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Population dynamics of the chestnut gall‐wasp, Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae)
Author(s) -
Itô Yosiaki,
Nakamura Masako,
Kondo Masaki,
Miyashita Kazuyoshi,
Nakamura Kazuo
Publication year - 1962
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/bf02533907
Subject(s) - gall wasp , poisson distribution , negative binomial distribution , biology , overdispersion , gall , population , ecology , hymenoptera , statistics , mathematics , botany , demography , sociology
Summary As a part of serial study on population dynamics of the chestnut gall‐wasp, Dryocosmus kuriphilus , analyses of the distribution of eggs, gall‐cells and emergent holes were made from the statistical point of view. Many of distributions of the eggs per bud could be described by the truncated Poisson, but some cases showed slight overdispersion than expected by chance. Because of no linear increase ofs 2 / λ ^with increasing λ ^ (expected mean for complete sample), however, the truncated negative binomial seemed to be not so available for whole series. Distributions of the gall‐cells and the emergent holes were, on the other hand, well described by the truncated Poisson distribution when the observed frequency was calculated for respective trees. Negative‐binomial tendency found in distributions from some stations consisted of a certain number of trees would be resulted from mixture of Poisson populations with different means. Random or slightly concentrated oviposition and random mortality within galls was thus supposed for future study unless the proof favouring other distribution models would appear.