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Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
Published on: July 30, 2019
Modelling stream-fish functional traits in reference conditions: regional and local environmental correlates
João M Oliveira1, Pedro Segurado, José M Santos
1Centro de Investigação e de Tecnologias Agro-Ambientais e Biológicas (CITAB), Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal. jmoliveira@utad.pt
Environmental gradients significantly influence fish assemblage structure in western Iberia streams. Regional factors like elevation and rainfall are key drivers, necessitating a multi-scale approach for effective river management and biomonitoring.
Area of Science:
- Ecology
- Freshwater Biology
- Environmental Science
Background:
- Understanding environmental influences on aquatic ecosystems is crucial for effective river management.
- Identifying factors structuring biological assemblages in undisturbed rivers aids in predicting impacts of human activities.
Purpose of the Study:
- To investigate the role of regional and local abiotic gradients in shaping fish assemblage functional structure.
- To model fish metrics (guild density, species richness) in western Iberia streams.
Main Methods:
- Utilized generalized linear models to analyze fish metrics from 117 least disturbed stream reaches.
- Assessed the influence of regional (catchment elevation, slope, rainfall, drainage area) and local-scale abiotic factors.
Main Results:
- Fish assemblage functional patterns were primarily linked to regional features.
- Observed significant latitudinal patterns influenced by climate and topography.
- Found upstream-downstream patterns related to stream position, with peak native species richness in midsize streams.
Conclusions:
- A multi-scale approach is essential for understanding functional organization in natural streams.
- Findings support improving biomonitoring and restoration strategies for fluvial ecosystems.
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