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EFFECTS OF DENSITY, DISTURBANCE, AND WASTE PRODUCTS ON GROWTH OF LARVAL ENALLAGMA EBRIUM (HAGEN) (ODONATA: COENAGRIONIDAE)

Published online by Cambridge University Press:  31 May 2012

Robert L. Baker
Robert L. Baker
Affiliation:
Department of Zoology, University of Toronto, Erindale Campus, Mississauga, Ontario, Canada L5L 1C6
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Abstract

Individual growth rates of larval dragonflies can exhibit density dependence under field conditions. Retarded growth can occur despite an apparent abundance of food and may be due to some form of stress caused by aggressive interactions. I used laboratory experiments to test for effects of larval density, accumulated waste products, and disturbance on growth of larval Enallagma ebrium given abundant food. Experimental treatments had no clear effect on larval weight, size, or duration in an instar. Thus aggressive interactions, in the absence of food limitation, may not be important in affecting growth rates of larval odonates.

Résumé

On sait que le taux de croissance individuel des larves de libellules peut être dépendant de la densité dans des conditions naturelles. Un retard de la croissance peut se produire en dépit de l’abondance apparente de la nourriture, ce qui pourrait être attribué à une certaine forme de stress lié aux interactions aggressives. Dans le cadre d’expériences de laboratoire, j’ai testé les effets de la densité larvaire, de l’accumulation de déchets, et du dérangement sur la croissance larvaire de Enallagma ebrium en présence d’une nourriture abondante. Les variables expérimentales n’ont pas eu d’effet évident sur le poids larvaire, la taille, ou la durée d’un stade. Ainsi il apparaît que les intéractions aggressives, en l’absence de privations alimentaires, n’ont pas d’effet important sur les taux de croissance des larves d’odonates.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 4 , April 1986 , pp. 325 - 328
Copyright
Copyright © Entomological Society of Canada 1986

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