Index of Biotic Integrity for Fish Communities in the DE River Basin

Two years of field work have been completed in the development of an
index of biotic integrity (IBI) for fish communities in the
middle-to-upper Delaware River basin (Delaware Water Gap to Callicoon,
New York). Fish were collected in riffles and pools on 200 m segments
of eight tributaries. Collections were made concurrently in the
Delaware River mainstem within 0.5 mile (downstream) of the same
tributary mouths, in three habitat types: riffles, deep pools, and
inshore submerged vegetation zones. Quality control on species
identity, as well as length/weight/disease determination, has been
completed on all specimens. A total of 15,673 fish were collected
(7,655 in tributaries and 8,018 in mainstem habitats) representing 44
species (36 in tributaries and 36 in mainstem habitats).

Fish community data (species richness, trophic composition, and
population/health data) will be related to both water quality and land
use data to develop IBIs. Water quality data, including a dozen or
more physical, chemical, and biological parameters taken during the
same seasons/years by Delaware River Basin Commission personnel, are
currently being indexed for use in the models. Land use data in four
categories (22 subcategories), obtained from the Anderson Level 2
database using GIS techniques, have been summarized for use in the
models. Current work involves examination of the variance associated
with traditional fish metrics and the identification of alternative
metrics that may better explain the covariance with water quality and
land use.

The Research and Development Laboratory-Wellsboro (RDL-W) is located
on 55 acres near Wellsboro, Pennsylvania (Tioga County). Laboratory
facilities include 3 modern buildings, 8x200-foot concrete raceways, 3
production wells, and support equipment.

The RDL-W conducts research for restoration of depleted fisheries and
other aquatic biological resources. A diversified research program in
ecology, conservation technology, genetics, and physiology emphases
the integration of laboratory and field studies to develop
scientifically sound approaches to the management of aquatic
ecosystems. Research is directed primarily towards development of
information and technology to increase understanding of aquatic
ecosystems in the northeastern United States and to assist client
agencies to better manage these ecosystems and their biota. Technical
assistance is provided to clients throughout the nation.