Translator Disclaimer
1 October 2003 Effect of Temperature and Intraspecific Allometry on Predation by Two Phenotypes of Harmonia axyridis Pallas (Coleoptera: Coccinellidae)
Author Affiliations +
Abstract

Harmonia axyridis Pallas is a highly polymorphic coccinellid with a wide geographic distribution. Genetic polymorphism seems to be the strategy adopted for facing different habitats at different times. Many modifications, such as body shape, body size, and elytral patterns, may be adaptive through imparting increased tolerance to adverse conditions. Previous studies evaluating differences in the light-colored aulica and dark colored nigra phenotypes found differences in biological performances at 20°C. However, whether the predatory activity of the different phenotypes changes under different temperatures remains unknown. Relative consumption rate and predation activity of fourth instars and adults of aulica and nigra phenotypes were compared at 10, 15, 20, 25, and 30°C. Our results showed that temperature is a limiting factor to larval and adult relative consumption rate. The thermal optimum of nigra adults was 3.7°C lower than that of aulica. Both larvae and adults of nigra were more stenothermic than aulica. Close to the upper limit of tolerance (30°C), predation activity of nigra adults was more affected than aulica. In larvae body size and shape could explain the differences observed, because aulica is significantly bigger than nigra and thus aulica presumably can better control heat exchange.

António Onofre Soares, Daniel Coderre, and Henrique Schanderl "Effect of Temperature and Intraspecific Allometry on Predation by Two Phenotypes of Harmonia axyridis Pallas (Coleoptera: Coccinellidae)," Environmental Entomology 32(5), (1 October 2003). https://doi.org/10.1603/0046-225X-32.5.939
Received: 14 May 2002; Accepted: 1 April 2003; Published: 1 October 2003
JOURNAL ARTICLE
6 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top