Using avian radar to examine relationships among avian activity, bird strikes, and meteorological factors

Human-Wildlife Interactions
By: , and 

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Abstract

Radar systems designed to detect avian activity at airfields are useful in understanding factors that influence the risk of bird and aircraft collisions (bird strikes). We used an avian radar system to measure avian activity at Beale Air Force Base, California, USA, during 2008 and 2009. We conducted a 2-part analysis to examine relationships among avian activity, bird strikes, and meteorological and time-dependent factors. We found that avian activity around the airfield was greater at times when bird strikes occurred than on average using a permutation resampling technique. Second, we developed generalized linear mixed models of an avian activity index (AAI). Variation in AAI was first explained by seasons that were based on average migration dates of birds at the study area. We then modeled AAI by those seasons to further explain variation by meteorological factors and daily light levels within a 24-hour period. In general, avian activity increased with decreased temperature, wind, visibility, precipitation, and increased humidity and cloud cover. These effects differed by season. For example, during the spring bird migration period, most avian activity occurred before sunrise at twilight hours on clear days with low winds, whereas during fall migration, substantial activity occurred after sunrise, and birds generally were more active at lower temperatures. We report parameter estimates (i.e., constants and coefficients) averaged across models and a relatively simple calculation for safety officers and wildlife managers to predict AAI and the relative risk of bird strike based on time, date, and meteorological values. We validated model predictability and assessed model fit. These analyses will be useful for general inference of avian activity and risk assessment efforts. Further investigation and ongoing data collection will refine these inference models and improve our understanding of factors that influence avian activity, which is necessary to inform management decisions aimed at reducing risk of bird strikes.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Using avian radar to examine relationships among avian activity, bird strikes, and meteorological factors
Series title Human-Wildlife Interactions
Volume 5
Issue 2
Year Published 2011
Language English
Publisher Jack H. Berryman Institute
Publisher location Logan, UT
Contributing office(s) Western Ecological Research Center
Description 20 p.
First page 249
Last page 268
Time Range Start 2008-01-01
Time Range End 2009-12-31
Country United States
State California
Other Geospatial Beale Air Force Base
Online Only (Y/N) N
Additional Online Files (Y/N) N