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Oecologia

Title:		Low nutritive quality as defence against herbivores: induced responses in birch
Author(s):		Neuvonen S; Haukioja E;
Address:		"Laboratory of Ecological Zoology, Department of Biology, University of Turku, SF-20500, Turku 50, Finland"
Journal Title:		Oecologia
Year:		1984
Volume:		63
Issue:		1
Page Number:		71 - 74
DOI:		10.1007/BF00379787
ISSN/ISBN:		1432-1939 (Electronic) 0029-8549 (Linking)
Abstract:		"The effects of artificial defoliation of birch trees in the previous year on the consumption and utilization of food by a geometrid larva, Epirrita autumnata, were studied in laboratory. The leaves were collected from two sites on a slope of a fell. Defoliation had a significant retarding effect on approximate digestibility, efficiency of conversion of ingested food, relative consumption rate and relative growth rate but not on efficiency of conversion of digested food. The effects were to the same direction with leaves from the two sites, but the response was stronger with leaves from the zone defoliated by Epirrita during mid-sixties. The defensive nature of the response(s) of birch to defoliation is discussed in the light of these results. It is concluded that contrary to the hypothesis of Moran and Hamilton (1980) no increase in the consumption incurred by individual trees could be shown in this system"
Keywords:
Notes:		"PubMed-not-MEDLINENeuvonen, S Haukioja, E eng Germany 1984/07/01 Oecologia. 1984 Jul; 63(1):71-74. doi: 10.1007/BF00379787"