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ARTHROPOD COMMUNITIES IN THE CROWNS OF THE NATURAL AND PLANTED STANDS OF PINUS RADIATA (MONTEREY PINE) IN CALIFORNIA

Published online by Cambridge University Press:  31 May 2012

C. P. Ohmart  and
W. G. Voigt
C. P. Ohmart
Affiliation:
Division of Forest Research, CSIRO, Canberra, ACT 2600, Australia
W. G. Voigt
Affiliation:
Division of Biological Control, University of California, Albany, California 94706, U.S.A.
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Abstract

One hundred and ten species of insects together with unidentified spiders and pseudoscorpions were collected in foliage samples of Pinus radiata taken from the three natural mainland populations and two planted populations in California. The diversity of the arthropod community in the crowns of P. radiata D.Don was low with 76% of the total number of individuals accounted for by five species groups and 88% by 11 species groups. Spiders were the most abundant species group, comprising 33% of the total number of individuals. The most abundant insect groups were Homoptera, Hemiptera and Coleoptera, respectively. The natural stands supported more species at higher population levels than the planted stands which supported only two species at very high population levels and the rest at low levels. The arthropod communities at the borders of the natural stands were more diverse than at the centers of the stands. The degree of similarity between the natural stands seemed to reflect their geographic distribution; Ano Nuevo and Monterey were most alike and the differences between Ano Nuevo and Cambria were greater than those between Monterey and Cambria. Differences in insect communities within and between the natural and planted stands are discussed in detail.

Résumé

Cent-dix espèces d’insectes y compris des araignées et pseudoscorpions non-identifiés ont été échantillonnées sur du feuillage de Pinus radiata prélevé dans trois populations continentales naturelles et deux populations plantées en Californie. La diversité de la communauté arthropodienne des couronnes de P. radiata D.Don s’est révélée faible avec 5 groupes spécifiques représentant 76% du nombre total d’individus et 11 groupes spécifiques, 86% du total. Les araignées étaient le groupe spécifique le plus abondant, comprenant plus de 33% du nombre total d’individus. Les groupes d’insectes les plus importants étaient par ordre les homoptères, les hémiptères et les coléoptères. Les peuplements naturels présentaient plus d’espèces dont les niveaux de population étaient plus élevés que les plantations qui n’abritaient que deux espèces à niveaux élevés de populations, et le reste à bas niveaux. Les communautés d’arthropodes aux limites des peuplements naturels étaient plus diversifiées qu’au centre des peuplements. Le degré de similarité entre les peuplements naturels a semblé être le reflet de leur distribution géographique; Ano Nuevo et Monterey étaient les plus semblables et les différences entre Ano Nuevo et Cambria étaient plus grandes qu’entre Monterey et Cambria. Les différences inter- et intra-peuplements naturels et non-naturels concernant la composition de la communauté d’insectes, sont commentées en détail.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 8 , August 1981 , pp. 673 - 684
Copyright
Copyright © Entomological Society of Canada 1981

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