RYMEŠOVÁ, Dana, Petr ŠMILAUER and Miroslav ŠÁLEK. Sex- and age-biased mortality in wild Grey Partridge Perdix perdix populations. IBIS. HOBOKEN: WILEY-BLACKWELL, 2012, vol. 154, No 4, p. 815-824. ISSN 0019-1019. doi:10.1111/j.1474-919X.2012.01259.x.
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Basic information
Original name Sex- and age-biased mortality in wild Grey Partridge Perdix perdix populations
Authors RYMEŠOVÁ, Dana (203 Czech Republic, guarantor, belonging to the institution), Petr ŠMILAUER (203 Czech Republic) and Miroslav ŠÁLEK (203 Czech Republic).
Edition IBIS, HOBOKEN, WILEY-BLACKWELL, 2012, 0019-1019.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10613 Zoology
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
WWW Full Text
Impact factor Impact factor: 2.361
RIV identification code RIV/00216224:14310/12:00060529
Organization unit Faculty of Science
Doi http://dx.doi.org/10.1111/j.1474-919X.2012.01259.x
UT WoS 000310738900014
Keywords (in Czech) telemetrie; přežívání; Coxův model proporčních rizik
Keywords in English Cox proportional hazard model; radiotracking; survival
Tags AKR, rivok
Tags International impact, Reviewed
Changed by Changed by: Mgr. Marie Šípková, DiS., učo 437722. Changed: 16/12/2019 20:01.
Abstract
Differing reproductive effort, individual qualities and local environmental conditions can lead to uneven mortality risk among individuals within populations, and may result in survival differences according to age and sex. Identification of factors contributing to unequal operational sex ratios has been important for understanding population dynamics and conservation management. In this study, sex- and age-specific mortality was estimated in three wild Grey Partridge populations year round from analysis of radio-tracking data from a total of 168 individuals. Survival days were counted in three periods defined individually for each animal: the pairing period (covey break-up to laying of the first egg); the nesting period (between clutch initiation date and failure of the last nesting attempt, or the date when chicks were 14 days old); and the covey period (the end of the nesting period or joining a group until covey break-up). Predation was the main cause of mortality. A significant effect of age on survival was found during the pairing period, when older individuals paired off faster and survived better. The highest mortality risk overall was found during the nesting period. Furthermore, significantly higher mortality of females was recorded during the nesting period, suggesting that greater investments in reproduction, behaviour at the nest or the quality of nesting habitats can decrease survival of females and cause a male-biased sex ratio. No significant effect of age or sex was found during the covey period, nor for the year as a whole, but there was a significant difference in annual mortality rates between the three study populations. Our results confirm age- and sex-specific variation of adult mortality in a ground nesting bird with biparental care during the year-round cycle, documenting differing sensitivities of various population cohorts to predation.
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