caa a22 4500 469096225 CHVBK 20180323133031.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF00317841 doi (NATIONALLICENCE)springer-10.1007/BF00317841 Asymmetric competition between distant taxa: poecilid fishes and water striders [Elektronische Daten] [Göran Englund, Frank Johansson, Tommy Olsson] Summary: Competition for water surface prey between fish (Priapichtus annectens: Poeciliidae) and water striders (Potamobates unidentatus: Gerridae) was studied in the laboratory and in pools in a small tropical stream. Laboratory experiments showed that fish depressed activity and foraging success of water striders. Large fish (4-5 cm) had a greater effect than small fish (2-3 cm). The field experiment showed that competition was highly asymmetric. Presence of fish decreased water strider foraging success while the reverse interaction was insignificant. It is suggested that the higher individual foraging success of the fish, harassment of water striders by fish and the use of an exclusive resource, benthic invertebrates, by the fish, contribute to this pattern. Habitat use differed between the two species. Fish used the deeper parts of stream pools and water striders used the shallower parts of the pools. Asymmetric interference and exploitation competition may force water striders to use shallow edge habitats. Springer-Verlag, 1992 Asymmetric competition nationallicence Distantly related taxa nationallicence Foraging nationallicence Drift feeders nationallicence Interference competition nationallicence Englund Göran Department of Animal Ecology, University of Umeå, S-901 87, Umeå, Sweden aut Johansson Frank Department of Animal Ecology, University of Umeå, S-901 87, Umeå, Sweden aut Olsson Tommy Department of Animal Ecology, University of Umeå, S-901 87, Umeå, Sweden aut Oecologia Springer-Verlag 92/4(1992-12-01), 498-502 0029-8549 92:4<498 1992 92 442 https://doi.org/10.1007/BF00317841 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317841 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Englund Göran Department of Animal Ecology, University of Umeå, S-901 87, Umeå, Sweden aut NATIONALLICENCE 700 1- Johansson Frank Department of Animal Ecology, University of Umeå, S-901 87, Umeå, Sweden aut NATIONALLICENCE 700 1- Olsson Tommy Department of Animal Ecology, University of Umeå, S-901 87, Umeå, Sweden aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 92/4(1992-12-01), 498-502 0029-8549 92:4<498 1992 92 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer