Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/241880
Type: Artigo de periódico
Title: Early Recruitment Responses To Interactions Between Frequent Fires, Nutrients, And Herbivory In The Southern Amazon
Author: Massad
Tara Joy; Balch
Jennifer K.; Mews
Candida Lahis; Porto
Pabio; Marimon Junior
Ben Hur; Quintino
Raimundo Mota; Brando
P. M.; Vieira
Simone A.; Trumbore
Susan E.
Abstract: Understanding tropical forest diversity is a long-standing challenge in ecology. With global change, it has become increasingly important to understand how anthropogenic and natural factors interact to determine diversity. Anthropogenic increases in fire frequency are among the global change variables affecting forest diversity and functioning, and seasonally dry forest of the southern Amazon is among the ecosystems most affected by such pressures. Studying how fire will impact forests in this region is therefore important for understanding ecosystem functioning and for designing effective conservation action. We report the results of an experiment in which we manipulated fire, nutrient availability, and herbivory. We measured the effects of these interacting factors on the regenerative capacity of the ecotone between humid Amazon forest and Brazilian savanna. Regeneration density, diversity, and community composition were severely altered by fire. Additions of P and N + P reduced losses of density and richness in the first year post-fire. Herbivory was most important just after germination. Diversity was positively correlated with herbivory in unburned forest, likely because fire reduced the number of reproductive individuals. This contrasts with earlier results from the same study system in which herbivory was related to increased diversity after fire. We documented a significant effect of fire frequency; diversity in triennially burned forest was more similar to that in unburned than in annually burned forest, and the community composition of triennially burned forest was intermediate between unburned and annually burned areas. Preventing frequent fires will therefore help reduce losses in diversity in the southern Amazon's matrix of human-altered landscapes.
Subject: Rain-forest
Tropical Forests
Tree Diversity
Species Composition
Brazilian Amazon
Natural Enemies
Plant Diversity
Global Change
Community
Biomass
Country: NEW YORK
Editor: SPRINGER
Rights: fechado
Identifier DOI: 10.1007/s00442-015-3259-9
Address: http://link.springer.com/article/10.1007%2Fs00442-015-3259-9
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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