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Inventory & Monitoring

U.S. Fish and Wildlife Service policy directs refuges to use the best available science to conserve wildlife and their habitats, including methods for monitoring fish and wildlife populations. Aransas National Wildlife Refuge is doing this by applying the best science available to not only estimate how many whooping cranes are on the wintering grounds, but to also better understand the habitats they prefer.

  • Whooping Crane Winter Abundance


    This protocol is the first complete, peer-reviewed site-specific protocol (nation-wide) for the Inventory and Monitoring initiative within the National Wildlife Refuge System. It specifies the process that will now be used to estimate population abundance at the refuge during the winter season. For best results, open the link below using Acrobat X or Adobe Reader X (or a later version).

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  • Blue Crab Abundance


    Blue crabs are an important food source for over-wintering whooping cranes at Aransas National Wildlife Refuge. Understanding the relationship between whooping cranes and blue crabs is important.

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  • Wolfberry Production


    Whooping cranes depend on wolfberry early in the winter as a food source to regain energy after their long journey to the refuge for the winter. It is important for refuge managers to understand the impact of drought on berry production.

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Last Updated: Aug 11, 2014
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