Characterization of the sexual pattern of <i>Parastacus varicosus</i> (Crustacea: Decapoda: Parastacidae)

Silva-Castiglioni, Daiana da; Greco, Laura López; Oliveira, Guendalina Turcato; Bond‐Buckup, Georgina

doi:10.1111/j.1744-7410.2008.00144.x

Cited by 12 publications

(13 citation statements)

References 36 publications

(72 reference statements)

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“…Rudolph, 1999Rudolph, , 2002, Parastacus varicosus (Faxon, 1898) (cf. Rudolph et al, 2001;Silva-Castiglioni et al, 2008), P. brasiliensis (cf. Almeida & Buckup, 2000) and Viriliastacus rucapihuelensis (Rudolph & Crandall, 2005) (cf.…”

Section: Introductionmentioning

confidence: 97%

First report of intersex in the signal crayfish Pacifastacus leniusculus (Dana, 1852)

Yazicioglu

Linhartová

Niksirat

et al. 2014

Crustac

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The reproductive strategies of species of non-indigenous crayfish make an important issue in astacological research. Although crayfish reproduction has been well studied, there is little information available on the occurrence of intersexuality. We report the first evidence of intersex in the signal crayfish, Pacifastacus leniusculus (Dana, 1852). An intersexual specimen was found among five tested signal crayfish. Morphology revealed both male and female genital openings, as well as male gonopods. The specimen superficially appeared male but contained both testes and ovaries, with an atypical dispersed structure. Sperm was obtained from this crayfish. Flistology showed both spermatocytes and oocytes. The gonadosomatic index (GSI = 3.79) was considered as a morphometric parameter of the intersexual crayfish. The ova present in the intersex male raised its GSI to the three-fold of that of normal males. RÉSUMÉLes stratégies de reproduction des espèces d'écrevisses non-indigènes constituent une question importante en recherche astacologique. Bien que la reproduction des écrevisses ait été bien étudiée, il y a peu d'information disponible sur la fréquence de l'intersexualité. Nous rapportons la première preuve d'un intersexué chez l'écrevisse Pacifastacus leniusculus (Dana, 1852). Un spécimen intersexué a été trouvé parmi les cinq écrevisses testées. La morphologie révèle les deux ouvertures génitales mâles et femelles, ainsi que des gonopodes de mâle. Le spécimen apparaît superficiellement mâle mais contient à la fois testicules et ovaires, avec une structure dispersée atypique. Du sperme a été obtenu de cette écrevisse. L'histologie montre à la fois des spermatocytes et des ovocytes. L'index gonadosomatique (GSI = 3,79) a été considéré comme un paramètre morphométrique de l'écrevisse intersexuée. Les ovules présents chez le mâle intersexué ont multiplié son GSI par trois par rapport à celui d'un mâle normal. ')

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Section: Introductionmentioning

confidence: 97%

First report of intersex in the signal crayfish Pacifastacus leniusculus (Dana, 1852)

Yazicioglu

Linhartová

Niksirat

et al. 2014

Crustac

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“…Crustaceans show variations in intermediary metabolism, which are mainly related to the reproductive period because of the high energy demands at this time (Kucharski and Da Silva, 1991a;Rosa and Nunes, 2003a;Silva-Castiglioni et al, 2008). Metabolic reserves are also used and/or stored during periods of reduction of the oxygen level in the environment, where principally an increase in lactate occurs as a product of the anaerobic metabolism; in crustaceans, lactate is the main anaerobic metabolite (Hill et al, 1991;Hervant et al, , 1997Zou et al, 1996;Oliveira et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Comparison of the seasonal variation of the biochemical composition in two species of freshwater crayfish from southern Brazil

et al. 2012

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The aim of this study was to compare seasonal variations in the metabolism of two crayfish species with different habitats, Parastacus defossus that lives in subterranean galleries with low oxygen concentrations and Parastacus brasiliensis that lives in oxygenated environments. The metabolism of the species was compared, mainly evaluating the mobilization of the reserves for the reproductive period, and the metabolic response during the seasonal cycle. Seasonal sampling was conducted from spring 2006 to winter 2007. P. brasiliensis was collected at Mariana Pimentel, and P. defossus at Lami, Porto Alegre, Rio Grande do Sul. Hemolymph, hepatopancreas, muscle, gills, and gonads were removed for determination of glucose, free glucose, glycogen, lactate, total protein, total lipids, total cholesterol, and arginine phosphate. The hepatopancreatic and gonadosomatic indexes were determined. The results showed different seasonal responses between the species for all metabolic parameters, with the exception of proteins in gills, and of lactate in haemolymph. Lactate levels were slightly, but insignificantly, higher in P. defossus than in P. brasiliensis during the period of reduced oxygen. A significant difference between sexes was recorded in only some metabolites. The variability of the metabolism appears to be related to the reproductive period, but the exploratory activity in the environment also seems to be related to these variations. However, other factors may also be influencing the metabolism, such as the availability of food, and environmental conditions such as water, pH, temperature and dissolved oxygen levels, as previously observed for other decapods.

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“…Rudolph, 1997). The sexual system of Parastacus varicosus Faxon, 1898, has been studied by Rudolph et al (2001) and by Silva-Castiglioni et al (2008) in Uruguayan and Brazilian populations, respectively. Nevertheless, this species can not be classified into any of the aforementioned sexual systems, because the results obtained are contradictory.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, this species can not be classified into any of the aforementioned sexual systems, because the results obtained are contradictory. According to Rudolph et al (2001), the species presents permanent intersexuality, whereas Silva-Castiglioni et al (2008) classify it as a protandric hermaphrodite.…”

Section: Introductionmentioning

confidence: 99%

Intersexuality in the burrowing crayfish, Parastacus pilimanus (Von Martens, 1869) (Decapoda, Parastacidae)

Rudolph

Verdi

2010

Crustac

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Various authors have reported the occurrence of supernumerary gonopores in many species of Parastacus, which has generated discussion about their sexual system. In this study, we examine the external and internal sexual characters of 102 specimens of the burrowing crayfish, Parastacus pilimanus, captured in the province of Maldonado in southeast Uruguay, with the aim of clarifying its sexual system. In this study, we show that in all the specimens analysed, female and male gonopores co-existed externally, and we verified the presence of only one type of gonad internally: either ovary (intersex females) or testis (intersex males), from which one pair of oviducts and another of sperm ducts originated, connecting the gonad to the respective gonopores. We also verified that all specimens smaller than 27.2 mm cephalothorax length (CL) (N = 73) had the same external morphology. Nevertheless, dissection revealed that their gonads were already differentiated. We established that 54.8% of these specimens were intersex females, while the remaining percentage corresponded to intersex males. Twenty-nine specimens were found with a CL equal to, or above, 27.2 mm. Of these, 34.5% (N = 10) were intersex males with the same external morphological traits that characterize all specimens smaller than 27.2 mm CL. The remaining 19 specimens (65.5%) were intersex females, 15 of which presented secondary sexual characters, probably associated with egg incubation. The evidence gathered suggests that Parastacus pilimanus has permanent intersexuality, similar to Parastacus pugnax and Parastacus varicosus in Uruguay. We conclude by identifying some topics that require further study, in order to understand the adaptive value of this type of intersexuality. RESUMENVarios autores han reportado la ocurrencia de gonoporos supernumerarios en muchas especies de Parastacus, lo que ha generado discusión acerca del sistema sexual de ellas. En este trabajo nosotros examinamos los caracteres sexuales externos e internos de 102 especimenes del camarón excavador Parastacus pilimanus capturados en el Departamento de Maldonado, sureste de Uruguay, 3 )

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Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)

Cited by 12 publications

References 36 publications

First report of intersex in the signal crayfish Pacifastacus leniusculus (Dana, 1852)

First report of intersex in the signal crayfish Pacifastacus leniusculus (Dana, 1852)

Comparison of the seasonal variation of the biochemical composition in two species of freshwater crayfish from southern Brazil

Intersexuality in the burrowing crayfish, Parastacus pilimanus (Von Martens, 1869) (Decapoda, Parastacidae)

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