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Contest and scramble competitions in two bruchid species, Callosobruchus analis and C. Phaseoli (Coleoptera: Bruchidae)
Author(s) -
Toquenaga Yukihiko,
Fujii Koichi
Publication year - 1991
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/bf02513548
Subject(s) - vigna , biology , competition (biology) , callosobruchus chinensis , callosobruchus maculatus , scramble competition , radiata , mung bean , larva , botany , horticulture , ecology , pest analysis
Summary We performed multiple‐generation competition experiments between Callosobruchus analis and C. phaseoli with different bean sizes. In each system, we supplied 5 g of mung beans ( Vigna radiata ) every 10 days. We examined three types of bean conditions: 5 g of large beans, 5 g of small beans, and a mixture of 2.5 g of large and small beans. In small bean condition, C. analis dominated C. phaseoli in all three replicates and C. phaseoli was extinct by the 260th day. On the contrary, C. phaseoli overcame C. analis within 250 days in large beans in all three replicates. In mixed beans condition the two bruchid species coexisted more than 500 days in two out of the three replicates. Even in the exceptional case, both species coexisted for 460 days. These results were examined in the light of the predictions from short‐term larval competition experiments and a game theoretical model by Smith and Lessells (1985). The density and frequency dependent results during larval competition inside a bean was concluded to be a main factor to produce the above long‐term competition results.