oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Extension of the geographical distribution of some brachyuran and porcellanid decapods (Crustacea) to the coast of the State of S?o Paulo, Brazil
Alves, Douglas F. R.;Cobo, Valter J.;Melo, Gustavo A. S. de;
Revista Brasileira de Zoologia , 2006, DOI: 10.1590/S0101-81752006000400045
Abstract: investigations of the distribution of marine organisms provide a better understanding of the patterns of distribution and dispersal of these animals. extensions of the distributional limits of decapod crustaceans in brazilian waters have been recorded steadily and gradually, but these limits still remain poorly understood. the present study provides information extending the known range of eight species of brachyuran crabs and one species of porcellanid crab. the animals were obtained by scuba diving during a sampling program carried out near vitória island, ilhabela, on the northeastern coast of the state of s?o paulo (23o44'04"s-45o01'35"w) between february, 2004 and january, 2005. these new records extend the geographical distributions of the porcellanid petrolisthes amoenus (guérin menéville, 1855), the majoids mithrax caribbaeus rathbun, 1920, mithrax verrucosus h. milne edwards, 1832, nemausa acuticornis (stimpson, 1871) and teleophrys ornatus rathbun, 1901, and the xanthoids domecia acanthophora acanthophora (desbonne & schramm, 1867), garthiope spinipes (a. milne edwards, 1880), xanthodius denticulatus (white, 1847) and xanthodius parvulus (fabricius, 1793) to the s?o paulo coast. these new records may be related to different mechanisms of larval dispersal, larval transport by ballast water, or may simply be exceptional records.
A preliminary laboratory study on the salinity and temperature tolerances of some medusae from the S?o Paulo coast, Brazil
Moreira, Glória Soares;
Boletim do Instituto Oceanográfico , 1978, DOI: 10.1590/S0373-55241978000200002
Abstract: the salinity and temperature tolerances of some species of medusae were studied in the laboratory. the results showed the following order of tolerances in diluted seawater: cirrholovenia tetranema, clytia cylindrica and eucheilota duodecimalis > proboscidactyla ornata and obelia spp. > euphysora gracilis, ectopleura dumortieri, liriope tetraphylla and cunina octonaria. in relation to the decrease of temperature, the following results were obtained: ectopleura dumortieri, euphysora gracilis, obelia spp. and proboscidactyla ornata > liriope tetraphylla > cunina octonaria > clytia cylindrica and eucheilota duodecimalis. the results obtained in laboratory were discussed in relation to the distribution of the species in nature.
A preliminary laboratory study on the salinity and temperature tolerances of some medusae from the S?o Paulo coast, Brazil
Moreira, Glória Soares;
Brazilian Journal of Oceanography , 1978, DOI: 10.1590/S1679-87591978000200002
Abstract: the salinity and temperature tolerances of some species of medusae were studied in the laboratory. the results showed the following order of tolerances in diluted seawater: cirrholovenia tetranema, clytia cylindrica and eucheilota duodecimalis > proboscidactyla ornata and obelia spp. > euphysora gracilis, ectopleura dumortieri, liriope tetraphylla and cunina octonaria. in relation to the decrease of temperature, the following results were obtained: ectopleura dumortieri, euphysora gracilis, obelia spp. and proboscidactyla ornata > liriope tetraphylla > cunina octonaria > clytia cylindrica and eucheilota duodecimalis. the results obtained in laboratory were discussed in relation to the distribution of the species in nature.
On the seasonal occurrence of appendicularians in waters off the coast of S?o Paulo state
Tundisi, T. M;
Boletim do Instituto Oceanográfico , 1970, DOI: 10.1590/S0373-55241970000100005
Abstract: studies were made on the seasonal variation and qualitative composition of the appendicularia population from a limited area of the south atlantic 25o09.5's to 24o04.0's latitude and 47o48.4'w to 46o00.4'w longitude at the s?o paulo state coast off cananéia and off santos. the pattern of the seasonal variation was irregular for the most important species (o. longicauda). some qualitative differences regarding the species composition are discussed.
On the seasonal occurrence of appendicularians in waters off the coast of S?o Paulo State
Tundisi, T. M;
Brazilian Journal of Oceanography , 1970, DOI: 10.1590/S1679-87591970000100005
Abstract: studies were made on the seasonal variation and qualitative composition of the appendicularia population from a limited area of the south atlantic 25o09.5's to 24o04.0's latitude and 47o48.4'w to 46o00.4'w longitude at the s?o paulo state coast off cananéia and off santos. the pattern of the seasonal variation was irregular for the most important species (o. longicauda). some qualitative differences regarding the species composition are discussed.
The phytoplankton biodiversity of the coast of the state of S?o Paulo, Brazil
Villac, Maria Célia;Cabral-Noronha, Valéria Aparecida de Paula;Pinto, Thatiana de Oliveira;
Biota Neotropica , 2008, DOI: 10.1590/S1676-06032008000300015
Abstract: the objective of this study is to compile the inventory of nearly 100 years of research about the phytoplankton species cited for the coast of the state of s?o paulo, brazil. a state-of-the-art study on the local biodiversity has long been needed to provide a baseline for future comparisons. this type of data is scattered in old scientific journals and in the so-called "grey literature", and are in need of nomenclature updating. twenty-six publications are considered. the earliest sampling record is from 1913 (?) and the most recent from 2002. this checklist compiled from the literature was complemented with primary data collected between august 2004 and july 2006, recent surveys of the surf-zone of 20 beaches located along the coast and of a mariculture farm at the cocanha beach, caraguatatuba. the complete species list includes 572 taxa: most are diatoms (82%), seconded by dinoflagellates (16%), with a minor contribution of silicoflagellates, coccolithophorids, ebriideans and cyanobacteria. the most investigated areas were: ubatuba, s?o sebasti?o, santos and cananéia. the recent surveys have a broader spatial coverage. the objectives of the studies have changed over the years from purely taxonomic to process-oriented investigations. therefore, the longest species lists and most first records for the area were published before the 1980's and later publications, even those in which cell counts were performed, mention only the most abundant/frequent species. electron microscopy was used for the first time in the present surveys, and new records include 38 diatoms, 42 dinoflagellates, 1 silicoflagellate, 1 ebriidean and 2 cyanobacteria. the use and interpretation of this species list require the perception of some constraints. it is not our role to question the identification made by other researchers. on the other hand, the ability to sample, analyze and identify species has evolved over the years and some considerations in this regard are presented.
Cetacean records along S?o Paulo state coast, Southeastern Brazil
Santos, Marcos César de Oliveira;Siciliano, Salvatore;Vicente, André Fabiano de Castro;Alvarenga, Fernando Siqueira;Zampirolli, émerson;Souza, Shirley Pacheco de;Maranho, Andréa;
Brazilian Journal of Oceanography , 2010, DOI: 10.1590/S1679-87592010000200004
Abstract: the s?o paulo state (sp) coast (23o18's, 44o42'w; 25o14's, 48o01'w) is of approximately 600 km in length, bordering the western atlantic ocean, in southeastern brazil. cetacean sightings and strandings have long been observed throughout this area. scattered data from scientific publications, skeletal remains in museums, photographs and articles from newspaper files, universities and aquaria have been organised and updated since 1993. field investigations on strandings and sightings have also been conducted. a total of 29 cetacean species have been recorded, including 7 baleen whales (mysticeti) and 22 toothed whales (odontoceti), as follows: balaenoptera physalus, b. borealis, b. edeni, b. acutorostrata, b. bonaerensis, megaptera novaeangliae, eubalaena australis, physeter macrocephalus, kogia breviceps, k. sima, berardius arnuxii, mesoplodon europaeus, m. mirus, ziphius cavirostris, orcinus orca, feresa attenuata, globicephala melas, g. macrorhynchus, pseudorca crassidens, delphinus capensis, lagenodelphis hosei, steno bredanensis, tursiops truncatus, stenella frontalis, s. longirostris, s. coeruleoalba, lissodelphis peronii, sotalia guianensis and pontoporia blainvillei. several species have been observed only once and include strays from their areas of common distribution, as well as species with known preferences for offshore distribution. others, such as p. blainvillei and s. guianensis, are common coastal dwellers year-round. z. cavirostris, p. crassidens and l. hosei are reported for the first time on the sp coast.
Populations analysis of the Brazilian Sharpnose Shark Rhizoprionodon lalandii (Chondrichthyes: Carcharhinidae) on the S?o Paulo coast, Southern Brazil: inferences from mt DNA sequences
Mendon?a, Fernando Fernandes;Oliveira, Claudio;Gadig, Otto Bismarck Fazzano;Foresti, Fausto;
Neotropical Ichthyology , 2009, DOI: 10.1590/S1679-62252009000200012
Abstract: sharks of the genus rhizoprionodon can be considered some of the most important predators along the trophic coastal marine ecosystems and represent an important economic resource for the small-scale fisheries, especially on the brazilian coastline. in order to analyze the population structure of the shark rhizoprionodon lalandii of s?o paulo, southeastern coast of brazil, levels of genetic diversity were identified by nucleotide sequence analyses of the mitochondrial dna control region. the results obtained from this study present moderate values of haplotype diversity and low nucleotide diversity. although the amova tests (φst = 0.08394, p < 0.01) had shown slightly differences among the studied samples, evidence for the occurrence of population structuring was not found, which may be a general feature of sharks living in coastal areas.
Headland-bay beach planform stability of Santa Catarina State and of the Northern Coast of S?o Paulo State
Silveira, Lucas F.;Klein, Antonio H. da F.;Tessler, Moysés G.;
Brazilian Journal of Oceanography , 2010, DOI: 10.1590/S1679-87592010000200003
Abstract: this paper presents the results of the planform stability classification for the headland-bay beaches of the state of santa catarina and of the northern coast of s?o paulo, based on the application of the parabolic bay-shape equation (pbse) to aerial images of the beaches, using the software mepbay?. for this purpose, georeferenced mosaics of the quickbird2? satellite imagery (for the state of santa catarina) and vertical aerial photographs (for the northern coast of s?o paulo state) were used. headland-bay beach planform stability can be classified as: (1) in static equilibrium, (2) in dynamic equilibrium, (3) unstable or (4) in a state of natural beach reshaping. static equilibrium beaches are the most frequent along the coast of the state of santa catarina and the northern shore of s?o paulo, notably along the most rugged sectors of the coast and those with experiencing lower fluvial discharge. by comparison, dynamic equilibrium beaches occur primarily on the less rugged sectors of the coast and along regions with higher fluvial discharge. beaches in a state of natural beach reshaping have only been found in sc, associated with stabilized estuarine inlets or port breakwaters. however, it is not possible to classify any of these beaches as unstable because only one set of images was used. no clear relation was observed between a beach's planform stability and other classification factors, such as morphodynamics or orientation.
Use of Pristis spp. (Elasmobranchii: Pristidae) by Hunter-Gatherers on the Coast of S?o Paulo, Brazil
Gonzalez, Manoel M. B.;
Neotropical Ichthyology , 2005, DOI: 10.1590/S1679-62252005000300010
Abstract: artifacts made from rays (rostral teeth and spine) are very common in shell mounds on the coast of s?o paulo, brazil. the presence of the genus pristis among the studied species of elasmobranch fishes in this shell mounds reinforces the hypothesis these animals occurred in southeastern brazil, and were used by hunter-gatherers. i analyzed twelve rostral teeth of the genus pristis from shell mounds. the teeth have artificial marks left from making arrows and harpoons. the basic function of the teeth found in these shell mounds was the production of tools and ornaments. from the analyzed teeth, ten (83%) were associated to the faunal remain and two (17%) were associated with burials, and they can be considered as ceremonial or votive elements. there had been no new records of occurrence of the genus pristis on the coast of s?o paulo state in brazil, and there are a few studies on the use of their products in many ancient and contemporary human communities. this paper provide data about the distribution of rays of this genus in archaeological sites and the use of this resource by hunter-gatherers on the coast of s?o paulo.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.