Neotropic Cormorant (Phalacrocorax brasilianus) Population Trends and Dynamics in Texas

Authors

Raymond C. Telfair II

Publication Date

6-1-1995

Abstract

This study analyzes range expansion, population trends, reproductive success, band recoveries, and sightings of color-marked Neotropic Cormorants (Phalacrocorax brasilianus) in Texas. After a drastic population decline in coastal breeding colonies in the 1960s, they have established new coastal and inland colonies since 1973. Their population fluctuates; but, is steadily increasing. Breeding success in inland colonies may be higher than in coastal colonies because of fewer adverse factors. Although band recoveries and sightings of color-marked birds are few, post-breeding dispersal of juveniles is apparently not far from the natal colony. Southward fall/winter movement may occur. Sightings of marked birds establish that sexual maturity is reached at about 1 year of age. Key words: Neotropic Cormorant; Phalacrocorax brasilianus; range expansion; population trends; reproductive success; band recoveries; color-markers.

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Recommended Citation

Telfair, Raymond C. II (1995) "Neotropic Cormorant (Phalacrocorax brasilianus) Population Trends and Dynamics in Texas," Bulletin of the Texas Ornithological Society: Vol. 28: Iss. 1, Article 4.
Available at: https://digitalcommons.usf.edu/tos_bulletin/vol28/iss1/4