Variation in Electrocution Rate and Demographic Composition of Saker Falcons Electrocuted at Power Lines in Mongolia Dixon, A, Batbayar, N, Bold, B, Davaasuren, B, Erdenechimeg, T, Galtbalt, Batbayar, Tsolmonjav, P, Ichinkhorloo, S, Gunga, A, Purevochir, G and Rahman, ML 2020, Variation in Electrocution Rate and Demographic Composition of Saker Falcons Electrocuted at Power Lines in Mongolia, Journal of Raptor Research, vol. 54, no. 2, pp. 136-146, doi: 10.3356/0892-1016-54.2.136. Attached Files Name Description MIMEType Size Downloads Title Variation in Electrocution Rate and Demographic Composition of Saker Falcons Electrocuted at Power Lines in Mongolia Author(s) Dixon, A Batbayar, N Bold, B Davaasuren, B Erdenechimeg, T Galtbalt, Batbayar Tsolmonjav, P Ichinkhorloo, S Gunga, A Purevochir, G Rahman, ML Journal name Journal of Raptor Research Volume number 54 Issue number 2 Start page 136 End page 146 Total pages 11 Publisher p Publication date 2020-05-01 ISSN 0892-1016 Summary We examined variation in the number and demographic composition of electrocuted Saker Falcons (Falco cherrug) in Mongolia. We found 1721 electrocuted Saker Falcons during our surveys of multiple power lines in 2013-2015 and 2018. At a single power line surveyed over a 16-mo period in 2013-2014, the lowest electrocution rates occurred from December to March, with a rise in April coinciding with the return of migrant juveniles from their wintering areas. Electrocution rates rose sharply during juvenile post-fledging dispersal, and then declined in October as migrants departed. Monthly changes in electrocution rate and age profile reflected predicted variation in abundance and age structure of the local Saker Falcon population. We found that 88% of electrocuted Saker Falcons were juveniles, mostly killed during their first calendar year. The sex ratio of electrocuted juveniles fledged in the 2013 cohort (hatch-year birds) was significantly female-biased, in contrast to the equal sex ratio of the 2012 juvenile cohort (second calendar-year birds) killed in the same year (2013). Sex ratio of the 2013 juvenile cohort did not differ significantly from parity at other power lines across Mongolia, indicating that sex ratio of electrocuted juveniles can vary in time and space. The sex of electrocuted adults, predominantly males, and an age profile of breeding Saker Falcons that includes younger females suggests a possible male-biased sex ratio among adult Saker Falcons in Mongolia. Given that large numbers of endangered Saker Falcons are electrocuted annually in Mongolia, our study suggests electrocution may be an important driver of demographic trends that can potentially result in population declines. DOI 10.3356/0892-1016-54.2.136 Indigenous content off Field of Research 0608 Zoology Persistent URL http://hdl.handle.net/10536/DRO/DU:30162581 Document type: Journal Article Collections: Faculty of Science, Engineering and Built Environment School of Life and Environmental Sciences Related Links Link Description Connect to published version Go to link with your DU access privileges   Connect to Elements publication management system Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Thu, 17 Feb 2022, 07:32:59 EST Thu, 17 Feb 2022, 14:49:16 EST Thu, 17 Feb 2022, 14:55:49 EST Fri, 25 Mar 2022, 05:03:12 EST Fri, 13 May 2022, 11:22:24 EST Fri, 13 May 2022, 15:45:17 EST Filtered Full Citation counts:   Cited 5 times in TR Web of Science Cited 7 times in Scopus Search Google Scholar Access Statistics: 7 Abstract Views, 0 File Downloads  -  Detailed Statistics Created: Thu, 17 Feb 2022, 07:32:59 EST