NDLI: Behavioral effects of invaders: alien crayfish and native sculpin in a California stream

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Biological Invasions : Volume 7, Issue 2, March 2005

Biological Invasions : Volume 7, Issue 1, March 2005

Biological Invasions : Volume 6

Biological Invasions : Volume 5

Biological Invasions : Volume 4

Biological Invasions : Volume 3

Biological Invasions : Volume 2

Biological Invasions : Volume 1

Behavioral effects of invaders: alien crayfish and native sculpin in a California stream

Content Provider	Springer Nature Link
Author	Light, Theo
Copyright Year	2005
Abstract	Invasive crayfish have been shown to have negative impacts on a range of taxa, though the mechanisms for those effects have not always been evaluated. Signal crayfish (Pacifastacus leniusculus) in Sagehen Creek were associated with reduced growth rates and gut fullness of Paiute sculpin (Cottus beldingi) in earlier experiments. This paper assesses potential behavioral mechanisms of competition between the two species. I conducted experiments to determine crayfish effects on sculpin behavior and habitat use in a stream observation facility at the Sagehen Research Station, California, USA. Sculpin reduced their use of refuges and pools, shifted into higher-velocity microhabitats, and spent more time fleeing in the presence of crayfish. Crayfish used refuges, pools, and low-velocity habitats more than sculpin in either treatment. Both species were notably nocturnal, with most activity at dusk and night observations, although crayfish were more strongly so than sculpin. Detailed field surveys of lower Sagehen Creek found that potential refuges (unembedded rocks) were closely associated with total crayfish and sculpin numbers, suggesting that cover is at least sometimes limiting under natural conditions. By displacing sculpin from refuges and pools and increasing their activity rate, crayfish may increase the likelihood of predation on sculpin. Behavioral shifts in sculpin appear to be at least partly responsible for the reduced growth rates of sculpin in the presence of crayfish.
Starting Page	353
Ending Page	367
Page Count	15
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	7
Issue Number	3
e-ISSN	15731464
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	behavior competition Cottus beldingi crayfish fish invasion impacts interphyletic competition introduced species Pacifastacus leniusculus refuge use streams (California, USA) Ecology Hydrobiology Forestry Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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