Publikation: Larval fish in troubled waters - is the behavioural response of larval fish to hydrodynamic impacts active or passive?
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In a mesocosm experiment, we tested whether larval fish show an active behavioural response to hydrodynamic impacts. Exposing 1- to 3-week-old allis shad (Alosa alosa) larvae to a pulsed wave regime, we found that already 1-weekold larvae immediately adapt their microhabitat use and activity patterns at the onset of the wave pulses. The fish larvae instantaneously increased their activity level and moved downwards, concentrating in the calmer lower third of the water column. Within 4 min after the end of the wave pulse, the fish returned to their former distribution. Two- and 3-week-old fish larvae foraged close to the bottom substratum during calm periods but avoided this zone during the wave pulses. Thus, larval fish show an active response to hydrodynamic impacts. With the ability to adjust microhabitat use and activity level, already fish larvae are able to trade costs and benefits associated with spatio-temporal hydrodynamic heterogeneity. In particular, fish larvae should be able to minimize some of the harmful effects of navigation-induced waves where calmer evasion habitats are available.
Zusammenfassung in einer weiteren Sprache
Résumé : Dans le cadre d’une expérience en mésocosme, nous avons évalué si des larves de poisson montrent une réponse comportementale active à des impacts hydrodynamiques. Des larves d’alose (Alosa alosa) âgées d’une à trois semaines ont été exposées à un régime de vagues pulsées. Nous avons observé que les larves d’une semaine adaptent immédiatement leurs patrons d’utilisation de l’habitat et d’activité dès le début des pulsations. Les larves ont ainsi augmenté instantanément leur niveau d’activité et se sont déplacées vers le bas, s’agglomérant dans le tiers le plus calme de la colonne d’eau. Dans les 4 min suivant la fin des ondes pulsées, les poissons avaient repris leur réparation initiale. Les larves de poisson de deux et trois semaines se nourrissaient près du substrat inférieur durant les périodes calmes, mais évitaient cette zone durant les pulsations. Les larves de poisson réagissent donc activement à des impacts hydrodynamiques. Cette capacité d’ajuster leur utilisation de microhabitats et leur niveau d’activité leur permet déjà de trouver un compromis entre les coûts et avantages associés à une hétérogénéité hydrodynamique spatiotemporelle. Plus particulièrement, les larves de poisson devraient être en mesure de minimiser certains des effets néfastes des vagues induites par la navigation là où des habitats d’évasion plus calmes
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STOLL, Stefan, Peter BEECK, 2012. Larval fish in troubled waters - is the behavioural response of larval fish to hydrodynamic impacts active or passive?. In: Canadian Journal of Fisheries and Aquatic Sciences. 2012, 69(10), pp. 1576-1584. ISSN 0706-652X. eISSN 1205-7533. Available under: doi: 10.1139/f2012-086BibTex
@article{Stoll2012Larva-20773,
year={2012},
doi={10.1139/f2012-086},
title={Larval fish in troubled waters - is the behavioural response of larval fish to hydrodynamic impacts active or passive?},
number={10},
volume={69},
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journal={Canadian Journal of Fisheries and Aquatic Sciences},
pages={1576--1584},
author={Stoll, Stefan and Beeck, Peter}
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