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The Effects of Starvation on Crayfish Responses to Alarm Odor
Author(s) -
Hazlett Brian A.
Publication year - 2003
Publication title -
ethology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.739
H-Index - 74
eISSN - 1439-0310
pISSN - 0179-1613
DOI - 10.1046/j.1439-0310.2003.00902.x
Subject(s) - odor , alarm , crayfish , starvation , biology , alarm signal , predator , zoology , ecology , predation , endocrinology , neuroscience , materials science , composite material
The effect of starvation on responses to alarm odor was tested with individuals of an invasive and a native species of crayfish. I predicted that chemical predator cues would inhibit feeding less in starving than well‐fed animals, and that this decrease would be stronger in a native compared with an invasive species. Individuals were exposed to food odor and then alarm odor after 3 and 10 d of starvation. The inhibition of food‐related behavior patterns was similar on the 2 d of testing for individuals of the invasive species, Orconectes rusticus . Individuals of O. virilis showed a significant reduction in the effects of alarm odor detection on day 10 compared with day 3 of starvation. The lack of a change in responses to alarm odors between days of testing by individuals of O. rusticus may be because they are more responsive to alarm odors than individuals of O. virilis . This behavioral difference could contribute to the successful range extension of O. rusticus .