Abstract
The average number of hawks observed per hour in autumn migration between 1951–1954 and 1958–1961 at White Marsh, Maryland, was compared. The counts indicated that the status of the ten species observed may be divided into three categories: (1) relatively stable species (red-tailed hawk), (2) declining species (sparrow hawk, red-shouldered hawk, osprey, marsh hawk, and broad-winged hawk), and (3) rapidly declining species (peregrine falcon, Cooper’s hawk, bald eagle, and sharp-shinned hawk). The findings from this study are in agreement with the available literature and the status of the populations appears to be related to the food habits of the species.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Literature Cited
BERGER, D. D., C. R. SINDELAR, and K. E. GAMBLE. 1969. The status of breeding peregrines in the eastern United States, p. 165–173.In J. J. Hickey [ed.] Peregrine falcon population their biology and decline. Univ. Wisconsin Press, Madison.
ENDERSON, J. H. 1965. A breeding and migration survey of the peregrine falcon.Wilson Bull. 77(4):327–339.
FYFE, R. 1969. The peregrine falcon in northern Canada, p. 101–114.In J. J. Hickey [ed.] Peregrine falcon populations their biology and decline. Univ. Wisconsin Press, Madison.
HAMERSTROM, F. 1969. A harrier population study, p. 367–383.In J. J. Hickey [ed.] Peregrine falcon populations their biology and decline. Univ. Wisconsin Press. Madison.
HEATH, R. G., J. W. SPANN, and J. F. KREITZER. 1969. Marked DDE impairment of mallard reproduction in controlled studies.Nature 224(5214):47–48.
HENNY, C. J. 1969. Geographical variation in mortality rates and production requirements of the barn owl (Tyto alba ssp).Bird-Banding 40(4):277–290.
— 1970. An analysis of the population dynamics of selected avian species. PhD. dissertation, Oregon State University, Corvallis. 188 p.
—, and J. C. OGDEN. 1970 Estimated status of osprey populations in the United States.J. Wildl. Mgmt. 34(1):214–217.
—, W. S. OVERTON, and H. M. WIGHT. 1970. Determining parameters for populations by using structural models.J. Wildl. Mgmt. 34(4):690–703.
—, and H. M. WIGHT. 1969. An endangered osprey population: estimates of mortality and production.Auk 86(2):188–198.
HENNY, C. J., and H. M. WIGHT (in press) Population ecology and environmental pollution: red-tailed and Cooper’s hawks. Research Rept. Bureau of Sport Fisheries and Wildlife, Washington, D.C.
HICKEY, J. J. 1969. DDT and birds: Wisconsin, 1968.Atlantic Nat. 24(2):86–92.
—, and D. W. ANDERSON. 1968. Chlorinated hydrocarbons and egg-shell changes in raptorial and fish-eating birds.Science 162(3850):271–273.
KEITH, J. A. 1969. Some results and implications of pesticide research by the Canadian Wildlife Service.Trans. Federal-Provincial Wildl. Conf. 33:27–30.
LEOPOLD, A. 1933. Game Management. Charles Scribner’s Sons, New York, 481 p.
MOORE, N. W. 1966. A pesticide monitoring system with special reference to the selection of indicator species.J. Applied Ecology 3(suppl.):261–269.
PETERSON, R. T. 1964. Introduction to the Dover edition. Bird studies at Old Cape May., Dover Publications, New York.
— 1969a. Population trends of ospreys in the northeastern states, p. 333–337.In J. J. Hickey [ed.] Peregrine falcon populations their biology and decline. Univ. Wisconsin Press, Madison.
— 1969b. The contamination of food chains, p. 529–534.In J. J. Hickey [ed.] Peregrine falcon populations their biology and decline. Univ. Wisconsin Press, Madison.
PORTER, R. D. and S. N. WIEMEYER. 1969. Dieldrin and DDT: effects on sparrow hawk eggshells and reproduction.Science 165(3889):199–200.
RATCLIFFE, D. A. 1967. Decrease in eggshell weight in certain birds of prey.Nature 215(5097):208–210.
SCHMID, F. C. 1966. The status of the osprey in Cape May County, New Jersey between 1939 and 1963.Chesapeake Sci. 7(4):220–223.
— [1968]. Numbers of eggs and young of bald eagles in four middle Atlantic states.Cassinia 50:15–17.
SWINEBROAD, J. 1960. A review of some problems in the study of bird migration.Ohio J. Sci. 60(3):174–182.
Author information
Authors and Affiliations
Additional information
Technical paper No. 2899. Oregon Agricultural Experiment Station, Corvallis, Oregon.
Rights and permissions
About this article
Cite this article
Hackman, C.D., Henny, C.J. Hawk migration over white marsh, Maryland. Chesapeake Science 12, 137–141 (1971). https://doi.org/10.2307/1350773
Issue Date:
DOI: https://doi.org/10.2307/1350773