caa a22 4500 445891300 CHVBK 20180317145617.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10750-010-0500-8 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0500-8 Predation by the invasive American signal crayfish, Pacifastacus leniusculus Dana, on the invasive zebra mussel, Dreissena polymorpha Pallas: the potential for control and facilitation [Elektronische Daten] [Philine zu Ermgassen, David Aldridge] Non-indigenous crayfish often have major ecological impacts on invaded water bodies, and have contributed to the decline of native crayfish species throughout Europe. The American signal crayfish, Pacifastacus leniusculus, is the most widespread invasive crayfish in Great Britain, where the zebra mussel, Dreissena polymorpha, is similarly an invasive pest species. The potential for the American signal crayfish to regulate zebra mussel populations was investigated through a series of laboratory experiments. Crayfish were found to be highly size selective, consuming significantly more of the smallest size class of zebra mussels offered (7-12mm), over medium (16-21mm) and large (25-30mm). Crayfish feeding rate on zebra mussels was not altered when mussels were presented clumped together in natural druses compared with mussels in a disassembled druse. Crayfish spent significantly more time foraging when mussels were unattached, and a greater proportion of attacks were on medium and large than on small mussels (83% of attacks were on medium and large mussels when unattached as opposed to 47% when on druses). Individual crayfish feeding rate decreased significantly at densities of >~5 crayfishm−2. Signal crayfish are, therefore, unlikely to be able to significantly impact established populations of zebra mussels in the wild, although zebra mussels have the potential to provide crayfish with a substantial food source. Springer Science+Business Media B.V., 2010 Non-native nationallicence Exotic nationallicence Alien nationallicence Decapod nationallicence Control nationallicence zu Ermgassen Philine Aquatic Ecology Group, Department of Zoology, University of Cambridge, CB2 3EJ, Cambridge, UK aut Aldridge David Aquatic Ecology Group, Department of Zoology, University of Cambridge, CB2 3EJ, Cambridge, UK aut Hydrobiologia Springer Netherlands 658/1(2011-01-01), 303-315 0018-8158 658:1<303 2011 658 10750 https://doi.org/10.1007/s10750-010-0500-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0500-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- zu Ermgassen Philine Aquatic Ecology Group, Department of Zoology, University of Cambridge, CB2 3EJ, Cambridge, UK aut NATIONALLICENCE 700 1- Aldridge David Aquatic Ecology Group, Department of Zoology, University of Cambridge, CB2 3EJ, Cambridge, UK aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 658/1(2011-01-01), 303-315 0018-8158 658:1<303 2011 658 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer