Análise comparativa entre a fecundidade de Dilocarcinus pagei Stimpson e Sylviocarcinus australis Magalhães &amp; Turkay (Crustacea, Decapoda, Trichodactylidae) no Pantanal do Rio Paraguai, Porto Murtinho, Mato Grosso do Sul

Mansur, Cynthia de Barros; Hebling, Nilton José

doi:10.1590/s0101-81752002000300018

Cited by 25 publications

(37 citation statements)

References 7 publications

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“…Both the absence of published information on female reproduction and the low number of females with eggs or juveniles in the collections analyzed by us suggest that those females are even more difficult to collect than males or females without eggs. In accordance with this conclusion, MANSUR & HEBLING (2002), studying the reproduc- The mean size of the juveniles from the two female K. latifrons was 4.92 ± 0.390 mm CW. In the case of K. ytupora, two cohorts of juveniles were detected (Fig.…”

Section: Discussionsupporting

confidence: 62%

“…I), typical for species with an abbreviated or direct development (MCEDWARD 1997). To the best of our knowledge, the only published information on fecundity in neotropical freshwater crabs is of Dilocarcinus pagei and Silviocarcinus australis (Trichodactylidae) from Brazil (MANSUR & HEBLING 2002): these crab species produced on average slightly more eggs (214 and 170, respectively; Tab. I) than the two Kingsleya species studied herein.…”

Section: Juveniles Of K Ytuporamentioning

confidence: 99%

“…However, most studies did not consider the developmental stage of the eggs, which impedes a comparison of the published values: egg size in decapods tends to increase during the incubation period (WEHRTMANN & KATTNER 1998, YAMAGUCHI 2001, WEHRTMANN & LÓPEZ 2003, PAVANELLI et al 2008, and this increase is typically related to the incorporation of large amounts of water (PANDIAN 1970). In contrast, MANSUR & HEBLING (2002) mentioned that the egg diameter of D. pagei and S. australis did not vary during embryogenesis. The present results, although based on only few observations of eggs in different developmental stages, indicate a substantial increase of both egg diameter and egg volume (Tab.…”

Section: Juveniles Of K Ytuporamentioning

confidence: 99%

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Offspring production in three freshwater crab species (Brachyura: Pseudothelphusidae) from the Amazon region and Central America

Wehrtmann¹,

Magalhães²,

Hernáez³

et al. 2010

Zoologia (Curitiba, Impr.)

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Freshwater crabs are an important component of the fauna of limnic environments, and out of the two true freshwater crab families present in the Neotropics, Pseudothelphusidae is the most diverse. Considering the lack of information regarding reproductive features of neotropical freshwater crabs, we studied, for the first time, the fecundity and the presence of juveniles carried by females of two pseudothelphusids from the Amazon region - Kingsleya latifrons (Randall, 1840) and Kingsleya ytupora Magalhães, 1986 - and one from Central America - Potamocarcinus magnus (Rathbun, 1896). The two Kingsleya species produced relatively few (56-114) and large eggs (1.9-3.7 mm), typical for species with an abbreviated or direct development. Recently produced eggs were substantially larger in K. latifrons (mean 2.83 mm) when compared to those of K. ytupora (mean 1.87 mm); however, at the end of the embryogenesis, mean egg diameter was similar in both species. Therefore, it is assumed that hatchlings in both species should have a similar size. A brief description of attached juveniles of K. ytupora is provided. The number of juveniles varied between 30 (K. ytupora) and 179 (P. magnus); two size groups of juveniles were found, which indicates that the offspring cling to their mother for a prolonged period of time. There was no significant loss of eggs and juveniles; it is assumed that parental care diminishes the loss of their offspring. We compiled the available information of reproductive aspects from freshwater crabs: egg diameter was in the range of 2-3 mm, independent of female size and fecundity, and reported egg number varied between 9 and 417 eggs

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Section: Discussionsupporting

confidence: 62%

Section: Juveniles Of K Ytuporamentioning

confidence: 99%

Section: Juveniles Of K Ytuporamentioning

confidence: 99%

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Offspring production in three freshwater crab species (Brachyura: Pseudothelphusidae) from the Amazon region and Central America

Wehrtmann¹,

Magalhães²,

Hernáez³

et al. 2010

Zoologia (Curitiba, Impr.)

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“…Some these studies include analyses of reproduction (Liu & Li, 2000), fecundity (Mansur & Hebling, 2002), investigations about distribution (Magalhães et al, 2005), physiological topics (Onken & McNamara, 2002;Amado et al, 2006), development (Pinheiro & Taddei, 2005a,b;Mansur et al, 2005;Taddei & Herrera, 2010) and population dynamics (Davanso et al, 2013).…”

mentioning

confidence: 99%

“…Hartnoll (1974) All individuals were thawed at room temperature before analysis and were sexed using pleon morphology and the number of pleopods (Pinheiro & Taddei, 2005b). A precision caliper (0.05 mm) was used to measure the following structures in each crab: carapace width (CW); carapace length (CL); propodus length (PL); and abdomen width (AW) (Mansur et al, 2005) (Fig. 1).…”

mentioning

confidence: 99%

The relative growth and sexual maturity of the freshwater crab Dilocarcinus pagei (Brachyura, Trichodactylidae) in the northwestern region of the state of São Paulo

Herrera

Davanso

Costa

et al. 2013

Iheringia, Sér. Zool.

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ABSTRACT. 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 CW 50 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 (CW 50 ) 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.KEYWORDS. Allometric growth, gonadal maturity, morphological maturity, reproduction. Os caranguejos foram separados por sexo, de acordo com a morfologia do abdome e pleópodos. As dimensões mensuradas foram: largura da carapaça (LC); comprimento da carapaça (CC); comprimento do própodo (CP) e largura do abdome (LA). Além disso, análise morfológica das gônadas foram realizadas e caracterizadas em relação ao estágio de desenvolvimento. A maturidade morfológica foi estimada com base no estudo do crescimento relativo, esta análise é baseada na equação alométrica y = ax b e a maturidade gonadal através da morfologia das gônadas, utilizando o método LC 50 indicando o tamanho em que 50% dos indivíduos encontram-se com gônadas desenvolvidas para a reprodução. As relações biométricas que melhor indicaram os diferentes padrões de crescimento das fases jovem e adulta foram LCxCP para os machos e LCxAB para fêmeas (p<0,001). Baseado nessas relações, o valor estimado para a maturidade sexual morfológica em machos foi de 21,5 mm (LC) e de 19,7 mm de (LC) para fêmeas. Na determinação da maturidade sexual gonadal, o ajuste da curva logística (LC 50 ) resultou em um tamanho de 38,2 mm para os machos e 39,4 mm para...

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Littoral Communities. Macrocrustaceans

Collins

Williner

Giri

2007

The Middle Paraná River

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Análise comparativa entre a fecundidade de Dilocarcinus pagei Stimpson e Sylviocarcinus australis Magalhães & Turkay (Crustacea, Decapoda, Trichodactylidae) no Pantanal do Rio Paraguai, Porto Murtinho, Mato Grosso do Sul

Cited by 25 publications

References 7 publications

Offspring production in three freshwater crab species (Brachyura: Pseudothelphusidae) from the Amazon region and Central America

Offspring production in three freshwater crab species (Brachyura: Pseudothelphusidae) from the Amazon region and Central America

The relative growth and sexual maturity of the freshwater crab Dilocarcinus pagei (Brachyura, Trichodactylidae) in the northwestern region of the state of São Paulo

Littoral Communities. Macrocrustaceans

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