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At least 1,027 records · Page 57Linked to original sources
USGS1950

Birds of the season

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Atlantic Naturalist↗
USGS1996

Malocclusion in the jaws of captive bred Arctic wolves

Similar abnormalities in the skulls of captive Arctic Wolves (Canis lupus arctos) and a wild Arctic wolf found dead on Ellesmere Island, Canada, in 1986 are described. The malocclusion is likely to be recessively inherited and would be expressed more frequently in association with increased levels of inbreeding. A re-shaping of the skulls may have occurred due to the effects of the malocclusive trait. The Ellesmere skull was short and wide in comparison to the captive skulls which were long and narrow. The focus of effect was in a foreshortening of the rostrum and the resulting shortened toothrow.

Canadian Field-Naturalist↗
USGS1997

Watershield use by ring-necked ducks

During 1993-94 and 1994-95, the amount of watershield (Brasenia schreberi) in selected Maryland wetlands was determined to see if a relationship existed between the amount of watershield on a wetland and the number of ring-necked ducks (Aythya collaris) observed on that wetland. Data were collected for two years from eight different wetlands on the Patuxent Research Refuge in Laurel, Maryland. Results indicate there was no significant correlation between the amount of watershield in a wetland and the number of ring-necked ducks observed on that wetland.

Northeastern Naturalist↗