Luiz Roberto Tommasi

Characterization of the benthic environment of a coastal area adjacent to an oil refinery, Todos os Santos Bay (NE-Brazil)

In order to determine the sedimentological and physico-chemical characteristics of the benthic environment and also the level, distribution and probable sources of aliphatic and polycyclic aromatic hydrocarbons, sediment samples were collected at 28 stations in the northeast portion of Todos os Santos Bay. The centre and the east region of the study area showed characteristics of depositional environments with the predominance of silt and clay and high percentages of TOC, nitrogen and sulphur. The molar C/N ratios varied between 8.8 and 27.6 indicating a mixed origin of organic matter with variable marine and continental contributions. Total aliphatic hydrocarbon concentrations ranged between 1.56 and 246.91 µg.g-1 dry weight, corresponding the high concentrations to the stations situated in the centre and in the east region of the study area. The UCM represented between 60 and 96% of the total aliphatic hydrocarbons, indicating a high degree of anthropogenic contribution and the presence of petroleum degraded residues. Total PAH concentrations varied from 8 to 4163 ng.g-1 dry weight. The highest total PAH concentration was recorded at station 5 situated adjacent to the oil refinery.

Equinodermes do Brasil: I. sôbre algumas espécies novas e outras pouco conhecidas, para o Brasil

Some echinoderms from the South Brazilian region are described. Seven are new to the science: Cucumaria manoelina sp.n., Thyone montoucheti sp.n., Psolus marcusi sp.n., Psolus vitoriae sp.n., Ophioderma divae sp.n., Amphioplus lucyae sp.n. and Chaetaster vanzolinicus sp.n. Some observations are presented on the distribution of Antedondubeni Bohlsche, 1886, Cucumaria pulcherrima (Ayres, 1854), Thyone belli Ludwig, 1887 and of Ophiothrix rathbuni Ludwig, 1882 in Brazilian marine shelf region.

Sôbre o braquiópode Bouchardia rosea (Mawe, 1823)

Benthic samples were taken at 303 stations in the Ilha Grande region, down the isobath of 50 meters. In 12 of these Stations (20 samples) we found the brachiopod Bouchardia rosea (Mawe, 1823). The highest density observed for this species was 58 individuals/m2. Its occurrence is related to sediments with less of 30% of granules smaller than 420 µ, without the fraction smaller than 44µ, to salinity higher than 35‰ and probably to the enrichement process due to nearness of islands and organic material carried from Sepetiba bay. Apparently, there are no relationship, between the lenght of the valve and the position of the station and with the depth. There are, apparently, a direct relationship with salinity and a inverse with temperature. There are a tendency of the median lenght of the valve, to decrease with the increase of the aggrefation of the species. There are, apparently, three generations of the individuals in the presently samples.

Resultados preliminares sobre os teores de detergentes aniônicos na Baía e Estuário de Santos

Os maiores niveis de detergentes foram obtidos no interior do Canal de Santos, em frente ao Canal 6 e na regiao do difusor do emissario submarino de esgostos de Santos. Ha, assim, tres fontes principais de detergentes para a regiao: a) o complexo industrial de Cubatao - Sistema Billings; b) a cidade de Santos (ligacoes clandestinas de esgotos), e c) o emissario submarino. Os niveis de detergentes obtidos variaram de 0,11 a 0,97 ppm ABS.

Equinodermes da região entre o Amapá (Brasil) e a Flórida (E.U.A.) II: echinozoa

The echinozoan species collected by the Exploratory Fishing and Gear Research Base of Pascagoula, Mississipi, U.S.A., between the Southwest region of U.S.A. and the Amapa (Brasil) are listed. The geo graphical distribution of twenty two species is extended. A new species, Thyone pawsoni sp. n., is described.

Equinodermes do Brasil: III. observações sobre algumas espécies coletadas durante as viagens do N/Oc. "Almirante Saldanha"

The geographical distribution of Holothuria (Cystipus) pseudofossor, Stylocidaris lineata, Clypeaster (Clypeaster) rosaceus Chaetaster longipes Luidia barbadensis, Amphiura princeps, Ophiophragmus pulcher and Amphipholizona delicata is extended to the Brazilian region. Cladodactyla croces and Pseudocnus perrieri were collected in the region near Mar del Plata (Argentina) and Pseudoonus dubiosus and Chiridota marenzelleri , in front of Uruguay.

Equinodermes do Brasil: V. Sobre algumas espécies coletadas durante viagens do N/Oc. "Prof. W. Besnard"

The occurrence of Tosia parva (Perrier, 1881), Marginaster pectinatus Perrier, 1884 and Ldbidiaster radiosus Liltken, 1871 in the South Atlantic region is registered for the first time. The new varieties, Phrixometra longispina brasiliensis var. n., and Holothuria (Vaneyothuria) lentiginosa brasiliensis var. n., are de scribed. The genus Calliophidiaster Tommasi, 1970 is redescribed and its differences with Linckia Nardo, 1934, are reinforced. Ophiomyxa vivipara Studer, 1886 and Ophiura fallax Cherbonnier, 1959 are de scribed for the first time from Brazil. Amphiura iraciae sp. n. and A. rosae sp. n. are described.

Equinodermes do Brasil: II. equinodermes da baía do Trapandé, situada no complexo estuarino-lagunar de Cananéia, SP

The echinoderm fauna of the estuarine lagunar complex of Cananeia (Sao Paulo) is described. Some observations on the density and distri bution of the eight species found in the region are presented. Three species are found in great density, i.e., Mellita quinquiesperforata (echinoidea), Ophiaotys savignyi and Ophiothrix angulata (ophiuroi dea). The species found in most stations was Micropholis subtilis. Asteroids, holothurioids and crinoids are not recorded in the present samples.

Nota sôbre os fundos detríticos do circalitoral inferior da plataforma continental brasileira ao sul do Cabo Frio (RJ)

Some observations on the circalittoral benthic fauna of the region south of Cabo Frio (RJ) are presented. This fauna is similar to that of Mediterranean and Oriental Atlantic region.

Asteroidea de la plataforma continental de Rio Grande do Sul (Brasil), coleccionados durante los viajes del N/Oc. "Prof. W. Besnard" para el Proyecto Rio Grande do Sul

1 - La hidrologia del area estudiada, entre las latitudes 29o y 34oS, es muy compleja y esta influenciada por aguas tropicales traidas por la Corriente de Brasil, por aguas subantarticas traidas por la Corriente de las Malvinas, por las aguas del estuario del Rio de La Plata y por la presencia cercana de la Convergencia Subtropical. 2 - Las aguas que cubren la plataforma continental del Estado de Rio Grande do Sul pueden clasificarse como Aguas Costeras de Influencia Tropical (ACIT), Aguas del Talud Continental (AT) y Aguas Costeras de Influencia Subantartica (ACISA) originadas casi exclusivamente por procesos de mezcla. 3 - En otono e invierno es mayor la influencia de las ACISA, AT y las aguas del estuario del Rio de La Plata sobretodo en la region septentrional del area estudiada; ocurren inversiones de temperatura y predominan los procesos de mezcla sobre los de interaccion oceano-aire. 4 - En primavera y verano es mayor la influencia de las ACIT; predominan los procesos de interaccion oceano-aire sobre los de mezcla y se encuentra evidencia sugiriendo la ocurrencia de resurgencias en varios puntos. 5 - Los procesos hidrograficos del area estudiada varian estacionalmente y ademas anualmente segun las condiciones meteorologicas reinantes. 6 - La fauna de Asteroidea de Rio Grande do Sul comprende cinco ordenes, nueve familias, 15 generos y 24 especies. 7 - El area estudiada tiene una fauna de asteroideos principalmente tropical y subtropical pero incluye elementos subantarticos y antarticos. Los primeros se encuentran sobretodo al norte del paralelo de 31oS mientras que los segundos ocurren principalmente al sur de ese paralelo. Constituye esto evidencia adicional a la hipotesis de que el area estudiada comprende dos regiones hidrograficas con su division aproximada en el paralelo 31oS. 8 - Se reportan ocho nuevas ocurrencias: Labidiaster radiosus Lutken, Luidla clathrata (Say), Marginaster pectinatus Perrier, Mediaster trindadensis Bernasconi, Sclerasterias subangulosa (Verrill) y Tosia parva (Perrier) siendo nuevas ocurrencias para el area de estudio y Luidla barbadensis Perrier y L. elegans Perrier siendo nuevas ocurrencias para Brasil. 9 - El genero Pectinidiscus Ludwig se reporta por la primera vez para las Americas y se describe una nueva especie: Pectinidiscus aliciae. Se compara con las otras dos especies conocidas del genero, P. annae y P. sibogae.