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dc.contributor.authorNagy, R. Chelsea  Concept link
dc.contributor.authorPorder, Stephen  Concept link
dc.contributor.authorNeill, Christopher  Concept link
dc.contributor.authorBrando, Paulo  Concept link
dc.contributor.authorQuintino, Raimundo Mota  Concept link
dc.contributor.authordo Nascimento, Sebastiao Aviz  Concept link
dc.date.accessioned2015-09-29T17:44:04Z
dc.date.available2015-09-29T17:44:04Z
dc.date.issued2015-09
dc.identifier.citationEcological Applications 25 (2015): 1725-1838en_US
dc.identifier.urihttps://hdl.handle.net/1912/7549
dc.descriptionAuthor Posting. © Ecological Society of America, 2015. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 25 (2015): 1725-1838, doi:10.1890/14-1740.1.en_US
dc.description.abstractDeforestation and fragmentation influence the microclimate, vegetation structure, and composition of remaining patches of tropical forest. In the southern Amazon, at the frontier of cropland expansion, forests are converted and fragmented in a pattern that leaves standing riparian forests whose dimensions are mandated by the Brazilian National Forest Code. These altered riparian forests share many characteristics of well-studied upland forest fragments, but differ because they remain connected to larger areas of forest downstream, and because they may experience wetter soil conditions because reduction of forest cover in the surrounding watershed raises groundwater levels and increases stream runoff. We compared forest regeneration, structure, composition, and diversity in four areas of intact riparian forest and four areas each of narrow, medium, and wide altered riparian forests that have been surrounded by agriculture since the early 1980s. We found that seedling abundance was reduced by as much as 64% and sapling abundance was reduced by as much as 67% in altered compared to intact riparian forests. The most pronounced differences between altered and intact forest occurred near forest edges and within the narrowest sections of altered riparian forests. Woody plant species composition differed and diversity was reduced in altered forests compared to intact riparian forests. However, despite being fragmented for several decades, large woody plant biomass and carbon storage, the number of live or dead large woody plants, mortality rates, and the size distribution of woody plants did not differ significantly between altered and intact riparian forests. Thus, even in these relatively narrow forests with high edge : area ratios, we saw no evidence of the increases in mortality and declines in biomass that have been found in other tropical forest fragment studies. However, because of the changes in both species community and reduced regeneration, it is unclear how long this relative lack of change will be sustained. Additionally, Brazil recently passed a law in their National Forest Code allowing narrower riparian buffers than those studied here in restored areas, which could affect their long-term sustainability.en_US
dc.description.sponsorshipThis research has been supported by a grant from the U.S. Environmental Protection Agency's Science to Achieve Results (STAR) program (Award #: FP-91749001-0). Additional support was provided by NSF Award # DEB 0949370 and the São Paulo Research Foundation (FAPESP).en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherEcological Society of Americaen_US
dc.relation.hasparthttps://doi.org/10.1890/14-1740.1.sm
dc.relation.hasparthttps://doi.org/10.5061/dryad.418b0
dc.relation.urihttps://doi.org/10.1890/14-1740.1
dc.subjectAgricultureen_US
dc.subjectAmazonen_US
dc.subjectBrazilen_US
dc.subjectCompositionen_US
dc.subjectDiversityen_US
dc.subjectForest structureen_US
dc.subjectFragmentationen_US
dc.subjectRiparian ecosystemsen_US
dc.titleStructure and composition of altered riparian forests in an agricultural Amazonian landscapeen_US
dc.typeArticleen_US
dc.identifier.doi10.1890/14-1740.1


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