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Competition for food between an introduced crayfish and two fishes endemic to the Colorado River basin

Environmental Biology of Fishes

By:
https://doi.org/10.1007/s10641-004-2588-z

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Abstract

Crayfish are not native to the Colorado River basin (CRB), however they are now established in portions of the mainstem and in many tributaries. I used density manipulation experiments in a laboratory setting to determine intra- and interspecific competition for food between Orconectes virilis, an aggressive polytrophic crayfish now common in the CRB, and two native fishes: Gila chub, Gila intermedia, and flannelmouth sucker, Catostomus latipinnis. I tested each fish species in separate trials. Growth of Gila chub decreased when animal densities increased, however they were more affected by intraspecific competition than by crayfish presence. In contrast, growth of flannelmouth suckers was more affected by crayfish than by intraspecific competition. Crayfish growth was not significantly altered by presence of either fish. Crayfish thus reduced fish growth by competition for food, but the effect differed markedly between the two species.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Competition for food between an introduced crayfish and two fishes endemic to the Colorado River basin
Series title:
Environmental Biology of Fishes
DOI:
10.1007/s10641-004-2588-z
Volume:
72
Issue:
3
Year Published:
2005
Language:
English
Publisher:
Springer
Contributing office(s):
Fort Collins Science Center
Description:
8 p.
First page:
335
Last page:
342