Population Ecology and Genetic Structure of Harvest Mice (Micromys minutus) in Guandu Salt Marsh
Date Issued
2008
Date
2008
Author(s)
Jiang, Show-Yueh
Abstract
The Guandu salt marsh in the Guandu Nature Park (Taipei, Taiwan) offered habitat patches of different qualities for the harvest mouse (Micromys minutus). The current research aimed to find out (1) if succession could influence the genetic structure of the harvest mouse and (2) how population dynamics affected the genetic structure of the harvest mouse. Study site were categorized into dense, sparse, and mix patches. Dense patches were preferred by Micromys minutus. However, the overall area of dense patches decreased greatly during the succession occurred between 2000 and 2005. The decrease of dense patches not only reduced but also fragmented the habitats suitable for the harvest mouse. The harvest mouse population was fragmented along with dense patches, yet the population did not become structured genetically with significance. I detected bottleneck effect with M-ratio(M<0.68) but not mode-shift and heterozygosity excess in both year, which indicated that bottleneck probably occurred in the past distant enough that the signature of bottleneck detectable by mode-shift and heterozygosity excess has been erased. Within each year, population size became very low in summer, and the genetic differentiation was significant between spring and autumn population in 2005. Overall, the results suggest that salt marsh succession can influence the genetic structure of the harvest mouse in Guandu salt marsh spatially and temporal in a short period of time.
Subjects
bottleneck
habitat heterogeneity
microsatellite
population dynamics
population genetics
succession
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