|| 要旨トップ | 本企画の概要 |
|日本生態学会第69回全国大会 (2022年3月、福岡) 講演要旨
シンポジウム S12-3 （Presentation in Symposium）
Spatial metapopulation dynamics in point pattern approach has been stochastically simulatedand analytically described by the dynamics of singlets, pairs and triplets. A metapopulationis assumed to includes constant number of patches. Each patch is represented as a point inthe two-dimensional unit space Ω = [0,1)×[0,1) assumed to be torus with periodic boundaryand is assigned a status either 0 (empty) or 1 (occupied). We assume that the point patternincludesNpoints with static positions and three types of point pattern in used are completespatial randomness, clumped and over-dispersed. In our model, “colonization rate” with whichan empty patch becomes occupied plays a key role. Colonization rate is assumed to consist oflocal and global colonization, in which local colonization occurs with the rate that decreaseswith distance and global colonization rate occurs at the rate proportional to the total number ofoccupied patches independent of distance. The dynamics of the metapopulation model can bemathematically described by the dynamics of singlet, pair and triplet probabilities. The resultsof simulations and analytical derivation of equilibrium singlet and pair probabilities have beenderived and compared.