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Non‐parametric modelling of non‐linear density dependence: a three‐species host–parasitoid system
Author(s) -
Kristoffersen A. B.,
Lingjærde O. C.,
Stenseth N. CHR.,
Shimada M.
Publication year - 2001
Publication title -
journal of animal ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.134
H-Index - 157
eISSN - 1365-2656
pISSN - 0021-8790
DOI - 10.1046/j.0021-8790.2001.00540.x
Subject(s) - parasitism , parasitoid , callosobruchus chinensis , pteromalidae , biology , host (biology) , population , ecology , population density , log linear model , statistics , mathematics , linear model , demography , sociology
Summary1 Time‐series data from a twice‐replicated population experiment (consisting of a seed beetle (host), Callosobruchus chinensis , and two parasitoids, Anisopteromalus calandrae and Heterospilus prosopidis ) were studied in order to identify and to estimate the density‐dependent structure. 2 A non‐parametric host–parasitoid model based on the Nicholson–Bailey model, was studied through non‐parametric autoregressive modelling. An additive non‐linear structure was found in the population growth/parasitism rates for all three species. 3 The analysis suggests that the abundance of A. calandrae only weakly affects its own parasitism rate as well as H. prosopidis parasitism rate. 4 The analysis also suggests that the net population growth rate of C. chinensis is highly non‐linear, which may be due to disproportionately higher egg mortality at high adult densities. 5 Non‐linearity was also demonstrated in the parasitism rate of H. prosopidis , which is consistent with assuming that the density‐dependent mutual interference becomes disproportionately higher at high H. prosopidis adult densities.