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    Author(s): J.R. Webster; K. Morkeski; C.A. Wojculewski; B.R. Niederlehner; E.F. Benfield; K.J. Elliott
    Date: 2012
    Source: The American Midland Naturalist 168: 112-131
    Publication Series: Scientific Journal (JRNL)
    Station: Southern Research Station
    PDF: Download Publication  (1 MB)


    The death of eastern hemlock (Tsuga canadensis) trees in response to infestation by the introduced hemlock woolly adelgid (Adelges tsugae)may affect ecosystem processes and structure of streams. Prior to hemlock mortality,we documented the condition so feight small streams and their associated riparian forests within the Appalachian Mountains of North Carolina, U.S.A. Hemlock was the dominant tree species on all riparian sites and was always sassociated with rhododendron (Rhododendron maximum). Significant trends of increasing canopy openness, increasing light to the streams and increasing annual temperature range were observed. Contributions of hemlock to litterfall, in stream wood, and benthic organic matter were important at the beginning of the study, suggesting that the loss of hemlock may significantly modify the trophic dynamics and physical structure of southern Appalachian streams. Increased growth of rhododendron in response to hemlock mortality may compensate for the trophic influences of hemlock loss. However, because of rhododendron’s negative effect on growth of seedlings of other tree species, the greatest ecosystem impact of hemlock wooly adelgid may be more extensive rhododendron thickets within the riparian corridors of southern Appalachian streams.

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    Webster, J.R.; Morkeski, K.; Wojculewski, C.A.; Niederlehner, B.R.; Benfield, E.F.; Elliott, K.J. 2012. Effects of hemlock mortality on streams in the southern Appalachian mountains. The American Midland Naturalist 168: 112-131.

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