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Titolo:
USE OF UNGULATES BY YELLOWSTONE GRIZZLY BEARS - URSUS-ARCTOS
Autore:
MATTSON DJ;
Indirizzi:
UNIV IDAHO,DEPT FISH & WILDLIFE RESOURCES,NATL BIOL SERV MOSCOW ID 83844
Titolo Testata:
Biological Conservation
fascicolo: 1-2, volume: 81, anno: 1997,
pagine: 161 - 177
SICI:
0006-3207(1997)81:1-2<161:UOUBYG>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
NATIONAL-PARK; POPULATION-DYNAMICS; CENTRAL ALASKA; BODY-WEIGHT; PREDATION; MOOSE; MORTALITY; SIZE; WOLVES; BISON;
Keywords:
GRIZZLY BEAR; ELK; BISON; MOOSE; UNGULATES; PREDATION; SCAVENGING AND YELLOWSTONE;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
104
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Mattson, "USE OF UNGULATES BY YELLOWSTONE GRIZZLY BEARS - URSUS-ARCTOS", Biological Conservation, 81(1-2), 1997, pp. 161-177

Abstract

Previous results of fecal analysis from the Yellowstone area and the known abilities of grizzly bears Ursus arctos to acquire and digest tissue from vertebrates suggested that grizzlies in this ecosystem obtained substantial energy from ungulates. This issue was addressed using observations from radio-marked grizzly bears, 1977-1992. Ungulates potentially contributed the majority of energy required for activity during the non-denning season for both adult female and male grizzlies. Most of this energy (95%) was estimated to come from the largest-bodied ungulate species (elk Cervus elaphus, bison Bison bison, and moose Alces alces), with greatest proportional contributions by scavenged adultmale bison (16%), scavenged calf and yearling elk (10%) and adult female elk that Mere killed (8%) or scavenged (8%). Grizzlies acquired 30% of total edibles from ungulates by predation, of which 13% (or 4% ofthe total) came from predation on elk calves. Most scavenging occurred during the spring and was associated with the abundance mid relativeavailability of different types of carrion. Predation and scavenging did not appear to be compensatory. Rather, total consumption of ungulates varied inversely with consumption of whitebark pine Pinus albicaulis seeds. The relative frequency of predation to scavenging increased with ungulate density. Contrary to previous suppositions, neither total ungulate use nor frequency of predation increased during the study, despite large increases in some ungulate populations. As expected by the identified trade-offs, Yellowstone grizzlies seemed to prey selectively upon moose, probably because of their solitary habits and forested surroundings, but otherwise favored vulnerable smaller-bodied ungulates such as elk calves. No predation on adult bison was observed. (C) 1997 Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 19:04:59