Habitat Differentiation Among Three Species of Sorex and Neurotrichus gibbsi in Washington

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Abstract
Environmental parameters in seral stages of the Tsuga heterophylla vegetation zone were measured and correlated with the presence of 4 insectivores: N. gibbsi, Sorex trowbridgii, S. vagrans and S. monticolus. Correlation coefficients were used to determine the specific habitat occupied by each of the species. Neurotrichus occupied forested areas where it burrowed deeply in the soil. S. trowbridgii also burrowed, yet was commonly found on the surface of the soil foraging among the litter and moss. S. monticolus was more restricted to the layer of debris on the forest floor and perhaps was more successful at foraging there than S. trowbridgii. S. vagrans did not burrow and was found in patchy open areas, alder stands and in areas with high water tables where the numbers of S. trowbridgii were low.

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