Abstract:
: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.
journal_name
Oecologiajournal_title
Oecologiaauthors
Englund G,Johansson F,Olsson TIdoi
10.1007/BF00317841subject
Has Abstractpub_date
1992-12-01 00:00:00pages
498-502issue
4eissn
0029-8549issn
1432-1939pii
10.1007/BF00317841journal_volume
92pub_type
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