Summary
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1.
A field study was carried out on the population dynamics of a thistle-feeding lady beetle,Henosepilachna pustulosa (Kôno) living in a cool temperature climax forest in northern Kyoto Prefecture, central Japan.
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Intensive marking, release and recapture program was carried out to estimate the adult population parameters by usingJolly-Seber method.
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Sampling ratio was around 50%. Marking ratio rapidly rised as the census progressed and approached to 100%.
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Sex ratio (% ♀) was 63–69% in both overwintered and new adults.
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Daily survival rate was as high as 0.95 or more and constant throughout the season. Adult longevity in the spring was longer than 40 days.
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Reproductive rate i. e., the ratio of the number of newly emerged adults in a given generation to that of overwintered adults in the preceding generation, is very small, ranging 1–3, whereas winter survival is higher than 50%, consequently the size of populations in the study area remain in a remarkably constant size and it never reached a level where intraspesific competition occurred.
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The population characteristics ofH. pustulosa are compared with those of the two closely related species,H. vigintioctopunctata andH. vigintioctomaculata, which are the pests ofSolanaceous crops.Hp is moreK-strategic than the two pest species.
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Nakamura, K., Ohgushi, T. Studies on the population dynamics of a thistle-feeding lady beetle,Henosepilachna pustulosa (Kôno) in a cool temperature climax forest. Res Popul Ecol 20, 297–314 (1979). https://doi.org/10.1007/BF02512634
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DOI: https://doi.org/10.1007/BF02512634