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Titolo:
Viability of the southern elephant seal population of the Falkland Islands
Autore:
Galimberti, F; Sanvito, S; Boitani, L; Fabiani, A;
Indirizzi:
Elephant Seals Res Grp, I-20145 Milan, Italy Elephant Seals Res Grp Milan Italy I-20145 Res Grp, I-20145 Milan, Italy Mem Univ Newfoundland, Dept Biol, St Johns, NF A1B 3X9, Canada Mem Univ Newfoundland St Johns NF Canada A1B 3X9 ohns, NF A1B 3X9, Canada Univ Rome La Sapienza, Dipartimento Biol Anim & Uomo, I-00185 Rome, Italy Univ Rome La Sapienza Rome Italy I-00185 nim & Uomo, I-00185 Rome, Italy Univ Durham, Dept Biol Sci, Durham DH1 3LE, England Univ Durham Durham England DH1 3LE ept Biol Sci, Durham DH1 3LE, England
Titolo Testata:
ANIMAL CONSERVATION
, volume: 4, anno: 2001,
parte:, 1
pagine: 81 - 88
SICI:
1367-9430(200102)4:<81:VOTSES>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
MIROUNGA-LEONINA; GENETIC-VARIATION; MARINE MAMMALS; FUR SEALS; CALIFORNIA; PROBABILITY; MEANINGFUL; EXTINCTION; MORTALITY; DYNAMICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Galimberti, F Via Buonarroti 35, I-20145 Milan, Italy Via Buonarroti 35 Milan Italy I-20145 I-20145 Milan, Italy
Citazione:
F. Galimberti et al., "Viability of the southern elephant seal population of the Falkland Islands", ANIM CONSER, 4, 2001, pp. 81-88

Abstract

Accurate long-term series of demographic data are available for most populations of southern elephant seals. However, research on the elephant seals of the Falkland Islands began only recently, and information for an accurate forecasting of the future of this population is lacking. In this paper wepresent data on the current status of the population and its trend in sizeduring the last Il years. We built an age-structured model of the population and analyzed the effect of variation in demographic parameters on population growth. Elasticity analysis demonstrated that variation in mortality has a more pronounced effect on instantaneous growth rate than an equivalentvariation in fecundity. We examined the effects of environmental variability, inbreeding and catastrophes on population viability by a computer simulation using the VORTEX PVA programme. In the stochastic model, the most important factor affecting extinction risk was variability in mortality rates,in particular of the adult classes. We concluded that, although the population does not appear to be at immediate risk of extinction, its small size and isolation make it necessary to accurately monitor the population trendsand to acquire additional information on life history and feeding strategies.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 10:40:21