Variation of steroid concentrations during the reproductive cycle of the clam Ruditapes decussatus: A one year study in the gulf of Gabès area

Ketata, I.; Guermazi, F.; Rebaï, Tarek; Hamza-Chaffai, Amel

doi:10.1016/j.cbpa.2007.01.017

Cited by 38 publications

(22 citation statements)

References 32 publications

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“…The progesterone levels registered in the digestive glands of mussels were similar to those reported for other bivalves (in the range 0.6-5 ng g −1 ww), i.e. in Mytilus edulis [3,8], in the clams Ruditapes decussatus [41] and Ruditapes philipinarum [11], in the soft-shell Mya arenaria [4], and in the infaunal bivalve Scrobicularia plana [42]. These levels were also comparable with those reported for other aquatic invertebrates (1-10 ng g −1 ), i.e.…”

Section: Seasonal Variation Of Progesterone and Pregnenolone In Mytilsupporting

confidence: 76%

“…However, it is difficult to compare steroid concentrations between these studies because of variability between both analytical methods (extraction and quantification procedures) and species physiology (species, organs, maturity stage, etc.). Furthermore, the seasonal progesterone and pregnenolone profiles were similar for males and females, as already observed for progesterone in Mytilus edulis, Mya arenaria, and Ruditapes decussatus [3,4,8,41]. They also indicated that these steroids could play the same role for both sexes.…”

Section: Seasonal Variation Of Progesterone and Pregnenolone In Mytilsupporting

confidence: 67%

“…In the studies on bivalves [3,4,8,11,12,41,42], P levels were determined by immunoassay techniques (RIA and ELISA). In this work, P levels in mussels from the Arcachon Bay exhibited a wider range of seasonal variations over a reproductive cycle.…”

Section: Seasonal Variation Of Progesterone and Pregnenolone In Mytilmentioning

confidence: 99%

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Simple methodology coupling microwave-assisted extraction to SPE/GC/MS for the analysis of natural steroids in biological tissues: Application to the monitoring of endogenous steroids in marine mussels Mytilus sp.

Devier

Labadie

Togola

et al. 2010

Analytica Chimica Acta

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Section: Seasonal Variation Of Progesterone and Pregnenolone In Mytilsupporting

confidence: 76%

Section: Seasonal Variation Of Progesterone and Pregnenolone In Mytilsupporting

confidence: 67%

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Simple methodology coupling microwave-assisted extraction to SPE/GC/MS for the analysis of natural steroids in biological tissues: Application to the monitoring of endogenous steroids in marine mussels Mytilus sp.

Devier

Labadie

Togola

et al. 2010

Analytica Chimica Acta

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“…In bivalve molluscs, the reproductive cycle can be regulated exogenously by environmental factors such as temperature, salinity, light intensity, lunar cycle and food availability (Giese 1959, Stead et al 2002. However, endocrine activity plays an important role in the gametogenic cycle of bivalves (Barber and Blake 2006, Ketata et al 2007, Kang et al 2009). Though less is known regarding the internal factors regulating reproductive processes, bivalves are structural, functional and self-regulated systems showing adaptation mechanisms towards the signals coming from external or internal sources (Ketata et al 2007, Martínez 2008.…”

Section: Introductionmentioning

confidence: 99%

“…However, endocrine activity plays an important role in the gametogenic cycle of bivalves (Barber and Blake 2006, Ketata et al 2007, Kang et al 2009). Though less is known regarding the internal factors regulating reproductive processes, bivalves are structural, functional and self-regulated systems showing adaptation mechanisms towards the signals coming from external or internal sources (Ketata et al 2007, Martínez 2008.…”

Section: Introductionmentioning

confidence: 99%

Latitudinal variation in the reproductive cycle of two bivalves with contrasting biogeographical origin along the Humboldt Current Upwelling Ecosystem

Uribe¹,

Oliva²,

Aguilar³

et al. 2011

Sci. Mar.

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SUMMARY:Argopecten purpuratus (Lamarck, 1819) and Mesodesma donacium (Lamarck, 1818) are bivalves that inhabit the Humboldt Current Upwelling Ecosystem. They have contrasting biogeographical origins, suggesting that their responses to exogenous factors should differ. Using circular statistics, we examine synchrony/asynchrony in the reproductive cycle between populations of each species. The results indicate that there is reproductive asynchrony in both species along their distributional range. However, there was synchrony for A. purpuratus in several location-pairs, including Paita-Chimbote, Chimbote-Callao, Callao-Pisco and Pisco-Antofagasta. For M. donacium, there were only two synchronic groups: Camaná-Capellanía-Mehuín and Hornitos-Peñuelas-Longotoma-La Ligua-Cucao-Quilanlar. A. purpuratus showed gametogenenic activity throughout the year. In contrast, M. donacium showed strong seasonality, with gametogenesis in winter and spawning in spring/summer. In conclusion, the patterns observed for these sympatric species suggest that on a large scale the reproductive cycles follow the expected patterns for the contrasting biogeographic origin of each species, so it could be argued that they are modulated by endogenous factors. However, at a local scale, the reproductive cycles of these species show variation, likely determined by local oceanographic or hydrographic processes.Keywords: Mesodesma donacium, Argopecten purpuratus, synchronic reproduction, gametogenesis, exogenous factors, circular statistics. RESUMEN: Variación latitudinal del ciclo reproductivo de dos bivalvos con orígenes biogeográficos contrastantes a lo largo del ecosistema de afloramiento de la Corriente de Humboldt. -Argopecten purpuratus (Lamarck, 1819) y Mesodesma donacium (Lamarck, 1818) son moluscos bivalvos endémicos del sistema de afloramiento de la Corriente de Humboldt pero tienen orígenes biogeográficos opuestos. Por tanto, se esperaría que los factores exógenos afectaran sus ritmos biológicos diferencialmente, entre ellos sus ciclos reproductivos. Mediante análisis de distribución circular se evaluó el sincronismo/asincronismo en ciclos reproductivos entre poblaciones de cada especie. Los resultados indican que existe asincronía reproductiva en ambas especies a lo largo de su distribución. Sin embargo para A. purpuratus se encontró varios pares de localidades sincrónicas: Paita-Chimbote; Chimbote-Callao; Callao-Pisco y Pisco-Antofagasta, y para M. donacium se dieron dos grupos sincrónicos, el primero entre las poblaciones de Camaná, Capellanía y Mehuín; y el segundo grupo entre Hornitos, Peñuelas, Longotoma, La Ligua, Cucao y Quilanlar. A. purpuratus presentó actividad gametogénica continua. En contraste, M. donacium presentó una marcada estacionalidad, con gametogénesis durante invierno y desoves durante primavera y/o verano. En conclusión, los patrones observados para ambas especies simpátricas sugieren que, a gran escala el ciclo reproductivo sigue los patrones esperados para el origen biogeográfico contrastante de cada especie, por...

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Testosterone levels and fecundity in the hermaphroditic aquatic snail Lymnaea stagnalis exposed to testosterone and endocrine disruptors

Giusti

Ducrot

Joaquim-Justo

et al. 2013

Enviro Toxic and Chemistry

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Endocrine disruptors are known to alter endogenous free and esterified levels of androgenic and estrogenic steroid hormones in aquatic mollusks. The origin of steroids in these animals, however, remains controversial. In the present study, free and esterified testosterone concentrations were measured in the hermaphroditic aquatic gastropod Lymnaea stagnalis exposed to molecules known for their androgenic (testosterone and tributyltin), anti-androgenic (cyproterone-acetate), and estrogenic (chlordecone) properties, by reference to their mode of action in vertebrates. In parallel, snail oviposition and fecundity were followed over a 21-d exposure period. Testosterone exposure resulted in increased esterified testosterone levels, whereas free testosterone concentrations remained stable. In contrast, cyproterone-acetate significantly increased the free form of testosterone with no changes in the esterified form, whereas chlordecone showed a tendency to reduce (though not significantly) esterified testosterone concentrations without changing free testosterone levels. Finally, tributyltin did not alter testosterone homeostasis. The production of egg clutches and eggs was significantly reduced only in the snails exposed to the highest concentrations of chlordecone (19.6 µg/L) and tributyltin (94.2 ng Sn/L). Overall, the present study demonstrates that uptake of testosterone from the exposure medium occurs in L. stagnalis. Moreover, it shows that cyproterone-acetate and, to a lesser extent, chlordecone can alter endogenous testosterone levels in this freshwater snail. However, the relationship between hormonal changes and snail reproduction has not been established. Environ Toxicol Chem 2013;32:1740-1745. © 2013 SETAC.

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Variation of steroid concentrations during the reproductive cycle of the clam Ruditapes decussatus: A one year study in the gulf of Gabès area

Cited by 38 publications

References 32 publications

Simple methodology coupling microwave-assisted extraction to SPE/GC/MS for the analysis of natural steroids in biological tissues: Application to the monitoring of endogenous steroids in marine mussels Mytilus sp.

Simple methodology coupling microwave-assisted extraction to SPE/GC/MS for the analysis of natural steroids in biological tissues: Application to the monitoring of endogenous steroids in marine mussels Mytilus sp.

Latitudinal variation in the reproductive cycle of two bivalves with contrasting biogeographical origin along the Humboldt Current Upwelling Ecosystem

Testosterone levels and fecundity in the hermaphroditic aquatic snail Lymnaea stagnalis exposed to testosterone and endocrine disruptors

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