Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Long-term estimates of adult survival rates of urban Herring Gulls Larus argentatus and Lesser Black-backed Gulls Larus fuscus

Rock, Peter and Vaughan, Ian Phillip 2013. Long-term estimates of adult survival rates of urban Herring Gulls Larus argentatus and Lesser Black-backed Gulls Larus fuscus. Ringing & Migration 28 (1) , pp. 21-29. 10.1080/03078698.2013.811179

Full text not available from this repository.

Abstract

Urban gull populations have increased dramatically in the last 40 years, leading to widespread concerns about potential nuisance to humans, but little accompanying research into their ecology. This study aimed to provide the first long-term estimates of apparent adult survival rates for urban Herring Gulls Larus argentatus and Lesser Black-backed Gulls L. fuscus, based on colour ringing in Bristol, southwest England. Resightings of adult birds covering 18 years (1990–2007) were analysed using capture–mark–recapture methods, with candidate models testing for differences in survival and/or resighting rate through time and between the sexes. Both species showed high apparent annual survival rates (>0.90) in the early 1990s that declined to <0.70 by 2007. Male survival rates were higher than female rates in Lesser Black-backed Gulls, and male resighting rates were higher in both species. In the early 1990s, Bristol's urban gulls displayed similar adult survival rates to published estimates for rural colonies. Both species showed evidence of long-term declines in apparent survival, which may either reflect actual reductions in survival or increased permanent emigration from the Bristol colony. Anecdotal evidence supports the latter, linking emigration to urban redevelopment or human intervention.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QL Zoology
ISSN: 0307-8698
Last Modified: 04 Jun 2017 05:14
URI: http://orca.cf.ac.uk/id/eprint/49889

Citation Data

Cited 4 times in Google Scholar. View in Google Scholar

Cited 8 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item