Sexual maturity, handedness and sexual dimorphism of the freshwater crab Dilocarcinus pagei in Southeastern Brazil

The aim of the present study was to determine the size at sexual maturity in the freshwater crab Dilocarcinus pagei Stimpson, 1861, from a population located in Mendonça, state of São Paulo, Brazil. The crabs were sampled monthly (July 2005 to June 2007), at Barra Mansa reservoir. The specimens were captured manually or in sieves passed through the aquatic vegetation. The crabs were captured and separated by sex based on morphology of the pleon and on the number of pleopods. The following dimensions were measured: carapace width (CW); carapace length (CL); propodus length (PL); and abdomen width (AW). The morphological analysis of the gonads was used to identify and categorize individuals according to their stage of development. The morphological maturity was estimated based on the analysis of relative growth based on the allometric equation y = ax b. The gonadal maturity was based on the morphology of the gonads by the method CW50 which indicates the size at which 50% of the individuals in the population showed gonads morphologically mature to reproduction. The biometric relationships that best demonstrated the different patterns of growth for the juvenile and adult stages were CW vs. PL for males and CW vs. AW for females (p<0.001). Based on these relationships, the estimated value to morphological sexual maturity was 21.5 mm (CW) in males and 19.7 mm (CW) in females. The determination of the size at sexual maturity and the adjustment of the data based on the logistic curve (CW50) resulted in a size of 38.2 mm for males and 39.4 mm for females (CW). Based on the data obtained for sexual maturity for D. pagei, we can estimate a minimum size for capture of 40 mm (CW). This minimum size allows at least half of the population to reproduce and retains the juveniles and a portion of the adults in the population.

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Juvenile development of Dilocarcinus pagei Stimpson, 1861 (Brachyura, Trichodactylidae) reared in the laboratory, with emphasis on setae morphology

Crustaceana ◽

10.1163/15685403-00003247 ◽

2013 ◽

Vol 86 (13-14) ◽

pp. 1644-1663 ◽

Cited By ~ 3

Author(s):

Rony R. R. Vieira ◽

Paulo J. Rieger ◽

Viviane Cichowski ◽

Marcelo A. A. Pinheiro

Keyword(s):

Sexual Dimorphism ◽

Water Hyacinth ◽

Morphological Characters ◽

Juvenile Stage ◽

Freshwater Crab ◽

The Third ◽

Laboratory Conditions ◽

Juvenile Stages ◽

Juvenile Development ◽

Dilocarcinus Pagei

The juvenile development of the freshwater crab Dilocarcinus pagei Stimpson, 1861 was studied under laboratory conditions, focusing on setae morphology. The ovigerous females were collected manually associated with water hyacinth at the Municipal Dam of São José do Rio Preto (São Paulo, Brazil). The specimens were raised in the laboratory under constant aeration, photoperiod (12 : 12 h) and temperature (27 ± 1°C). Twelve juvenile stages were obtained with descriptions of the main morphological characters that allow their identification are presented. Fourteen types of setae were discovered: dentate, denticulate, serrulate, papposerrate, cuspidate, plumose, plumodenticulate, plumoserrulate, simple, pappose, brush, curved, nail and setules. The greatest diversity of setae was found on the mouth appendages, especially the maxillule. The gill ontogeny and sexual dimorphism becomes apparent from the second juvenile stage onwards. At the third juvenile stage, the carapace begins to exhibit a wider shape, becoming similar to that of the adults.

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Reproductive biology and feeding of Curimatella lepidura (Eigenmann & Eigenmann) (Pisces, Curimatidae) in Juramento reservoir, Minas Gerais, Brazil

Revista Brasileira de Zoologia ◽

10.1590/s0101-81752006000200002 ◽

2006 ◽

Vol 23 (2) ◽

pp. 314-322 ◽

Cited By ~ 24

Author(s):

Érika R. de Alvarenga ◽

Nilo Bazzoli ◽

Gilmar B. Santos ◽

Elizete Rizzo

Keyword(s):

Sexual Dimorphism ◽

Reproductive Biology ◽

Sexual Maturation ◽

Nutrient Recycling ◽

Reproductive Activity ◽

Feeding Habit ◽

Southeastern Brazil ◽

Short Rainy Season ◽

Probable Role ◽

Energetic Reserves

Reproductive biology and feeding of Curimatella lepidura (Eigenmann & Eigenmann, 1889) were studied in Juramento reservoir, São Francisco River basin, Southeastern Brazil. Histological analyses and gonadosomatic indexes revealed females and males in reproductive activity from October to March and total spawning occurring from January to March coupled with the peak of spermiating males. In the dry season, the fishes accumulated energetic reserves for reproduction during a short rainy season. The species presented sexual dimorphism, being females larger than males and sexual maturation occurring close to 7.7 cm standard length for females and 7.1 cm for males. C. lepidura presented iliophagous feeding habit, ingesting mainly sediment/detritus and a small amount of acari, algae, Tricoptera insects and Ostracoda crustaceans, suggesting a probable role in nutrient recycling of the Juramento reservoir.

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Relative growth and sexual maturity of the stone crab Menippe nodifrons Stimpson, 1859 (Brachyura, Xanthoidea) in southeastern Brazil

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89132007000200011 ◽

2007 ◽

Vol 50 (2) ◽

pp. 259-267 ◽

Cited By ~ 11

Author(s):

Giovana Bertini ◽

Adriane Araújo Braga ◽

Adilson Fransozo ◽

Michéle de Oliveira Dias Alves Corrêa ◽

Fulvio Aurélio de Morais Freire

Keyword(s):

Sexual Maturity ◽

Carapace Width ◽

Southeastern Brazil ◽

Positive Allometry ◽

Relative Growth ◽

Stone Crab

The relative growth and size at onset of morphological sexual maturity of the stone crab Menippe nodifrons were investigated. A total of 399 crabs was captured on Praia Grande and Tenório beaches at Ubatuba. Carapace width (CW) and length, cheliped propodus length and height, abdomen width in females, and gonopod length in males were recorded. In females, the abdominal width showed negative allometry for juveniles and positive allometry for adults; the puberty molt occurred at 31.6 mm CW. In males, the size at onset of morphological sexual maturity was estimated as 29.7 mm CW; the gonopod growth showed positive allometry for juveniles, and an isometric relationship for adults. The gonopod length and the abdominal width were the most appropriate morphometric variables to estimate size at onset of sexual maturity in this stone crab.

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Reproductive Cycle, Size and Age at Sexual Maturity, and Sexual Dimorphism in the Stream-Breeding Frog Crossodactylus schmidti (Hylodidae)

South American Journal of Herpetology ◽

10.2994/sajh-d-17-00060.1 ◽

2019 ◽

Vol 14 (1) ◽

pp. 1 ◽

Cited By ~ 2

Author(s):

Vinícius Matheus Caldart ◽

Luiza Loebens ◽

Amanda Jamile Carvalho Brum ◽

Lívia Bataioli ◽

Sonia Zanini Cechin

Keyword(s):

Sexual Dimorphism ◽

Reproductive Cycle ◽

Sexual Maturity

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Morphology of the franciscana (Pontoporia blainvillei) off southeastern Brazil: sexual dimorphism, growth and geographic variation

Latin American Journal of Aquatic Mammals ◽

10.5597/lajam00017 ◽

2002 ◽

Vol 1 (1) ◽

Cited By ~ 9

Author(s):

R. M. A. Ramos ◽

A. P. M. Di Beneditto ◽

S. Siciliano ◽

M. C. O. Santos ◽

A. N. Zerbini ◽

...

Keyword(s):

Sexual Dimorphism ◽

Geographic Variation ◽

Southeastern Brazil ◽

Pontoporia Blainvillei

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Body size, female reproduction and sexual dimorphism in the lizard Ameiva ameiva (Teiidae) in a restinga of southeastern Brazil

Revista Brasileira de Zoologia ◽

10.1590/s0101-81752008000200024 ◽

2008 ◽

Vol 25 (2) ◽

pp. 370-372 ◽

Cited By ~ 6

Author(s):

Carlos Frederico Duarte Rocha

Keyword(s):

Body Size ◽

Sexual Dimorphism ◽

Clutch Size ◽

Reproductive Period ◽

Southeastern Brazil ◽

Head Width ◽

Sexually Dimorphic ◽

Female Reproduction ◽

Female Body Size ◽

Reproductive Body

In this study 57 specimens of the lizard Ameiva ameiva (Linnaeus, 1758) collected in the restinga at Barra de Maricá, in the state of Rio de Janeiro, southeastern Brazil, were analyzed to investigate size relations and reproduction (in females) and sexual dimorphism of this population. We answered the following questions: 1) what is the minimum reproductive body size in females? 2) what is the average clutch size and 3) how is clutch size related to body size? 4) Are body and head sizes sexually dimorphic? Mean clutch size was 6.7 ± 2.1 eggs and was positively correlated with female body size. Sexual dimorphism favoring males was found: adult mean snout-vent length was great in males (124.2 ± 17.8 mm) than females (96.5 ± 23.1 mm SVL), and males were larger with respect to head width and length, and body mass. Thus, despite the marked seasonality at Barra de Maricá, A. ameiva has an extended reproductive period. Also, intrasexual selection may have acted on females to produce larger clutches, and on males, favoring larger males.

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Reproductive biology of a tetragonopterinae (osteichthyes, characidae) of the Ubatiba fluvial system, Maricá - RJ

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89131999000400011 ◽

1999 ◽

Vol 42 (4) ◽

Cited By ~ 18

Author(s):

Rosana Mazzoni ◽

Jaqueline Petito

Keyword(s):

Sexual Dimorphism ◽

Reproductive Biology ◽

Sexual Maturity ◽

Gonadosomatic Index ◽

Oocyte Diameter ◽

Fluvial System ◽

Development Stages ◽

Maturation Stages ◽

Mean Size ◽

Reproduction Period

Aspects of the reproductive biology of one Tetragonopterinae was assessed in the Ubatiba river - Maricá / RJ. Length structure and mean size suggested sexual dimorphism, females reaching larger sizes than males. The onset of sexual maturity occured at 2.8cm for both the sexes. Fecundity, determined on ripe ovaries, showed positive correlation to females size and weight and varied from 595 to 5520 for 3.9cm and 6.2cm lengths respectively. The spawning type, defined as total, was determined by the oocyte diameter frequency from ovaries in different development stages. The frequency distribution of ovarian/testis maturation stages, associated with the temporal variation of the gonadosomatic index, suggested that the reproduction period was prolonged along the whole annual cycle.

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