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THE INFLUENCE OF CARPENTER ANT (CAMPONOTUS MODOC) (HYMENOPTERA: FORMICIDAE) ATTENDANCE ON THE DEVELOPMENT AND SURVIVAL OF APHIDS (CINARA SPP.) (HOMOPTERA: APHIDIDAE) IN A GIANT SEQUOIA FOREST1

Published online by Cambridge University Press:  31 May 2012

David A. Tilles  and
David L. Wood
David A. Tilles
Affiliation:
Department of Entomological Sciences, University of California, Berkeley 94720
David L. Wood
Affiliation:
Department of Entomological Sciences, University of California, Berkeley 94720
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Abstract

Camponotus modoc was associated with numerous species of Homoptera in Giant Forest, Sequoia — Kings Canyon National Park, California. Ant-exclusion experiments and field observations indicated that survival of the abundant Cinara occidentalis Davidson on white fir depends on attendance by C. modoc. More of the predators, Neomysia oblonguttata (Mulsant), Deraeocoris brevis Uhler, Passaloecus cuspidatus F. Smith, Pityophyphantes sp., were found on ant-unattended than on attended aphid colonies. As aphid populations decreased, ant attendance per aphid and number of predators/aphid increased. Attended aphid colonies were more likely to survive to produce oviparae and a lower proportion of alates.

Résumé

La fourmi Camponotus modoc s'associe à diverses espèces d'Homoptères dans la Giant Forest, au Parc National du Sequoia—Kings Canyon, en Californie. Des expériences d'exclusion et des observations directes ont établi que la survie du Cinara occidentalis Davidson, lequel est abondant sur le sapin du Colorado, dépend de son association à la C. modoc. Des nombres plus élevés des prédateurs Neomysia oblonguttata (Mulsant), Deraeocoris brevis Uhler, Passaloecus cuspidatus F. Smith, Pityophyphantes sp., ont été relevés sur des colonies de pucerons non-fréquentées par la fourmi, que sur des colonies fréquentées. Avec une diminution des populations d'aphides, le taux de fréquentation par aphide ainsi que le nombre de prédateurs par aphide ont augmenté. Les colonies fréquentées ont montré de meilleures chances de survie jusqu'à la production d'ovipares, de même qu'une proportion d'ailées plus faible.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 12 , December 1982 , pp. 1133 - 1142
Copyright
Copyright © Entomological Society of Canada 1982

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