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Foraging modes of stream benthic fishes in relation to their predation effects on local prey density

Content Provider	Springer Nature Link
Author	Iue, Mikio Miyayoshi, Masabu Sone, Shin
Copyright Year	2004
Abstract	Habitat use and foraging behavior of two benthic insectivorous gobies, Rhinogobius sp. CO (cobalt type) and Rhinogobius sp. DA (dark type), were examined in relation to their predation effects on local prey density in a small coastal stream in southwestern Shikoku, Japan. Correlations among the foraging range, frequency of foraging attempts and current velocity indicated that individuals using fast-current habitats had small foraging ranges and infrequently made foraging attempts while those in slow currents frequently foraged over large areas. The former and the latter were recognized as ambush and wandering foragers, respectively. Interspecific comparisons of habitat use, foraging behavior and prey preference suggested that Rhinogobius sp. CO selectively forage mobile prey by ambushing in fast currents, whereas Rhinogobius sp. DA randomly forage available prey by wandering in slow-current habitats. A cage experiment was conducted to assess prey immigration rate and the degree of predation effects on local prey density in relation to current velocity. The results of the experiment support, at least in part, our initial predictions: (1) prey immigration rates increase with current velocity and (2) the effects of fish predation on local prey density are reduced as current velocity increases. Overall results illustrated a link between the foraging modes of the stream gobies and their predation effects on local prey density: fish adopt ambush foraging in fast currents, where the decrease in prey density tends to be less, whereas fish actively forage over large areas in slow currents, where the decrease in prey is relatively large.
Starting Page	151
Ending Page	161
Page Count	11
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	20
Issue Number	2
e-ISSN	14401703
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-12-07
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Benthic insectivorous fish Habitat selection Macroinvertebrate Resource partitioning Rhinogobius
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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