Population structure and fecundity of Scyllarides delfosi Holthuis, 1960 (Scyllaridae) on the Amazon continental shelf

Crustaceana ◽  
2018 ◽  
Vol 91 (9) ◽  
pp. 1027-1037 ◽  
Author(s):  
Francielly A. Lima ◽  
Jussara M. Martinelli-Lemos ◽  
Kátia C. A. Silva ◽  
Alex G. M. Klautau ◽  
Israel H. A. Cintra
Keyword(s):  
Population Structure ◽  
Life Cycle ◽  
Continental Shelf ◽  
Egg Size ◽  
Brazilian Coast ◽  
Economic Potential ◽  
Sustainable Exploitation ◽  
Northern Brazil ◽  
By Catch ◽  
Egg Diameter

Abstract The slipper lobster Scyllarides delfosi is an important resource captured by fishery fleets of red lobster (Panulirus argus westonii) in northern Brazil. Despite the economic potential of this species, information on its biological and fishery aspects is still nonexistent. This study was conducted using four-year data on slipper lobster (2001 and 2003, 2013 and 2014) to analyse population structure and estimate fecundity and egg size of S. delfosi. A total of 547 slipper lobsters, S. delfosi, were collected. Ovigerous females and individuals of all size classes were captured by the fleet, mostly individuals newly recruited to the adult stock. These lobsters showed a 7-mm decrease in total mean length over a period of 10 years. Fecundity ranged from 24,710 to 190,060 eggs and egg diameter ranged from 0.60 to 0.64 mm. Research on life cycle, reproduction, and growth of S. delfosi is essential to provide support for the sustainable exploitation of this species, which is considered by-catch on the northern Brazilian coast, and as such, has no adequate public policies regarding its management.

scholarly journals First confirmed record of Feresa attenuata (Delphinidae) for the Northern Brazilian Coast

2007 ◽  
Vol 7 (2) ◽  
pp. 313-315 ◽  
Author(s):  
Fagner Augusto de Magalhães ◽  
Rosana Griselda Garri ◽  
Carolina Herédia Tosi ◽  
Salvatore Siciliano ◽  
Sathyabama Chellappa ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Killer Whale ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Killer Whales ◽  
Poor Knowledge ◽  
Southeastern Coast ◽  
Northern Brazil ◽  
Short Beak

In Brazil only one confirmed stranding is known from an emaciated specimen collected along the southeastern coast. The aim of this work is to report a recent record of a pygmy killer whale from the coast of Maranhão State, northern Brazil. On 22 October 2005, through regular surveys conducted by Projeto Cetáceos do Maranhão team, a beach-worn skull of a pygmy killer whale was found on the Mangue Seco beach, at Caju Island, Maranhão State. The specimen was identified through peculiar features, such as a short beak, 11 teeth per row in the maxile and the distance between the anterorbital notch and the end of the toothrow. This stranding suggests that pygmy killer whales may use oceanic waters close to Maranhão continental shelf. This is the second confirmed stranding of F. attenuata for the Brazilian Coast and the first along the northern coast. The present record increases our poor knowledge on the cetacean fauna of the northern Brazilian coast.

Characterization of the Snail’s Carapace Collected at Coast of Brazilian’s State of Paraíba

2008 ◽  
Vol 396-398 ◽  
pp. 141-144
Author(s):  
R.S.C. Lima ◽  
Marcus Vinícius Lia Fook ◽  
Thiago Bizerra Fideles ◽  
A.C.B.M. Fook ◽  
Sara Verusca de Oliveira ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Infrared Spectroscopy ◽  
Calcium Carbonate ◽  
Brazilian Coast ◽  
Economic Potential ◽  
X Ray Diffraction ◽  
X Ray ◽  
Marine Snails ◽  
Northern Brazil

Calcium carbonate (CaCO3) is a ceramic of strong economic potential, given the versatility of its application in industry in many different areas. Protective shells of marine snails of the Brazilian coast were analyzed in this study, to verify the content of calcium carbonate available in this type of material. The samples were collected at Bessa´s Beach located in the João Pessoa’ coast Capital of Paraíba state, northern Brazil. The collection occurred during the month of February 2008; the sample was processed into powder and it was examined by X-ray Fluorescence (XRF), X-ray diffraction (XRD) and Infrared Spectroscopy with Fourier Trasformating (FTIR). The material was also submitted to heat treatment at 110°C and characterized by same techniques. The results confirmed the presence of a high content of calcium carbonate in the samples (over 95%,) which has not changed with the heat treatment used. It was presents the morphologies calcite and aragonite with prevalence of the second, both showing high levels of crystallinity. From the results obtained, calcium carbonate of the coast Paraíba has a potential application like bioceramic.

scholarly journals New records of the genus Agelas Duchassaing & Michelotti, 1864 (Porifera, Agelasida) off the Amazon River mouth, Brazil, Southwestern Atlantic

2007 ◽  
Vol 7 (3) ◽  
pp. 83-90 ◽  
Author(s):  
Beatriz Mothes ◽  
Maurício Campos ◽  
Cléa Lerner ◽  
João Luís Carraro ◽  
Fernando José Parra-Velandia
Keyword(s):  
Continental Shelf ◽  
New Records ◽  
River Mouth ◽  
First Record ◽  
Amazon River ◽  
Brazilian Coast ◽  
Southwestern Atlantic ◽  
New Information ◽  
Northern Brazil ◽  
First Time

This work provides new information on agelasid sponges found on the continental shelf off northern Brazil. Agelas sceptrum (Lamarck, 1815) and Agelas wiedenmayeri Alcolado, 1984 have their first record for the Brazilian coast. Agelas dispar Duchassaing & Michelotti, 1864 and Agelas schmidti Wilson, 1902, previously recorded from Brazil, are cited for the first time off the mouth of the Amazon River.

scholarly journals Diurnal variation effect in marine magnetometric surveys: clues from surveys in southeast Brazil

2021 ◽  
Vol 42 (3) ◽  
Author(s):  
Paula Possamai Sergipe ◽  
Yára Regina Marangoni ◽  
Roberto Paulo Zanon dos Santos ◽  
Denise Silva de Moura ◽  
Luigi Jovane
Keyword(s):  
Magnetic Field ◽  
Continental Shelf ◽  
Diurnal Variation ◽  
Brazilian Coast ◽  
Observatory Data ◽  
Before And After ◽  
Corrected Data ◽  
Well Correlation ◽  
The Magnetic Field ◽  
Magnetic Observatories

AbstractThe diurnal variation of the magnetic field cannot be predicted or modeled and for that reason, it is monitored during the magnetic surveys, usually by a stationary magnetometer. However, marine surveys have a practical issue with diurnal monitoring, owing to the distance between the survey, stationary magnetometers, and magnetic observatories. This work aims to verify the use of nearby magnetic observatories to estimate the diurnal variation correction in different marine surveys and evaluate its effectiveness. In this study, we selected surveys at the continental shelf near Santos city (Survey 1), continental slope next to the first survey location (Survey 2), continental shelf near Ubatuba city (Survey 3), and Mamanguá ria in the Paraty city (Survey 4), all southeast to the Brazilian coast. The crossing points were implemented to compare the magnetic field values at different times and days at the same measurement point, before and after the correction. Afterwards, we measure the Pearson’s Correlation of the raw data and the diurnal corrected data in all crossing points of each survey which showed an improvement after correction by the value approximating to 1, which indicates a very well correlation. The Ubatuba and Mamanguá surveys allowed comparing the observatory correction results with the base magnetometer results that were rather similar. Our analyses indicate a satisfactory diurnal correction using the observatory data and the crossing points approach, which can be used for every marine magnetometric survey worldwide placed near the coast (< 280 km) that do not have a stationary magnetometer available.

Life cycle and population structure of the terrestrial isopodHemilepistus klugii(Brandt, 1833) (Isopoda: Oniscidea) in Iran

2011 ◽  
Vol 45 (33-34) ◽  
pp. 2081-2094 ◽  
Author(s):  
Ghasem M. Kashani ◽  
Alireza Sari ◽  
Shidokht Hosseinie ◽  
Masoumeh Malek ◽  
Ehsan Entezari
Keyword(s):  
Population Structure ◽  
Life Cycle

scholarly journals Flowing into the unknown: inferred paleodrainages for studying the ichthyofauna of Brazilian coastal rivers

2018 ◽  
Vol 16 (3) ◽  
Author(s):  
Andréa T. Thomaz ◽  
L. Lacey Knowles
Keyword(s):  
Information System ◽  
Continental Shelf ◽  
Sea Level ◽  
Brazilian Coast ◽  
Strongly Correlated ◽  
Bathymetric Data ◽  
Biological Studies ◽  
Coastal Rivers ◽  
Coastal Basins ◽  
Geologic Data

ABSTRACT The eastern coastal basins of Brazil are a series of small and isolated rivers that drain directly into the Atlantic Ocean. During the Pleistocene, sea-level retreat caused by glaciations exposed the continental shelf, resulting in enlarged paleodrainages that connected rivers that are isolated today. Using Geographic Information System (GIS), we infer the distribution of these paleodrainages, and their properties for the east Brazilian coast. Specifically, using elevation/bathymetric data for the largest sea-level retreats during the Pleistocene, the paleodrainages, their area and the number of contemporary basins connected by each palaeodrainage, was inferred. For the 145 inferred paleodrainages, total paleodrainage area is strongly correlated with the contemporary area encompassed by each paleodrainage, as well as with the number of contemporary basins encompassed by a paleodrainage. Differences in the continental shelf exposure along the coast affected the degree of past connectivity among contemporary rivers. With our results freely available, we discuss how paleodrainages have tremendous utility in biological studies, especially in regions with limited geologic data. With respect to the diverse ichthyofauna of the Brazilian coast, and its high endemism, we highlight how the inferred paleodrainages provide a backdrop to test hypotheses about the effect of past riverine connectivity on diversity patterns.

scholarly journals Haplotype distribution and connectivity of the white sea urchin Tripneustes ventricosus across the Brazilian biogeographic province

2016 ◽  
Author(s):  
Wander O Godinho ◽  
Rodrigo Maggioni ◽  
Ana L Lacerda ◽  
Tito M C Lotufo
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Sea Urchin ◽  
White Sea ◽  
Sea Urchins ◽  
Marine Ecosystems ◽  
Brazilian Coast ◽  
The White Sea ◽  
Biogeographic Province ◽  
Fernando De Noronha

Sea urchins play important roles in marine ecosystems as key herbivores and some species have wide geographic range. The Atlantic white sea urchin Tripneustes ventricosus is abundant in many rock reefs of the eastern and western Atlantic, and may be found in high densities in Atolls and Archipelagos. Despite the importance of sea urchins in insular ecosystems, there is no study evaluating the genetic structure and the origin of the white sea urchin in isolated ecosystems. Such information is crucial to understand the connectivity and genetic diversity of these populations from the tropical Atlantic provinces. To evaluate the origin of the white sea urchin in Fernando de Noronha Archipelago and the genetic features of this population, we conducted studies on the population structure of the white sea urchin using mitochondrial DNA (COI), in two regions within the Brazilian biogeographic province and compared with other regions in the Atlantic. The white sea urchin from Fernando de Noronha was found to be genetically distinct, with FST ranging from 0.3 to 0.9 from other populations in Atlantic. The sharing of haplotypes between the Brazilian coast and the archipelago suggests that insular species derived from the Brazilian coast, rather than the East Atlantic. Moreover, all other Atlantic populations were genetically isolated, with low genetic diversity being a common characteristic among them (ranging from 0.0011 to 0.0022). The low connectivity found within populations might be related to the presence of soft barriers among the Brazilian biogeographic province. The low nucleotide diversity may also suggest that T. ventricosus may have undergone bottleneck processes at some stage of their evolution. This study has important implications on the geographic distribution, population structure and gene flow of the white sea urchin among the Atlantic regions. Further studies should evaluate the biological and ecological aspects of the species in both insular and continental marine ecosystems.

Fecundity and Egg Size of a Brood Stock of Salvelinus fontinalis × S. namaycush Hybrids (Splake)

1974 ◽  
Vol 31 (2) ◽  
pp. 217-220 ◽  
Author(s):  
G. B. Ayles
Keyword(s):  
Egg Size ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Lake Huron ◽  
Female Size ◽  
Brood Stock ◽  
Trout Population ◽  
Egg Diameter

Estimates of average egg diameter and average number of eggs per female from a brood stock of Salvelinus fontinalis × S. namaycush (splake) hybrids were 0.468 cm and 1169 eggs, respectively. Variation in egg size between females was attributable to variation in both size and age of the fish, whereas differences in fecundity were attributed only to differences in female size. At a given size a splake had more and larger eggs than have been reported for lake trout. The significance of the findings is discussed in relation to the reestablishment of a viable trout population in Lake Huron.

Deep-Ocean Exploitation Technology

1971 ◽  
Vol 8 (02) ◽  
pp. 145-158
Author(s):  
Raymond Kaufman
Keyword(s):  
Continental Shelf ◽  
Large Scale ◽  
Deep Ocean ◽  
Abandoned Mine ◽  
Economic Potential ◽  
Mining Method ◽  
Mine Shaft ◽  
Sea Floor ◽  
Ocean Mining ◽  
Air Lift

The paper discusses the latest techniques proposed for mining minerals from the deep ocean. Deep ocean is defined as the sea beyond the continental shelf, particularly areas of the sea floor exceeding 1200 ft in depth. The three principal deep-ocean minerals having economic potential in the immediate future are identified. Four recently proposed advanced deep-ocean mining concepts are presented. Use of the air-lift pump as a viable mining method is discussed and a large-scale air-lift pump experiment conducted in an abandoned mine shaft at Galax, Virginia is described. The principal features of the conversion of a small C1-M-AV1 type cargo ship to a deep-ocean mining prototype vessel, RV Deepsea Miner, is outlined.

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