Increasing climate‐driven taxonomic homogenization but functional differentiation among river macroinvertebrate assemblages

Global Change Biology, Journal Year: 2020, Volume and Issue: 26(12), P. 6904 - 6915

Published: Oct. 8, 2020

Abstract Global change is increasing biotic homogenization globally, which modifies the functioning of ecosystems. While tendencies towards taxonomic in biological communities have been extensively studied, functional remains an understudied facet biodiversity. Here, we tested four hypotheses related to long‐term changes (1991–2016) and arrangement freshwater macroinvertebrate assemblages across space possible drivers these changes. Using data collected annually at 64 river sites mainland New Zealand, temporal spatial β‐diversity, contribution individual a set global, regional, catchment reach‐scale environmental descriptors. We observed long‐term, mostly climate‐induced, trends but differentiation among assemblages. These were mainly driven by replacements species traits assemblages, rather than nested loss. In addition, there was no difference between mean rate facets β‐diversity. Climatic processes governed overall population community ecosystems, amplified multiple anthropogenic, topographic change, acting widely landscape. The diversification could potentially provide with greater stability, resistance resilience capacity despite ongoing homogenization. Therefore, our study highlights need further understand trajectories both components communities, enable clearer picture how biodiversity ecosystems will respond future global

Language: Английский

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Damming affects riverine macroinvertebrate metacommunity dynamics: Insights from taxonomic and functional beta diversity

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 763, P. 142945 - 142945

Published: Oct. 14, 2020

Language: Английский

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Environmental DNA Biomonitoring Reveals the Interactive Effects of Dams and Nutrient Enrichment on Aquatic Multitrophic Communities

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(23), P. 16952 - 16963

Published: Nov. 16, 2022

Dam construction and nutrient enrichment are two pervasive stressors in rivers worldwide, which trigger a sharp decline biodiversity ecosystem services. However, the interactive effects of both on multitrophic taxonomic groups remain largely unclear. Here, we used datasets captured by environmental DNA (eDNA) approach to reveal interactions between dams aquatic communities from aspects α diversity, β food webs. First, our data showed that jointly shaped unique spatial pattern across four river systems, dissimilarity community structure significantly declined (i.e., structural homogenization) under stressors. Second, nutrients together explained 40–50% variations communities, had stronger impact fish, insects, bacteria, yet power drive protozoa, fungi, eukaryotic algae. Finally, found additive, synergistic, antagonistic were common coexisted systems led simplified webs, with decreases modularity (synergistic) robustness (additive) an increase coherence (synergistic). Overall, study highlights eDNA-based can provide perspectives for fostering understanding multiple rivers.

Language: Английский

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Loss of functionally important and regionally endemic species from streams forced into intermittency by global warming

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(11), P. 3019 - 3038

Published: Feb. 22, 2023

Climate change is altering hydrological cycles globally, and in Mediterranean (med-) climate regions it causing the drying of river flow regimes, including loss perennial flows. Water regime exerts a strong influence over stream assemblages, which have developed geological timeframes with extant regime. Consequently, sudden formerly streams expected to large, negative impacts on fauna. We compared contemporary (2016/17) macroinvertebrate assemblages that became intermittently flowing (since early 2000s) recorded same by study conducted pre-drying (1981/82) med-climate region southwestern Australia (the Wungong Brook catchment, SWA), using multiple before-after, control-impact design. Assemblage composition reaches remained changed very little between studies. In contrast, recent intermittency had profound effect species impacted drying, extirpation nearly all Gondwanan relictual insect species. New arriving at intermittent tended be widespread, resilient desert-adapted taxa. Intermittent also distinct due part differences their hydroperiods, allowing establishment winter summer longer-lived pools. The remaining only refuge for ancient relict place catchment where many these still persist. fauna SWA upland becoming homogenised wider Western Australian landscape, as drought-tolerant, widespread replace local endemics. Flow caused situ alterations assemblage demonstrates threat posed faunas climates are drying.

Language: Английский

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Functional response of fish communities in a multistressed freshwater world

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 740, P. 139902 - 139902

Published: June 15, 2020

Language: Английский

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Consideration of Multitrophic Biodiversity and Ecosystem Functions Improves Indices on River Ecological Status

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(24), P. 16434 - 16444

Published: Dec. 9, 2021

Biological quality elements have been developed worldwide to assess whether a water body is in good status or not. However, current studies mainly focus on single taxonomic group small set of species, often limited by methods morphological identification, and lack further aspects biodiversity (e.g., across taxa multiple attributes) ecosystem functions. Here, we advance framework for assessing the river's ecological based complete data measured environmental DNA (eDNA) metabarcoding measurements functions addition physicochemical large riverine system China. We identified 40 indicators functions, covering five groups from bacteria invertebrates, associated with attributes Our show that human impact ecosystems could be accurately predicted these eDNA-based using cross-validation known stressor gradient. Moreover, indices not only distinguish characteristics sites but also improve assessment accuracy 20–30% status. Overall, incorporating functional elements, multidimensional perspectives states provide additional information protect maintain rivers.

Language: Английский

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Regional, multi-decadal analysis on the Loire River basin reveals that stream temperature increases faster than air temperature

Hydrology and earth system sciences, Journal Year: 2022, Volume and Issue: 26(9), P. 2583 - 2603

Published: May 17, 2022

Abstract. Stream temperature appears to be increasing globally, but its rate remains poorly constrained due a paucity of long-term data and difficulty in parsing effects hydroclimate landscape variability. Here, we address these issues using the physically based thermal model T-NET (Temperature-NETwork) coupled with EROS semi-distributed hydrological reconstruct past daily stream streamflow at scale entire Loire River basin France (105 km2 52 278 reaches). increased for almost all reaches seasons (mean =+0.38 ∘C decade−1) over 1963–2019 period. Increases were greatest spring summer, median increase + 0.38 (range =+0.11 +0.76 ∘C) +0.44 (+0.08 +1.02 per decade, respectively. Rates increases greater than air across majority reaches. Spring summer typically southern part (up +1 largest rivers (Strahler order ≥5). Importantly, could exert joint influence on trends, where accompanied by similar trends +0.71 decreases −16 % decade−1). Indeed, reaches, positive anomalies exhibited synchrony negative streamflow, highlighting dual control exerted hydroclimatic drivers. Moreover, temperature, time series common change points occurring late 1980s, suggesting temporal coherence between changes drivers rapid response. Critically, riparian vegetation shading mitigated up 0.16 decade−1 smaller streams (i.e. < 30 km from source). Our results provide strong support basin-wide rising reduced streamflow. We suggest that some climate change-induced can through restoration maintenance forests.

Language: Английский

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Responses of macroinvertebrate functional trait structure to river damming: From within-river to basin-scale patterns

Environmental Research, Journal Year: 2023, Volume and Issue: 220, P. 115255 - 115255

Published: Jan. 9, 2023

Language: Английский

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Drivers of Macroinvertebrate Communities in Mediterranean Rivers: A Mesohabitat Approach

Sustainability, Journal Year: 2024, Volume and Issue: 16(7), P. 3075 - 3075

Published: April 7, 2024

We investigated the relationship between benthic macroinvertebrate community attributes (richness, abundance, biodiversity, and climate-specific resistance forms) physical characteristics of distinct mesohabitats (hydromorphological unit types) discretized into fast (e.g., riffles or rapids) slow pools glides) flow types in four Mediterranean rivers Spain. Key hydromorphological units, including length, width, depth, shade, substrate composition, embeddedness, abundance aquatic vegetation, density woody debris, were considered. Through a comprehensive suite multivariate analyses, we unraveled taxonomic habitat distinctions among types, with notable influence spatial proximity (greater similarity within same river basin). In coarse emerged as pivotal factors shaping assemblages, whereas fast-flowing debris most important. Contrary to remaining attributes, studied forms (absent, eggs, cocoons, cells against desiccation diapause) exhibited uniformity across despite observed variations communities, underscoring regional functional analogies biological ecological mechanisms basins. This study contributes valuable insights for anticipating repercussions ongoing climate change, particularly regions where units are more susceptible depletion during drought periods.

Language: Английский

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Loss of meltwater from glaciers and snowpack may increase synchrony of river habitats and resources in mountain watersheds

Ecology, Journal Year: 2025, Volume and Issue: 106(4)

Published: April 1, 2025

Abstract Stream biogeochemical regimes can vary over short distances in heterogenous landscapes. In many mountainous and high‐latitude watersheds, streams fed by rain groundwater sources coexist with dominated meltwater from melting glaciers, permafrost, seasonal snowpack. The distinct physicochemical of non‐meltwater promote spatial temporal asynchronies biotic abiotic environmental conditions within watersheds that ecological heterogeneity stability. However, fading cryospheric inputs to threaten homogenize synchronize stream habitats resources. Here, we compared the biomass dynamics food webs (course particulate detritus, periphyton, aquatic invertebrates, fish) a season April November four different predominant runoff, one glacier‐fed, snow‐fed, rain‐fed, transitioning glacier‐ snow‐fed rain‐fed. We then analyzed correlation (“synchrony”) these evaluated how synchrony might change if certain types were lost. found glacier‐, snow‐, rain‐fed had temperature, flow, water chemistry asynchronous patterns biofilm, invertebrate, fish biomass. strongest differences associated divergence glacier‐fed relative other types. Synchrony analysis suggests climate‐driven loss contributions cryosphere may resource during primary growing across watersheds. Increasing processes drive instream production could reduce stability as converge, especially for mobile consumers will lose opportunity integrate waves complex

Language: Английский

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