Do the seasonal forests in northeastern Brazil represent a single floristic unit?

Brazilian Journal of Biology

Mjn. Rodal²  Mrv. Barbosa¹  Ww. Thomas¹ 

[1] ,Universidade Federal Rural de Pernambuco Departamento de Biologia Recife PE ,Brazil

关键词: diversity;    tropical dry forest;    caatinga;    Atlantic coastal forest;    diversidade;    floresta tropical seca;    caatinga;    Floresta Atlântica costeira;   

DOI  :  10.1590/S1519-69842008000300003

来源: SciELO

【 摘 要 】

Floristic analyses (Principal Component Analysis and Analysis of Group Indicators) at the genus level were employed to characterize and compare seasonal forest formations in northeastern Brazil. The presence - absence of 248 genera of woody plants occurring in 24 floristic surveys was correlated with geomorphology and climatic variables. The analyses were consistent and point to the existence of two floristic groups of seasonal forests in the region, one more closely related to the Atlantic Coastal Forest (mata atlântica) and the other to the xerophytic formations (caatinga) of the region. The driest seasonal forest group experiences more than 8 dry months per year and/or a total annual rainfall of <1000 mm, and is found on the ancient eroded peaks in the semi-arid core and on the western slopes of the Borborema Plateau.

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