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Titolo:
Effects of migratory geese on plant communities of an Alaskan salt marsh
Autore:
Zacheis, A; Hupp, JW; Ruess, RW;
Indirizzi:
Univ Alaska, Dept Biol & Wildlife, Fairbanks, AK 99775 USA Univ Alaska Fairbanks AK USA 99775 ol & Wildlife, Fairbanks, AK 99775 USA US Geol Survey, Alaska Biol Sci Ctr, Anchorage, AK 99503 USA US Geol Survey Anchorage AK USA 99503 ol Sci Ctr, Anchorage, AK 99503 USA Univ Alaska, Inst Arctic Biol, Fairbanks, AK 99775 USA Univ Alaska Fairbanks AK USA 99775 t Arctic Biol, Fairbanks, AK 99775 USA
Titolo Testata:
JOURNAL OF ECOLOGY
fascicolo: 1, volume: 89, anno: 2001,
pagine: 57 - 71
SICI:
0022-0477(200102)89:1<57:EOMGOP>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
LESSER SNOW GEESE; ABOVEGROUND PRIMARY PRODUCTION; PUCCINELLIA-PHRYGANODES; VERTEBRATE HERBIVORES; WETLAND VEGETATION; SHOOT DEMOGRAPHY; GROWTH-RESPONSES; COASTAL MARSH; DYNAMICS; COMPETITION;
Keywords:
Canada goose; Carex ramenskii; herbivory; Plantago maritima; Potentilla egedii; snow goose; Triglochin maritimum;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Zacheis, A Univ Alaska, Dept Biol & Wildlife, 211 Irving, Fairbanks, AK 99775 USA Univ Alaska 211 Irving Fairbanks AK USA 99775 nks, AK 99775 USA
Citazione:
A. Zacheis et al., "Effects of migratory geese on plant communities of an Alaskan salt marsh", J ECOLOGY, 89(1), 2001, pp. 57-71

Abstract

1 We studied the effects of lesser snow geese (Anser caerulescens caerulescens) and Canada geese (Branta canadensis) on two salt marsh plant communities in Cook Inlet, Alaska, a stopover area used during spring migration. From 1995 to 1997 we compared plant species composition and biomass on plots where geese were excluded from feeding with paired plots where foraging could occur.2 Foraging intensity was low (650-1930 goose-days km(-2)) compared to other goose-grazing systems.3 Canada geese fed mainly on above-ground shoots of Triglochin maritimum, Purcinella spp. and Cares ramenskii, whereas the majority of the snow goosediet consisted of below-ground tissues of Plantago maritima and Triglochinmaritimum.4 Plant communities responded differently to goose herbivory. In the sedgemeadow community, where feeding was primarily on above-ground shoots, there was no effect of grazing on the dominant species Carex ramenskii and Triglochin maritimum. In the herb meadow community, where snow geese fed on Plantago maritima roots and other below-ground tissues, there was a differencein the relative abundance of plant species between treatments. Biomass of Plantago maritima and Potentilla egedii was lower on grazed plots compared with exclosed, whereas biomass of Carex ramenskii was greater on grazed plots. There was no effect of herbivory on total standing crop biomass in either community. The variable effect of herbivory on Carer ramenskii between communities suggests that plant neighbours and competitive interactions are important factors in a species' response to herbivory. In addition, the type of herbivory (above- or below-ground) was important in determining plant community response to herbivory.5 Litter accumulation was reduced in grazed areas compared with exclosed in both communities. Trampling of the previous year's litter into the soil surface by geese incorporated more litter into soils in grazed areas.6 This study illustrates that even light herbivore pressure can alter plant communities and affect forage availability.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/08/20 alle ore 12:50:46