青葉山におけるヒメギフチョウの発生生態と棲息地の植生環境

概要

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Luehdorfia puziloi (Lepidoptera: Papilionidae) is a monophagous univoltine butterfly; its adult flight period in Japan from April to May. Although the butterfly appears on the Japanese Red List (status: Near Threatened), detailed data about its ecology is insufficient to inform conservation decisions. Therefore, we estimate the survival rates in a population of L. puziloi on Mt. Aoba, Miyagi Prefecture using a modification of the Kiritani-Nakasuji-Manly method. The habitat is a deciduous broad-leaved forest dominated by Quercus serrta and its core is approximately 50m long and 30m wide. We surveyed the numbers of eggs and larvae in the habitat 11 times from April 10 to June 23, 2005, and obtained the following estimates of daily survival rate: egg to the first instar larva, 0.98; first to second instar larva, 0.97; second to third instar larva, 0.96; third to fourth instar larva, 0.96; fourth to fifth instar larva, 0.90. We also obtained the following estimates of population size: 517 eggs; 440 first instar larvae; 362 second instar larvae; 243 third instar larvae; 225 fourth instar larvae; 111 fifth instar larvae. The estimated number of adults that emerged on April 15, 2006 were 14.3 based on a Bailey's triple catch method. Therefore if we assume that there were no migrant adults form other populations, the estimated survival rate from egg (517) to adult (14.3) was 2.8%.
2008-07-31