Sex- and age-biased mortality in wild Grey Partridge Perdix
perdix populations

RYMEŠOVÁ, Dana, Petr ŠMILAUER and Miroslav ŠÁLEK. Sex- and age-biased mortality in wild Grey Partridge Perdix perdix populations. IBIS. HOBOKEN: WILEY-BLACKWELL, vol. 154, No 4, p. 815-824. ISSN 0019-1019. doi:10.1111/j.1474-919X.2012.01259.x. 2012.

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TY  - JOUR
ID  - 988349
AU  - Rymešová, Dana - Šmilauer, Petr - Šálek, Miroslav
PY  - 2012
TI  - Sex- and age-biased mortality in wild Grey Partridge Perdix perdix populations
JF  - IBIS
VL  - 154
IS  - 4
SP  - 815-824
EP  - 815-824
PB  - WILEY-BLACKWELL
SN  - 00191019
KW  - Cox proportional hazard model
KW  - radiotracking
KW  - survival
UR  - http://onlinelibrary.wiley.com/doi/10.1111/j.1474-919X.2012.01259.x/abstract
L2  - http://onlinelibrary.wiley.com/doi/10.1111/j.1474-919X.2012.01259.x/abstract
N2  - 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.
ER  -

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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Sex- and age-biased mortality in wild Grey Partridge Perdix perdix populations

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