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Full-Text Articles in Physical Sciences and Mathematics
Black Bear Damage To Lodgepole Pine In Central Oregon, Victor G. Barnes Jr., Richard M. Engeman
Black Bear Damage To Lodgepole Pine In Central Oregon, Victor G. Barnes Jr., Richard M. Engeman
USDA Wildlife Services: Staff Publications
Black bear (Ursus amerlcanus) damage to 108 lodgepole pine (Pinus contorta) trees was found in a mixed conifer habitat in central Oregon. No trees of three other conifer species were injured. Eighty-nine percent of the damage occurred in the same year. Nearly 20% of the freshly damaged trees had bark removed from more than 75% of the circumference and, judging from the fate of trees damaged in prior years, probably succumbed.
Foraging Behaviors Of Snowy Egrets (Egretta Thula) And Yellow-Crowned Night-Herons (Nyctanassa Violacea) In South Louisiana, D. Tommy King, Dwight Leblanc
Foraging Behaviors Of Snowy Egrets (Egretta Thula) And Yellow-Crowned Night-Herons (Nyctanassa Violacea) In South Louisiana, D. Tommy King, Dwight Leblanc
USDA Wildlife Services: Staff Publications
We report two previously undescribed foraging techniques used by Snowy Egrets (Egretta thula) and Yellow-crowned Night-Herons (Nyctanassa violacea) to catch crawfish (Procambarus spp.). Snowy Egrets were selecting crawfish that had recently molted their shells and Yellow-crowned Sight-Herons were targeting crawfish that were emerging from their burrows. These observations were conducted on commercial crawfish ponds near Catahoula, LA, USA.
Abundance Of Gulls And Other Birds At Landfills In Northern Ohio, Jerrold L. Belant, Thomas W. Seamans, Steven W. Gabrey, Richard A. Dolbeer
Abundance Of Gulls And Other Birds At Landfills In Northern Ohio, Jerrold L. Belant, Thomas W. Seamans, Steven W. Gabrey, Richard A. Dolbeer
USDA Wildlife Services: Staff Publications
We estimated the abundance of birds at three landfills in northern Ohio from May 1991-July 1992 recording 699,350 individuals of 42 species. Gulls (Larus spp.) comprised 94.5% of the birds recorded followed by European starlings (Sturnus vulgaris, 5.0%) and turkey vultures (Cathartes aura, 0.3%). Gulls were primarily of two species, ring-billed (L. delawarensis, 74.49%) and herring (L. argentatus, 25.50%). The mean number of gulls per observation during July-January was at least five times the mean number observed during other months. The combined monthly mean number of gulls at the three landfills peaked in August (>4000 birds), with gulls virtually …
Feeding Responses To Predator-Based Repellents In The Mountain Beaver (Aplodontia Rufa), Gisela Epple, J. Russell Mason, Evgueny Aronov, Dale L. Nolte, Richard Hartz, Ron Kaloostian, Dan Campbell, Amos Smith Iii
Feeding Responses To Predator-Based Repellents In The Mountain Beaver (Aplodontia Rufa), Gisela Epple, J. Russell Mason, Evgueny Aronov, Dale L. Nolte, Richard Hartz, Ron Kaloostian, Dan Campbell, Amos Smith Iii
USDA Wildlife Services: Staff Publications
Predator odors have potential as feeding repellents for mammalian herbivores, including Aplodontia rufa, the mountain beaver. However, the repellency of major chemical constituents of natural predator scents for this species has not been evaluated. In this study, the effects of several synthetic sulfur compounds from predator scents on feeding by mountain beavers were assessed and compared to the effects of coyote (Canis latrans) urine. Retrieval of food by mountain beavers from bowls scented with either coyote urine, diluted with water to different concentrations, synthetic components of predator scents, or control odorants was studied. The following synthetic compounds …
American Woodock Use Of A Nest Box, David L. Bergman, Joel M. Bergman
American Woodock Use Of A Nest Box, David L. Bergman, Joel M. Bergman
USDA Wildlife Services: Staff Publications
-Lombardo et al. (1989, Condor 91 :744-747) reviewed two hypotheses for the use of nest boxes by house sparrows Passer domesticus, European starlings Sturnus vulgaris, eastern bluebirds Sialia sialis, and great tits Passer major during the nonbreeding season: (1) roosting in nest cavities may be associated with nest-cavity selection during intense competition for a limited number of usable cavities, and (2) birds use cavities during the non breeding season to decrease the rate of heat loss. We were unable to locate any prior documentation of nest box use by American woodcock (Scolopax major), therefore we report on a new behavior …
Birds Associated With Blackbird Spring Feeding Sites In South Dakota, George M. Linz, David L. Bergman, William J. Bleier
Birds Associated With Blackbird Spring Feeding Sites In South Dakota, George M. Linz, David L. Bergman, William J. Bleier
USDA Wildlife Services: Staff Publications
From 2 to 16 April 1993, we conducted road-side surveys of birds using harvested fields of small grains, soybeans, and wm within 8 km of two blackbird roosts in east central South Dakota. Blackbirds, waterfowl, killdeer, homed larks, ring-necked pheasants, and western meadowlarks were the most common buds recorded. The frequencies of blackbirds, non-game birds, terrestrial game birds, and waterfowl was not equally distributed within the three habitats (P = 0.U.23).