期刊
JOURNAL OF BRYOLOGY
卷 32, 期 -, 页码 101-112出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/037366810X12578498136110
关键词
conservation; ecological guild; edge effect; hemispherical photographs; leaf area index; tropical rainforest
资金
- Fundacao O Boticario de Protecao A Natureza ('O Boticario Foundation for Environmental Protection)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - CNPq (National Board for Scientific and Technological Development)
The species richness and diversity of epiphytic and epiphyllous bryophytes were investigated along an edge-interior gradient in a large Atlantic Forest remnant in Northeast Brazil. Bryophyte samples were collected at 60 geographically randomised points, which were distributed among five zones located at different distances in from the forest edge. In each site the altitude was recorded and a hemispherical photograph was taken to determine the degree of canopy opening and light transmittance. There was no statistically significant variation of species-richness and diversity in relation to the forest edge, even at 1084 m from the edge. Instead, among the microenvironment variables studied, only altitude supported the most diverse bryophyte floras, especially epiphyllous and shade-tolerant species that are sensitive to disturbance. Besides this, the degree of canopy cover was also relevant, albeit with less significance. These results show that bryophytes respond better to scattered and unique conditions, within moderate microclimates, in the remnant itself than they do to the edge-interior gradient distances alone.
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