Comparison of the propensity to drift for three invertebrate taxa: a laboratory study

Autor:	Elorri Arevalo, Agnès Bardonnet, Margaret Lang, Aitor Larrañaga, Etienne Prévost
Přispěvatelé:	Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP), Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA), Lab of Stream Ecology, Dept. of Plant Biology and Ecology, University of the Basque Country (University of the Basque Country), Environmental Resources Engineering, Humboldt State University (HSU), E. Arevalo benefits from a cross-border grant (Univ Pau & Pays Adour/UPV) and from Me´rime´e, a programme funded by the French Embassy. Experiments were carried out thanks to the IE ECP facilities and financially supported by CG64 and INRA Ecoserv Metaprogram
Rok vydání:	2019
Předmět:	0106 biological sciences substrate size taille Zoology invertebrate size Aquatic Science water velocity invertébré aquatique 010603 evolutionary biology 01 natural sciences flow velocity aquatic invertebrate Simulium ComputingMilieux_MISCELLANEOUS Invertebrate Larva biology 010604 marine biology & hydrobiology Community structure Baetis Interspecific competition biology.organism_classification Substrate (marine biology) dérive Environmental science vitesse du courant Chironomus substrat [SDE.BE]Environmental Sciences/Biodiversity and Ecology saison season
Zdroj:	Hydrobiologia Hydrobiologia, Springer, 2019, 830 (1), pp.243-254. ⟨10.1007/s10750-018-3870-y⟩
ISSN:	1573-5117 0018-8158
DOI:	10.1007/s10750-018-3870-y
Popis:	International audience; Invertebrate drift is an important ecological process but factors affecting the downstream transport of invertebrates are difficult to assess. The influence of water velocity on drift entry rates is still unclear and has rarely been quantified. In this study, conducted in spring and autumn, we investigated the drift propensity for different sizes of Baetis, Simulium and Chironomus larvae which, over a 24-h period, were subjected to low, moderate or high water velocities (14, 30 and 40 cm s-1, respectively) in either fine or coarse gravel beds. Interspecific differences were detected: Baetis drifted the most, Chironomus showed intermediate values and Simulium drifted the least. Chironomus was the only taxon that responded to water velocity. Baetis and Simulium were only slightly constrained to drift by the experimental conditions, while, in contrast, Chironomus larvae were very sensitive to flow increase. Substrate size (fine/coarse gravel bed) had no effect on any taxa. Small Simulium and Chironomus drifted more than larger ones. A seasonal effect was also detected, with Baetis drifting more in fall and Simulium drifting more in spring. Results suggest that community structure may be as or more important than hydraulics as a determinant of drift rates.
Databáze:	OpenAIRE
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