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From the inverse density–area relationship to the minimum patch size of a host–parasitoid system
Author(s) -
Zhao ZiHua,
He DaHan,
Hui Cang
Publication year - 2012
Publication title -
ecological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.628
H-Index - 68
eISSN - 1440-1703
pISSN - 0912-3814
DOI - 10.1007/s11284-011-0903-7
Subject(s) - parasitoid , aphid , population density , population , minimum viable population , density dependence , ecology , host (biology) , inverse , mathematics , trophic level , biology , habitat , agronomy , geometry , endangered species , demography , sociology
The minimum amount of suitable habitat (MASH) is an important concept in conservation biological control. Two methods for estimating the MASH have been proposed by McCoy and Mushinsky based on an inverse density–area relationship. Using data of the population densities of aphid host–parasitoid–hyperparasitoid collected from wheat fields of different habitat sizes, we argued that the inverse density–area relationship may be an artifact. Significant correlations between population densities and patch sizes from all three trophic levels were found once the population density had been log‐transformed. We could not obtain the same results if the population density had not been log‐transformed. We estimated that the MASH for the aphid M. avena , S. graminum , A. avenae , A. gifuensis , P. aphidis , and Alloxysta sp. were 246, 246, 479, 495, 949, and 835 m 2 according to the methods of McCoy and Mushinsky. The scale‐dependence and the systematic spatial variations of the host–parasitoid interaction suggests that we can achieve an optimal effect of biological control by manipulating the habitat patch sizes, although not based on the inverse density–area relationship.