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Titolo:
EARLY SURVIVAL IN ROE DEER - CAUSES AND CONSEQUENCES OF COHORT VARIATION IN 2 CONTRASTED POPULATIONS
Autore:
GAILLARD JM; BOUTIN JM; DELORME D; VANLAERE G; DUNCAN P; LEBRETON JD;
Indirizzi:
UNIV LYON 1,UMR 5558,LAB BIOMETRIE GENET & BIOL POPULAT,43 BLVD 11 NOVEMBRE 1918 F-69622 VILLEURBANNE FRANCE DIRECT RECH & DEV,OFF NATL CHASSE F-75017 PARIS FRANCE CTR ETUD BIOL CHIZE,CNRS,UPR 4701 F-79360 BEAUVOIR NIORT FRANCE CEFE,CNRS F-34293 MONTPELLIER 5 FRANCE
Titolo Testata:
Oecologia
fascicolo: 4, volume: 112, anno: 1997,
pagine: 502 - 513
SICI:
0029-8549(1997)112:4<502:ESIRD->2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
WHITE-TAILED DEER; CAPREOLUS-CAPREOLUS; RED DEER; JUVENILE MORTALITY; DEMOGRAPHIC TACTICS; MATERNAL INVESTMENT; CAPTURE-RECAPTURE; GENETIC-VARIATION; SOUTH TEXAS; MULE DEER;
Keywords:
UNGULATES; POPULATION DYNAMICS; DENSITY DEPENDENCE; ENVIRONMENTAL VARIATION; SEXUAL SELECTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
95
Recensione:
Indirizzi per estratti:
Citazione:
J.M. Gaillard et al., "EARLY SURVIVAL IN ROE DEER - CAUSES AND CONSEQUENCES OF COHORT VARIATION IN 2 CONTRASTED POPULATIONS", Oecologia, 112(4), 1997, pp. 502-513

Abstract

Time-and sex-specific summer survival of roe deer fawns was estimatedusing capture-mark-recapture methods in two enclosed populations living in contrasting conditions. The population of Trois Fontaines (eastern France) was roughly constant in size throughout the study period, while in Chize (western France), the population experienced frequent summer droughts and numbers decreased continuously during the study. Early survival of fawns was low and highly variable over the years at both Chize and Trois Fontaines, and demonstrated marked variations between cohorts that need to be taken into account when modelling roe deer population dynamics. In Trois Fontaines: fawn survival was positively correlated with early body growth and total rainfall in May and June. In Chize, fawn survival decreased with increasing density and tended toincrease with increasing rainfall in May and June and adult: female body mass. These factors explained more than 75% of the variability in early survival observed in both populations. Variation between cohortshad different consequences for the two populations, At Trois Fontaines, cohort variation was limited to a numerical effect on early survival. However at Chize, cohort variation was long-lasting and affected the phenotypic quality of survivors at later ages, and thereby future survival and breeding abilities (both numerical and quality effects). Male and female Fawns had similar survival over their first summer in both populations. This result contrasts with the lower survival elf young males often observed in ungulates. Two ultimate causes can be proposed to account for the low and variable survival of roe deer fawns overthe first summer: the high energy expenditures incurred by does during each breeding attempt and/or the low absolute body size of newborn roe deer fawns.

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Documento generato il 01/12/20 alle ore 10:58:26