Degradation of longicorn beetle (Coleoptera,Cerambycidae, Disteniidae) fauna caused by conversion from broad-leaved to man-made conifer stands of <Emphasis Type="Italic">Cryptomeria japonica</Emphasis> (Taxodiaceae) in central Japan |
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Authors: | Shun’ichi Makino Hideaki Goto Motohiro Hasegawa Kimiko Okabe Hiroshi Tanaka Takenari Inoue Isamu Okochi |
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Institution: | (1) Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba Ibaraki, 305-8687, Japan |
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Abstract: | We studied the species richness and assemblages of longicorn beetles (Coleoptera, Cerambycidae, Disteniidae) in ten secondary
broad-leaved stands and eight plantation stands of Japanese cedar (Cryptomeria japonica) of various ages after clear-cutting or plantation in Ibaraki, central Japan. The species richness of longicorns, which were
collected with Malaise traps, was the highest in young stands, decreasing with the age of the stand for both broad-leaved
and conifer stands. A canonical correspondence analysis divided the 18 plots into three groups based on longicorn assemblages
and environmental variables. These three groups consisted of (1) very young (1–4 years old) stands after clear-cutting or
plantation; (2) 12- to over 100 year-old broad-leaved stands; (3) 7- to 76-year-old conifer stands. The species richness of
the longicorns was the highest in the young stands followed, in order of decreasing species richness, by broad-leaved stands
and conifer stands. Possible causes of the high species richness in young stands include large amounts of coarse wood debris
and flowers, which are resources for oviposition and nutrition for adults, respectively. The lower longicorn diversity in
conifer stands than in broad-leaved stands may be due to the lower diversity of trees available as host plants in the former.
Almost all species that occurred in conifer stands were also collected in young and/or broad-leaved stands, but the reverse
was not true, suggesting that conifer plantations cannot replace broad-leaved stands in terms of longicorn biodiversity. We
argue that an extensive conversion of broad-leaved forests into conifer plantations will lead to an impoverishment of the
longicorn fauna, which may result in the degradation of ecosystem functions possibly carried out by them. |
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Keywords: | Biodiversity Chronosequence Forest Insect Plantation |
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