tailieunhanh - Báo cáo lâm nghiệp: "On the occurrence of web-spinning sawflies of the genus Cephalcia (Hymenoptera, Pamphiliidae) in the Czech Republic"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: On the occurrence of web-spinning sawflies of the genus Cephalcia (Hymenoptera, Pamphiliidae) in the Czech Republic. | JOURNAL OF FOREST SCIENCE 53 2007 Special Issue 57-62 On the occurrence of web-spinning sawflies of the genus Cephalcia Hymenoptera Pamphiliidae in the Czech Republic J. Holusa1 2 J. Liska1 R. Modlinger1 a. VÉLE3 1Forestry and Game Management Research Institute Jtloviste-Strnady Czech Republic Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Prague Czech Republic 3Faculty of Science Palacký University Olomouc Czech Republic ABSTRACT In total 55 862 specimens of seven species of the genus Cephalcia C. abietis C. arvensis C. alashanica C. alpina C. annulicornis C. erythrogaster C. masuttii were collected using Malaise traps in spruce mountain forests from 2001 to 2006. Sex ratio was male biased as a result of used methods males are more active and quicker. The flight activity started in the studied localities at the beginning of May or the beginning of June depending on the actual weather. C. alpina flew first followed by C. erythrogaster and C. arvensis the last flying species were C. alashanica and C. abietis. C. abietis was the most abundant in all localities within all years total dominance of 93 . C. arvensis C. alashanica and C. alpina were collected in more than hundred of specimens while C. annulicornis C. erythro-gaster and C. masuttii were collected only occasionally. Environmental variables were tested with the RDA model which proved several of them years of 2001-2003 2006 Ceský les and Slavkovský les as significant. This is probably a result of following facts i web-spinning sawflies occur throughout the whole range of spruce in Central Europe therefore only two mountain regions were significant but no species is positively correlated with them ii C. abie-tis expanded in the Krkonose Mts. in 2003 and 2006 iii C. alashanica C. alpina C. annulicornis C. erythrogaster were more abundant in 2002 iv abundances of all species were very low in 2000. The factor of management was not significant although samples from cultural forests

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