expected to last 24 months. Tracking data indi-
investigation: Evaluation of white phosphorus con-
cated that transmitters did not appear to inhibit
tamination and potential treatability at Eagle River
the movements or activities of either ducks or
Flats, Alaska (C.H. Racine and D. Cate, Ed.). CR-
bald eagles. Daily waterfowl movements indicate
REL Contract Report to U.S. Army Garrison, Alas-
ka, Directorate of Public Works, FY93 Final Re-
that all species moved among areas quite readily.
port, p. 227234.
Mallards spent about 60% of their time in Areas B
We determined the movement, distribution,
and A; pintails spent about 87% of their time in
turnover rate, and site-specific exposure of water-
Areas A, C/D, and D; and teal spent about 63% of
fowl species most susceptible to white phospho-
their time in Areas A and D. After the hazing pro-
rus poisoning at Eagle River Flats during fall
gram was started, waterfowl use patterns
migration (August-September) 1993.
changed on ERF. The average number of days
We captured 62 ducks of five species, mainly in
spent on ERF by mallards, pintails, and teal was
Areas C, C/D, and Bread Truck with mist nets
40, 46, and 27 days, respectively. The average
and swim-in traps. Of those, radio transmitters
daily turnover rate for waterfowl was about 3.8%.
were attached to 12 mallards, 11 pintails and 11
The greatest turnover of waterfowl occurred pri-
green-winged teals. Tracking data indicate that
or to 5 September, when 47% of mallards, 37% of
during August (before hazing), telemetry species
pintails and 43% of teal departed ERF. The mor-
tality of instrumented ducks using ERF from 1
ranged over the entire Flats. Mallards tended to
August to 17 October was five ducks, or about
concentrate in Areas A and B, Racine Island and
the C/D transition. Pintails used Area C and
9%. Most of the telemetry contacts with eagles,
Bread Truck. Green-winged teal used the C/D
excluding the two nesting birds, indicated that
transition area and shallow pools in Areas A and
eagles spent an average of 1.4 days on the Flats.
C. After hazing, most waterfowl concentrated in
Instrumented eagles were only observed in Areas
Area B and the C/D transition area. Preliminary
A, C, and C/D during the spring and A and C/D
data suggest that there was a low turnover rate of
during the fall. The nesting success of eagles on
waterfowl species using the Flats during August
ERF did not differ significantly from eagles nest-
and September. In addition, eight telemetry
ing on Susitna or Chickaloon Flats. Eagles on ERF
ducks were found dead on ERF: Racine Island (1),
produced an average of 1.3 eggs and fledged an
Area A (3), Area C (2), and the C/D transition
average of 0.33 eaglets. No adult eagle mortality
area (2).
has been documented from instrumented birds,
even though eagles scavenge dead ducks (which
has included instrumented ducks).
Cummings, J.L., C.A. Yoder, R.E. Johnson, P.A.
Pochop, K.S. Gruver, J.E. Davis, and K.L. Tope
(1996) Movement, distribution, and relative risk
Cummings, J.L., C.A. Yoder, R.E. Johnson, P.A.
of waterfowl and bald eagles using Eagle River
Pochop, K.S. Gruver, J.E. Davis, K.L. Tope, J.B.
Bourassa, and R.L. Phillips (1995) Movement,
Flats. In Interagency expanded site investigation:
distribution, and relative risk of waterfowl, bald