caa a22 4500 475838394 CHVBK 20180406123854.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1007/PL00012005 doi (NATIONALLICENCE)springer-10.1007/PL00012005 Kamata N. Department of Biology, Faculty of Science, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan Tel. +81-76-264-5708; Fax +81-76-264-5708 e-mail: kamatan@kenroku.kanazawa-u.ac.jp, JP aut Population dynamics of the beech caterpillar, Syntypistis punctatella , and biotic and abiotic factors [Elektronische Daten] [N. Kamata] The beech caterpillar, Syntypistis punctatella (Motschulsky) (Lepidoptera: Notodontidae), often causes extensive defoliation of beech forests in Japan. Outbreaks have often occurred synchronously among different areas at intervals of 8-11 years. Synchrony of outbreaks was considered to be caused by synchrony of weather. Populations of this insect exhibit periodical dynamics in both outbreak and nonoutbreak areas. Factors that might influence the population dynamics of the beech caterpillar were classified from the point of view of the natural bioregulation com-plex, which includes a coleopteran predator, Calosoma maximowiczi, avian predators, parasitoids, entomopathogenic fungi, and delayed induced defensive response (DIR) of beech trees. Because such periodic population dynamics are believed to be caused by one or more delayed density-dependent factors, delayed density-dependent mortality has been identified as a likely source of population cycles. The DIR and pathogenic diseases showed a high order of density dependence. An infectious pathogen, Cordyceps militaris, was considered to be the most plausible agent responsible for periodic dynamics of the beech caterpillar population because insect diseases were effective in cases in which the S. punctatella population started to decrease without reaching outbreak densities, but DIR was not. Conspicuous defoliation caused by this insect tends to occur at certain elevations, where forests are composed of pure stands of beech trees. I propose three different hypotheses to explain this phenomenon: the diversity-stability hypothesis, the resource concentration hypothesis, and the altitudinal soil nutrient hypothesis. The Society of Population Ecology and Springer-Verlag Tokyo, 2000 Key words Quasi-periodic outbreaks nationallicence Time delay nationallicence Density dependence nationallicence Insect disease nationallicence Delayed induced response nationallicence Site dependence nationallicence https://doi.org/10.1007/PL00012005 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/PL00012005 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Kamata N. Department of Biology, Faculty of Science, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan Tel. +81-76-264-5708; Fax +81-76-264-5708 e-mail: kamatan@kenroku.kanazawa-u.ac.jp, JP aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer