Abstract
Experiments were performed to study theindividual and combined effects of currentvelocity and substratum composition on thewaterlouse Asellus aquaticus (L.). Bothfactors affected growth, mortality, behavior,and food consumption of A. aquaticus.Short-term effects of increasing currentvelocity depended on the type of substratum. Critical currentvelocity for detachment was almost the same onsand as on a polished surface whereas on gravelA. aquaticus could withstand highercurrent velocities by hiding in interstitialspaces. Long-term experiments with differentcombinations of current velocity and substratumcomposition showed that current velocity had agreater effect than substratum on survival andgrowth. Substratum, however, had a greaterinfluence on the distribution of individuals inthe experimental units. Since growth wasreduced at high current velocity and no changesin levels of food intake were observed it isconcluded that a substantial amount of energyis required for withstanding current at higherflow rates. Furthermore, mortality showed astrong inverse correlation to growth. Theinteraction of effects of natural habitatfactors may be better understood using anexperimental and modeling approach focusing onenergy budgets.
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Peeters, E., Camu, J., Beijer, J. et al. Response of the waterlouse Asellus aquaticus to multiple stressors: effects of current velocity and mineral substratum. Journal of Aquatic Ecosystem Stress and Recovery 9, 193–203 (2002). https://doi.org/10.1023/A:1021218721123
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DOI: https://doi.org/10.1023/A:1021218721123