Datasets / Alaska-Yukon sandhill crane survey data, 1957-1980


Alaska-Yukon sandhill crane survey data, 1957-1980

Published By US Fish and Wildlife Service, Department of the Interior

Issued over 9 years ago

US
beta

Summary

Type of release
a one-off release of a single dataset

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Description

Sandhill cranes have been recorded on Alaska breeding pair surveys since 1957. Observations have been expanded for area only providing mean indexes of 2,200 for sprucemuskeg habitat, 26,500 for tundra habitat, and 28,800 for Alaska. These indexes have been further expanded with postulated visibility correction factors for respective habitats yielding mean populations of 23,100 for sprucemuskeg, 98,100 for tundra, and 121,700 for Alaska. Significant positive correlations r .22, p .01 for indexes; r 2 .27, p .01 for visibility corrected indexes result when breeding pair survey data is compared with Nebraska sandhill crane spring migration counts. The value of survey results could be increased with additional effort. The data shows an increase in the Alaska sandhill crane breeding population 195780, a 24 year period of consistent standard aerial waterfowl survey effort.