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.

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 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.

scholarly journals Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil

2005 ◽  
Vol 48 (1) ◽  
pp. 139-145 ◽  
Author(s):  
Glaucia Dalabona ◽  
Jayme de Loyola e Silva ◽  
Marcelo Antonio Amaro Pinheiro
Keyword(s):  
Sexual Dimorphism ◽  
Sexual Maturity ◽  
Carapace Length ◽  
Carapace Width ◽  
Southern Brazil ◽  
Monthly Basis ◽  
Ucides Cordatus ◽  
Size At Sexual Maturity ◽  
Males And Females ◽  
One Year

Morphometry and maturity of Ucides cordatus were analyzed with males and females collected during one year on a monthly basis at Laranjeiras Bay, Paraná State, Brazil. Carapace length, chelipeds propodus length and abdominal width were measured and related to carapace width to verify sexual dimorphism and size at morphological maturity of each sex. Carapace and propodus length of larger and smaller cheliped presented difference between sexes, confirming the use of both as secondary sexual characters. MATURE II program indicated 44mm and 43mm of carapace width to represent the size at sexual maturity of males and females, respectively.

scholarly journals Relative growth of Acantholobulus schmitti (Rathbun, 1930) (Crustacea, Brachyura, Panopeidae) at Guaratuba Bay, southern Brazil

2013 ◽  
Vol 73 (4) ◽  
pp. 863-870 ◽  
Author(s):  
SF Frigotto ◽  
MZ Marochi ◽  
S Masunari
Keyword(s):  
Inflection Point ◽  
Carapace Width ◽  
Morphological Characteristics ◽  
Reproductive Period ◽  
Southern Brazil ◽  
Relative Growth ◽  
Left Handed ◽  
Sexually Mature ◽  
Major Cheliped ◽  
Female Abdomen

A study on the relative growth of the crab Acantholobulus schmitti (Rathbun, 1930) (Decapoda, Brachyura, Panopeidae) was performed with allometric techniques. The species is associated with lanterns used for oyster farming at Guaratuba Bay, southern Brazil. Crabs were obtained from five lanterns from March through December 2009. The following morphological characteristics were measured: the carapace width (CW), the height and length of the major cheliped propodus (LPH and LPL), the width of the female abdomen at the base of the 4th somite (AW) and the length of the male gonopod (GL). A total of 1,004 individuals of A. schmitti were measured, of which 451 were males, 323 non-ovigerous females and 230 ovigerous females. The CW of the males varied from 1.87 to 11.86 mm, that of non-ovigerous females from 1.44 to 8.77 mm and that of ovigerous females from 4.09 to 11.12 mm. The plot of LPH against CW showed a mean inflection point at 3.67 mm CW for the males. This result indicated that male crabs are juvenile below this value and adult above it. For the females, the corresponding inflection point occurred at 3.36 mm CW in the plot of AW against CW. These results, CW x LPH and CW x AW, highlight the importance of chelae enlargement at the onset of maturation in males. Similarly, the widening of the abdomen in females is required to accommodate egg clutches during the reproductive period. Heterochely was recorded in both sexes. Right-handed crabs were more frequent than left-handed ones, with percentages of 75.8% in males and 82.7% in females. The population of A. schmitti from Guaratuba Bay becomes sexually mature at an earlier age than A. schmitti from the coast of São Paulo state. The lanterns used in oyster farming furnish a safe habitat in which these crabs can spend their entire benthic life.

scholarly journals Período reprodutivo de Ucides cordatus (Linnaeus) (Brachyura, Ocypodidae) na Baía das Laranjeiras, sul do Brasil

2005 ◽  
Vol 34 ◽  
Author(s):  
GLAUCIA DALABONA ◽  
JAYME DE LOYOLA E SILVA
Keyword(s):  
Gonadal Development ◽  
Reproductive Period ◽  
Southern Brazil ◽  
Ucides Cordatus ◽  
Three Stages ◽  
Males And Females ◽  
One Year ◽  
Brazilian Northeast ◽  
Gonadal Condition

Análises macroscópica e microscópica das gônadas de Ucides cordatus foram realizadas mensalmente, durante um ano, visando determinar o período reprodutivo da espécie. A coleta dos espécimes foi realizada em duas ilhas no Sul do país, que apresentaram salinidades diferentes. Os dados obtidos apresentaram consonância com as informações existentes para a espécie no Nordeste brasileiro, possibilitando inferir que variações geográficas e em salinidade parecem não influenciar o período reprodutivo de U. cordatus. Para as fêmeas, foram identificados três estágios de desenvolvimento gonadal: em maturação, maturo e desovado. Fêmeas em maturação foram registradas de agosto a setembro, enquanto as maturas ocorreram de outubro a abril e as desovadas de dezembro a agosto. Os machos foram classificados em duas categorias: gônadas cheias, encontradas durante todo o período de estudo; e gônadas vazias, registradas de dezembro a abril. O contraste da condição gonadal dos machos e das fêmeas possibilitou a determinação do período reprodutivo da espécie na Baía das Laranjeiras, que ocorreu de dezembro a abril. Reproductive period of Ucides cordatus (Linnaeus) (Brachyura, Ocypodidae) in Laranjeiras Bay, southern Brazil Abstract Histological and macroscopic analyses of the gonads of Ucides cordatus were used to determine the reproductive period of the species. The specimens were collected monthly, during one year, in two islands located in the Laranjeiras Bay, Southern Brazil. The obtained data were similar for the two islands and they showed consonance with the information for the species in the Brazilian Northeast. Three stages of gonadal development were identified for the females: in maturation (registered from August to September), mature (registered from October to April) and spawned (registered from December to August). The males were classified in two categories: full gonads, found during the whole study period; and empty gonads, registered from December to April. The contrast of the gonadal condition between males and females allows to determine the reproductive period, which occurs from December to April in Laranjeiras Bay. Résumé Des analyses macroscopiques et microscopiques de Ucides cordatus ont été réalisées mensuellement pendant une année, em envisageant déterminer la période reproductive de l’espèce. La collecte des espècemenes a été réalisée em deux îles (Peças et Pavoçá) qui présentaient des salinités différentes. Les données obtenues ont presente consonance aux renseignements existants pour l’espéce du Nort-est brésilien em rendant possible infere que les variations geographiques et em salinité semblent ne pás influencer la ériode reproductive de U. cordatus. Pour lês femelles, ont été identifiés trois stages de développement dês gonades: en maturation, mature et frayé. Des femelles en maturation ont été enregistrées d’août à septembre, tandis que celles matures l’ont été d’octobre à avril et celles frayées de décembre à août. Les mâles ont été classés em deux catégories: gonades pleines trovées pendant toute la période d’étude,, et gonades vides, enregistrées de décembre à avril. Le contraste de la condition dês gonades des mâles et des femelles a rendu possible la détermination de la période reproductive de l’espèce dans la Baia das Laranjeiras, qui a eu lieu entre décembre et avril.

scholarly journals Method of capture and population structure of Aegla georginae Santos and Jara, 2013 (Decapoda: Anomura: Aeglidae) in a tributary of the Ibicuí River in southern Brazil

2016 ◽  
Vol 76 (4) ◽  
pp. 1035-1042 ◽  
Author(s):  
C. E. Copatti ◽  
R. P. Legramanti ◽  
A. Trevisan ◽  
S. Santos
Keyword(s):  
Population Dynamics ◽  
Population Structure ◽  
River Basin ◽  
Frequency Distribution ◽  
Relative Abundance ◽  
Carapace Length ◽  
Grouped Data ◽  
Southern Brazil ◽  
Size Classes ◽  
Males And Females

Abstract In the current study, we investigated population aspects of Aegla georginae in the Ibicuí River Basin by considering different capture methods and the implication of these data in the analysis of population dynamics. We sampled 1774 individuals: 1259 males (21 and 97 juveniles and 1029 and 113 adults in trap and handnet, respectively), 512 females (05 and 140 juveniles, 184 and 64 adults, and 81 and 38 ovigerous in trap and handnet, respectively) and 03 unsexed individuals (02 and 01 in trap and handnet, respectively). The frequency distribution in size classes shows a bimodal model for both sexes. The carapace length (CL) in males and females varied from 3.11 to 26.00 and 3.73 to 22.36 mm, respectively. Males presented significantly larger sizes than females. The relative abundance between males and females was significantly different from 1:1 with more males than females in most sampling periods (p < 0.05) when considering the grouped data (handnet + trap) and trap captures, but followed the expected ratio in most months when considering individuals sampled only with handnet (p > 0.05). Juveniles were recorded in all seasons, and reproduction occurs throughout the year. The population structure is similar to the model known for aeglids, and the capture methods affected the analysis of A. georginae, where the grouped data and trap captures presented greater abundance of individuals than handnet and males predominate in the larger size classes, and females in the intermediary size classes. Therefore, an integrated view of the capture methods is the best model for studying the population dynamics of aeglids.

scholarly journals Population Structure of The Mangrove Crab Ucides cordatus (Crustacea: Decapoda; Brachyura) in the Estuary of the Mamanguape River, Northeast Brazil.

2004 ◽  
Vol 32 (1) ◽  
Author(s):  
Rômulo Romeu Romeu da Nóbrega ALVES ◽  
Alberto Kioharu NISHIDA
Keyword(s):  
Population Structure ◽  
Mangrove Ecosystem ◽  
Management Plan ◽  
Human Populations ◽  
Northeast Brazil ◽  
Ucides Cordatus ◽  
Mangrove Ecosystems ◽  
Mangrove Crab ◽  
Low Dimension ◽  
The Mean

The crab Ucides cordatus (Linnaeus, 1763) or ‘caranguejo-uçá’, as it is known in Brazil, is one of the most conspicuous and abundant components of the epibenthic macrofauna of Brazilian mangrove ecosystems and the most exploited resource by riparian human populations. It is aimed here to study the population structure of this crustacean in the estuary of the Mamanguape river, State of Paraíba, Northeast Brazil. The research was performed between August 2000 and September 2001. An area of 1600m2 was marked out through the mangrove habitat and the density of U. cordatus was determined by counting inhabited burrows. Three-hundred crabs were captured and biometrical and sexual ratio values were obtained. The mean density of inhabited burrows was 1.7 burrows m-2. Males crabs were larger than females and their sexual ratio was 1.85: 1.00. They mate between January and March. The low dimension of captured specimens and the low values of population density here obtained confirm the observation of crab gatherers that ‘caranguejo-uçá’ is decreasing in that mangrove area. It is suggested the need for a management plan aiming a sustainable exploitation of this important food and profitable resource. Key words: Ucides cordatus ⋅ Leaf-consuming crab ⋅ Mangrove ecosystem ⋅ Northeast Brazil

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 structure and reproduction of Deuterodon langei travassos, 1957 (Teleostei, Characidae) in a neotropical stream basin from the Atlantic Forest, Southern Brazil

2008 ◽  
Vol 51 (6) ◽  
pp. 1187-1198 ◽  
Author(s):  
Jean Ricardo Simões Vitule ◽  
Marcelo Rennó Braga ◽  
José Marcelo Rocha Aranha
Keyword(s):  
Population Structure ◽  
Atlantic Forest ◽  
Reproductive Period ◽  
Time Interval ◽  
Short Time Interval ◽  
Southern Brazil ◽  
Downstream Site ◽  
Longitudinal Gradient ◽  
Wide Range ◽  
Neotropical Stream

Aspects of the biology of D. langei were studied at different sites along a longitudinal gradient formed by the Ribeirão stream basin, a Neotropical stream of the Atlantic Forest, southern Brazil. Differences were observed in population structure and reproduction along the longitudinal gradient and during the study period. Juvenile fishes occurred in high abundance, mainly in the downstream site after the rainy months. Adults occurred mainly in the intermediate and upstream sites. During their life cycle, adults optimise their reproductive strategy by concentrating the reproductive period with total spawn in a short time interval before summer rains dragged the juvenile, larval forms and/or eggs downstream. The downstream site was characterized by a wide range of microhabitats (ex. submerged grass and shallow flooded area). Thus, the species used different portions of the basin in distinct stages of its life, being ecologically adapted to variation patterns in its temporal and physical environments.

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