The second set of DFAs detected significant differences between depredated
and successful nests for Blue-winged Teal and Gadwall (Table 2, bottom parts of Figs.
Two of the snakes from the Cass County site were depredated
We successfully captured predation events at six of the nine depredated
First, we conducted an accessory experiment near Juneau in 1994 (during T1 only) to see if ground nests with smaller eggs were depredated
at rates different from similar nests with the standard Japanese Quail eggs.
The remaining depredated
cavity was chiseled out along the cavity perimeter, and the nestlings appeared to have been pecked at repeatedly, suggesting depredation by a pileated woodpecker (Dryocopus pileatus).
Nests were classified as depredated
if all eggs or nestlings disappeared.
The percent of hunting mortality is most likely an underestimate because dead radio-marked mallards without visible signs of being shot were classified as non-hunting mortalities and hunter-killed carcasses were nearly always depredated
before being recovered.
eggs with rounded openings were generally considered a sign of avian predators, as were nests with fresh down and no eggs or eggshell fragments.
nests are quite cryptic, at least to human observers, and depredated
nests may differ in structure from those that escape predation [Petersen and Best 1985a, b, Rich 1980a; J.
Here we report the first case of a blackcapped vireo (Vireo atricapilla), a federally endangered species, reusing a nest after being parasitized by a brown-headed cowbird (Molothrus ater) and later depredated
We have not observed depredated
nests of yellow mud turtles, although we have found opened nests of western painted turtles and red-eared sliders (Trachemys scripta).
Parameter (monthly mortality) Estimate SE Depredated
by mammals 0.
For each common eider nest observed, information was recorded on apparent clutch size, nest age, and nest status (incubating, hatching, hatched, depredated
, or unknown).
Half the number of days between subsequent visits during which interval a nest was depredated
was added to the number of previous days the nest survived, to obtain total exposure days observed.
2006, we found one male depredated
while a second male went missing because of radio-transmitter failure but was recaptured in Sept.