Search USGS⌕ Search

Geology topics

M.G. Smart

Publications and source records attributed to M.G. Smart.

7 recordsLinked to original sources
USGS1965

Development and maturation of primary feathers of redhead ducklings

A comparison of the maturation rates of the primaries of redheads ( Aythya americana ) hatched very early with those hatched very late was made in the 1961 season. Primaries of the early-hatched birds emerged when the birds were 36-38 days old, those of the late-hatched birds when they were 7-10 days younger. This difference was also found in the age at first flight and the age at eventual maturation of all primaries. Primaries of late-hatched birds were significantly shorter in length when mature than were the primaries of early-hatched birds.

Journal of Wildlife Management↗
USGS1965

Body weights of newly hatched Anatidae

As early as 1928 (E.C. Meyers, Auk , 45: 334-388, 1928) investigators realized the importance of bird weights and appealed to ornithologists to record and publish records of these. Practically all of the weights of waterfowl that have been published, however, have been of adults or grown young (see F.H. Kortright, The ducks, geese and swans of North America , Amer. Wildl. Inst., 1943, pp. 381-388; F.C. Bellrose and A.S. Hawkins, Auk , 64: 422-430, 1947; A.L. Neldon and A.C> Martin, J. Wildl. Mgmt. , 17: 36-42, 1953; F.A. Hartman, Condor , 57: 221-238, 1955; and D.W. Johnston, Wilson Bull ., 75: 437, 1963). The purpose of this paper is to make available a record of weights of a number of species of newly hatched Anatidae.

The Auk↗