Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 496127
Title Effects of osmotic stress on predation behaviour of Asterias rubens L.
Author(s) Aguera Garcia, Antonio; Schellekens, Tim; Jansen, J.M.; Smaal, A.C.
Source Journal of Sea Research 99 (2015). - ISSN 1385-1101 - p. 9 - 16.
DOI http://dx.doi.org/10.1016/j.seares.2015.01.003
Department(s) Aquaculture and Fisheries
IMARES Delta
Servicedesk
IMARES Onderzoeksformatie
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) Mussels - Osmotic stress - Predator-prey interaction - Prey selection - Starfish
Abstract

Environmental stress plays an important role in determining ecosystem functioning and structure. In estuarine areas both tidal and seasonal salinity changes may cause osmotic stress on predators, affecting their behaviour and survival. The interaction between these predators and their prey may affect performance, thus influencing predator impact on prey populations. The common starfish, Asterias rubens, inhabits estuarine areas, such as the Dutch Wadden Sea, that exhibit large seasonal variation in salinity (10-32 PSU). In those areas A. rubens exerts top down control on its prey, thus representing an important shellfish predator. This predation may impact on cultured and natural shellfish populations. However, the effects of osmotic stress on A. rubens performance may influence its effect on prey. Although the effect of salinity in A. rubens survival has been extensively studied, the impact on its predation behaviour and acclimation capacity remains unclear. In this study, we analyse the performance of A. rubens preying on mussels (Mytilus edulis) after a salinity decrease and monitor its acclimation capacity over a period of 22. days. Our experiments demonstrated that salinity affected performance by reducing feeding activity and altering size prey selection. Moreover, as acclimation occurred, A. rubens predation performance improved in all sub-lethal treatments. We conclude that osmotic stress caused by decreasing salinity potentially influences A. rubens distribution, abundance, and potential impact on prey populations. However the magnitude of the change in salinity (from 31 to a minimum of 10. PSU) and its timescale (3. weeks) mediate this effect. However acclimation occurred.

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