scholarly journals Morphometric analysis of Littoraria angulifera (Caenogastropoda) in estuarine regions of northeastern Brazil

2020 ◽  
Vol 80 (2) ◽  
pp. 424-430
Author(s):  
G. C. Zeidan ◽  
L. A. Freitas ◽  
G. B. M. Santos ◽  
E. M. Silva-Neto ◽  
G. Boehs
Keyword(s):  
Morphometric Analysis ◽  
Reproductive Tract ◽  
Human Impacts ◽  
Shell Height ◽  
South Atlantic ◽  
Northeastern Brazil ◽  
Artificial Substrates ◽  
Concrete Walls ◽  
Sampling Points ◽  
Reproductive Apparatus

Abstract The gastropod Littoraria angulifera (Littorinidae) is an exclusively estuarine mollusk with Neotropical anfiatlantic distribution. Recent studies indicate a possible use of the species as bioindicator. The aim of this study was to analyze the shell height, as well as to perform a morphometric analysis of the reproductive apparatus of L. angulifera collected in 22 sampling points located between latitudes 13º54'S and 15º44'S in the South Atlantic, State of Bahia, Northeastern Brazil. The specimens were obtained in different estuarine environments including mangroves, as well as on rocks and concrete walls in places close to ports, shipyards and berths during January and February 2014. All specimens (n = 880) were analyzed regarding the sex and shell height/morphology, 440 were analyzed about the reproductive apparatus morphometry and 15 in histological description. The average shell height of animals from artificial substrates in nautical areas was lower (p<0.05) than the animals from mangroves, mainly in preserved areas, evidencing relation with human impacts and desiccation. The morphometric analysis of L. angulifera reproductive tract allowed us to conclude that the length of prostate in males and of palial oviduct in females may be useful in the reproductive evaluation of the species.

scholarly journals Histological characterization of reproductive tract and fetal annexes of the West Indian Manatee (Trichechus manatus) from Brazil

2018 ◽  
Vol 38 (11) ◽  
pp. 2166-2174 ◽  
Author(s):  
Arielle R. Bezerra ◽  
Carminda S.B. Salmito-Vanderley ◽  
Paulo R.O. Bersano ◽  
Vitor L. Carvalho ◽  
Ana C.O. Meirelles ◽  
...  
Keyword(s):  
Reproductive Tract ◽  
West Indian ◽  
Recovery Phase ◽  
Northeastern Brazil ◽  
The West ◽  
Inflammatory Infiltration ◽  
Trichechus Manatus ◽  
Tissue Samples ◽  
Mature Phase ◽  
West Indian Manatee

ABSTRACT: The West Indian manatee (Trichechus manatus) is one of the most threatened aquatic mammals in Brazil, and is currently classified as “endangered” (MMA). The objective of this study was to characterize histologically the reproductive tract and fetal annexes of stranded manatees in northeastern Brazil. Tissue samples were collected from the reproductive tract of 23 manatees, which were fixed in 10% buffered formalin, processed using standard histological protocols and stained with hematoxylin eosin. We qualitatively described the histological and histomorphometric characteristics of each structure. Six ovaries were analyzed. In four ovaries, we found a large number of primordial and primary follicles. Two ovaries were different from the others: one had inflammatory infiltration and the other had a thickening in the cortex and absence of follicles. We also analyzed seven uteri (of which four were in the proliferative phase, two in the secretory phase, and one in the recovery phase), four placentas, one vagina, six testes (four were in the immature phase, one in the pubertal phase, and one in the mature phase), two epididymides, two penises, and one umbilical cord. The histological and morphometric findings in our work will support future analyses of the reproductive tract of T. manatus from Brazil.

scholarly journals Molecular Identification and Traceability of Illegal Trading inLignobrycon myersi(Teleostei: Characiformes), a Threatened Brazilian Fish Species, Using DNA Barcode

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Alexandre dos Santos Rodrigues ◽  
José Henrique Souza Galdino Brandão ◽  
Jamille de Araújo Bitencourt ◽  
Ricardo Jucá-Chagas ◽  
Iracilda Sampaio ◽  
...  
Keyword(s):  
Molecular Identification ◽  
Fish Species ◽  
Human Impacts ◽  
Local Population ◽  
Dna Barcode ◽  
Northeastern Brazil ◽  
Genetic Stocks ◽  
Population Structuring ◽  
Fresh Frozen ◽  
Coi Sequences

Lignobrycon myersiis a threatened freshwater fish species and endemic of a few coastal rivers in northeastern Brazil. Even though the Brazilian laws prohibit the fisheries of threatened species,L. myersiis occasionally found in street markets, being highly appreciated by local population. In order to provide a reliable DNA barcode dataset forL. myersi, we compared mitochondrial sequences of cytochrome c oxidase subunit I (COI) from fresh, frozen, and salt-preserved specimens. Phylogenetically related species (Triportheusspp.) and other fish species (Astyanax fasciatus) commonly mixed withL. myersiin street markets were also included to test the efficiency of molecular identification. In spite of the differences in conservation processes and advanced deterioration of some commercial samples, high-quality COI sequences were obtained and effective in discriminatingL. myersispecimens. In addition, while populations from Contas and Almada River basins seem to comprise a single evolutionary lineage, the specimens from Cachoeira River were genetically differentiated, indicating population structuring. Therefore, DNA barcoding has proved to be useful to trace the illegal trading ofL. myersiand to manage threatened populations, which should focus on conservation of distinct genetic stocks and mitigation on human impacts along their range.

scholarly journals Interactive effects of environmental variability and human impacts on the long-term dynamics of an Amazonian floodplain lake and a South Atlantic coastal lagoon

Limnologica ◽  
2009 ◽  
Vol 39 (4) ◽  
pp. 306-313 ◽  
Author(s):  
Reinaldo L. Bozelli ◽  
Adriano Caliman ◽  
Rafael D. Guariento ◽  
Luciana S. Carneiro ◽  
Jayme M. Santangelo ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Environmental Variability ◽  
Human Impacts ◽  
South Atlantic ◽  
Interactive Effects ◽  
Floodplain Lake ◽  
Atlantic Coastal

scholarly journals First record of Kryptolebias hermaphroditus Costa, 2011 (Cyprinodontiformes: Rivulidae) in the extreme north Atlantic Forest mangroves, Rio Grande do Norte state, Brazil

Check List ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 1656 ◽  
Author(s):  
Mateus Germano Souza Lira ◽  
Roney Emanuel Costa de Paiva ◽  
Telton Pedro Anselmo Ramos ◽  
Sergio M. Q. Lima
Keyword(s):  
North Atlantic ◽  
Human Impacts ◽  
Rio Grande ◽  
First Record ◽  
Shrimp Farming ◽  
Northeastern Brazil ◽  
First Occurrence ◽  
Self Fertilization ◽  
Extreme North ◽  
Favorable Conditions

This study records the first occurrence of Kryptolebias hermaphroditus Costa, 2011 in canals or perennial salty water pools in two mangroves of the Rio Grande do Norte state, in the estuaries of Ceará-Mirim River and Curimataú River. Due to its hermaphroditism and self-fertilization, a unique feature among vertebrates, this species is very important for many biological areas. Kryptolebias hermaphroditus depends on favorable conditions for their development, therefore, human impacts such as shrimp farming and removal of native vegetation from mangroves may affect populations of this species in northeastern Brazil.

scholarly journals EFFECTS OF AESTIVATION DURATION ON TESTOSTERONE, HAEMOLYMPH BIOCHEMICAL PARAMETERS AND REPRODUCTIVE TRACT DIMENSIONS AND WEIGHT OF GIANT AFRICAN LAND SNAIL (Archachatina marginata) DURING DRY SEASON

2020 ◽  
Vol 19 (1) ◽  
pp. 17-28
Author(s):  
J. A. ABIONA ◽  
O. M. ADEEYO ◽  
M. O. ABIOJA ◽  
C. K. AINA ◽  
O. Y. AYO-AJASA ◽  
...  
Keyword(s):  
Total Protein ◽  
Biochemical Parameters ◽  
Reproductive Tract ◽  
Vas Deferens ◽  
Testis Weight ◽  
Testosterone Concentration ◽  
Albumen Gland ◽  
Vaginal Length ◽  
Reproductive Apparatus ◽  
Somatic Index

Aestivation is a process of metabolic inactivity under which energy reserve are manipulated for survival. Reproductive apparatus and haemolymph biochemical agents also undergo phase manipulation as the duration continues. To determine the physiological influence on key hormone of reproduction and reproductive apparatus, seventy five A. marginata snails were used for this study. The snails were divided into five treatments with fifteen replicate each. Treatment include: Zero (0) week, Three (3) weeks, Six (6) weeks, nine (9) weeks and six (6) weeks post-aestivation. Parameters measured were: Testosterone concentration, haemolymph biochemical parameters (Total protein, albumin, globulin, Aspartate transaminase (AST) and Alanine transaminase (ALT), dimensions (length) and weight of the organs and tissues of the reproductive tracts (Ovo-testis, penis, vaginal, oviduct, little hermaphrodite duct, common hermaphrodite duct, vas deferens and albumen gland) gonado-somatic index and percentage mortality. Result showed that level of testosterone at three and six weeks of aestivation significantly reduced compared to the control. Also, at nine weeks of aestivation, the reduction was significantly greater than what was recorded at both three and six weeks of aestivation. But the testosterone levels were reversed at nine weeks post aestivation. Total protein and globulin were significantly influenced with both reaching a peak value at 9 weeks of aestivation while ALT, AST and albumin were not significantly affected. So also, of all the reproductive tract parts measured, organ weight, ovo-testis weight, penis weight and length were significantly influenced (P<0.001; P<0.001; P<0.05; P<0.001). Similarly, vaginal weight, oviduct weight, little hermaphrodite duct weight and length were also significantly affected  together with vas deferens  length and albumen gland length while aestivation duration had no significant influence on reproductive tract weight, ovo-testis length, vaginal length, oviduct length, little hermaphrodite duct length, vas deferens weight and albumen gland weight. Similarly, gonado-somatic index was also not significantly affected by aestivation duration. It was also obvious from this study that the highest mortality was recorded at 6 weeks of aestivation, followed by 9 weeks of aestivation while 3weeks and 6 weeks post-aestivation had the least mortality with the control intact. In conclusion, it is clear from this study that aestivation duration significantly influenced testosterone concentration, haemolymph biochemical parameters and some selected reproductive apparatus of A. marginata.        

scholarly journals Projected End-of-Century Changes in the South American Monsoon in the CESM Large Ensemble

2020 ◽  
Vol 33 (18) ◽  
pp. 7859-7874
Author(s):  
Ana Claudia Thome Sena ◽  
Gudrun Magnusdottir
Keyword(s):  
South America ◽  
South Atlantic ◽  
Northeastern Brazil ◽  
Southeastern Brazil ◽  
South American ◽  
The South ◽  
Wet Season ◽  
Large Ensemble ◽  
South American Monsoon ◽  
The Mean

AbstractProjected changes in the South American monsoon system by the end of the twenty-first century are analyzed using the Community Earth System Model Large Ensemble (CESM-LENS). The wet season is shorter in LENS when compared to observations, with the mean onset occurring 19 days later and the mean retreat date 21 days earlier in the season. Despite a precipitation bias, the seasonality of rainfall over South America is reproduced in LENS, as well as the main circulation features associated with the development of the South American monsoon. Both the onset and retreat of the wet season over South America are delayed in the future compared to current climate by 3 and 7 days, respectively, with a slightly longer wet season. Central and southeastern Brazil are projected to get wetter as a result of moisture convergence from the strengthening of the South Atlantic low-level jet and a weaker South Atlantic subtropical high. The Amazon is projected to get drier by the end of the century, negatively affecting rain forest productivity. During the wet season, an increase in the frequency and intensity of extreme precipitation events is found over most of South America, and especially over northeastern and southern Brazil and La Plata. Meanwhile, during the dry season an increase in the maximum number of consecutive dry days is found over northeastern Brazil and the northern Amazon.

scholarly journals On the occurrence of a less usual rainfall pattern in northeastern Brazil during the 2019 El Niño

2021 ◽  
Author(s):  
Victor Azevedo Godoi ◽  
Felipe M. de Andrade
Keyword(s):  
El Niño ◽  
Heavy Rainfall ◽  
El Nino ◽  
Lower Troposphere ◽  
Longwave Radiation ◽  
South Pacific ◽  
South Atlantic ◽  
Northeastern Brazil ◽  
Rainfall Pattern ◽  
Average Rainfall

Abstract El Niño is generally associated with below-average rainfall in northeastern Brazil (NEB). In 2019, however, the opposite rainfall pattern was observed during an El Niño episode. Here, we explore the mechanisms that overwhelmed typical El Niño-related conditions and resulted in above-average rainfall in NEB. We focus on the austral autumn, when El Niño is most related to rainfall anomalies in the region. The analysis of rainfall data from weather stations and the Global Precipitation Climatology Project, upper- and lower-level circulation reanalysis data, sea surface temperature data, outgoing longwave radiation data, and modelled data allowed us to identify that the autumn 2019 heavy rainfall in NEB was likely associated with three combined factors; these are: (1) the weak intensity of the 2019 El Niño; (2) local and remote diabatic heating anomalies, especially over the western South Pacific and tropical South Atlantic, which resulted in anticyclonic and cyclonic circulations in the upper and lower troposphere, respectively, over the tropical South Atlantic; and (3) sub-seasonal atmospheric convection anomalies over the western South Pacific, which reinforced the low-frequency convection signal over that region. This latter factor suggests the influence of the Madden–Julian Oscillation on rainfall in NEB during the first ten days of March. We discuss these mechanisms in detail and provide evidence for their associations with the anomalously heavy rainfall in NEB. Our results may assist in the planning of several crucial activities, such as water resources management and agriculture.

scholarly journals Ichthyofauna of coastal lakes and the Igaraçu River in Ilha Grande, Delta do Parnaíba, Parnaíba, Piauí State, northeastern Brazil

Check List ◽  
2014 ◽  
Vol 10 (6) ◽  
pp. 1270 ◽  
Author(s):  
Filipe Augusto Gonçalves de Melo ◽  
Rennan Do Nascimento Melo ◽  
Lucas Borges de Resende
Keyword(s):  
Alien Species ◽  
Fish Species ◽  
Coastal Area ◽  
Oreochromis Niloticus ◽  
Wind Farm ◽  
Northeastern Brazil ◽  
Coastal Lakes ◽  
Sampling Points ◽  
Northeastern State ◽  
Abundance And Distribution

This study aims to provide a list of fish species from the Igaraçu River and some lakes of the lower Parnaíba River, Delta do Parnaíba, northeastern state of Piauí, Brazil. Eleven collecting points were sampled in a coastal area, in a wind farm, during the dry season in November 2011. A total of 1,023 individuals of 24 species, 13 families and 6 orders were collected. The most representative families in number of species were Characidae, Cichlidae and Curimatidae, respectively. Astyanax aff. bimaculatus, Serrapinnus piaba and Psellogrammus kennedyi presented the greatest abundance and distribution among the sampling points. Oreochromis niloticus was the only alien species captured. No fishes were captured in five sampling sites. Voucher material is deposited in a new zoological collection, “Coleção Zoológica do Delta do Parnaíba”.

scholarly journals New records of red seaweeds to the coast of Ceará State, northeastern Brazil

Hoehnea ◽  
2018 ◽  
Vol 45 (2) ◽  
pp. 323-348 ◽  
Author(s):  
Luanda Pereira Soares ◽  
Pedro Bastos de Macedo Carneiro ◽  
Mutue Toyota Fujii
Keyword(s):  
Geographic Distribution ◽  
New Records ◽  
Atlantic Coast ◽  
South Atlantic ◽  
Northeastern Brazil ◽  
Brazilian Coast ◽  
Floristic Survey ◽  
Red Seaweeds ◽  
South Atlantic Coast ◽  
First Time

ABSTRACT A recent floristic survey of Rhodophyta from Ceará State, Brazil (02º46'30''-07º52'15''S and 37º14'54''-41º24'45''W), revealed the occurrence of 113 species distributed into 14 orders, 28 families and 63 genera. Of these, 18 species belonging to seven orders are new records; some of them poorly described and illustrated in the literature or cited only checklists. Therefore, aiming to expand the taxonomic knowledge about these poorly known species, we present detailed descriptions, illustrations, and comments on related taxa. The occurrence of Ceratodictyon scoparium is confirmed for the South Atlantic coast. The male gametophytes of Dohrniella antillarum var. brasiliensis and tetrasporophytes of Gracilariopsis silvana are illustrated for the first time. Ceramium fujianum is a new addition to northeastern Brazil. Among the new records, Callithamnion corymbosum, Ceramium clarionense, C. fujianum and C. scoparium showed a significant expansion of their geographic distribution along the Brazilian coast. Most of the newly recorded species are filamentous, small-sized or tufted algae, highlighting the need for new collections to detect the presence of these components.

scholarly journals Relationship between spatial distribution of chaetognaths and hydrographic conditions around seamounts and islands of the tropical southwestern Atlantic

2014 ◽  
Vol 86 (3) ◽  
pp. 1151-1165 ◽  
Author(s):  
CHRISTIANE S. DE SOUZA ◽  
JOANA A.G. LUZ ◽  
PAULO O. MAFALDA JUNIOR
Keyword(s):  
Spatial Distribution ◽  
Water Column ◽  
Water Mass ◽  
South Atlantic ◽  
Northeastern Brazil ◽  
Southwestern Atlantic ◽  
The South ◽  
Water Column Stability ◽  
South Atlantic Central Water ◽  
Hydrographic Conditions

Relationship between spatial distribution of chaetognaths and hydrographic conditions around seamounts and islands off Northeastern Brazil were analyzed from 133 oceanographic stations during the months of January – April of 1997 and April – July of 1998. Oblique zooplankton tows, using 50 cm diameter Bongo nets with 500µm mesh with a flowmeter to determine the filtered volume, were carried out to a maximum of 200m depth. The Superficial Equatorial Water, which had a salinity > 36 PSU and temperature > 20°C, occupied the top 80 to 200m depth. Below this water mass was the South Atlantic Central Water with salinity ranging from 34.5 to 36 PSU and temperature from 6 to 20°C. The community of chaetognaths showed six species: Pterosagitta draco, Flaccisagitta enflata, Flaccisagitta hexaptera, Pseudosagitta lyra, Serratosagitta serratodentata, and Sagitta helenae. Of these species, F. enflata was the most abundant (32.05% in 1997 and 42.18% in 1998) and the most frequent (87.88% in 1997 and 95% in 1998) during both periods. A mesopelagic specie was identified (P. lyra). This specie was more abundant in 1997 (3.42%), when the upwelling was more intense. P. lyra occurred in 22% of the samples during 1997. The abundance of F. enflata, an epiplanktonic species, increased, associated with greater water-column stability.

Sign in / Sign up

Export Citation Format

Share Document