scholarly journals Duration of the pre-settlement period of the mangrove crab Ucides cordatus (Decapoda: Ocypodidae) under laboratory conditions

2008 ◽  
Vol 51 (5) ◽  
pp. 957-962 ◽  
Author(s):  
Robson Ventura ◽  
Ubiratã de Assis Teixeira da Silva ◽  
Gilmar Perbiche-Neves ◽  
Antonio Ostrensky ◽  
Walter Antonio Pereira Boeger ◽  
...  
Keyword(s):  
Juvenile Stage ◽  
Mangrove Sediment ◽  
Natural Environments ◽  
Ucides Cordatus ◽  
Settlement Period ◽  
Laboratory Conditions ◽  
Mangrove Crab

The goal of the present study was to determine the most appropriate time to release the immatures of Ucides cordatus (Linnaeus) produced in the laboratory into the natural environments. Specifically, the time when the megalopae sought the mangrove sediment to excavate the burrows was determined, as well as the time necessary for their metamorphosis into the first juvenile stage. Results indicated that the megalopae of U. cordatus reared in the laboratory took three to ten days (median = 6) after their molt to excavated burrows in the sediment. The average time for the megalopae to molt into juveniles was 12.6 days (SD = 2.3).

Larval cannibalism rates in the mangrove crab Ucides cordatus (Decapoda: Ocypodidae) under laboratory conditions

2008 ◽  
Vol 39 (3) ◽  
pp. 263-267 ◽  
Author(s):  
Robson Ventura ◽  
Ubiratã A T da Silva ◽  
Gilmar Perbiche-Neves ◽  
Antonio Ostrensky ◽  
Walter A Boeger ◽  
...  
Keyword(s):  
Ucides Cordatus ◽  
Laboratory Conditions ◽  
Mangrove Crab

scholarly journals Restocking Ucides cordatus (Decapoda: Ocypodidae): interespecific associations as a limiting factor to the survival of released recruits

2010 ◽  
Vol 58 (3) ◽  
pp. 207-212 ◽  
Author(s):  
Robson Ventura ◽  
Ubiratã A. T. da Silva ◽  
Kelly Cottens ◽  
Walter A Boeger ◽  
Antonio Ostrensky
Keyword(s):  
Mangrove Sediment ◽  
Limiting Factor ◽  
Natural Environments ◽  
Target Area ◽  
Preliminary Estimate ◽  
Natural Conditions ◽  
Fiddler Crabs ◽  
Ucides Cordatus ◽  
First Instar ◽  
Ecological Relationship

Simulations in the laboratory were used to investigate whether survivorship rates of Ucides cordatus youngsters produced in the laboratory are significantly affected by other crab species after their release in natural environments. Furthermore, it was investigated whether the release of first instar juveniles instead of megalopae would reduce the mortality related to interspecific predation. A preliminary estimate of the crab community structure in the target area of a restocking program was undertaken and indicated a great dominance of fiddler crabs (Uca spp). Based on this information, experiments were conducted to assess the ecological relationship between Ucides cordatus megalopae and first instar juveniles and fiddler crabs of different size classes in the presence of mangrove sediment, simulating natural conditions, as well as in the absence of any kind of refuge. It was observed that fiddler crabs not only compete with, and prey on U. cordatus youngsters, both as megalopae and juveniles. Furthermore, it was observed that the predation behavior of fiddler crabs is exercised only by individuals with carapaces wider than 0.5 cm. The results of the assay simulating natural conditions showed that, even when sediment was provided as a refuge, the same pattern was observed, with survivorship rates significantly lower in the presence of Uca crabs.

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.

Influence of seasonality on the natural modulation of oxidative stress biomarkers in mangrove crab Ucides cordatus (Brachyura, Ucididae)

2019 ◽  
Vol 227 ◽  
pp. 146-153 ◽  
Author(s):  
Carla Carolina Miranda dos Santos ◽  
Jorge Felippe Medeiros da Costa ◽  
Cléverson Rannieri Meira dos Santos ◽  
Lílian Lund Amado
Keyword(s):  
Oxidative Stress ◽  
Oxidative Stress Biomarkers ◽  
Ucides Cordatus ◽  
Stress Biomarkers ◽  
Mangrove Crab

Rearing of eight species of terrestrial gastropods (order Stylommatophora) under laboratory conditions

1985 ◽  
Vol 63 (10) ◽  
pp. 2474-2476 ◽  
Author(s):  
J. B. Gray ◽  
R. A. Kralka ◽  
W. M. Samuel
Keyword(s):  
Leaf Litter ◽  
Natural Environments ◽  
Deroceras Reticulatum ◽  
Terrestrial Gastropods ◽  
Laboratory Conditions

The snail Triodopsis multilineata (Say) and the slugs Deroceras laeve (Müller) and Deroceras reticulatum (Müller) were successfully reared using inorganic vermiculite as a substrate and carrots and lettuce as food. Discus cronkhitei (Newcomb), Vallonia gracilicosta Reinhardt, Vallonia pulchella (Müller), Vertigo gouldii (Binney), and Zonitoides arboreus (Say) were reared on various types of organic leaf-litter substrates that simulated their natural environments. Triodopsis multilineata was the gastropod most easily reared and maintained.

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.

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