scholarly journals Bioecology of the crab Ucides cordatus (Crustacea, Decapoda) in mangroves influenced by the Amazon River, Brazil

2014 ◽  
Vol 44 (2) ◽  
pp. 213-222 ◽  
Author(s):  
Kárlia Dalla Santa Amaral ◽  
Inácia Maria Vieira ◽  
Frederico Moreira Osório ◽  
Joana D'arc Mauricio Rocha ◽  
Jô de Farias Lima
Keyword(s):  
Stage Iv ◽  
Reproductive Period ◽  
Maturation Stage ◽  
Brazilian Coast ◽  
Linear Measurements ◽  
Fishery Resource ◽  
Female Ratio ◽  
Ucides Cordatus ◽  
Mangrove Crab ◽  
Significant Difference

The mangrove crab (Ucides cordatus) is a valuable fishery resource, overfished along the Brazilian coast. This study aimed to obtain bioecological data on this crab along the coast of the State of Amapá. Six bimonthly samplings were conducted between December 2008 and January 2010. Transects were used to estimate the density (burrows m-2) and population abundance (individuals m-2). All the animals were subjected to biometrics, with females being classified according to their stage of gonadal maturation. The mean density (1.09 burrows m-2) and abundance (0.31 individuals m-2) were influenced by the climate with the highest values in summer (1.17 burrows m-2 and 0.34 individuals m-2). The male to female ratio was 1.38:1 showing significant difference in the proportion of sexes. The individuals showed sexual dimorphism, with linear measurements significantly higher in males. The sampled animals also had larger carapace length and width (CL and CW) compared to crabs studied in other Brazilian states. There was a positive relationship between CW and CL and individual weight (IW) and CW for males (R² = 0.83 and 0.90) and females (R² = 0.79 and 0.84). The growth was negative allometric (CL increases to a lesser extent than CW) for both sexes. The highest frequency of ovigerous females (78%) and in maturation stage IV (38%) occurred in the CW size class between 59.8 and 67.5 mm. The peak of mature females occurred in May and August, showing a reproductive period different from those in other Brazilian states.

scholarly journals Population connectivity and larval dispersal of the exploited mangrove crab Ucides cordatus along the Brazilian coast

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4702 ◽  
Author(s):  
Fábio B. Britto ◽  
Anders J. Schmidt ◽  
Adriana M.F. Carvalho ◽  
Carolina C.M.P. Vasconcelos ◽  
Antonia M. Farias ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Gene Flow ◽  
Population Connectivity ◽  
Brazilian Coast ◽  
Fishery Resource ◽  
Ucides Cordatus ◽  
Migration Rates ◽  
Mangrove Crab ◽  
Key Species

Background The mangrove crab Ucides cordatus is considered a key species for the ecological balance of mangrove forests and a major source of employment and income for traditional crab collectors in Brazil. Several studies evidenced weak genetic variation among populations due to an efficient larval transport. However, gene flow patterns of the species is poorly understood, with no information about migration rates. The influence of the two main Brazilian currents in larval dispersion is also not clear. In order to provide baseline information for conservation, planning and management of this important fishery resource, the present study aimed to estimate and evaluate spatial distribution of genetic diversity, migration rates and gene flow directivity among populations of U. cordatus in Brazil. Methods Nine microsatellites were used to resolve population structure of 319 crabs collected from six sites located along the Brazilian coast. The degree of geographical differentiation included estimates of genetic diversity, population structure and gene flow models, with spatial analysis of shared alleles (SAShA), isolation by distance tests, AMOVA, discriminant analysis of principal components (DAPC) and Bayesian clustering. We estimated the amount of ongoing gene flow between clusters using the coalescent-based method implemented in Migrate-N. Results Loci were highly polymorphic (average of 12.4 alleles per locus) evidencing high genetic variability. There was significant differentiation among localities, despite of the low value of FST (= 0.019; P < 0.001). FST and Jost’s D indexes were also estimated in pairwise comparisons and showed significant differences between most of the surveyed site pairs (P < 0.05). Structure evidenced a single genetic group among samples, however SAShA pointed to a non-panmictic condition (P = 0.011). AMOVA detected four statistical significant clusters with low level of differentiation (FCT = 0.037; P = 0.023). The gene flow model that best described the population connectivity was the island model, with ∼24 crabs being exchanged among localities per generation. Discussion The high migration rates found among localities seem to be the main force acting to sustain the distribution of the genetic diversity of U. cordatus. Despite the high gene flow and the weak population structure among samples, the significant genetic differences found suggest that gene flow alone does not bypass the effects of genetic drift, natural selection and/or human exploitation. These findings are vital for the establishment of a database to be used in the development of conservation programs.

Temporal variation in the weight-size relationship of the mangrove crab Ucides cordatus L. (Decapoda: Ucididae) in relation to its life cycle phases

2014 ◽  
Vol 64 (4) ◽  
pp. 333-342 ◽  
Author(s):  
Marcos de Miranda Leão Leite ◽  
Cynthia Yuri Ogawa ◽  
Carla Ferreira Rezende ◽  
José Roberto Feitosa Silva
Keyword(s):  
Life Cycle ◽  
Condition Factor ◽  
River Estuary ◽  
Total Weight ◽  
Northeastern Brazil ◽  
Annual Life Cycle ◽  
Ucides Cordatus ◽  
Mangrove Crab ◽  
Significant Difference ◽  
The Relationship

The relationship between weight and size of individuals can be used to evaluate the status of a population, which is particularly useful for natural populations that are being exploited. Ucides cordatus occurs on the Atlantic coast of the American continent, from Florida (USA) to Santa Catarina (Brazil). This species is economically very important, most of all in the Northeastern area of Brazil, as well as in the Dominican Republic and Suriname. The objective of this study was to analyze life phases (‘fattening’, ‘matumba’, ‘milk-crab’, ‘maturation’ and ‘walking’) by use of the weight-length relationships, as well as temporal variations in this condition factor for each sex of U. cordatus. For this purpose, individuals were sampled monthly for twenty-four months at the Jaguaribe River estuary, Ceará State, Northeastern Brazil. The relationship between total weight and cephalothorax width was established using regression analysis, adjusted by a power equation. The dynamics of the condition factor were analyzed for each sex using the variation of its averages related to annual life cycle; this was done for each of the previously-mentioned phases. The relationship between total weight and cephalothorax width showed an isometric growth in males and negative allometric growth in females suggesting that, for the same reference size, males are heavier than females. When considering the average of the female condition factors, these were greater than those for males during the annual life cycle, except during the ‘maturation’ phase, which is the phase with a higher demand of energetic reserves for males. Annual variation of the condition factor in females presented no significant difference.

Population structure of Sinelobus cf. stanfordi (Crustacea, Tanaidacea) from Pinheiros River mangrove, Guaratuba Bay, southern Brazil

2016 ◽  
Vol 97 (2) ◽  
pp. 243-247
Author(s):  
A. D. Kassuga ◽  
A. Marafon-Almeida ◽  
S. Masunari
Keyword(s):  
Population Structure ◽  
Carapace Length ◽  
Reproductive Period ◽  
Southern Brazil ◽  
Ucides Cordatus ◽  
Temporal Fluctuations ◽  
Mangrove Crab ◽  
Sexually Mature

An analysis of the population structure of the tanaid Sinelobus cf. stanfordi was performed at Pinheiros River mangrove, Guaratuba Bay, Paraná State, southern Brazil (25°49′S 48°34′W). Fifteen samples of 12 × 12 cm were obtained bimonthly from the surface of galleries (interconnected burrow complex) constructed by the adult mangrove crab Ucides cordatus from June 2007 to April 2008. The carapace length (CL) of a total of 714 tanaids was measured. Tanaids were divided into four demographic categories: males (M), ovigerous females (OV), preparatory females (PREP) and non-reproductive individuals (NREP) with a mean CL of 0.55, 0.49, 0.48 and 0.43 mm, respectively. In the NREP group, specimens smaller than 0.32 mm were classified as juveniles. NREP predominated in all sampling months, and among sexually mature individuals, a strong predominance of females was observed throughout the study period. Temporal fluctuations in abundance were observed, with a peak in August 2007. The reproductive period of this species is continuous, with a peak in the summer, like most S. cf. stanfordi populations.

Multivariate analysis of factors affecting overall survival in minority-based population of young colorectal cancer patients: A single-institution experience.

2012 ◽  
Vol 30 (15_suppl) ◽  
pp. e14186-e14186
Author(s):  
Shivi Jain ◽  
Kireet Agrawal ◽  
Shinoj Pattali ◽  
Abhijai Singh ◽  
Kamal Agrawal ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Overall Survival ◽  
Multivariate Analysis ◽  
Family History ◽  
Cancer Patients ◽  
Stage Iv ◽  
Female Ratio ◽  
Stage Iv Colorectal Cancer ◽  
Significant Difference ◽  
Colorectal Cancer Patients

e14186 Background: Overall survival in colorectal cancer is influenced by obesity, age, gender and stage at diagnosis. However, in minority based populations, effect of the above factors on overall survival has not been studied in any detail. Hence, we undertook this retrospective study to evaluate effect of above factors on overall survival in young colorectal cancer patients. Methods: 1,195 subjects with colorectal cancer treated at John H. Stroger Hospital of Cook County between 2000 and 2008 were retrospectively analyzed. 179 subjects with age 50 years and younger were identified. 146 of 179 subjects with available Body Mass Index (BMI) in kg/m2 were included in the study. Effect of BMI, age, sex, race, LDH and CEA levels, stage, site of tumor, smoking and family history on overall survival was evaluated using standard statistical multivariate analysis. Results: In our population, 22 of 146(15%) were underweight (BMI<20), 56 of 146(38.4%) were normal weight (BMI 20-24.9), 46 of 146(31.5%) were overweight (BMI 25-29.9) and 22 of 146(15%) were obese (BMI >30). Male: female ratio was 1.4:1. 75 of 146(51.7%) were African American, 23 of 146(15.9%) were Caucasians. 50 of 146(34.2%) were stage IV colorectal cancer at diagnosis. On univariate analysis, BMI<20(p=0.031, HR 2.1, 95% CI 1.15-3.82), CEA >4ng/ml (p=0.005, HR 1.93, 95% CI 1.21-3.08) and stage IV colorectal cancer (p<0.001, HR 6.1, 95% CI 2.42-15.53) were significantly associated with decreased overall survival. LDH<200 U/L was significantly associated with improved overall survival (p 0.029, HR 0.6, 95% CI 0.391-0.950). On multivariate analysis, stage IV colorectal cancer was a single significant independent predictor of overall survival (p=0.001, 95% CI 2.47-27.78). CEA>4ng/ml was marginally significant for decreased overall survival (p=0.06, 95% CI 0.978-3.015). On the contrary, no statistically significant difference was found on overall survival with age, BMI>20, gender, race, tumor location, smoking and family history. Conclusions: Advanced stage and CEA >4ng/ml are independent prognostic variables for decreased overall survival in minority based population of young colorectal cancer.

scholarly journals Fishery of the Uçá Crab Ucides Cordatus (Linnaeus, 1763) in a Mangrove Area in Cananéia, State of São Paulo, Brazil: Fishery Performance, Exploitation Patterns and Factors Affecting the Catches

2014 ◽  
Vol 62 (3) ◽  
pp. 187-199 ◽  
Author(s):  
Luis Felipe de Almeida Duarte ◽  
Ricardo Santos Duran ◽  
Jocemar Tomasino Mendonça ◽  
Marcelo Antonio Amaro Pinheiro
Keyword(s):  
Carapace Width ◽  
Sao Paulo ◽  
Reproductive Period ◽  
General View ◽  
Lunar Phase ◽  
São Paulo ◽  
Catch Per Unit Effort ◽  
Ucides Cordatus ◽  
Mangrove Crab ◽  
Fishery Data

The fishery of the mangrove crab (Ucides cordatus) is one of the oldest sources of food, income and extractive activity in the estuarine systems of Brazil. The state of São Paulo has the largest population of any Brazilian state, and the city of Cananéia, in the Brazilian southeast has the highest recorded level of exploitation of the uçá-crab. Since 1990, this species has been under intense exploitation pressure due to the unauthorized use of a type of trap called 'redinha'. This type of fishing gear is considered harmful and is prohibited by Brazilian law, although its use is very common throughout the country. This study aims to evaluate the exploitation patterns of U. cordatus based on landing data and monitoring of the crab fishermen to verify the population structure of the crab stock and to identify the factors that influence the catches. A general view of the sustainability of the fishery for this resource is also provided for five defined mangrove sectors (areas A to E) at Cananéia. For this purpose, fishery data were recorded during 2009-2010 by the Instituto de Pesca (APTA/SAA-SP), and monitoring of the capture procedures used by two fishermen was conducted to obtain biometry data (CW, carapace width) and gender data for the captured crabs. The redinha trap was very efficient (86.4%) and produced sustainable catches because the trapped crabs were legal-sized males (CW>60 mm), although some traps are lost or remain in the mangrove swamps and can cause pollution by introducing plastic debris. The fishery data were evaluated with a General Linear Model (GLM) based on six factors: the characteristics of the crab fishermen, the time of capture (by month and year), the lunar phase, the productive sector and the reproductive period. The individual crab fishermen's empirical knowledge, the year of capture and the productive sector were the strongest influences on the crab catch per unit effort (CPUE). Differing extraction patterns were found in the five sectors examined in the Cananéia estuary. These findings underscore the need for a reassessment of the prohibition of the trap's use, raising discussion as to its possible construction with biodegradable materials, thus ensuring profitable and sustainable catches through a local participatory management process.

scholarly journals Orientation and external morphology of burrows of the mangrove crab Ucides cordatus (Crustacea: Brachyura: Ucididae)

2009 ◽  
Vol 89 (6) ◽  
pp. 1117-1123 ◽  
Author(s):  
Camila M.H. dos Santos ◽  
Marcelo A.A. Pinheiro ◽  
Gustavo Y. Hattori
Keyword(s):  
Larval Dispersal ◽  
Developmental Stages ◽  
External Morphology ◽  
Laguncularia Racemosa ◽  
Mangrove Forests ◽  
Differential Growth ◽  
Ucides Cordatus ◽  
Mangrove Crab ◽  
Significant Difference

The aim of the present study was to characterize the external morphology and the orientation of burrows constructed by the mangrove crab Ucides cordatus. Data were obtained from two mangrove forests of similar vegetation dominance (Laguncularia racemosa) but differing in flooding heights. These mangroves were located near Barra de Icapara, Iguape City (SP), Brazil, (24°50′36″S–47°59′53′W). A total of 221 burrows were examined (120 on the high mangrove and 101 on the low mangrove). External morphology of the burrows was recorded by photographs for categorization and description. The directions of the burrow openings were recorded using a geological compass and the declivities of the ducts were measured with a clinometer. Females constructed 70.8% at Site A and 69.4% at Site B of the occupied burrows with the opening facing the margin of the river (P < 0.001), whilst males showed no significant difference in the burrow orientation (P > 0.05) at either site. In females, the tendency for burrow orientation possibly has a reproductive connotation as larval dispersal may be favoured and enhanced by the tides. Four groups of distinct tracks related to the morphotypes and developmental stages of U. cordatus were observed. No sediment constructions associated with the burrows were recorded for this species. Declivity of the burrows from juveniles was lower than from adults (P < 0.05), probably caused by the differential growth of the chelipeds in this species.

scholarly journals Health State, morphological characterization and biometric parameters in the mangrove crab Ucides cordatus Linnaeus, 1763 (Brachyura: Ocypodidae)

2020 ◽  
Vol 42 ◽  
pp. e47430
Author(s):  
Pedro Alexandre Valentim-Neto ◽  
Tereza Cristina Vasconcelos Gesteira
Keyword(s):  
Rainy Season ◽  
Suspended Solids ◽  
River Estuary ◽  
Environmental Parameters ◽  
Opportunistic Pathogen ◽  
Abnormal Behavior ◽  
Health State ◽  
Ucides Cordatus ◽  
Mangrove Crab ◽  
Significant Difference

The crab Ucides cordatus is an important feature of mangroves in the North and Northeast of Brazil. In 2002 a large mortality was reported on this species in the Jaguaribe River Estuary. In order to investigate the possible causes specimens were collected monthly between May 2002 and December 2003 at five sites: Fortim (E1), Fortim (E2), Cumbe (E3) Aracati (E4) and Guajiru (E5). The mangrove structure and environmental parameters (salinity, pH, temperature and DO) were also evaluated. Water was collected for suspended solids analysis, BOD and nutrient levels. Salinity decreased in the rainy season, with no significant variation of pH and temperature. Dissolved oxygen levels had a mean of 5.7 mg L-1. Suspended solids increased at site E4, with BOD varying at E1 and E2 during the dry season. The same was observed at sites E1, E2 and E3 during the rainy season. Ammonia levels at E1 and E2 and phosphorus in all seasons, increased with rain events. Four lines of investigation were adopted: biometry, histology, hematology, and bioassay. There was no significant difference between animals in biometrics and histology showed no cellular alterations. However, hematology showed a significant difference between the E1 and E3 sites due to depletion in the number of hemocytes in E1, probably in response to environmental impacts. This can lead to poor immunity, leading to opportunistic pathogen infections such as viruses, bacteria and fungi. The bioassay showing no abnormal behavior or mortality. The structure the of mangrove was developed in all areas, except in E5 which served as a control site, with significant environmental stress with high levels of herbivorous growth (> 50%) and a salinity of around 50 ‰. It is believed that the mortality of the crabs was an occasional occurrence, probably due to toxin production by some fungal organism.

scholarly journals Growth and reproduction of the mangrove crab Goniopsis cruentata (Latreille, 1803) (Crustacea: Decapoda: Grapsidae) in southeastern Brazil

2015 ◽  
Vol 87 (2) ◽  
pp. 699-711 ◽  
Author(s):  
Carla R.G. Reis ◽  
Fabiano G. Taddei ◽  
Valter J. Cobo
Keyword(s):  
Developmental Stages ◽  
Carapace Width ◽  
Age At Onset ◽  
Growth Curves ◽  
Southeastern Brazil ◽  
Brazilian Coast ◽  
Fishery Resource ◽  
Relative Growth ◽  
Weight Growth ◽  
Mangrove Crab

Goniopsis cruentata is a common semi-terrestrial crab in Brazilian mangroves and an important fishery resource for traditional communities in the northeastern Brazilian coast. Aiming to contribute to the knowledge about the species, this study evaluated the carapace width and weight growth curves, the relative growth of weight versus carapace width, and the temporal variation of gonadosomatic and hepatosomatic indices for the species. A total of 524 crabs were collected in a mangrove area of Ubatuba municipality, state of São Paulo. The growth-curves parameters and longevity (tmax) were estimated for males (CW∞=50.6 mm, WE=56.4 g, k=2.24, t0=0.003631502 year-1, tmax=1.3 years) and females (CW∞=50.7 mm, WE∞=58.8 g, k=2.50, t0=0.003247209 year-1, tmax=1.2 years). The age at onset of sexual maturity was 0.23 years for both genders. The weight-growth model was isometric for the immature developmental stages and allometric negative for adults. The species exhibited a continuous reproduction, with breeding peaks in spring and summer months. The weight dynamics of gonads and hepatopancreas were not clearly related. The growth and reproductive patterns indicated that Goniopsis cruentata has a life-history that prioritizes reproduction instead of survival. The species exhibited some of the highest growth rates and lowest longevity estimates reported for brachyuran species in Brazil.

Epidemiology and outcome of sarcomatoid renal cell cancer compared to clear cell renal cancer: A Surveillance, Epidemiology, and End Results (SEER) database review.

2014 ◽  
Vol 32 (4_suppl) ◽  
pp. 504-504 ◽  
Author(s):  
Mohammed Nawaf Kanaan ◽  
Parminder Singh ◽  
Frederick R. Ahmann ◽  
Amit Balkrishna Agarwal
Keyword(s):  
Renal Cell ◽  
Cell Cancer ◽  
Case Series ◽  
Stage Iv ◽  
Stage I ◽  
Stage Ii ◽  
Main Stage ◽  
Seer Database ◽  
Female Ratio ◽  
Significant Difference

504 Background: Sarcomatoid renal cell carcinoma (SRCCa) is a rare type of RCCa. Few case series in literature indicated its dismal prognosis. We studied the epidemiology and survival outcome of SRCCa compared to clear RCCa (CRCCa) by reviewing the SEER database. Methods: SEER database (8.1.2) was reviewed for patients (pts) with histologically confirmed SRCCa and CRCCa between 2004 -2007. Variables included were: age, race, gender, laterality, surgery of primary RCCa and AJCC stage. Primary outcome was 3 year Disease Specific Survival (DSS). Data was analyzed using Chi square, Kaplan Meier and Cox proportional hazard model. Results: A total of 7,653 pts with CRCCa and 540 with SRCCa were included between 2004 and 2007. Mean age in SRCCa was 61 compared to 62 yrs in CRCCa. White to black race ratio was 7.5:1 in both types. Left primary was 54% in SRCCa and 51% in CRCCa. Male to female ratio was 1.9:1 in SRCCa and 1.7:1 in CRCCa (Table). The main stage at presentation was stage IV (63%) in SRCCa and stage I (53%) in CRCCa. Surgery rate was higher in SRCCa in stage II and IV, same between two groups in stage II and higher in CRCCa in stage I. When we analyzed the effect of RCCa type on DSS for each stage separately, SRCCa had worse 3-year DSS in stage I, II, III and IV independent of age, sex, race, gender and surgery. The Hazard Ratio was 4.97 for stage I, 11.37 for stage II, 3.91 for stage III and 1.58 for stage IV (p <0.001). Conclusions: SRCCa have no statistical significant difference in age, race, gender and laterality compared to CRCCa. When compared stage to stage, SRCCa have worse outcome than RCCa even after adjusting for potential confounders including age, race, gender and surgery. The effect appears to be less prominent in higher stages than in lower stages of the disease. [Table: see text]

scholarly journals Contamination in newly hatched larvae of the mangrove crab Ucides cordatus and a new perspective about trace elements transport

2021 ◽  
Vol 35 (1) ◽  
pp. 39-55
Author(s):  
Eduardo Almeida ◽  
Vinícius Kütter ◽  
Emmanoel Silva-Filho
Keyword(s):  
Trace Elements ◽  
Dry Weight ◽  
Southeastern Brazil ◽  
Important Species ◽  
Ucides Cordatus ◽  
Mangrove Crab ◽  
Significant Difference ◽  
Order Of Magnitude ◽  
Newly Hatched Larvae ◽  
New Perspective

Mangroves are relevant ecosystems due to their ecological role, economic use, and social importance. One of the most abundant and important species in Brazilian mangroves is the exploited crab Ucides cordatus. This study focuses on this species and the aim was to evaluate the concentration of trace elements in the hepatopancreas of ovigerous females, eggs (pre-hatching and hatching stages), and for the first time, in newly hatched larvae. Ovigerous females were captured in two Southeastern Brazil mangroves (Guanabara Bay and Paraíba do Sul River’s secondary estuary) and spawning was held in spawning tanks, in the laboratory. Some females were not taken to the tanks, but they were frozen right after collection. There was no significant difference in trace element concentration between these females and those kept in the spawning tanks. Both essential and non-essential trace elements were detected in newly hatched larvae. Comparing with the adult female, the elements Zn, Cu, and Mn showed the highest concentrations in larvae and eggs. Vanadium, Cr, and Mn concentrations were significantly higher in hatching eggs than observed in newly hatched larvae, indicating the retention of elements in the eggshell. Considering the V (0.17 - 1.17 μg.g−1 dry weight), Cu (14.1 - 41.1 μg.g−1 dry weight), and Zn (235.4 - 263.9 μg.g−1 dry weight) concentrations in newly hatched larvae, with the same order of magnitude observed in suspended particulate matter (SPM) and sediments in suspension, the planktonic larval dispersion could result in the transport of elements beyond the mangrove, and their introduction in coastal waters.

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