Abstract
Records of 232 moth species spanning 26 years (total catch of ca. 230,000 specimens), obtained by continuous light-trapping in Kevo, northernmost subarctic Finland, were used to examine the hypothesis that life-history traits and taxonomic position contribute to both relative abundance and temporal variability of Lepidoptera. Species with detritophagous or moss-feeding larvae, species hibernating in the larval stage, and species pupating during the first half of the growing season were over-represented among 42 species classified as abundant during the entire sampling period. The coefficients of variation in annual catches of species hibernating as eggs averaged 1.7 times higher than those of species hibernating as larvae or pupae. Time-series analysis demonstrated that periodicity in fluctuations of annual catches is generally independent of life-history traits and taxonomic affinities of the species. Moreover, closely related species with similar life-history traits often show different population dynamics, undermining the phylogenetic constraints hypothesis. Species with the shortest (1 year) time lag in the action of negative feedback processes on population growth exhibit the largest magnitude of fluctuations. Our analyses revealed that only a few consistent patterns in the population dynamics of herbivorous moths can be deduced from life-history characteristics of the species. Moreover, the diversity of population behaviour in one moth assemblage challenges any conventional wisdom suggesting predictable patterns. Our results raise several questions about perceptions and paradigms in insect population dynamics and stress the need for research on detritivorous insect population dynamics, as well as the need for more assemblage-wide studies using common trapping methods to provide comparative data on related and unrelated species with different life-history traits.
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Notes
Although light-trapping has continued until recently, delays in specimen identification have restricted the current analysis to data from the first 26 years.
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Acknowledgments
Many individuals contributed to the creation of the data set used in this publication (+ denotes deceased). We warmly thank the station heads (+P. Kallio, E. Haukioja and S. Neuvonen) and staff of the Kevo Subarctic Research Institute for study facilities and generous help in the work. L. Iso-Iivari was primarily responsible for trap maintenance and sampling of the material. Many persons participated in sorting the material; E. Zvereva who sorted samples from 1985 to 1994, is specially acknowledged. Responsibility for determination of moths sampled during 1971–1982 was taken by +E. T. Linnaluoto; later samples were mostly determined by M. Kozlov. Our thanks to +J. Jalava, L. Kaila, +J. Kyrki, K. Mikkola, K. Ruohomäki, L. Sippola, T. Tammaru and many other specialists who helped us with identification and shared with us biological data not generally available through publications. E. Zvereva, +E. Ranta, T. Tammaru, M. Ayres and two anonymous reviewers provided valuable comments on an earlier draft of the manuscript. Financial support was provided by the Academy of Finland (projects no. 1071299, 2228, 122133 and Centre of Excellence for Forest Ecology and Management project 64308), and the EU BALANCE project carried out under contract EVK2-2002-00169.
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Kozlov, M.V., Hunter, M.D., Koponen, S. et al. Diverse population trajectories among coexisting species of subarctic forest moths. Popul Ecol 52, 295–305 (2010). https://doi.org/10.1007/s10144-009-0183-z
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DOI: https://doi.org/10.1007/s10144-009-0183-z