McClureDespland2010

Reference

McClure, M. and Despland, E. (2010) Collective foraging patterns of field colonies of Malacosoma disstria caterpillars. Canadian Entomologist, 142(5):473-480. (Scopus )

Abstract

We monitored 12 colonies of the nomadic social caterpillar Malacosoma disstria Hbner (Lepidoptera: Lasiocampidae) on trembling aspen, Populus tremuloides Michx. (Salicaceae), under field conditions in spring 2007. We examined cohesion and synchronization of colonies and spatiotemporal activity patterns to compare foraging in the field with the results of laboratory studies and with foraging by central-place foragers. All colonies were highly cohesive; fragmentation was observed only three times. Activity was highly synchronous within colonies, with clear alternation between periods of activity and quiescence. Colonies performed 4.25 ± 0.12 (mean ± SE) activity bouts per day, and foraging was more likely to occur in the early morning than at midday. Colony activity was weakly correlated with temperature. In contrast to that of M. americanum (F.), the foraging schedule was flexible: foraging was observed at all recorded times and temperatures. Colonies searched for a new feeding site every 2.54 ± 0.37 days (mean ± SE) after a food source was depleted. Time spent at a food source decreased with colony size, and distance travelled between food sources increased with instar. Malacosoma disstria caterpillars on trembling aspen are not very selective; rather, they minimize movement, thus decreasing potential contacts with predators. © 2010 Entomological Society of Canada.

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@ARTICLE { McClureDespland2010,
    AUTHOR = { McClure, M. and Despland, E. },
    TITLE = { Collective foraging patterns of field colonies of Malacosoma disstria caterpillars },
    JOURNAL = { Canadian Entomologist },
    YEAR = { 2010 },
    VOLUME = { 142 },
    PAGES = { 473-480 },
    NUMBER = { 5 },
    ABSTRACT = { We monitored 12 colonies of the nomadic social caterpillar Malacosoma disstria Hbner (Lepidoptera: Lasiocampidae) on trembling aspen, Populus tremuloides Michx. (Salicaceae), under field conditions in spring 2007. We examined cohesion and synchronization of colonies and spatiotemporal activity patterns to compare foraging in the field with the results of laboratory studies and with foraging by central-place foragers. All colonies were highly cohesive; fragmentation was observed only three times. Activity was highly synchronous within colonies, with clear alternation between periods of activity and quiescence. Colonies performed 4.25 ± 0.12 (mean ± SE) activity bouts per day, and foraging was more likely to occur in the early morning than at midday. Colony activity was weakly correlated with temperature. In contrast to that of M. americanum (F.), the foraging schedule was flexible: foraging was observed at all recorded times and temperatures. Colonies searched for a new feeding site every 2.54 ± 0.37 days (mean ± SE) after a food source was depleted. Time spent at a food source decreased with colony size, and distance travelled between food sources increased with instar. Malacosoma disstria caterpillars on trembling aspen are not very selective; rather, they minimize movement, thus decreasing potential contacts with predators. © 2010 Entomological Society of Canada. },
    COMMENT = { Export Date: 2 November 2010 Source: Scopus CODEN: CAENA doi: 10.4039/n10-001 },
    ISSN = { 0008347X (ISSN) },
    OWNER = { Luc },
    TIMESTAMP = { 2010.11.02 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-77957962874&partnerID=40&md5=d7cea61bddb7c89c0031358954f90802 },
}

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