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Anther wall formation, sporogenesis and gametogenesis of Tripterospermum chinense (Gentianaceae), with emphasis on uniformity of characters in Tripterospermum and its systematic values Naturalis
Ao, C..
Tripterospermum sensu T.N.Ho comprises two sections that are readily discriminated morphologically. In the present paper, embryological characters in anther wall formation, sporogenesis and gametogenesis of Tripterospermum chinense, a member of sect. Platyspermum, are reported. Comparisons based on available data show that as far as the two recognized sections are concerned, embryological characters are uniform in all aspects, disapproving of the splitting of the genus into two sections. The notable differences between Tripterospermum and closely related genera support the phylogenetic conclusion that Tripterospermum is monophyletic.
Tipo: Article / Letter to the editor Palavras-chave: Anther wall; Gametogenesis; Sect. Platyspermum; Sect. Tripterospermum; Sporogenesis; Systematic values; Tripterospermum chinense.
Ano: 2012 URL: http://www.repository.naturalis.nl/record/525218
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Biología reproductiva de algunas especies de la tribu Thenaria (Cnidaria: Anthozoa) en el litoral marplatense OceanDocs
Excoffon, A.C..
Universidad Nacional de Mar del Plata, Facultad de Ciencias Exactas y Naturales (Argentina).
Tipo: Theses and Dissertations Palavras-chave: Sexual reproduction; Asexual reproduction; Gametogenesis; Reproductive cycle; Embryonic development; Larval development; Comparative studies; Asexual reproduction; Gametogenesis; Embryonic development; Sexual reproduction; Http://aims.fao.org/aos/agrovoc/c_664; Http://aims.fao.org/aos/agrovoc/c_27931; Http://aims.fao.org/aos/agrovoc/c_2545; Http://aims.fao.org/aos/agrovoc/c_26876.
Ano: 1993 URL: http://hdl.handle.net/1834/2957
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Biological variables of Hypostomus francisci (Siluriformes: Loricariidae) from Itapecerica River, Minas Gerais State, Brazil Anais da ABC (AABC)
SALES,CAMILA F.; DOMINGOS,FABRÍCIO FLÁVIO T.; BRIGHENTI,LUDMILA S.; RIBEIRO,ROSY I.M.A.; SANTOS,HÉLIO B.; THOMÉ,RALPH G..
ABSTRACT Herein we determine for the first time the reproduction parameters and population structure of Hypostomus francisci in the Itapecerica River, São Francisco Basin. A total of 250 specimens was captured quarterly between March 2010 and February 2012. Body weight, total length and weight of the gonads were obtained in the laboratory. Gonad samples were submitted to histological and histochemical techniques. Females with spawning capable ovaries were used to determine the fecundity and relative fecundity. Sex ratio with 1:1.01 (female:male) was observed. Males were more numerous than females for individuals smaller than 170 mm, however the number of females was significantly greater for specimens larger than 330 mm. The length-weight relationship...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fecundity; Gametogenesis; Neotropical freshwater fish; Population structure; Reproduction.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501603
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Characterization of summer mortalities of C. gigas oyster in France in relation to environmental parameters ArchiMer
Soletchnik, Patrick; Ropert, Michel; Bedier, Edouard; Costil, K. S.; Dubois, Brice; Degremont, Lionel; Bouget, Jean-francois; Martin, Jean-louis; Enriquez-diaz, M.; Faury, Nicole; Le Moine, Olivier; Renault, Tristan; Gagnaire, Beatrice; Huvet, Arnaud; Moal, Jeanne; Samain, Jean-francois.
Field characterization of summer mortality was performed in France in the frame of the Morest project. Natural and hatchery spat were compared between three oyster production areas in France. Regardless of the natural or hatchery origin, oysters died during the reproduction period after temperature reaches 19 degree C. Thus, in southern areas, temperature accelerated gametogenesis of small spat (10mm) as well as adults, and mortality appeared for the two age classes. In contrast, sexual maturation proceeded more slowly in northern where spat mortality was lower compared to 18 months old oysters. However, critical gametogenesis and temperature were not sufficient to induce mortalities, as observed in examples with stable environment. Alternatively sediment...
Tipo: Text Palavras-chave: Seasonal variation; Oyster culture; Mortality causes; Hatcheries; Gametogenesis; Environmental factors; Crassostrea gigas; Oysters.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-3348.pdf
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Comparative histological study of gametogenesis in diploid and triploid pacific oysters (Crassostrea gigas) reared in an estuarine farming site in France during the 2003 heatwave ArchiMer
Normand, Julien; Le Pennec, Marcel; Boudry, Pierre.
We compared the temporal dynamics of gametogenesis in diploid and triploid Pacific oysters (Crassostrea gigas) using histology. Oysters were reared in an estuarine farming site in Brittany over 3 years and their gametogenesis was monitored over the exceptionally hot summer of 2003. Both diploids and triploids showed active gametogenesis, but a high proportion of triploids remained at early stages of gonad development. Gametogenesis of triploids was characterized by the simultaneous occurrence of gonias and immature cytes together with mature gametes rather than overall retardation, though some triploids showed complete gonad maturation. Evidence of spawning was seen in both groups, and the quantity of germinal products emitted appeared to be similar in...
Tipo: Text Palavras-chave: Triploidy; Crassostrea gigas; Oyster; Gametogenesis.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4152.pdf
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Conditionnement artificiel de l'huître Crassostrea gigas ArchiMer
Jorge Eduardo, Chávez Villalba.
In France, 90% of the annual cup oyster (Crassostrea gigas) production comes from larvae caught in the Arcachon and Marennes-Oléron basins. However, the spat catch shows many interannual irregularities and oyster farmers increasingly say they need spat outside of the reproductive period. Thus, the role of hatcheries in Japanese oyster spat production in France is becoming increasingly evident. However, the current state of knowledge about cup oyster reproduction in controlled conditions is limited, and hatchery professionals must confront various problems to optimise treatment of genitors so as to obtain larval breeds in good health and a lengthening of the reproductive season. To respond to this, we have carried out a study on three aspects that seem...
Tipo: Text Palavras-chave: Water temperature; Biochemical studies; Gametogenesis; Breeder conditioning; Larval rearing.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/these-1456.pdf
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Déterminismes génétiques de l'allocation à la reproduction chez les huîtres creuses (Crassostrea gigas) triploïdes ArchiMer
Normand, Julien.
In diploid Pacific oyster Crassostrea gigas, gonadic development can be important in terms of energetic investment. Phenotypic and genetic negative correlations have also been observed between gonadic occupation and traits related to survival and growth, and this fact suggests that this trait could be deleterious for its aquaculture production. Triploidy can be been artificially induced to improve the production of Pacific oysters as it results in a general diminution of mean gonadic development. This trait is however highly variable. In this context, this study aimed to quantify and qualify the allocation to reproduction in triploid oysters and to study its genetic bases. Variability for allocation to reproduction and growth was first studied in 3 sets of...
Tipo: Text Palavras-chave: Triploidy x genetic interaction; Genetic determinism; Sexual dimorphism; Gametogenesis; Allocation to reproduction; Triploid; Oyster; Interaction triploïdie x génétique; Déterminisme génétique; Dimorphisme sexuel; Gamétogenèse; Allocation à la reproduction; Triploïde; Huître.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/these-6971.PDF
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Disruption of amylase genes by RNA interference affects reproduction in the Pacific oyster Crassostrea gigas ArchiMer
Huvet, Arnaud; Beguel, Jean-philippe; Cavaleiro, Nathalia; Thomas, Yoann; Quillien, Virgile; Boudry, Pierre; Alunno-bruscia, Marianne; Fabioux, Caroline.
Feeding strategies and digestive capacities can have important implications for variation in energetic pathways associated with ecological and economically important traits, such as growth or reproduction in bivalve species. Here, we investigated the role of amylase in the digestive processes of Crassostrea gigas, using in vivo RNA interference. This approach also allowed us to investigate the relationship between energy intake by feeding and gametogenesis in oysters. Double-stranded (ds)RNA designed to target the two α-amylase genes A and B was injected in vivo into the visceral mass of oysters at two doses. These treatments caused significant reductions in mean mRNA levels of the amylase genes: −50.7% and −59% mRNA A, and −71.9% and −70.6% mRNA B in 15...
Tipo: Text Palavras-chave: Alpha-Amylase; DsRNA; Gametogenesis; Marine bivalve; Dynamic energy budget.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00271/38239/36422.pdf
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Ecophysiologie de l'huître creuse Crassostrea gigas (Thunberg) : analyse bioénergétique de la gamétogenèse sous trois conditions trophiques distinctes ArchiMer
Bourles, Yves.
The Pacific oyster (Crassostrea gigas) is a major cultivated shellfish resource in France, which represented a tumover of 220 millions € in 2000. Mass mortalities among this commercially important bivalve species are known in France since about 40 years, but have become a recun'ing obstacle for growers of oysters and a threaten for commercial production along the French Atlantic coast in the last 20 years. Since 2000, IFREMER is canying out a multidisciplinary program, MOREST, ta understand the problem of summer mortality, and possibly ta solve il. As part of the MOREST program, the present study focuses on the relationship between gametogenesis, metabo lism and mortality of 7-month, i.e. juvenil e, C. gigas. In April 2004, a total of 2250 oysters were...
Tipo: Text Palavras-chave: Crassostrea gigas; Naissain; Mortalité estivale; Gamétogenèse; Bilan énergétique; Crassostrea gigas; Spot; Summer mortalities; Gametogenesis; Energy budget.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00448/55961/57444.pdf
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Effect of food conditioning on gonadic activity in the oyster Pinctada margaritifera ArchiMer
Le Moullac, Gilles; Hui, Belinda; Vonau, Vincent; Levy, Peva; Cochard, Jean-claude.
Preliminary experiments allowed defining basic requirements of Pinctada margaritifera for somatic and gonadic growth in controlled conditions. This study was continued by observation of the gametogenesis at a cellular level. In April/May 2008, 125 oysters were conditioned for 30 days in 25 tubular tanks (30 L). Water was renewed 4 times/hour. A mixed (v:v) diet of Isochrysis galbana (T-Iso) and Chaetoceros gracilis was supplied continuously. A control batch of 125 oysters was maintained in trays in the lagoon. An initial sample of 30 individuals was made. Gonadic changes were first characterized using a gonadal development index (GDI) based on the ratio of the gonad area to the total visceral mass area on a sagittal section of the body. Histological...
Tipo: Text Palavras-chave: Pearl oyster; Reproduction; Gametogenesis; Broodstock.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00029/14010/11196.pdf
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Effect of phytoplankton and temperature on the reproduction of the Pacific oyster Crassostrea gigas: investigation through DEB theory ArchiMer
Bernard, Ismael; De Kermoysan, Goulwen; Pouvreau, Stephane.
DEB theory can be used to obtain a detailed description of energy allocation in organisms and the control of this allocation by temperature and food concentration. In this study, we modified the model of Bourlès et al. (2009) developed for the Pacific oyster, Crassostrea gigas, to improve the description of reproductive effort. The model was amended in two ways: a new set of parameters was incorporated and a full description of gonad construction in spring was added, with a new state variable. The application of this model to a dataset for oyster growth measured in four bays over two years showed that this model better described reproductive effort, without modifying overall growth dynamics. We then explored the reproductive responses of oysters to their...
Tipo: Text Palavras-chave: DEB model; Crassostrea gigas; Gametogenesis; Reproductive effort; Spawning date; Functional response.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00059/17047/14606.pdf
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Environmental stress in the pacific oyster Crassostrea gigas during gametogenesis : role of herbicides? ArchiMer
Burgeot, Thierry; Quirion, Sophie; Quiniou, Francoise; Knoery, Joel; Soletchnik, Patrick; Gagnaire, Beatrice; Renault, Tristan; Osada, M.; Geret, F.; Communal, P. Y.; Jadas-hecart, A.; Gagne, F..
In the Atlantic French coast, significant mortalities were observed in oyster communities during gametogenesis. These deaths possibly result from the cumulative effects of various stressors such as seasonal temperature variations, pesticide application and the release of contaminants from the resuspension of sediments. A field survey, based on aquaculture conditions at 15 and 70 cm from the sediment bed with genetically-resistant (R) and -sensitive (S) lines, showed a stress condition. Significant weight loss was observed during May 14th through June 10th for both R and S lines. On one hand, the levels of the egg yolk vitellin in females were decreased at May 14th for both R and S lines. On the other hand, a significant increase in vitellin production was...
Tipo: Text Palavras-chave: Mortalities; Herbicides; Sediment; Biomarkers; Gametogenesis; Crassostrea gigas; Pacific oysters.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/acte-3384.pdf
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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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Etude comparative du cycle de reproduction de la palourde Ruditapes decussatus en milieu naturel (sud Tunisie) et contrôlé (écloserie) ArchiMer
Hamida, Leila; Medhiouband, Mohamed; Cochard, Jean-claude; Romdhane, Mohamed; Le Pennec, Marcel.
A comparative study of the reproductive cycle of Ruditapes decussatus under natural (South of Tunisia) and controlled conditions (hatchery). The aim of this study was to describe and compare the gametogenic activity of Ruditapes decussatus in situ and in hatchery. Criteria of maturity were characterized and the positive role of conditioning in the success of artificial reproduction was underlined. Specimens sampled in the South of Tunisia were conditioned at the experimental station of Monastir (Tunisia). The parameters studied were the variation of the condition index and the frequency distribution of oocyte diameters. Results showed that the reproductive cycle was continuous in situ. Gametogenesis started in January and February. Gonadic activity...
Tipo: Text Palavras-chave: Ruditapes; Natural conditions; Hatchery; Reproduction; Gonatic activity; Gametogenesis.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-882.pdf
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Etude cytologique de la gamétogenèse, de la sex-ratio et du cycle de reproduction chez l'huître perlière Pinctada margaritifera (L) var. cumingii (Jameson), (mollusques, bivalves). Comparaison avec le cycle de Pinctada maculata (Gould) ArchiMer
Thielley, Maryse.
The population of Pinctada margaritifera and Pinctada maculata lay eggs throughout the year. Temperature variations induce huge but asynchronous laying. Preferential periods of gonad maturity correspond to the season changings in both species. However. some differences between the two specics are noticed. Both species are protandric hermaphrodites. Female condition is unstable: a reversion to the male condition may be observed and is probably linked with stress. The average size for the first sexual maturation as weil as for sexual conversion are specified in P. margaritifera. The breeding conditions induce modifications in some reproductive cycle processes (maturation, sex-ratio). Some conditions suitable for reproduction may become unfavorable to...
Tipo: Text Palavras-chave: Gamétogenèse; Cycle de reproduction; Sex-ratio; Pinctad margaritifera; Mollusque; Bivalve; Huître perlière; Gametogenesis; Reproductive cycle; Sex-ratio; Pinctada margaritifera; Mollusca; Bivalvia; Pearl oyster.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00440/55208/56677.pdf
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Feeding the pearl oyster Pinctada margaritifera during reproductive conditioning ArchiMer
Le Moullac, Gilles; Soyez, Claude; Sham-koua, Manaarii; Levy, Peva; Moriceau, Jacques; Vonau, Vincent; Maihota, Mayalen; Cochard, Jean-claude.
This study aimed to model the food intake of P. margaritifera in order to examine the relationship between food level and reproductive activity. The effect of microalgae concentration on ingestion rate and assimilation efficiency was studied over a broad concentration range, using a mixture of Isochrysis galbana and Chaetoceros gracilis. Reproductive effort was assessed using three microalgae concentrations of 0.5, 7 and 18 cell μL-1. Reproductive status was assessed by gonad development index (GDI) – the ratio of the gonad surface to the visceral mass surface – and histological analysis of the gonad based on the presence (continuous or discontinuous) or the absence of gonial cells (GC). Ingestion is a saturating function of seston concentration for...
Tipo: Text Palavras-chave: Pinctada margaritifera; Food level; Ingestion rate; Reproduction; Gametogenesis.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00050/16085/13562.pdf
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Fertilidad y fecundidad de Montastraea annularis en un arrecifes degradado OceanDocs
Alvarado-Ch., E.; Acosta, A..
Este estudio determinó el ciclo gametogénico, fecundidad y fertilidad de Montastraea annularis en el arrecife de isla Grande, archipiélago de Nuestra Señora del Rosario, uno de los arrecifes más degradados del Caribe colombiano. La población de estudio se caracteriza por poseer colonias medianas (alrededor de 3379 cm2), con mortalidad parcial en 27 % de los ramets y totoal en el 10 % de los mismos. Las colonias presentan un alto número de ramets pequeños producto de la fisión (76 % menores a 50 cm2). Basado en las características de la estructura de tallas de la población mencionada, el objetivo de esta investigación fue explicar el bajo reclutamiento registrado en la zona, a través de la respuesta reproductiva de una población con dominancia de ramets...
Tipo: Journal Contribution Palavras-chave: Degradation; Fecundity; Fertility; Gametogenesis; Degradation; Gametogenesis; Fecundity; Fertility; Http://aims.fao.org/aos/agrovoc/c_2159; Http://aims.fao.org/aos/agrovoc/c_27931; Http://aims.fao.org/aos/agrovoc/c_15725; Http://aims.fao.org/aos/agrovoc/c_2862.
Ano: 2009 URL: http://hdl.handle.net/1834/3610
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Gametogenesis, reproductive investment, and spawning behavior of the Pacific giant oyster Crassostrea gigas: evidence of an environment-dependent strategy ArchiMer
Enriquez-diaz, M.; Pouvreau, Stephane; Chavez-villalba, J.; Le Pennec, M..
The progress of gametogenesis was studied in oysters Crassostrea gigas having the same origin (Tremblade), but cultured during 1 year in two distinctive French marine areas, the Baie des Veys and Marennes-Ol,ron. We assessed seasonal changes in the reproduction cycle on the basis of stereological techniques to estimate reproductive investment and measurement of gonad evolution area by quantitative histology. From a qualitative point of view, both oyster groups presented typical reproductive stages, but showed differential timing, in particular during the sequence of spawning and duration of the re-absorption stage. Oysters in Baie des Veys had a single partial spawning in August and a re-absorption stage that extended until winter. Oysters in...
Tipo: Text Palavras-chave: Stereology; Reproductive investment; Pacific oysters; Image analysis; Gametogenesis; Crassostrea gigas.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7300.pdf
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Gametogenic cycle and reproductive effort of the tropical blacklip pearl oyster, Pinctada margaritifera (Bivalvia : Pteriidae), cultivated in Takapoto atoll (French Polynesia) ArchiMer
Pouvreau, Stephane; Gangnery, Aline; Tiapari, Jerome; Lagarde, Franck; Garnier, Matthieu; Bodoy, Alain.
The gametogenic cycle and the reproductive effort of the blacklip pearl oyster, Pinctada margaritifera, cultivated in Takapoto lagoon were studied for a 1-year period (March 1997-April 1998) by bimonthly observations of gonadal sections, dry tissue weights and gonadal index in a population of pearl oyster composed of three age-groups. pearl oysters attained sexual maturity in the end of their first year (height approximate to 40 mm), implying that P. margaritifera is a late-maturing species in comparison with other Pteriidae. This species was also confirmed to be a marked protandrous successive hermaphrodite in culture, with 100 % of males at first maturity and 75 % in older pearl oyster (height > 120 mm). The general pattern of gametogenic activity,...
Tipo: Text Palavras-chave: French Polynesia; Reproductive effort; Reproductive cycle; Tropical aquaculture; Gametogenesis; Blacklip pearl oyster; Polynésie française; Effort de reproduction; Cycle de reproduction; Aquaculture tropicale; Gamétogenèse; Huître perlière.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-1391.pdf
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Gametogenic cycle of Ophioderma januarii, a common Ophiodermatidae (Echinodermata: Ophiuroidea) in southeastern Brazil Rev. Bras. Zool.
Borges,Michela; Yokoyama,Leonardo Q; Amaral,Antonia C. Z..
This study describes the gametogenic cycle of Ophioderma januarii Lütken, 1856, a common species of ophiuroid in Southeastern Brazil. The specimens were collected during the project "Biodiversidade Bêntica Marinha no Estado de São Paulo-BIOTA/FAPESP-Bentos Marinho" (Marine benthic biodiversity in the State of São Paulo-BIOTA/ Fapesp-Marine Benthos) which was conducted off the northern coast of the state of São Paulo. Specimens were captured monthly between February 2001 and December 2002. Due to the low number of individuals the monthly data was grouped in seasons (spring to winter). A total of 101 specimens were obtained: 33 in spring, 10 in summer, 23 in autumn, and 35 in winter. The gonads of eighty-eight individuals (45 females, 42 males, and one...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gametogenesis; Ophiuroid; Recruitment.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100018
Registros recuperados: 40
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