Shrews have been documented to travel across frozen lakes and establish populations on previously uninhabited islands; thus,the shrews have a limited gene pool.If this limited gene pool has allele frequencies that are very different from the allele frequencies found in the original population,then this would be an example of:

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The establishment of populations on previously uninhabited islands and the subsequent limited gene pool suggest the occurrence of a founder effect where a small group of individuals become isolated and establish a new population with a limited genetic diversity. If the allele frequencies in this new population are different from those in the original population, this would be an example of founder effect.

Shrews Have Been Documented to Travel Across Frozen Lakes and Establish