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- W2324353354 abstract "SUMMARY (1) Fifteen species of bark beetle and one ambrosia beetle (Scolytidae) were found breeding in the fallen leafstalks of eight species of tree in West Malaysia. (2) Comparisons of the communities present in different trees and at different sites indicate that long distance dispersal is relatively infrequent, and that the beetle guild as a whole does not show strong host preferences within the range of tree species with suitable leaves. (3) Species which are known to breed in other habitats (twigs, fruits, etc.) tend to have high niche breadths and high overlap values in the leafstalk habitat. Four of the five species only known to breed in leafstalks have low niche breadths and low overlap values, particularly with each other. Niche separation of the specialist species is largely through preferences for different host genera. Further niche separation occurs because most species preferentially attack different parts of the leafstalk. (4) Colonization of the leafstalks is particularly affected by their moisture content. Within the leafstalks, mortality of the immature stages is low, but brood sizes are small, apparently due to the poor quality of the leafstalks as food. (5) Species which breed in leafstalks in the non-seasonal tropics occupy a habitat which is continuously renewed over the life of the tree and essentially spatially constant during that time. For the specialist species, these advantages presumably outweigh the disadvantages of poor food quality and small brood sizes. (6) Most bark and ambrosia beetles breed in habitats which are unstable, and spatially and temporally heterogeneous. This creates problems of dispersal and host-finding for the adult beetles, particularly in the tropical rain forest. Various strategies have been evolved to overcome these problems. From the point of view of the adult beetle, the heterogeneity is reduced by polyphagy, and by breeding in leafstalks. Spanandry facilitates the colonization of low stability habitats. Species which attack but do not kill living trees avoid these problems but are faced by others. Similar strategies have been evolved by other insects living in habitats with similar characteristics." @default.
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- W2324353354 date "1979-10-01" @default.
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- W2324353354 title "Non-Equilibrium `Island' Communities. A Guild of Tropical Bark Beetles" @default.
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- W2324353354 doi "https://doi.org/10.2307/4209" @default.
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