Please use this identifier to cite or link to this item: http://hdl.handle.net/10174/13645

Title: Fish response to anthropogenic pressures in temporary streams: the importance of environmental drivers.
Authors: Matono, Paula
Bernardo, João Manuel
Ilhéu, Maria
Editors: Ilhéu, Maria
Bernardo, João
Arthington, Angela
Keywords: fish assemblage stability
natural and anthropogenic disturbance
Mediterranean-type streams
large-scale natural environmental factors
intermittency
Issue Date: Dec-2014
Publisher: River Research and Applications/John Wiley & Sons, Ltd .
Citation: Matono P, Bernardo JM, Costa AM, Ilhéu M. 2014. Fish response to anthropogenic pressures in temporary streams: the importance of environmental drivers. River Research and Applications DOI: 10.1002/rra.2780.
Abstract: Mediterranean temporary streams show high spatial and temporal heterogeneity. Native fish species are adapted to this natural variability, but the cumulative effect of natural and anthropogenic disturbances may compromise the stability and persistence of fish assemblages. This study aimed to determine if environmental drivers affect the response of fish assemblages to anthropogenic pressures in temporary streams and identify what type of fish assemblages are articularly vulnerable to anthropogenic disturbance. Data were collected from 22 sites located in southern Portuguese temporary streams between 1996 and 2012. The temporal pattern of fish assemblages in each site was used to examine fish assemblage stability, that is, the relative constancy of species abundance over time, quantified using the Bray–Curtis similarity coefficient. Native fish assemblage stability was positively associated with altitude, annual rainfall, percentage of riffles and habitat diversity and highly negatively related to nthropogenic pressure, particularly land use intensification, riparian degradation, sediment load and organic contamination/nutrient enrichment. Results highlighted an interaction between natural environmental and anthropogenic pressure gradients; anthropogenic disturbance tends to be lower in high-elevation headwater streams and increases in lowland streams,particularly in downstream reaches. In upstream reaches, especially in lowland streams, fish assemblage stability showed a steep decline with the increase in anthropogenic pressure. Lowland downstream reaches displayed a less steep decline of fish assemblage stability in response todegradation, despite having greater anthropogenic disturbance. The results highlight the particular vulnerability of headwater streams in lowland sectors to anthropogenic disturbance.
URI: http://hdl.handle.net/10174/13645
Type: article
Appears in Collections:PAO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
ICAAM - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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