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- W2316965151 abstract "SUMMARY (1) This paper describes the within-pasture and between-pasture movements of two closely related and abundant beetles, Sphaeridium lunatum and S. scarabaeoides (Coleoptera: Hydrophilidae), feeding and breeding exclusively in cow pats. (2) Sphaeridium lunatum occurs, on average, in older pats than S. scarabaeoides and in both species, mature females occur in older pats than males or immature females. The difference in the colonization pattern between the sexes results from differences in the rates of immigration to and emigration from pats. Females arrive at fresh pats earlier than males, but mature females, unlike immature ones, are likely to leave the pat rapidly; if they stay, they will stay a long time. Density-dependence in the rate of emigration was shown experimentally and was observed in the field. (3) The proportion of individuals with an empty gut was lowest amongst resident immature females, which were probably mostly feeding, higher amongst resident males and mature females, and highest amongst arriving individuals. These results suggest that feeding and breeding are partly conflicting activities in the time budget of these beetles. (4) In S. scarabaeoides, immature females predominate amongst long-distance migrants (the oogenesis-flight syndrome), but in S. lunatum, males and mature females also frequently move long distances. On the whole, S. lunatum showed more long-distance movements than S. scarabaeoides. Other differences exist between mature and immature females. (5) These results are discussed in relation to hypotheses about the function of movements in different individuals. A new hypothesis is put forward to explain the behavioural differences between the species. We suggest that such differences in movements decrease the spatial coincidence between species, which decreases the intensity of interspecific competition, and may allow ecologically similar species to coexist in the same community." @default.
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- W2316965151 date "1983-10-01" @default.
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- W2316965151 title "Movement Patterns in Sphaeridium: Differences between Species, Sexes, and Feeding and Breeding Individuals" @default.
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- W2316965151 doi "https://doi.org/10.2307/4446" @default.
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