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Communication Dans Un Congrès Année : 2015

Selectivity of water obstacles on glass eel migration wave

Sélectivité des obstacles aquatiques sur la migration des civelles

Résumé

Physical obstacles to upstream migration such as dams are a major impairment of natural colonisation and dispersion of migratory fish such as eels. Dams and obstacles increase fish energy expenditure, even when they are equipped with fish friendly devices. Besides, local accumulation of eels below dams increase the mortality associated with predation. Obstacles may also select on different traits of life history. While quantitative impact of dams is subjected to numerous studies, little is known about their intra-specific selectivity. Even the fishway efficiency analyses are scarcely hinting at their potential selective effect (Castro-Santos 2004; Noonan, Grant & Jackson 2012). The objective of this study was to pinpoint phenotypic traits predisposing glass eels to dams successful passage. In a preliminary approach we measured the transcription level of 15000 known eel genetic sequences in three main tissues (brain, liver and muscle) from wild individuals sampled on three successive river segments separated by dams. Interestingly, whereas no significant difference was observed in muscle and liver, segment-specific gene expression profiles were observed in brain. Surprisingly, the set of regulated genes was involved in synaptic plasticity, associated with animal cognition. In this study, by means of qPCR analysis of targeted genes, behavioral tests on experimental fishway and common garden experiment, the objective was to give insight into how genes related to learning and memory are associated with climbing behavior of fish.
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Dates et versions

hal-02602314 , version 1 (16-05-2020)

Identifiants

Citer

T. Podgorniak, F. Pierron, Eduardo Henrique de Oliveira, Françoise Daverat. Selectivity of water obstacles on glass eel migration wave. 39th Annual Larval Fish Conference, Jul 2015, Vienne, Austria. pp.27. ⟨hal-02602314⟩
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