Upstream migration of anadromous and potamodromous brown trout: patterns and triggers in a 25-year overview

Autor: Juan Francisco Fuentes-Pérez, Ana García-Vega, José Ardaiz Ganuza, Francisco Javier Sanz-Ronda, Pedro M. Leunda Urretabizkaia
Rok vydání: 2021
Předmět:
Zdroj: UVaDOC. Repositorio Documental de la Universidad de Valladolid
instname
ISSN: 1573-5117
0018-8158
2018-0101
Popis: Producción Científica
River fragmentation and alterations in flow and thermal regimes are the main stressors affecting migrating fish, which could be aggravated by climate change and increasing water demand. To assess these impacts and define mitigation measures, it is vital to understand fish movement patterns and the environmental variables affecting them. This study presents a long-term (1995–2019) analysis of upstream migration patterns of anadromous and potamodromous brown trout in the lower River Bidasoa (Spain). For this, captures in a monitoring station were analyzed using Survival Analysis and Random Forest techniques. Results showed that most upstream movements of potamodromous trout occurred in October–December, whereas in June–July for anadromous trout, although with differences regarding sex and size. Both, fish numbers and dates varied over time and were related to the environmental conditions, with different influence on each ecotype. The information provided from comparative studies can be used as a basis to develop adaptive management strategies to ensure freshwater species conservation. Moreover, studies in the southern distribution range can be crucial under climate warming scenarios, where species are expected to shift coldwards.
Proyecto de innovación docente de la Universidad de Valladolid (PIF-UVa 2017)
Ministerio de Ciencia, Innovación y Universidades (grant PTQ2018-010162)
Publicación en abierto financiada por el Consorcio de Bibliotecas Universitarias de Castilla y León (BUCLE), con cargo al Programa Operativo 2014ES16RFOP009 FEDER 2014-2020 DE CASTILLA Y LEÓN, Actuación:20007-CL - Apoyo Consorcio BUCLE
Databáze: OpenAIRE
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