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Registros recuperados: 8
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Abundancia y madurez sexual de Anadara Similis en el manglar de Luisico, Bahía Malaga, Pacífico colombiano OceanDocs
Manjarrés Villamil, Alex E.; Lucero Rincón, Carlos H.; Walteros, William O.; Kantera Kintz, Jaime R.; Gil Agudelo, Diego L..
La abundancia y madurez sexual de la piangua Anadara similis fue analizada mensualmente entre septiembre de 2009 y agosto de 2010 en el archipiélago de La Plata, Bahía Málaga, Pacífico colombiano. La madurez sexual se analizó a nivel macroscópico mediante la observación del tejido reproductivo en fresco y microscópico por medio de métodos histológicos estándares. Se estimó una densidad media de 0.130 ± 0.098 ind/m2 y una talla media de 42.30 ± 5.00 mm. Los meses de mayor densidad fueron mayo (0.295 ind/m2) y agosto (0.195 ind/m2). La talla media de madurez sexual fue de 41.8 ± 4.5 mm y talla media de 41 mm donde 50% de la población ha tenido mínimo un desove (L50%). Se registraron picos máximos reproductivos durante marzo (83.3%) y abril (75.0%), aunque...
Tipo: Journal Contribution Palavras-chave: Density; Hermaphroditism.
Ano: 2013 URL: http://hdl.handle.net/1834/5454
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Aspectos anatômicos e funcionais do aparelho reprodutor de Parastacus brasiliensis (von Martens) (Crustacea, Decapoda, Parastacidae) Zoologia
Almeida,Alexandre Oliveira de; Buckup,Ludwig.
The absence of morphological external characteristics that allow the recognition of the sex as well as the presence of both male and female gonopores in the same animal [except in some sexual forms of Parastacus nicoleti (Philippi, 1882)] gives rise to the hypothetical existence of some form of hermaphroditism in crayfishes belonging to the genus Parastacus Huxley, 1879. Specimens of Parastacus brasiliensis (von Martens, 1869) were collected in a rivulet at Mariana Pimentel municipality, Rio Grande do Sul, Brazil. In the laboratory they were reared and dissected. The results suggest that P. brasiliensis may be a sequential hermaphroditic species, but male and female gonadal tissues were not simultaneously present in the analized samples. In testes and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Parastacidae; Paraslacus; Brazilian crayfish; Reproductive system; Hermaphroditism.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000200017
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Estrategias reproductivas de moluscos bivalvos y equinoideos OceanDocs
Calvo, J.; Morriconi, E.; Orler, P..
The theoretical aspects of reproductive strategies and life histories are analyzed. The gonadal structures and the main features of gametogenesis of bivalves and echinoids are described. Research on the reproductive characteristics and gametogenic cycles of the bivalve molluscs in the Argentinian littoral and the echinoid Loxechinus albus is reviewed. Special references to Mytilus edulis, Aulacomya ater, Brachidontes purpuratus, Aequipecten tehuelchus, Zygochlamys patagonica, Ostrea puelchana, Clausinella gayi, Protothaca antiqua, Eurhomalea exalbida and Mesodesma mactroides are made. Analysis of reproductive cycles includes histological and ponderal descriptions of gonadal variations. The main trend found is the partial and multiple spawning episodes....
Tipo: Book Section Palavras-chave: Hermaphroditism; Gametogenesis; Life cycle; Marine molluscs; Reproduction; Reproductive cycle; Hermaphroditism; Gametogenesis; Life cycle; Reproduction; Http://aims.fao.org/aos/agrovoc/c_3571; Http://aims.fao.org/aos/agrovoc/c_27931; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1998 URL: http://hdl.handle.net/1834/2581
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First record of a male of Kryptolebias hermaphroditus Costa, 2011 (Cyprinodontiformes: Cynolebiidae) Neotropical Ichthyology
Berbel-Filho,Waldir M.; Espírito-Santo,Helder M. V.; Lima,Sergio M. Q..
ABSTRACT During an ichthyological survey in September 2015 at the Ceará-Mirim River estuary, Rio Grande do Norte State, northeastern Brazil, we collected a male of Kryptolebias hermaphroditus , a cynolebiid species that had been previously described as containing exclusively self-fertilizing hermaphrodites. This is the first record of a male in this species, over 140 years after the discovery of the mangrove rivulid species from Brazil. Our discovery reinforces the need for more studies in K. hermaphroditus , as well as the potential of this species as a model for evolutionary studies due to its unique mating system.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hermaphroditism; Mangrove killifish; Mid-Northeastern Caatinga ecoregion; Mixed-mating system; Sexual dimorphism.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000300212
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Gonocorismo en la vieira patagonica Zygochlamys patagonica (King y Broderip, 1832) en el Banco Reclutas, Argentina OceanDocs
Campodónico, S.; Macchi, G.J.; Lasta, M.L..
Different cases of hermaphroditism in Zygochlamys patagonica were described through histological analysis. Samples were collected in Reclutas Bed. Argentine Sea, SW Atlantic. The hermaphroditism incidence was 0.14. . Thus, the protandric hermaphroditism hypothesis previously suggested by some autors was discarded.
Tipo: Journal Contribution Palavras-chave: Gonads; Histology; Hermaphroditism; Protandry; Hermaphroditism; Gonads; Http://aims.fao.org/aos/agrovoc/c_3571; Http://aims.fao.org/aos/agrovoc/c_34291.
Ano: 2004 URL: http://hdl.handle.net/1834/1502
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Growing knowledge and understanding of dichromatism and sex reversal in Labridae Naturalis
Roede, Machteld J..
A brief survey is given of current literature in comparison with former studies. Since the 18th century phenotypic diversity of Labridae is a matter of argument. At first in dribs and drabs, yet last decades at a rapid rate, dichromatic adult morphs are synonymized. There are few monochromatic species. Wrasses are protogynous hermaphrodites. Most species are described as monandric, but a minority (of slightly or extremely dichromatic) species is diandric, with both primary and secondary males. Terminal males reproduce with single females, but initial phase males spawn in aggregations. Some species are haremic, and large males are permanently or temporarily territorial. Last decades insight in the various social factors has greatly increased, resulting in...
Tipo: Article / Letter to the editor Palavras-chave: Sex reversal; Hermaphroditism; Diandry; Monandry; Sex dimorphism; Color changes; Sexual behavior; Labridae.
Ano: 1990 URL: http://www.repository.naturalis.nl/record/504233
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Hermaphroditism in Marine Mussel Perumytilus purpuratus (Lamarck, 1819), (Mollusca: Mytilidae) International Journal of Morphology
Montenegro Villalobos,Diana; Olivares Paz,Alberto; González,María Teresa.
Marine bivalves are essentially gonochoric species. However, some occasional hermaphrodites specimens can be found. A histological description of two (among 179) hermaphrodites of the marine mussel Perumytilus purpuratus (Lamarck, 1819) that were collected in San Jorge Bay (24S) is given. The low proportion of hermaphrodites suggests that P. purpuratus hermaphroditism could be an accidental phenomenon; nevertheless other causes are also discussed in the present study.
Tipo: Journal article Palavras-chave: Bivalve; Hermaphroditism; Perumytilus purpuratus.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200038
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Le déterminisme du sexe de l’huître creuse Crassostrea gigas au cours de son développement et du cycle gamétogénétique adulte : recherche de déterminants moléculaires ArchiMer
Naimi, Amine.
The pacific oyster Crassostrea gigas is a successive protandric irregular hermaphrodite. The factors involved in the first gonadic differentiation in juveniles and those involved in sex reversal in adults are still unknown. This thesis consisted in the identification of molecular factors of the oyster’s gonadic differentiation during its adult cycle and its development. Thus, the respective orthologs to a DM-family factor and to Foxl2, Cg-DMl and Cg-Foxl2, have been characterized in the oyster by RT-PCR. Their study by real-time PCR, in situ hybridization and immunohistochemistry, has highlighted a ubiquitous expression of Cg-DMl in potentially proliferating / differentiating cells in the gonads of both sexes. The Cg-Foxl2 expression is specific to the...
Tipo: Text Palavras-chave: Différenciation sexuelle; Crassostrea gigas; Mollusques marins; Gamétogenèse; Hermaphrodisme; DMRT; FOXL2; Sex differentiation; Crassostrea gigas; Marin molluscs; Gametogenesis; Hermaphroditism; DMRT; FOXL2.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00012/12291/9080.pdf
Registros recuperados: 8
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