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Titolo: Optimal harvest of agestructured populations of moose Alces alces in a fluctuating environment
Autore: Saether, BE; Engen, S; Solberg, EJ;
 Indirizzi:
 Norwegian Inst Nat Res, N7485 Trondheim, Norway Norwegian Inst Nat Res Trondheim Norway N7485 N7485 Trondheim, Norway Norwegian Univ Sci & Technol, Dept Math Sci, N7491 Trondheim, Norway Norwegian Univ Sci & Technol Trondheim Norway N7491 1 Trondheim, Norway Norwegian Inst Nat Res, N7485 Trondheim, Norway Norwegian Inst Nat Res Trondheim Norway N7485 N7485 Trondheim, Norway
 Titolo Testata:
 WILDLIFE BIOLOGY
fascicolo: 3,
volume: 7,
anno: 2001,
pagine: 171  179
 SICI:
 09096396(200109)7:3<171:OHOAPO>2.0.ZU;2S
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 LIFEHISTORY; BODYMASS; LARGE HERBIVORES; NORWEGIAN MOOSE; CARCASS WEIGHT; DYNAMICS; CONSERVATION; NORWAY; SIZE; STRATEGIES;
 Keywords:
 agespecific harvesting; density dependence; environmental stochasticity; moose; stochastic population dynamics;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Agriculture,Biology & Environmental Sciences
 Citazioni:
 47
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Saether, BE Norwegian Inst Nat Res, Tungasletta 2, N7485 Trondheim, Norway Norwegian Inst Nat Res Tungasletta 2 Trondheim Norway N7485



 Citazione:
 B.E. Saether et al., "Optimal harvest of agestructured populations of moose Alces alces in a fluctuating environment", WILDL BIOL, 7(3), 2001, pp. 171179
Abstract
We analysed sex and agespecific harvesting strategies of moose using an agestructured population model that includes density dependence as well asenvironmental stochasticity. In order to find the strategy that maximises the mean annual yield we simulated the process over a large number of years. The mean annual yield is a function of the three parameters (number of harvested individuals of calves, adult (greater than or equal to1 1/2 years old) bulls and adult females) that are involved in the definitions of the strategies. We compare, by numerical maximisation of a function in several variables, two harvest strategies: proportional harvesting, i.e. removal of acertain proportion of individuals in a given age and sexclass, and threshold harvesting, i.e. all individuals of a given sex and ageclass are harvested when the size of this subpopulation exceeds a certain threshold. In general, proportional harvest gives a smaller mean annual yield than threshold harvesting. The variance in the annual yield is, however, larger for threshold than for proportional harvesting. These differences between the two harvest strategies increase when the annual survival of calves is low, whenthere is high environmental stochasticity and when there is strong densityregulation operating on survival. For both harvest strategies, the optimalharvest strategy involves high harvest of calves and adult buns, whereas adult females should hardly be harvested.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 15:28:43