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INTRAPOPULATION SIZE VARIATION OF FREE-LIVING AND TREE-BORING COLEOPTERA

Published online by Cambridge University Press:  31 May 2012

Johan Andersen  and
Arne C. Nilssen
Johan Andersen
Affiliation:
Institute of Biology and Geology, Box 3085 Guleng, University of Tromsø, 9001 Tromsø, Norway
Arne C. Nilssen
Affiliation:
Zoology Department, Tromsø Museum, University of Tromsø, 9000 Tromsø, Norway
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Abstract

Intrapopulation size variation was studied by means of length measurements quoted in taxonomic literature and from material of various groups of Coleoptera collected in the field. The degree of variation was significantly different among groups, and generally the free-living groups had lower intrapopulation size variation than most of the tree-boring and the parasitoid groups. Several tree-boring groups (e.g. Scolytidae, Curculionidae), however, had a comparatively low variation. A high intrapopulation size variation is common in species whose larvae are unable to choose and determine their own nutritional situation. Such larvae have a restricted mobility and the quality of their food is unpredictable. This is characteristic for most of the tree-boring groups. A high size variation increases the niche width of the species and probably has a buffering effect in unpredictable environments. Those tree-borers that are able to reduce the degree of unpredictability (i. e. by parental care, specialization in choice of microhabitat and in larval morphology, as in Scolytidae) have a rather low intrapopulation size variation. There are two possibilities regarding the genetic nature of the high size variation: (1) The population contains a variety of phenotypes with genetically fixed size, and (2) each individual is flexible with the possibility of becoming large or small depending upon the nutritional conditions. Possibility (1) is in agreement with the theories of a correlation between environmental heterogeneity and a high intrapopulation genetic variation. Free-living species and those tree-borers with less intrapopulation size variation are usually subject to more uniform conditions, and if adverse conditions do arise, these species usually fail to complete their development rather than produce smaller adults.

Résumé

La variation intrapopulation de la taille a été étudiée chez plusieurs groupes de Coléoptères à partir de mesures de la longueur citées dans la littérature taxonomique, ou de matériel collectionné sur le terrain. L'ampleur de la variation s'est avérée significativement différente entre les groupes, et en général les groupes d'espèces vivant librement ont montré une variation intrapopulation de la taille qui était plus faible que la plupart des groupes de perceurs d'arbres ou de parasitoïdes. Cependant, plusieurs groupes de perceurs (ex. Scolytidae, Curculionidae), ont montré comparativement peu de variation. Une variation intrapopulation élevée de la taille est commune chez les espèces dont les larves n'ont pas la possibilité de choisir et de déterminer leur environnement trophique. Ces larves ont une mobilité réduite et la qualité de leur nourriture est imprévisible. Ceci est caractéristique de la plupart des groupes de perceurs d'arbres. Une variabilité élevée de la taille augmente l'étendue de la niche de l'espèce et a probablement un effet tampon dans les habitats imprévisibles. Chez les perceurs pouvant réduire le niveau d'imprévisibilité (par ex. soins parentaux, spécialisation de la sélection du microhabitat ou de la morphologie larvaire tel que chez les Scolytidae), la variation intrapopulation de la taille est faible. Deux possibilités existent concernant la nature génétique d'une grande variation de la taille : (1) la population comporte une diversité de phénotypes et le génotype pour la taille est fixé et (2) chaque individu est flexible, ayant la possibilité d'être gros ou petit, dépendant des conditions nutritionnelles. (1) est en accord avec les théories établissant une corrélation entre l'hétérogénéité environnementale et une grande variation génétique intrapopulation. Les espèces vivant librement et les perceurs d'arbres qui ont le moins de variation de taille intrapopulation, sont généralement exposés à des conditions plus uniformes; et si des conditions adverses se développent, ces espèces ne compléteront généralement pas leur développement plutôt que de former de petits adultes.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 11 , November 1983 , pp. 1453 - 1464
Copyright
Copyright © Entomological Society of Canada 1983

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