The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia

The study demonstrated that the protozooplankton community of the Ilha Solteira reservoir experienced seasonal variation in relation to the density and composition of species

Despite the lower richness and abundance of snakes in the Estação Ecológica de Santa Bárbara and region (21 species, N = 56), the composition of species was

Altitude was the main determinant of local fish species richness and composition, and a discontinuity in assemblage organization (richness, composition, fish size) was detected

Thus the study presents the composition of the benthic fauna, seasonal variation in the assemblage of benthic macroinvertebrates and its relationship with depth and content

In view of the availability of databases with a growing number of observations and the diversity of sampling densities reported in studies, the purpose of this study was to evaluate

Two ichthyoplankton surveys were conducted during July 1994 and July 1995 in the Gulf of Cádiz with the aim of describing composition, abundance, distribution patterns and

The number of characiform species (water column species) and the number of siluriform species (benthic species) were chosen as indicators of the habitat

The aims of this study were as follows: (a) describe the vertical variation in copepod density and assemblage structure (composition, richness, and diversity) down to 1,200 m over