Abstract
This study aimed to evaluate aquatic-macrophyte richness, life forms and floristic composition along the longitudinal axis of Sobradinho Reservoir - Bahia. Six sampling stations were selected along the lotic, transition and lentic stretches. Sampling was conducted in June and July 2008 (drought season), and in January and February 2009 (rainy season). Individuals in both fertile and vegetative stages were sampled and the species were classified according to life form and occurrence frequency. Floristic similarity among sampling stations was expressed by the Jaccard index. Forty-three species were recorded, 21 of these being present in the lotic stretch, 21 in the transition stretch and 30 in the lentic stretch. Salvinia auriculata Aubl. and Paspalum repens P.J. Bergius occurred in 100% of the sampling units. The lotic and transition regions were predominantly colonized by emergent and amphibious macrophytes, whereas the lentic region was colonized by plants with floating and submersed habits. The analysis showed a high similarity (> 50%) between lotic and transition stretches, and low similarity (< 25%) between these and the lentic stretch.
Key-words:
floristics; habit; reservoirs; similarity