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Increased Egg Conservation-Is It Essential For Recovery Of Whooping Cranes In The Aransasiwood Buffalo Population?, James C. Lewis
Increased Egg Conservation-Is It Essential For Recovery Of Whooping Cranes In The Aransasiwood Buffalo Population?, James C. Lewis
Proceedings of the North American Crane Workshop
The whooping crane (Grus americana) is in a race for survival against adversities (genetic, demographic, and environmental) that are only partially understood. There is increasing evidence of genetic problems (drift, inbreeding, and loss of heterozygosity) in the captive population that likely also exist in the wild Aransas-Wood Buffalo Population (A WP), a consequence of the 1940s population bottleneck. Small populations are vulnerable to extinction through catastrophic events and random changes in productivity or survival. Negative environmental effects faced by whooping cranes include upstream diversion which diminish freshwater (nutrient) inflow into Texas wintering habitats, and expanding human activities along …
Whooping Crane Egg Management: Options And Consequences, David H. Ellis, George F. Gee
Whooping Crane Egg Management: Options And Consequences, David H. Ellis, George F. Gee
Proceedings of the North American Crane Workshop
Eggs to build captive whooping crane (Grus americana) flocks and most eggs for reintroduction experiments have come from second viable eggs in 2-egg clutches in Canada. Four years ago, egg removal ceased. Based on reproductive rates for years when second eggs were removed and for years when eggs were not removed, we project numbers of young fledging in the wild and in captivity for the 2 most likely egg-management strategies. From existing data sets, we find that reproductive performance was, on average, better during the era of routine removal of the second viable eggs than when no manipulation …