Luiz O.J.,Macquarie University |
Mendes T.C.,Federal University of Fluminense |
Barneche D.R.,Macquarie University |
Ferreira C.G.W.,Institute Estudos Do Mar Almirante Paulo Moreira |
And 5 more authors.
Marine and Freshwater Research | Year: 2015
This study investigates the reef fish community structure of the world's smallest remote tropical island, the St Peter and St Paul's Archipelago, in the equatorial Atlantic. The interplay between isolation, high endemism and low species richness makes the St Peter and St Paul's Archipelago ecologically simpler than larger and highly connected shelf reef systems, making it an important natural laboratory for ecology and biogeography, particularly with respect to the effects of abiotic and biotic factors, and the functional organisation of such a depauperate community. Boosted regression trees were used to associate density, biomass and diversity of reef fishes with six abiotic and biotic variables, considering the community both as a whole and segregated into seven trophic groups. Depth was the most important explanatory variable across all models, although the direction of its effect varied with the type of response variable. Fish density peaked at intermediate depths, whereas biomass and biodiversity were respectively positively and negatively correlated with depth. Topographic complexity and wave exposure were less important in explaining variance within the fish community than depth. No effects of the predictor biotic variables were detected. Finally, we notice that most functional groups are represented by very few species, highlighting potential vulnerability to disturbances. © CSIRO 2015.
Lodi L.,Instituto Mar Adentro |
Tardin R.H.,Instituto Mar Adentro |
Tardin R.H.,Federal Rural University of Rio de Janeiro |
Hetzel B.,Instituto Mar Adentro |
And 4 more authors.
Zoologia | Year: 2015
Bryde’s whales, Balaenoptera edeni Anderson, 1879, were observed on 17 occasions (N = 21 surveys) in the coastal waters off Rio de Janeiro in southeastern Brazil during austral summer through autumn 2014. Five whales were individually identified using photo-identification techniques. The mean interval between resightings for all individuals was 12.8 days, with a minimum of one day and a maximum of 48 days. The comparison between the catalogs of Bryde’s whales off Rio de Janeiro and the Cabo Frio region revealed matches for three individuals. The resightings show movements of up to 149.6 km along the coastal waters off the state of Rio de Janeiro. Most of the observations consisted of solitary individuals (82.3% of sightings). Feeding was the predominant behavior observed (47%), followed by milling (35.3%) and travelling (17.6%) in waters up to 48 m deep. Direct observations resulted in the addition of new prey, such as snubnose anchovy, Anchoviella brevirostris (Günther, 1868) and white snake mackerel, Thyrsitops lepidopoides (Cuvier, 1832), to the known diet of the Bryde’s whale. A long time series of photo-identification efforts in the Rio de Janeiro, the Cabo Frio region and other areas can elucidate fundamental aspects of spatial and temporal site fidelity knowledge of Bryde’s whales in southeastern Brazil. © 2015 Sociedade Brasileira de Zoologia. All rights reserved.
Bovini M.G.,Institute Pesquisas Jardim Botanico Do Rio Of Janeiro |
Faria M.,Instituto Mar Adentro |
Oliveira R.R.,Pontifical Catholic University of Rio de Janeiro |
Kurtz B.C.,Institute Pesquisas Jardim Botanico Do Rio Of Janeiro
Check List | Year: 2014
The vascular flora was inventoried of the Cagarras Islands Natural Monument (CINM) located offshore of Rio de Janeiro, Brazil, and a total of 171 species were encountered. The families with the greatest richnesses were: Asteraceae (12 spp.), Myrtaceae (12), Fabaceae (11), Bromeliaceae (7), Cactaceae (6), Euphorbiaceae (6), and Poaceae (6). The regional vegetation was similar to restinga, although high concentrations of guano from nesting marine birds affected diversity on two islands. The threatened species Gymanthes nervosa Müll. Arg. was recorded from the municipality of Rio de Janeiro for the first time since the 1940s. © 2014 Check List and Authors.