The recent declines
of many salmonid species throughout the Pacific Northwest are
motivating resource managers to consider new standards for riparian
management in the Oregon Coast Range that involve converting
hardwood-dominated riparian zones to conifer. Conversion from
red alder- to conifer-dominated flood plains of small streams
in the Coast Range may benefit salmonids and other fishes, but
may have unintended consequences for other species, such as
amphibians. How habitat alteration may affect
the distribution, survival, and persistence of amphibians is
currently not well understood.
The goal of this project is to examine the relationships
among riparian vegetation, aquatic and terrestrial riparian
amphibian assemblages, and their invertebrate prey. We will
compare the diversity of amphibians found in streams and riparian
zones in the Oregon Coast Range and identify habitat components
that may be correlated with their occurrence and distribution
in these areas. We will also examine trophic linkages by assessing
and comparing amphibian diet and invertebrate prey availability
in these habitats.
The
information gained from this research can be used to evaluate
the influence of different riparian vegetation on prey sources
and amphibian communities. Understanding the significance
and contribution of compositionally different vegetation within
the riparian zone to the stream system and amphibians is important
for providing baseline information that can be used to assess
potential impacts of altering vegetation in these areas.
For additional information about this research study see
the 2005 CFER
Annual Report. (2.2 MB)
