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At least 307 records · Page 17Linked to original sources
USGS1981

Sampling strategies for radio-tracking coyotes

Ten coyotes radio-tracked for 24 h periods were most active at night and moved little during daylight hours. Home-range size determined from radio-locations of 3 adult coyotes increased with the number of locations until an asymptote was reached at about 35-40 independent day locations or 3 6 nights of hourly radio-locations. Activity of the coyote did not affect the asymptotic nature of the home-range calculations, but home-range sizes determined from more than 3 nights of hourly locations were considerably larger than home-range sizes determined from daylight locations. Coyote home-range sizes were calculated from daylight locations, full-night tracking periods, and half-night tracking periods. Full- and half-lnight sampling strategies involved obtaining hourly radio-locations during 12 and 6 h periods, respectively. The half-night sampling strategy was the best compromise for our needs, as it adequately indexed the home-range size, reduced time and energy spent, and standardized the area calculation without requiring the researcher to become completely nocturnal. Sight tracking also provided information about coyote activity and sociability.

Wildlife Society Bulletin↗
USGS1982

Lead shot incidence in sediments and waterfowl gizzards from Merrymeeting Bay, Maine

Lead shot in bottom sediments from Merrymeeting Bay, Maine, averaged 99,932 shot/ha. More shot (P < 0.05) was present in silt sediments than in sand sediments. Number 6 size shot was the most abundant in all 6 river deltas sampled. Ingested lead shot occurred in gizzards of 6 of 10 waterfowl species. Lead shot occurred in 5.9-8.1% of the black ducks (Anas rubripes) sampled during the hunting seasons of 1976-80. A comparison of 3 gizzard examination methods showed that visual examination of gizzard contents and x-ray examination of contents did not differ in accuracy, but fluoroscopic x-ray examination of intact gizzards was not satisfactory for detecting ingested shot. Projected waterfowl mortality and the effectiveness of the steel shot regulation in reducing lead deposition into the environment are discussed.

Wildlife Society Bulletin↗
USGS1982

Shotshell and shooter effectiveness: Lead vs. steel shot for duck hunting

Shooter and shotshell effectiveness were tested during the 1979 waterfowl season at the Schell-Osage Wildlife Management Area (WMA), Missouri. Hunters who participated in the study bagged 1,967 ducks with 10,587 shots. No significant differences in bagging, crippling, or missing rates were measured among 4 Winchester 12 gauge loads: #4 buffered and unbuffered lead and #4 and #2 steel. Shooter effectiveness declined as distance increased. Crippling rates were not influenced by distance. Hunters reported good shotshell performance for all shells but indicated negative attitudes toward steel shot.

Wildlife Society Bulletin↗
USGS1984

Radio-triggered anesthetic-dart collar for recapturing large mammals

A re-usable, radio-triggered, anesthetic-dart collar costing about $1,200 has been developed for recapturing large, free-ranging mammals. The collar was tested successfully on captive gray wolves, white-tailed deer, a mountain lion, a black bear, and a tiger, and on wild wolves, a bear, and deer after periods of up to 32 days. The main advantage of the capture collar is that it allows frequent recapture of individuals at will and thus enhances opportunities for new physiological monitoring of wild animals.

Wildlife Society Bulletin↗
USGS1986

Effects of liberalized harvest regulations on wood ducks in the Atlantic Flyway

Beginning in 1977the FWS provided southern Atlantic Flyway states the opportunity to liberalize wood duck harvest regulations. Harvest subsequently increased throughout the flyway but appeared to be more a function of population growth than changes in regulations. In the South, harvest rate increased only slightly for young males and no decline in average survival was detected. We found no evidence of increased harvest pressure on nontarget northern populations. We concluded that liberalized regulations provided increased hunting opportunities in southern states without adversely impacting northern populations.

Wildlife Society Bulletin↗
USGS1986

Radiotelemetry locates wintering grounds of DDE-contaminated black-crowned night-herons

This study was designed to determine if night-herons nesting at Ruby Lake, Nevada, shared a common wintering area with lesser contaminated night-herons nesting farther north in Oregon and Idaho. Radiotelemetry (29 transmitters) and banding studies indicated that the lesser-contaminated Oregon-Idaho night-herons wintered primarily in coastal Mexico (mean 22-23'N latitude), while the Ruby Lake night-herons wintered in the southwestern United States with some in the interior of northern Mexico (mean 29-30?N latitude). We believe the nearly disjunct wintering areas for the populations, and the apparent differing pollutant loads on the wintering areas accounted for the 3-fold higher DDE egg residues at Ruby Lake. Findings from this study emphasize the influence migration patterns can have on pollutants accumulated by populations of migratory birds nesting in relatively unpolluted areas and at relatively short distances apart (400 km).

Wildlife Society Bulletin↗
USGS1986

Bird poisoning from misuse of the carbamate Furadan in a Texas rice field

More than 100 birds consisting largely of dickcissels and savannah sparrows, as well as 9 other species of songbirds and sandpipers, died from feeding on planted rice seed treated illegally with Furadan 4F. Brain ChE activity was depressed between 32-85% in 44% of the birds. Carbofuran residues in GI tract contents of birds averaged 3.4 ppm (0.54-10 ppm). Two samples of planted rice seed contained 91 ppm and 22 ppm carbofuran. Known mortality of birds continued for about 2 weeks.

Wildlife Society Bulletin↗