20 documents found, page 1 of 2
Structure, growth and CaCO3 production in a shallow rhodolith bed from a highly...
Carneiro, Pedro Bastos de Macêdo; Lima, Jadson Pinto de; Bandeira, Ênio Victor Paiva; Ximenes Neto, Antônio RodriguesRhodolith growth and CaCO3 production remain poorly quantified along the SW Atlantic Ocean, and it is difficult to relate the available measurements with biomass estimates. Suboptimal conditions may clarify how harsh environments influence nodule growth and abundance, elucidating their relationship. Off the energetic South American equatorial coast a rhodolith bed (~65 km2), formed mainly by Mesophyllum sp. and...
Molecular evidences confirm the taxonomic separation of two sympatric congeneri...
Barroso, Cristiane Xerez; Freitas, João Eduardo Pereira de; Cascon, Helena Matthews; Bezerra, Luis Ernesto Arruda; Lotufo, Tito Monteiro da CruzA reliable taxonomy, together with more accurate knowledge of the geographical distribution of species, is a fundamental element for the study of biodiversity. Multiple studies on the gastropod family Neritidae record three species of the genus Neritina in the Brazilian Province: Neritina zebra (Bruguière, 1792), Neritina virginea (Linnaeus, 1758), and Neritina meleagris Lamarck, 1822. While N. zebra has a well...
Oil spill in South Atlantic (Brazil): Environmental and governmental disaster
Soares, Marcelo de Oliveira; Teixeira, Carlos Eduardo Peres; Bezerra, Luís Ernesto Arruda; Paiva, Sandra Vieira; Tavares, Tallita Cruz LopesIn early September 2019, dense crude oil began to wash the beaches of Brazil's tropical coast. Four months after the first report, the oil has already been found along >3000 km of the Brazilian coastline on >980 beaches and was recently observed along the Amazon coast, making this oil spill the most extensive and severe environmental disaster ever recorded in Brazilian history, in the South Atlantic basin, and ...
Aboveground carbon stock in a restored neotropical mangrove: influence of manag...
Ferreira, Alexander C.; Bezerra, Luis Ernesto Arruda; Cascon, Helena MatthewsMangrove forests are important sinks of atmospheric carbon, and the internal deposits and fluxes of organic matter can reflect how these ecosystems respond to disturbances and environmental changes. Data on carbon content of mangrove forests vary geographically due to differences in abiotic (climate, geomorphic settings, tides) and biotic (diversity, herbivory, bioturbation) conditions. Mangroves have been degr...
Marine benthic communities affected by the Doce River (southwestern Atlantic): ...
Cascon, Helena Matthews; Bezerra, Luís Ernesto Arruda; Barroso, Cristiane Xerez; Rabay, Soraya Guimarães; Moreira, Ana karla; Rocha, Valesca PaulaPrior to Brazil's worst environmental disaster, caused by a mining dam collapse, we had carried out a study of the marine benthic macrofauna (11–51 m depth) under the influence of the Doce River. Our results showed significant diversity, in which mollusks, polychaetes, and crustaceans had the highest frequency, density, and abundance, represented by 162 families in summer and 173 in winter. Our results suggeste...
Determinação do indicador de estabilização da forma da concha (IEF) de Anomaloc...
Marinho, Reynaldo Amorim; Maia, Luzanira Colares; Conceição, Raimundo Nonato de Lima; Cascon, Helena MatthewsMany species of bivalves found in intertidal areas are edible and have been largely collected in several regions of Brazil. These species inhabit areas of easy access to people, in the regions of tide range by the seaside or in rock shorelines. In the Brazilian coast, various species of bivalve mollusks of estuary regions are extracted in rudimentary manner by the traditional communities, without methods of han...
Annellida, Hirudinea, Piscicolidae, Stibarobdella macrothela (Schmarda, 1861): ...
Alves, Jessika O. P.; Monteiro, Felipe A. C.; Cascon, Helena Matthews; Cascon, PauloThis is the first report of Stibarobdella macrothela, a parasitic marine leech, for Ceará (Northeastern Brazil), the second report for Brazil, and the first report for the genus Stibarobdella in Northeastern Brazil. Two specimens separated from the host shark Carcharhinus sp. were identified in the invertebrate collection at LIMCe (Laboratório de Invertebrados Marinhos do Ceará, Universidade Federal do Ceará). ...
Pugilina morio L., a New Imposex Exhibitor from South American Estuarine Enviro...
Azevedo, Deyse de; Barreira, Cristina de Almeida Rocha; Cascon, Helena Matthews; Castro, Ítalo BragaThis is the first report on imposex occurrence in Pugilina morio. Imposex levels in P. morio from Ceara´ River Estuary were assessed by a non-lethal method. The obtained imposex parameters were: percentage = 37.1 %, female penis length index (FPLI) = 0.93 mm, relative penis length index (RPLI) = 6.5 %, and vas deferens sequence index (VDSI) = 1.0. Because imposex is induced by tributyltin, and P. morio is widel...
Osmorregulação em moluscos: o caso do bivalve estuarino tropical anomalocardia ...
Lima, Michella de Albuquerque; Soares, Marcelo de Oliveira; Paiva, Carolina Cerqueira; Osório, Frederico Moreira; Porfírio, André FerreiraEuryhalinity is a necessary characteristic in estuarine inhabitants. This study evaluated the osmoregulatory effects of salinity variations in the tropical estuarine bivalve Anomalocardia brasiliana. To estimate the osmoregulatory capabilities specimens were collected alive in estuary of Curu river, Ceará, and carried to the laboratory in containers with some water of the estuary. The osmoregulatory ability of ...
Population and reproductive biology of the fiddler crab Uca thayeri Rathbun, 19...
Bezerra, Luis Ernesto Arruda; Cascon, Helena MatthewsPopulation and reproductive biology of Uca thayeri Rathbun, 1900 were studied for the first time in a tropical mangrove. Absolute density, sex ratio, population structure, handedness, breeding season and fecundity were investigated. Seven transects were delimited in a mangrove area of the Pacoti River, Northeast of Brazil (3 430 0200 S/38 320 3500 W). On each transect, ten 0.25 m2 squares were sampled on a mont...