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    Author(s): Randall S. MorinAndrew M. LiebholdKurt W. Gottschalk
    Date: 2009
    Source: Biological Invasions. 11: 2341-2350.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: View PDF  (700.73 KB)

    Description

    Simple population models predict that the spread of an invading species through a homogenous habitat should be equal in all directions, but geographic variation in the habitat that affects either reproduction or movement could result in variable rates of spread. We analyse records of the historical range expansion of the hemlock woolly adelgid (HWA) (Adelges tsugae Annand) in the eastern United States from 1951 to 2006 to document that this species has spread in an anisotropic fashion. Furthermore, the magnitude and direction of this anisotropy has varied through time. We explore the extent to which this spatial and temporal variation in spread can be explained by geographical variation in climate and by the abundance of hosts, eastern hemlock (Tsuga canadensis L.) and Carolina hemlock (Tsuga caroliniana Engelm.).

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    Citation

    Morin, Randall S.; Liebhold, Andrew M.; Gottschalk, Kurt W. 2009. Anisotropic spread of hemlock woolly adelgid in the eastern United States. Biological Invasions 11: 2341-2350.

    Keywords

    Adelges tsugae, eastern hemlock, Tsuga canadensis, invasive pest, invasion, range expansion, habitat

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