Trophic ecology of two syntopic sciaenid species (Micropogonias furnieri (Desmarest, 1823) and Ctenosciaena gracilicirrhus ) (Metzelaar, 1919) in a tropical bay in south-eastern Brazil

2017 ◽  
Vol 33 (4) ◽  
pp. 740-745 ◽  
Author(s):  
M. M. Martins ◽  
H. S. Mendonça ◽  
S. S. Rodrigues ◽  
F. G. Araújo
Keyword(s):  
Trophic Ecology ◽  
South Eastern ◽  
Eastern Brazil ◽  
Micropogonias Furnieri ◽  
Tropical Bay

scholarly journals Record of a bypass on the oral siphon of Ascidia sydneiensis (Tunicata: Ascidiacea) in a tropical bay from south-eastern Brazil

2020 ◽  
Vol 68 ◽  
Author(s):  
Paulo Cezar Azevedo Silva ◽  
Géssica Cristine Maia Oliveira ◽  
Danielle Fernandes Barboza ◽  
Luís Felipe Skinner
Keyword(s):  
South Eastern ◽  
Eastern Brazil ◽  
Tropical Bay

Sex ratio and sexual dimorphism of the anchovy Anchoa januaria (Actinopterygii, Engraulidae) in a tropical bay in south-eastern Brazil

2007 ◽  
Vol 71 (3) ◽  
pp. 877-888 ◽  
Author(s):  
J. N. S. Santos ◽  
F. G. Araújo ◽  
M. A. Silva ◽  
R. M. Vasconcellos
Keyword(s):  
Sexual Dimorphism ◽  
Sex Ratio ◽  
South Eastern ◽  
Eastern Brazil ◽  
Tropical Bay

Trophic ecology and foraging areas of cetaceans sampled in the coastal waters of south-eastern Brazil assessed through skin δ13C and δ15N

2021 ◽  
pp. 1-10
Author(s):  
Victor Uber Paschoalini ◽  
Genyffer Cibele Troina ◽  
Laura Busin Campos ◽  
Marcos César de Oliveira Santos
Keyword(s):  
Habitat Use ◽  
Coastal Waters ◽  
Trophic Ecology ◽  
Trophic Position ◽  
Trophic Levels ◽  
Eastern Coast ◽  
Cetacean Species ◽  
Δ13c And Δ15n ◽  
South Eastern ◽  
Eastern Brazil

Abstract We investigated the habitat use and feeding ecology of 10 cetacean species encountered along the south-eastern coast of Brazil (24–26°S) using carbon (δ13C) and nitrogen (δ15N) stable isotopes. Hierarchical cluster analysis distinguished two main groups based on their isotopic patterns. One group included migratory baleen whales (Megaptera novaeangliae and Eubalaena australis) with the lowest δ13C and δ15N values, reflecting baseline isotopic values of their Subantarctic feeding grounds and consumption of lower trophic level prey. Resident species and those occasionally occurring in Brazilian coastal waters highly differed from the migratory whales in their isotopic values. In this group, Tursiops truncatus had the highest δ13C and δ15N values, indicating coastal habits and relatively higher trophic position. Similar δ13C values were observed in Sotalia guianensis, Pontoporia blainvillei, Orcinus orca and Steno bredanensis. However, the former two species had lower δ15N values than the latter two, indicating different trophic positions. The relatively lower δ13C values observed in Stenella frontalis suggest greater influence of pelagic prey in their diet. Furthermore, the lower δ13C values observed in Delphinus delphis and Balaenoptera edeni were associated with upwelling events that occur along the region, affecting the isotopic values of their main prey. Juvenile M. novaeangliae had higher δ13C and δ15N than the adults, which may indicate feeding in areas with different isoscapes and consumption of pelagic schooling fish with relatively higher trophic levels than krill. This study provides preliminary information that are useful to understand the habitat use and coexistence of cetacean species occurring in south-eastern Brazil.

Diet of the amphi-Atlantic scaphopod Fissidentalium candidum in the deep waters of Campos Basin, south-eastern Brazil

2016 ◽  
Vol 97 (6) ◽  
pp. 1259-1266
Author(s):  
Renato Junqueira De Souza Dantas ◽  
Lazaro Luiz Mattos Laut ◽  
Carlos Henrique Soares Caetano
Keyword(s):  
Trophic Ecology ◽  
Inorganic Material ◽  
Dietary Diversity ◽  
Feeding Habits ◽  
High Rate ◽  
South Eastern ◽  
Deep Waters ◽  
Campos Basin ◽  
Eastern Brazil ◽  
Polymetallic Nodules

Specimens of Fissidentalium candidum collected at Campos Basin, south-eastern Brazil, had their diet investigated in order to assess its feeding habits. Benthic prey exceeded the planktonic ones as expected and Foraminifera constituted the most frequent prey taxa, comprising about 99.5% of the scaphopod diet; the remaining components included a few molluscs (gastropods, bivalves and scaphopods), a nematode, an ostracod crustacean, fish otoliths, unknown partial organisms and inorganic material (e.g. sediment grains and polymetallic nodules). Amongst the species previously studied, F. candidum stood out by presenting the highest dietary diversity (H = 3.35) and species richness (N = 118). Predator and prey dimensions were not correlated and no spatial variation was observed in the diet amongst the three collection sites in the mid-slope of Campos Basin. Generalism, high rate of rare or unimportant species and high contribution of within-phenotype component to the niche width were important features of the trophic ecology of F. candidum. Inhabiting the deep water of Campos Basin, this dentaliid obtained most of its energy from the benthic microfauna, being a specialized foram predator with moderate preference for, and moderate selection against, several species.

The trophic ecology of marine catfishes in south-eastern Brazil

2020 ◽  
Vol 100 (1) ◽  
pp. 133-142
Author(s):  
Pedro V. Gatts ◽  
Marcos A. L. Franco ◽  
Marcelo G. Almeida ◽  
Ilana R. Zalmon ◽  
Ana Paula M. Di Beneditto ◽  
...  
Keyword(s):  
Total Mass ◽  
Total Mercury ◽  
Trophic Ecology ◽  
Niche Overlap ◽  
Mercury Content ◽  
Isotopic Niche ◽  
South Eastern ◽  
Eastern Brazil ◽  
Janeiro State ◽  
Prey Items

AbstractThe stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) and total mercury concentrations (THg) of the three marine catfish species Aspistor luniscutis, Bagre bagre and Genidens genidens were evaluated to understand their trophic relationship in northern Rio de Janeiro state, south-eastern Brazil. The δ13C was similar among the three marine catfishes, whereas δ15N was similar in A. luniscutis and B. bagre and lower in G. genidens. THg was higher in G. genidens and lower in B. bagre. The greater assimilation of Sciaenidae fishes and squids by A. luniscutis and B. bagre resulted in smaller isotopic niche areas and trophic diversity but higher isotopic niche overlap, trophic redundancy and evenness. For G. genidens, the similar assimilation of all prey items resulted in the broadest isotopic niche among the marine catfishes. The higher mercury content in G. genidens is consistent with an increased important contribution of prey with a higher Hg burden. The bioaccumulation process was indicated by significant correlations of δ15N and THg with total length and total mass. Additionally, a significant correlation between THg and δ15N reflected the biomagnification process through the food web.

scholarly journals A new species ofEugenia(Myrtaceae) from south-eastern Brazil

2008 ◽  
Vol 158 (2) ◽  
pp. 306-308
Author(s):  
MARCELO DA COSTA SOUZA ◽  
MARLI PIRES MORIM
Keyword(s):  
New Species ◽  
South Eastern ◽  
Eastern Brazil ◽  
A New Species

scholarly journals Regionally extinct species rediscovered: the bush dog Speothos venaticus in Minas Gerais, south-eastern Brazil

Oryx ◽  
2014 ◽  
Vol 49 (1) ◽  
pp. 60-63 ◽  
Author(s):  
Guilherme Braga Ferreira ◽  
Marcelo Juliano Rabelo Oliveira ◽  
Rogério Cunha de Paula ◽  
Flávio Henrique Guimarães Rodrigues ◽  
Érica Daniele Cunha Carmo
Keyword(s):  
Protected Areas ◽  
Minas Gerais ◽  
The State ◽  
South American ◽  
North West ◽  
South Eastern ◽  
The North ◽  
Eastern Brazil ◽  
Bush Dog ◽  
Speothos Venaticus

AbstractThe bush dog Speothos venaticus, a rare Near Threatened South American canid that lives in packs, was thought to be extinct in Minas Gerais state, south-eastern Brazil, until recently. Here, we report four recent records of the species in Minas Gerais, the first in the state since the description of the species in 1842. All records are from the Cerrado ecosystem in the north and north-west of the state; two are from animals found dead, one from footprints and another from a camera trap. Three of the records were inside or close (< 10 km) to strict protected areas, in a region recognized as the Protected Areas Mosaic Sertão Veredas–Peruaçu, where we expect any new records of the bush dog to be found. We discuss the low probability of detecting the bush dog and the main regional threats to the species, and emphasize the need to protect large and interconnected natural areas and keep them free of domestic dogs to avoid the extinction of the bush dog in Minas Gerais.

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