A comparison of biotic groups as dry-phase indicators of ecological quality in intermittent rivers and ephemeral streams

Ecological Indicators, Journal Year: 2018, Volume and Issue: 97, P. 165 - 174

Published: Oct. 12, 2018

Intermittent rivers and ephemeral streams (IRES) are dynamic ecosystems that shift between aquatic terrestrial states. IRES widespread, abundant increasing in extent, but developing biomonitoring programmes to determine their ecological quality is challenging. To date, assessments have focused on the organisms present during wet phases, whereas dry-phase communities remain poorly characterized. We examined multiple biotic groups dry channels, compare assemblages at sites impacted unimpacted by human activity evaluate potential of each group as an indicator. explored existing, unpublished data for three groups: microflora (diatoms), fauna (the invertebrate 'seedbank'), a mixed flora (aquatic plants); notably, we did not source with high act indicators. Diatom plant assemblage composition differed sites, latter were more diverse included indicator taxa. Invertebrate seedbank taxa richness was higher compositional differences detected, probably due coarse taxonomic resolution which identified. Performance standard indices variable, identified conditions all groups. Our results can inform enhancement designed characterize relation legislative targets. highlight need integrate wet- survey holistic assessments. Although suggest diatoms, plants having assessment quality, research further these and, crucially, explore

Language: Английский

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Environmental filtration and dispersal limitation explain different aspects of beta diversity in desert plant communities

Global Ecology and Conservation, Journal Year: 2021, Volume and Issue: 33, P. e01956 - e01956

Published: Dec. 14, 2021

Environmental filtration and spatial processes are associated with variation in ecological communities biodiversity; however, their relative importance to species beta diversity at different sampling scales has not been fully explored desert plant communities. We examined the contribution of environmental factors its components Ebinur Lake Basin through variance partitioning multivariate analysis. Our results suggested that component values decreased increase scale. Differences contributions two were observed. dispersal limitation explain on scales, as well components: for a greater impact small medium while plays dominant role large scale; components, filtering better explained total turnover, had effect nestedness. study further confirmed quantitative evaluation pattern formation driving forces diversity. Moreover, it emphasized necessity integrating multiple aggregate community biodiversity studies.

Language: Английский

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Effects of climate, spatial and hydrological processes on shaping phytoplankton community structure and β-diversity in an estuary-ocean continuum (Amazon continental shelf, Brazil)

Journal of Sea Research, Journal Year: 2023, Volume and Issue: 193, P. 102384 - 102384

Published: May 6, 2023

This study investigated the influence of estuarine plume from Maranhense Gulf on phytoplankton community structure and β-diversity. To understand effects regulation mechanisms shaping β-diversity along an estuary-ocean continuum in eastern sector Amazon shelf, this considered spatiotemporal analyses physical, chemical, biological variables May 2019 to June 2020. High temporal environmental heterogeneity was identified Cumã Bay significant spatial variability continuum. Based thermohaline properties, observed alongshore at a distance approximately 60 km coastline. Both varied time space. From 189 taxa, thirty-nine indicator species were selected based their functional traits value. Skeletonema costatum best water influence. Turnover main component responsible for boosting scales. The present first performed which applied diversity metrics (β-diversity) generate new information about loss taxon richness provided important changes heterogeneity.

Language: Английский

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Water‐controlled ecosystems as complex networks: Evaluation of network‐based approaches to quantify patterns of connectivity

Ecohydrology, Journal Year: 2024, Volume and Issue: 17(7)

Published: July 10, 2024

Abstract This study provides a new perspective on understanding the intricacies of water‐mediated connectivity in ecosystems, bridging landscape ecology and geomorphology through network science. We highlight dryland river‐floodplain ecosystems as distinct examples contrasting water‐controlled systems. (1) discuss central considerations developing structural functional networks connectivity; (2) quantify emergent patterns these networks; (3) evaluate capacity science tools for investigating characteristics. With focus strength (weights) direction, is quantified using seven parameters at both node levels. find that link density, betweenness centrality page rank are highly sensitive to directionality; global efficiency degree particularly weights; relative remains unaffected by weights directions. Our underscores how approaches can transform we understand connectivity, especially consideration role(s) directionality. interdisciplinary perspective, linking ecology, hydrology geomorphology, has implications theoretical insights practical applications environmental management conservation efforts.

Language: Английский

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Habitat Fragmentation and Metapopulation, Metacommunity, and Metaecosystem Dynamics in Intermittent Rivers and Ephemeral Streams

Elsevier eBooks, Journal Year: 2017, Volume and Issue: unknown, P. 377 - 403

Published: Jan. 1, 2017

Language: Английский

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