assembly of various taxonomic groups (bacteria, fungi, eukaryotic algae, protozoa, metazoan invertebrates and vertebrates).</li>\u0000 \u0000 \u0000 <li>We found no significant continuous change in alpha diversity from the ice margin to lake along the two rivers for most taxonomic groups, except for fungi in Tsachu Tsangpo, which showed a gradual decline. Alpha diversity was significantly correlated with various environmental factor, including total nitrogen and ammonium nitrogen for bacteria, turbidity for fungi, total phosphorus and nitrate nitrogen for eukaryotic algae, chloride ion for protozoa and total phosphorus for metazoan invertebrates. Community compositions of these taxonomic groups were significantly correlated to similar environmental factors, such as water temperature, turbidity, nitrate nitrogen, and total organic carbon.</li>\u0000 \u0000 \u0000 <li>Furthermore, homogeneous selection, dispersal limitation and drift mainly contributed to the community assembly in both rivers, with a higher importance of deterministic processes and lower importance of stochastic processes for bacteria, eukaryotic algae and protozoa than for metazoan invertebrates and fungi.</li>\u0000 \u0000 \u0000 <li>The results demonstrated various environmental factors correlated with the alpha and beta diversity of multi-taxonomic groups in the two endorheic rivers. Deterministic processes were more prominent in the community assembly of bacteria, eukaryotic algae and protozoa than in metazoan invertebrates and fungi. These findings would help to understand how aquatic organisms on the QTP respond to climate change.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 8","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Noelia Gobel, Gabriel Laufer, Matías Arim, Iván González-Bergonzoni
In the context of the Anthropocene, it is crucial to understand how habitat degradation and species loss alter the structure and functioning of ecological communities. Using a pondscape within the Pampas Biome as a study model, we analysed the impact of agricultural intensification on the taxonomic and trophic assemblage of pond communities.
We sampled ponds in landscapes of natural grasslands, artificial grasslands, and crop fields. Using a multitrophic approach that included zooplankton, macroinvertebrates, fish, and amphibians, we evaluated taxonomic richness, assemblage abundance, and food web structure. The trophic niche structure, energy pathways, and network topology were inferred from stable isotopes and stomach content.
Ponds in crop fields exhibited lower species richness, with significant decreases in the abundance of tadpoles, fish, and predatory macroinvertebrates, and increases in scrapers and filter-feeding macroinvertebrates indicating a severe impact of agriculture. These ponds also showed more diversity in basal resources and trophic positions but reduced trophic redundancy. Although no changes in the relative importance of trophic pathways were detected, we observed fewer primary consumers subsidised by detritus in crop-affected systems. The ponds in artificial grassland exhibited fewer alterations than those in crop fields, where environmental disruption is greater.
This study shows how land use impacts aquatic ecosystems, leading to loss of biodiversity and functional disruptions, and underscores the vulnerability of certain species and interactions to agricultural intensification.
We highlight the urgent need for targeted management to mitigate these consequences for ecosystem resilience and services, safeguard biodiversity, and preserve ecosystem functions in agricultural landscapes.
{"title":"Response of Pond Food Webs to Anthropogenic Habitat Degradation","authors":"Noelia Gobel, Gabriel Laufer, Matías Arim, Iván González-Bergonzoni","doi":"10.1111/fwb.70088","DOIUrl":"https://doi.org/10.1111/fwb.70088","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>In the context of the Anthropocene, it is crucial to understand how habitat degradation and species loss alter the structure and functioning of ecological communities. Using a pondscape within the Pampas Biome as a study model, we analysed the impact of agricultural intensification on the taxonomic and trophic assemblage of pond communities.</li>\u0000 \u0000 \u0000 <li>We sampled ponds in landscapes of natural grasslands, artificial grasslands, and crop fields. Using a multitrophic approach that included zooplankton, macroinvertebrates, fish, and amphibians, we evaluated taxonomic richness, assemblage abundance, and food web structure. The trophic niche structure, energy pathways, and network topology were inferred from stable isotopes and stomach content.</li>\u0000 \u0000 \u0000 <li>Ponds in crop fields exhibited lower species richness, with significant decreases in the abundance of tadpoles, fish, and predatory macroinvertebrates, and increases in scrapers and filter-feeding macroinvertebrates indicating a severe impact of agriculture. These ponds also showed more diversity in basal resources and trophic positions but reduced trophic redundancy. Although no changes in the relative importance of trophic pathways were detected, we observed fewer primary consumers subsidised by detritus in crop-affected systems. The ponds in artificial grassland exhibited fewer alterations than those in crop fields, where environmental disruption is greater.</li>\u0000 \u0000 \u0000 <li>This study shows how land use impacts aquatic ecosystems, leading to loss of biodiversity and functional disruptions, and underscores the vulnerability of certain species and interactions to agricultural intensification.</li>\u0000 \u0000 \u0000 <li>We highlight the urgent need for targeted management to mitigate these consequences for ecosystem resilience and services, safeguard biodiversity, and preserve ecosystem functions in agricultural landscapes.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 8","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shijie Xie, Song Peng, Yifan Wei, Wenxiang Fang, Shili Shen, Changqun Duan, Torben Linding Lauridsen, Erik Jeppesen, Ying Pan
{"title":"A Comprehensive Assessment of Heavy Metal Contamination in Chinese Lake Sediments and Submerged Macrophyte Responses: Multi-Scale Impacts, Accumulation Capacity and Tolerance Mechanisms","authors":"Shijie Xie, Song Peng, Yifan Wei, Wenxiang Fang, Shili Shen, Changqun Duan, Torben Linding Lauridsen, Erik Jeppesen, Ying Pan","doi":"10.1111/fwb.70082","DOIUrl":"https://doi.org/10.1111/fwb.70082","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 8","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70082","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144869762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Juan David Bogotá-Gregory, Leo Ohyama, Astrid Acosta-Santos, Edwin Agudelo Córdoba, David G. Jenkins
Landscapes are heavily influenced by anthropogenic activities, affecting land cover at different scales. Anthropogenic land cover affects downstream aquatic communities in the catchment area via runoff, often reducing diversity. Some landscapes are yet to be strongly influenced, such as where armed conflict has prevented human activities. Land cover in these areas may affect aquatic communities differently and serve as a reference for subsequent changes in land use.
We sampled fishes and water temperature, pH, conductivity, and dissolved oxygen at 25 localities from the lightly influenced Andean-Amazonian transition zone in Colombia when armed conflict ended. We used multivariate analysis to infer the effects of land cover on fish and water quality at three local scales (100, 500, and 1000 m radii) relative to upstream catchment land cover. We also evaluated predictors of species richness, effective diversity, and local contribution to β diversity via regressions.
Local land cover predicted fish assemblages and water quality in the relatively pristine catchment areas better than upstream catchment land cover. We provided support that local drivers of fish assemblages and water quality become dominated by anthropogenic landscape effects upstream, and the shift may be a sensitive, early indicator of anthropogenic land use on streams. Both water quality and fish assemblages showed highest local correlation with 1000 m buffers over the 100 m and 500 m buffers.
Our study represents a baseline for evaluating the effects of anthropogenic activities on relatively conserved streams. The streams from our study system serve as a model for other tropical and subtropical areas at risk of habitat transformation and degradation due to anthropogenic activities.
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