Nelson Consulting Inc.


NCI biologists conducted field surveys for the southwest willow flycatcher (Empidonax traillii extimus) under contract with the U.S. Bureau of Reclamation on the San Juan River below Navajo Dam during the two seasons. River habitats were surveyed using the U.S. Fish and Wildlife Service survey protocols. Ten migrating individual birds were located during the first survey season.

The Bureau of Land Management required a survey and study of gray vireo (Vireo vicinior) behavior as mitigation for seismic survey operations. NCI biologist located breeding bird territories in two separate study areas, Rosa Mesa and Crow Mesa, New Mexico. Biologists monitored nest behavior during the 2010 breeding season. Territory size was measured and nesting success was recorded. Vegetation at the nest tree locations was also recorded, measured, and analyzed to provide data for nest preference of gray vireos. This data will assist BLM and other wildlife agencies in determining population and breeding trends for the species.


Typical Survey Habitat on San Juan River Below Navajo Dam

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