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Contest and scramble competitions in Callosobruchus maculatus (Coleoptera: Bruchidae) II. Larval competition and interference mechanisms
Author(s) -
Toquenaga Yukihiko
Publication year - 1993
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/bf02515645
Subject(s) - scramble competition , contest , competition (biology) , biology , larva , strain (injury) , vigna , interference (communication) , ecology , zoology , botany , anatomy , political science , law , channel (broadcasting) , electrical engineering , engineering
Summary Competition between contest and scramble strategists was examined using two strains of Callosobruchus maculatus , the contest strain (iQ) and the scramble strain (tQ). The direct larval interference experiment within each strain showed that the contest strain performed strong direct interference throughout its larval stage against the conspecific opponent(s). The scramble strain also performed its interference, but only during the 3rd and the 4th larval stages. The inter‐strain larval competition experiments inside a large and small mung bean ( Vigna radiata ) showed that the contest strain was, in general, superior to the scramble strain in competition, but the competition results were density‐ and frequency‐dependent. In the large beans, the proportion of adult emergence of the contest strain increased with the increase of its own initial density but decreased as the initial density of the scramble strain increased. The shape of the proportion of adult emergence became nonlinear in the small beans. The cause of the complexity of inter‐strain competition results was discussed in the light of the difference in larval interference ability between the two strains.