Publication Date
9-1-2009
Abstract
Abundance and distribution of species tend to be linked, such that as outside forces cause changes in population size, there is often a change in the number of sites occupied. Presence-nonpresence surveys are a simple method for monitoring these changes and obtaining valuable information on avian assemblages and are arguably more accurate than point counts. We conducted presence-nonpresence surveys during spring, summer, and winter at 30 stations along the Blanco River in central Texas. We recorded 98 avian species on 267 presence-nonpresence surveys. Thirty species were analyzed in PRESENCE to obtain occupancy and detectability values. We compared survey results to birds observed on landowner surveys using the Jaccard Similarity Coefficient (J). There was not a strong similarity between the two types of surveys. Landowner surveys had a 51% similarity to our year-round presence-nonpresence avian surveys and 56% similarity to our spring and summer avian surveys.
Creative Commons License
Recommended Citation
Korn, Jennifer M.; Simpson, Thomas R.; Baccus, John T.; and Jester, Stephen L.
(2009)
"Evaluating Avian Communities of the Blanco River Valley Using Occupancy Modeling and Landowner Conducted Surveys,"
Bulletin of the Texas Ornithological Society: Vol. 42:
Iss.
2, Article 4.
Available at:
https://digitalcommons.usf.edu/tos_bulletin/vol42/iss2/4