The distribution of pine sawfly cocoons (Diprionidae) in Scots pine stands in relation to stand edge and tree base
The distribution of cocoons of the sawfly community (Diprionidae) within Scots pine (Pinus silvestris L.) stands was quantified for endemic populations in relation to stand edge and distance from tree trunks on the basis of old and living cocoons that had accumulated for several years in the litter....
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Published in | Forest ecology and management Vol. 54; no. 1-4; pp. 193 - 203 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.11.1992
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | The distribution of cocoons of the sawfly community (Diprionidae) within Scots pine (Pinus silvestris L.) stands was quantified for endemic populations in relation to stand edge and distance from tree trunks on the basis of old and living cocoons that had accumulated for several years in the litter. Pine stands were 40 and 80 years old and located in southern Bohemia (Czechoslovakia). The density of living sawfly cocoons overwintering in the litter was low, 0.25–0.48 m−2, (average 0.37) and comprised 2.7% of 2346 cocoons in the samples. Numbers of cocoons decreased with increasing distance from stand edge with 40.5% of the cocoons near the stand edge, in contrast to 25.1% in the stand. Significant differences in cocoon densities also occurred in stands of both ages examined. The cocoon densities decreased nearly linearly with increasing distance from the host tree trunk. About 37% of the cocoons occurred less than 0.3 m from the tree base. The method of circular samples may be more effective at lower population densities. |
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Bibliography: | H H10 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0378-1127 1872-7042 |
DOI: | 10.1016/0378-1127(92)90012-X |