Population studies of the beech leaf mining weevil (Rhynchaenus fagi) in Ireland and Scotland |
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Authors: | KEITH R. DAY ALLAN D. WATT |
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Affiliation: | Department of Biology, University of Ulster at Coleraine;*Institute of Terrestrial Ecology, Edinburgh Research Station |
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Abstract: | Abstract. 1. Population budgets for Rhynchaenus fagi, based for the most part on samples of beech leaves taken in June, were constructed for a 10-year period (Northern Ireland) and a 3-year period (Scottish borders). 2. There were years of sustained population growth and sustained decline, but not enough evidence to suggest a cycle. Similar population levels were found at both sites in all but one year. 3. Key factors were associated with the adult stage, although egg mortality may also make a significant contribution to population change. 4. Unknown sources of mortality embodied in the residual mortality were also suspected of acting in a density dependent manner, compensating for variation in parasitism. 5. Death rate of larvae within mines was related to May temperature in Northern Ireland, but not so clearly in Scotland. |
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Keywords: | Rhynchaenus fagi population budgets key factors regulation |
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