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Animal Behaviour
Volume 31, Issue 2, May 1983, Pages 424-430
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Copyright © 1983 Published by Elsevier Ltd.

Temperature-dependent behaviours and cluster formation by aggregating ladybird beetles
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Newton H. Coppa

aJoint Sciences Department, The Claremont Colleges, Claremont, CA 91711, U.S.A.

Received 1 June 1982; 
revised 7 July 1982. 
MS. number: a2878. 
Available online 3 June 2006.


At their winter aggregation sites, convergent ladybird beetles, Hippodamia convergens (Coccinellidae), become active during snow-free days but form dense clusters in protected microhabitats at night. This daily dispersal and nightly reformation of clusters is correlated with two temperature-sensitive behaviours. Laboratory experiments demonstrated that ladybird beetles become photopositive as the temperature in a controlled environment room decreases from 20 C to 7 C, but they revert to a photonegative response as the temperature falls below 5 C. Also, ladybird beetles tend to form clusters as the temperature falls from 35 C to about 15 C. An attractant pheromone assists in cluster formation. Possible selective advantages of cluster formation by ladybird beetles are discussed.

Animal Behaviour
Volume 31, Issue 2, May 1983, Pages 424-430
Result list | previous < 154 of 166 > next 
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