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Báo cáo lâm nghiệp: "Which factors explain lepidopteran larvae variance in seasonal guilds on some oaks"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Which factors explain lepidopteran larvae variance in seasonal guilds on some oaks? | JOURNAL OF FOREST SCIENCE 56 2010 2 68-76 Which factors explain lepidopteran larvae variance in seasonal guilds on some oaks M. Turcáni1 J. Patocka11 M. Kulfan2 1Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Prague Czech Republic Department of Ecology Comenius University Bratislava Slovakia ABSTRACT Differences between the oak lepidopteran communities were studied in Slovakia in 1993 and 1994. Sampling was undertaken between April and October on 3 oak species. Biological traits of larvae were examined in order to explain differences in seasonal guilds among oaks. Cluster analysis shows similarities between communities in the flush feeder guild where the results were influenced mainly by temporal variability in the late spring guild mainly by site factors influencing summer feeder and autumn feeder similarities remain unclear. Detrended Correspondence Analysis DCA was used to investigate the main gradients explaining variability in communities. Results indicated that the host specificity along axis 1 A1 and larval ballooning along axis 2 A2 were important in the flush feeder guild larval feeding strategy along A1 and the degree of defoliation by Lymantria dispar along A2 were important in late spring feeders the year of study along A1 and host specificity along A2 were important in the summer feeder guild and adaptation to lower quality of food along A1 and host specificity along A2 for the autumn feeder guild. The results are discussed. Keywords cluster analysis DCA history-life traits of lepidopteran larvae oaks seasonal guilds The study of forest insect communities is of interest to ecologists worldwide. As mentioned by Lowman and Wittman 1996 forest canopies contain a considerable portion of the species diversity on Earth. Thus an understanding of the variables that determine species richness and composition should have a high importance for both theoretical and practical reasons. However the completion of a reliable inventory .