Analytical Framework for Assessing Landbird Population Characteristics Described in New Report

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Scientists from USGS, NPS, and the Institute for Bird Populations developed a new framework for analyzing landbird population monitoring data from the NPS North Coast and Cascades Inventory and Monitoring Network (NCCN). 

This new tool combines several recent advances in population status and trends models using point-count data. The new tool was applied to data from 39 landbird species recorded in the three mountain parks of the NCCN, estimating trends and climate relationships for each species detected during 2005-2014 surveys. Advances supported by the new approach include the use of combined data on distance and time of detection to estimate detection probability without assuming perfect detection at zero distance, seamless accommodation of variation in sampling effort and missing data, and straightforward estimation of the effects of downscaled climate and other local habitat characteristics on spatial and temporal trends in landbird populations.

Ray, C., Saracco, J.F., Jenkins, K.J., Huff, M.H., Happe, P.J., Ransom, J.I., 2017, Development of a robust analytical framework for assessing landbird population trends, dynamics and relationships with environmental covariates in the North Coast and Cascades Network: National Park Service Natural Resources Report NPS/NCCN/NRR—2017/1483, p. 72.

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