scholarly journals Spatial variation of five co-existing siluriformes in an atlantic rain forest drainage

2009 ◽  
Vol 52 (1) ◽  
pp. 127-133
Author(s):  
Rosana Mazzoni ◽  
Fernanda de Souza Lemos ◽  
Ricardo Iglesias-Rios
Keyword(s):  
Correlation Analysis ◽  
Species Composition ◽  
Rain Forest ◽  
Atlantic Rain Forest ◽  
Sampling Occasion ◽  
Simple Correlation ◽  
Parameters Analysis ◽  
Hydrological Parameter ◽  
Forest Drainage ◽  
Habitat Parameters

Five species of Siluriformes were registered in the Ubatiba system. Pimelodella lateristriga was the dominant one, followed by Hypostomus gr. punctatus, Rineloricaria sp., Callichthys callichthys and Rhamdia sp. Simple correlation analysis between species density and habitat parameters indicated that hydrology explained density patterns of four species. Pimelodella densities were negatively correlated with pools, Callichthys and Hypostomus densities were positively correlated with runs and Rhamdia densities were positively correlated with riffles; Rineloricaria densities did not respond to any hydrological parameter. Substrata were an important factor to all species, but specific preferences were observed. Marginal vegetation was positively correlated only to Pimelodella densities. Sorensen dissimilarity analysis indicated that site groups, based on both species composition and habitat parameters, were very similar and corroborated the correlation analysis suggesting that Siluriformes composition should be explained by many habitat parameters. Analysis of co-variation of species densities at each sampling occasion showed to be statistically similar in at least all (100%) analysed cases indicating that Siluriformes composition was strongly persistent in time.

scholarly journals Stream-dwelling fish communities from an Atlantic rain forest drainage

2006 ◽  
Vol 49 (2) ◽  
pp. 249-256 ◽  
Author(s):  
Rosana Mazzoni ◽  
Nelsy Fenerich-Verani ◽  
Érica Pellegrini Caramaschi ◽  
Ricardo Iglesias-Rios
Keyword(s):  
Rain Forest ◽  
Environmental Variables ◽  
Great Part ◽  
Distribution Patterns ◽  
The Other ◽  
River Continuum Concept ◽  
Atlantic Rain Forest ◽  
River Continuum ◽  
Continuum Concept ◽  
Forest Drainage

Twenty-two species were registered in the Ubatiba system with a predominance of Characiformes and Siluriformes followed by Cyprinodontiformes, Perciformes and Synbranchiformes. Among these species four were occasional with one or two sampled individuals and restricted to one or two of the nine studied sites; the other 18 species were constant with high densities in at least one site. Most of the sampled sites presented between 11 and 18 species, all largely distributed; except for the uppermost site, located right over a waterfall 4m high, which showed at least four species and for the confluence site that presented 18 species. Canonical Correspondence Analysis indicated that environmental variables explained a great part of the density and distribution patterns of the fish species, showing that community structure of each locality was independent from the longitudinal succession, theoretically expected by the River Continuum Concept, and hardly explained by local environmental characteristics.

scholarly journals Environmental factors affecting the distribution of land snails in the Atlantic Rain Forest of Ilha Grande, Angra dos Reis, RJ, Brazil

2012 ◽  
Vol 72 (1) ◽  
pp. 79-86 ◽  
Author(s):  
GKM Nunes ◽  
SB Santos
Keyword(s):  
Environmental Factors ◽  
Species Composition ◽  
Rain Forest ◽  
Pearson Correlation ◽  
Land Snail ◽  
Land Snails ◽  
Environmental Data ◽  
Compositional Variation ◽  
Snail Species ◽  
Atlantic Rain Forest

The distribution and abundance of terrestrial molluscs are affected by environmental factors, but data are lacking for Brazilian land snails. The aim of this study was to understand the relationship between measured environmental factors and the land-snail species composition of two hillsides covered with Atlantic Rain Forest on Ilha Grande. On each hillside, five plots located at 100 m intervals between 100 to 500 m asl were chosen. Each plot was sampled by carrying out timed searches and collecting and sorting litter samples from ten quadrats of 25 × 75 cm. A range of environmental data was measured for each of the quadrats in a plot. A Cluster Analysis was carried out for the richness and abundance data. The environmental variables were analysed using a Pearson Correlation Matrix and Discriminant Analysis. Our results show that the two mountains are similar in species richness, but species composition and abundance are different, probably reflecting observed differences in environmental conditions. The environmental factors associated with compositional variation between the two mountains were: atmospheric temperature, soil temperature, litter depth, and relative air humidity. Distinct luminosity and canopy closure conditions were related to the composition of the land-snail community of one hillside.

Chemical and biological evaluation of native bamboo species from atlantic rain forest

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
MT Grombone-Guaratini ◽  
LM Brandão Torres ◽  
DA Faria ◽  
CM José
Keyword(s):  
Rain Forest ◽  
Biological Evaluation ◽  
Atlantic Rain Forest ◽  
Bamboo Species

Ecological processes maintaining differential tree species distributions in an Australian subtropical rain forest: implications for models of species coexistence

2000 ◽  
Vol 16 (3) ◽  
pp. 387-415 ◽  
Author(s):  
Igor Debski ◽  
David F. R. P. Burslem ◽  
David Lamb
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Rain Forest ◽  
Large Scale ◽  
Species Coexistence ◽  
Common Species ◽  
Size Class ◽  
Differential Mortality ◽  
Mixed Composition ◽  
Large Scale Disturbance

All stems ≥ 1 cm dbh were measured, tagged, mapped and identified on a 1-ha plot of rain forest at Gambubal State Forest, south-east Queensland, Australia. The spatial patterns and size class distributions of 11 common tree species on the plot were assessed to search for mechanisms determining their distribution and abundance. The forest was species-poor in comparison to many lowland tropical forests and the common species are therefore present at relatively high densities. Despite this, only limited evidence was found for the operation of density-dependent processes at Gambubal. Daphnandra micrantha saplings were clumped towards randomly spaced adults, indicating a shift of distribution over time caused by differential mortality of saplings in these adult associated clumps. Ordination of the species composition in 25-m × 25-m subplots revealed vegetation gradients at that scale, which corresponded to slope across the plot. Adult basal area was dominated by a few large individuals of Sloanea woollsii but the comparative size class distributions and replacement probabilities of the 11 common species suggest that the forest will undergo a transition to a more mixed composition if current conditions persist. The current cohort of large S. woollsii individuals probably established after a large-scale disturbance event and the forest has not attained an equilibrium species composition.

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