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Life-form spectra of quartzite and itabirite rocky outcrop sites, Minas Gerais, Brazil Biota Neotropica
Messias,Maria Cristina Teixeira Braga; Leite,Mariangela Garcia Praça; Meira-Neto,João Augusto Alves; Kozovits,Alessandra Rodrigues.
Vascular species and their respective life-forms and coverage were recorded in a Brazilian quartzite and itabirite rocky outcrop site at Serra de Ouro Preto, producing the floristic, frequency and vegetational spectra. Three habitats in both lithologies were defined by geomorphology as: 1) Sloped areas near the mountain summit, with grasslands; 2) Plateaus in the middle of the slope, with grasslands; and 3) Lower and/or concave parts of the slopes, with woody savannas. The life-forms followed Raunkiaer's System. We aimed to answer the following questions: Do quartzite and itabirite rocky outcrops have different biological spectra? Are the biological spectra different in the geomorphologic habitats? Do the floristic, vegetational and frequency spectra...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological spectrum; Ferruginous rocky outcrops; Quadrilátero Ferrífero; Raunkiaer.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000200026
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Life-forms, pollination and seed dispersal syndromes in plant communities on ironstone outcrops, SE Brazil Acta Botanica
Jacobi,Claudia Maria; Carmo,Flávio Fonseca do.
Rock outcrops play an important role in enhancing plant diversity in montane ecosystems. Ironstone outcrops (cangas) are among the lithotypes less known and most threatened in SE Brazil, due to mining activities. Besides species composition, a key feature to promote their conservation and restoration is the knowledge of the community prevalent life-forms, pollination and seed dispersal syndromes. The analyses were done based on published floristic surveys of cangas in SE Brazil. A total of 353 species of angiosperms (70 families) were assigned to one of the two predominant physiognomies (open areas and forest islands) on ironstone outcrops. Sixteen families responded for 70% of all species. Compared to Raunkiaer's spectrum, phanerophytes were over- and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological spectrum; Cangas; Conservation; Geoedaphic conditions; Rock outcrops.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000200016
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