Glass Effect in Inbreeding-Avoidance Systems : Minimum Viable Population for Outbreeders
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概要
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Many animals, birds and plants have evolved nnechanisrns to axzoid inbreeding between closerelatives. Strch mating systems naay h?xve developed several methods for restricting mate choice.If ['ragrnentation of habit?tts beconaes serious, these rrnethods rnay lead to a lack of accepta1.cleua?ates, We call this "glass ef['ect" which is a generalization of the so-called Allee effect. XVepresent two inbreeding-avoidance (outbreeding) models. Both rnodels show that outlcreedershave a high risk in fragmented environrnezats. XVe thtrs obtain the raainitnuuaa viable population(MVP). It is fotrnd that the value of IVIVP amotrnts to the r'ange f'rom several hundred to severalthotrsand individtrals. While this value is much larger than those obtained by the previotrsdemographic theories, it is corasistent with recetat ernpirical estimations. lVIoreover, we find thatthe glass efl'ect is catused by dynaunically induced clusters of relatives. This suggests that geneticvariation will be decreased Icy the otrtbreeding in a highly fr'?tgrarented environnuertt.
- 社団法人日本物理学会の論文
- 1996-10-15
著者
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Tainaka Kei-ichi
Department Of Mathematical Science Ibaraki University
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Itoh Yoshiaki
Institute Of Statistical Mathematics
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