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Temporal and spatial relationships between an herbivorous lady beetle epilachna niponica and its predator the earwig anechura harmandi

Temporal and spatial relationships between an herbivorous lady beetle epilachna niponica and its predator the earwig anechura harmandi

Researches on Population Ecology (Tokyo) 30(1): 57-68

The relationships between egg predation of an herbivorous lady beetle Epilachna niponica (Lewis) and its predator, the earwig Anechura harmandi (Burr), were examined in both time and space. In spite of little annual changes in egg densities, egg mortality due to predation varied considerably. There was no clear relationship between the earwig density and the proportionate predation over the five years. The seasonal occurrence of earwig nymphs on thistle plants, however, was closely synchronized with that of egg predation. Predator attacks on the beetle occurred in a time-restricted manner. Thus, later cohorts mostly escape from heavy predatory pressure. No spatially density-dependent egg predation was detected at the level of either thistle plants or thistle patches. Furthermore, there was no indication of aggregative behaviour of the earwig in response to local egg density. The earwig density was more likely to be associated with particular localities with sandy deposits available for its nest site.

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