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Effects of group density on call rate, phonokinesis, and mating success in Palmacorixa nana (Heteroptera:Corixidae)
 

Summary: Effects of group density on call rate, phonokinesis, and mating success in
Palmacorixa nana (Heteroptera:Corixidae)
R. B. AIKEN'
Department of Zoology, Erindale College, Universig of Toronto, Mississauga, Ont., Canada L5L 1C6
Received November 13, 1981
AIKEN,R. B. 1982. Effectsof group density on call rate, phonokinesis, and mating success in Palmacorixa nana (Heteroptera:
Corixidae). Can. J. Zool.60:1665- 1672.
Little informationexists on the effects of density on the callingof acousticinsects. In the field, density of Palmacorixa nana
males varies markedly. In the laboratory, such variation appearsto be a result of males forming groupsaround each other. When
males aggregate, the number of spontaneouscalls per male per minute increases exponentially. Females show a phonokinetic
preference for the mean call rate of the densest male aggregation. Males show a phonokinetic preference for the less dense
aggregations. Females always preferred the greatest acoustic power. Phonokinetic responses of male and female P. nana to
groupsof conspecificmales were consistentwith an assessmentof the reproductivecostsand benefitsof associatingwith a group.
As density increased, both the costs and benefits to males of associating with a group increased. In denser aggregations, males
had more copulations per mounting attempt but had more agonistic interactions and mating interferencefrom other males.
AIKEN,R. B. 1982. Effectsof group density on call rate, phonokinesis,and mating success in Palmacorixa nana (Heteroptera:
Corixidae). Can. J. Zool. 60: 1665-1672.
On connait ma1 les effets de la densitk sur les comportementsd'appel chez les insectes acoustiques.En nature, la densitk des
maes de Palmacorixa nana varie considkrablement.En laboratoire,detelles variations semblentprovenir descomportementsde
rassemblement des miles. Lors de ces rassemblements, le nombre d'appels spontankspar mile, par minute, augmentede fa~on

  

Source: Aiken, Ron - Biology Department, Mount Allison University

 

Collections: Biology and Medicine