Data/hora: 24/06/2024 11:19:30

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 03/07/1997
Data da última atualização: | 31/03/2017
Autoria: | ARCHER, S.; GARRETT, M. G.; DETLING, J. K.
Título: | Rates of vegetation change associated with prairie dog (Cynomys ludovicianus) grazing in North American mixed-grass prairie.
Ano de publicação: | 1987
Fonte/Imprenta: | Vegetatio, v.72, n.3, p.159-166, 1987.
Idioma: | Inglês
Conteúdo: | A prairie dog (Cynomys ludovicianus) colony with a known history of habitation was studied to quantify the effects of herbivory on plants species composition, dominance, stature and diversity in a North American mixedgrass prairie. Gradient analysis was used to quantify the relationship between plant community structure, prairie dog density, burrow density and habitation history and to document community-level response of plants subjected to heavy grazing pressure. The results quantify the type, rate and extent of change which plant populations and communities may undergo in response to the differential grazing of plants variously tolerant of defoliation. Detrended correspondence analysis indicated that 69% of the between-sample floristic variance on the site was attributable to prairie dog habitation. Perennial grasses were rapidly displanced from the site within 3 yr of colonization and were replaced by annual forbs. The net result was an increase in species richness and diversity on the prairie dog colony. Within the colony, however, the number of species was more a function of stand size than colonization history. Significant decreases in canopy stature after 2 yr of habitation resulkted from replacement of mid-height grass species by shortgrass species and forbs. In addition, there was a shift from tall growth forms of off-colony species to dwarf growth forms of the same species on the colony. Decreases in litter and increases in bare soil cover were substatial during the first 2 yr of habitation but changed little thereafter.
Palavras-Chave: | Buchloe; Diversidade; Diversity; Estrutura; Herbivoro; Herbivory; Structure.
Thesaurus Nal: | Agropyron; Bouteloua; Cynomys ludovicianus; Stipa.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (34495-1) - ADC - SP - PP - SP15247 -  - 15247 - DIS