caa a22 4500 465781837 CHVBK 20180323111957.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00174023 doi (NATIONALLICENCE)springer-10.1007/BF00174023 Differential predation by males on moulted females may explain the competitive displacement of Gammarus duebeni by G. pulex (Amphipoda) [Elektronische Daten] [Jaimie Dick, Donna Irvine, Robert Elwood] Summary: Several studies have reported the ability of Gammarus pulex to successfully compete with and ultimately displace G. duebeni in freshwater. These studies have been unable, however, to provide adequate explanations for this displacement based on mechanisms of exploitative competition and/or differences in the environmental tolerances of the species. The present study investigates the role of predation as an extreme form of interference competition between G. pulex and G. duebeni. The data presented show that: (1) given the opportunity, males of both species prey on females of the other species, but only on females that have recently moulted; (2) mate guarding in both species significantly reduces the incidence of predation on moulted females; (3) mate guarding by male G. pulex is more successful in reducing predation on moulted females than is guarding by male G. duebeni. We propose that differential predation rate on moulted females may constitute the primary mechanism by which G. pulex displaces G. duebeni. Springer-Verlag, 1990 Dick Jaimie Department of Biology, The Queen's University of Belfast, BT7, 1NN, Belfast, Northern Ireland aut Irvine Donna Department of Biology, The Queen's University of Belfast, BT7, 1NN, Belfast, Northern Ireland aut Elwood Robert Department of Biology, The Queen's University of Belfast, BT7, 1NN, Belfast, Northern Ireland aut Behavioral Ecology and Sociobiology Springer-Verlag 26/1(1990-01-01), 41-45 0340-5443 26:1<41 1990 26 265 https://doi.org/10.1007/BF00174023 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00174023 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dick Jaimie Department of Biology, The Queen's University of Belfast, BT7, 1NN, Belfast, Northern Ireland aut NATIONALLICENCE 700 1- Irvine Donna Department of Biology, The Queen's University of Belfast, BT7, 1NN, Belfast, Northern Ireland aut NATIONALLICENCE 700 1- Elwood Robert Department of Biology, The Queen's University of Belfast, BT7, 1NN, Belfast, Northern Ireland aut NATIONALLICENCE 773 0- Behavioral Ecology and Sociobiology Springer-Verlag 26/1(1990-01-01), 41-45 0340-5443 26:1<41 1990 26 265 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer