The geography of metapopulation synchrony in dendritic river networks

Ecology Letters, Journal Year: 2021, Volume and Issue: 24(4), P. 791 - 801

Published: Feb. 22, 2021

Abstract Dendritic habitats, such as river ecosystems, promote the persistence of species by favouring spatial asynchronous dynamics among branches. Yet, our understanding how network topology influences metapopulation synchrony in these ecosystems remains limited. Here, we introduce concept fluvial synchrogram to formulate and test expectations regarding geography across watersheds. By combining theoretical simulations an extensive fish population time‐series dataset Europe, provide evidence that metapopulations can be buffered against synchronous a direct consequence connectivity branching complexity. Synchrony was higher between populations connected water flow decayed faster with distance over Euclidean than watercourse dimension. Likewise, headwater mainstem same basin. As directionality generate fundamental patterns metapopulations, empirical synchrograms aid knowledge advancement inform conservation strategies complex habitats.

Language: Английский

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Analyzing the critical locations in response of constructed and planned dams on the Mekong River Basin for environmental integrity

Environmental Research Communications, Journal Year: 2022, Volume and Issue: 4(10), P. 101001 - 101001

Published: Sept. 22, 2022

Abstract Massive hydropower dams in the Mekong river basin ( MRB ) have triggered substantial debate and international attention due to its utmost importance on maintaining ecology biodiversity. Although numerous studies been conducted assess consequences of existing proposed dams, combined effects biodiversity ecosystems received limited attention. In this study, we focused dam’s locations suitability overall River Network order comprehend environmental ecological integrity as a whole. Overall, identified harmful their associated sub-basins based notion connectivity. The vulnerability is well recognized, our findings generally provide additional theoretical support for protection.

Language: Английский

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Spatio-temporal patterns of multi-trophic biodiversity and food-web characteristics uncovered across a river catchment using environmental DNA

Communications Biology, Journal Year: 2022, Volume and Issue: 5(1)

Published: March 23, 2022

Abstract Accurate characterisation of ecological communities with respect to their biodiversity and food-web structure is essential for conservation. However, combined empirical study multi-trophic food webs at a large spatial temporal resolution has been prohibited by the lack appropriate access such data from natural systems. Here, we assessed characteristics across 700 km 2 riverine network over seasons using environmental DNA. We found contrasting patterns between major taxonomic groups. Local richness showed statistically significant, season-dependent increases decreases towards downstream location within catchment fish bacteria, respectively. Meanwhile, invertebrate remained spatially unchanged but varied seasons. The local webs, as link density nestedness, also space time. these did not necessarily mirror those observed functional feeding characteristics. Our results suggest that dynamics are directly scalable each other even same scales. In order conserve species diversity well trophic integrity communities, must thus be jointly studied.

Language: Английский

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Destabilizing Effects of Environmental Stressors on Aquatic Communities and Interaction Networks across a Major River Basin

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(20), P. 7828 - 7839

Published: May 8, 2023

Human-driven environmental stressors are increasingly threatening species survival and diversity of river systems worldwide. However, it remains unclear how the affect stability changes across aquatic multiple communities. Here, we used DNA (eDNA) data sets from a human-dominated in China over 3 years analyzed communities under persistent anthropogenic stressors, including land use pollutants. First, found that significantly reduced multifaceted (e.g., richness, Shannon's diversity, Simpson's diversity) but increased synchrony Second, structures interaction networks inferred an empirical meta-food web were changed for example, resulting decreased network modularity negative/positive cohesion. Third, piecewise structural equation modeling proved stress-induced decline mainly depended upon diversity-mediated pathways rather than direct effects stress per se; specifically, increase main biotic drivers variation. Overall, our study highlights destabilizing on as well mechanistic dependencies, through reducing increasing synchrony, changing networks.

Language: Английский

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Scales matter: regional environment factors affect α diversity but local factors affect β diversity of macroinvertebrates in Thousand Islands Lake catchment area

Ecological Indicators, Journal Year: 2024, Volume and Issue: 158, P. 111561 - 111561

Published: Jan. 1, 2024

A more profound comprehension of various facets biodiversity is essential for advancing sustainable governance and its associated ecosystem services. In this study, we delved into the composition beta diversity within macroinvertebrates communities in Thousand Islands Lake catchment area. Subsequently, investigated factors influencing diverse alpha diversity, ultimately employed structural equation modeling to analyze pathways through which both regional environmental factors, like climate land use, local variables collectively impact distinct ecosystem. Our results showed that (i) taxonomic phylogenetic diversities were primarily determined by turnover, while functional predominantly nestedness; (ii) are influenced spatial variables, with environment ranking second, use explaining lowest proportion according variance partitioning; (iii) mainly affected especially climatic (precipitation) hydrological (depth) revealed modeling. These offer compelling evidence composition, ecological drivers, specific influence vary across different scales. Future studies could focus on as well consider effects at scales, would provide new insights potential patterns community associations.

Language: Английский

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