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| Registros recuperados: 10 | |
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| Sussarellu, Rossana; Huvet, Arnaud; Lapegue, Sylvie; Quillen, Virgile; Lelong, Christophe; Cornette, Florence; Jensen, Lasse Fast; Bierne, Nicolas; Boudry, Pierre. |
| Background Originating from Northeast Asia, the Pacific oyster Crassostrea gigas has been introduced into a large number of countries for aquaculture purpose. Following introduction, the Pacific oyster has turned into an invasive species in an increasing number of coastal areas, notably recently in Northern Europe. Methods To explore potential adaptation of reproductive traits in populations with different histories, we set up a common garden experiment based on the comparison of progenies from two populations of Pacific oyster sampled in France and Denmark and their hybrids. Sex ratio, condition index and microarray gene expression in gonads, were analyzed in each progeny (n = 60). Results A female-biased sex-ratio and a higher condition index were... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Adaptation; Invasiveness; Fertility; Sex-ratio; Transcriptome; Microarray. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00287/39829/38343.pdf |
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| Nakagaki,Jelly Makoto; Pinheiro,Marcelo Antonio Amaro. |
| Emerita brasiliensis Schmitt, 1935 is a common mole crab called "tatuíra" in Brazil, with distribution from Espírito-Santo State (Brazil) to Buenos Aires Province (Argentina). Specimens were collected bimonthly from May/1992 through March/1993 with 4mm siffers mesh, in the intertidal region at Vermelha do Norte Beach, Ubatuba, São Paulo, Brazil. The animals were sexed and measured with a precision caliper of 0.1 mm (Cl = carapace length). Males presented cl amplitude from 3.4-17.3mm (13.2±2.1mm), and females from 13.8-26.3mm (20.5±1.8mm), showing a well-defined sexual dimorfism for this variable. The population presented a smaller incidence of males in relation to females (0.54:1.00), however in May/1992 an inverse pattern occurred (1.84:1.00). Ovigerous... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hippidae; Emerita brasiliensis; Population structure; Sex-ratio. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000600010 |
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| Nogueira,Caio dos Santos; Perroca,Júlia Fernandes; Piantkoski,Emerson Luiz; Costa,Rogerio Caetano da; Taddei,Fabiano Gazzi; Fransozo,Adilson. |
| Abstract During the ontogenetic development of crustaceans, the relative growth of some structures may change, especially during the transition from juvenile to adult. This study describes the relative growth of body structures of Macrobrachium iheringi, and provides information on its population dynamics, such as structure, fecundity, and morphological sexual maturity. The sampling of M. iheringi was carried out in “Ribeirão da Hortelã”, in Botucatu (SP, Brazil). The length of the carapace (CL), abdomen (AL), and ischium (IL), merus (ML), carpus (CrL), propodus (PpL), and dactyl (DcL) of the second right pereopod were measured. In addition, the width of the second abdominal pleura (PW) and propodus height (PpH) were included in analyses. The relationships... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allometry; Freshwater; Caridea; Populations; Sex-ratio. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100208 |
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| N'goran, Ya Nestor. |
| Ethmalosa fimbriata (Bowdich) est un clupeidé très abondant dans les pêcheries artisanales ivoiriennes. Il représente plus de 60% des captures lagunaires. En lagune Aby, la taille de première maturité sexuelle se situe à 9.6cm pour le mâle et 9.9cm pour la femelle. La reproduction a lieu deux fois dans l'année pendant les saisons à relativement haute salinité, de février à mai et de juillet à août. Cette reproduction n'affecte pas de façon significative le sex-ratio dont la moyenne varie de 35% à 36% selon la période. La fécondité absolue est très fluctuante et varie de 11.000 à 148.000 oeufs par femelle. |
| Tipo: Journal Contribution |
Palavras-chave: Reproduction; Cycle sexuel; Sex-ratio; Fécondité. |
| Ano: 1991 |
URL: http://hdl.handle.net/1834/5060 |
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| Broquard, Coralie; Martinez, Anne-sophie; Maurouard, Elise; Lamy, Jean-baptiste; Dégremont, Lionel. |
| Understanding sex determination in the Pacific oyster Crassostrea gigas, a sequential hermaphrodite, can provide prospective on the evolution of sex-determining systems for comparative reproduction from an evolutionary perspective. Surprisingly, this mechanism is still poorly understood. To date, sex ratio and sex change have never been studied at the individual level for a large size group and long-term monitoring. To this purpose, we performed an ambitious individual long-term follow-up (6 years) on a large population (cohort 1: 7488 oysters) produced from wild oysters, as well as for a second population produced from the cohort 1 (cohort 2: 4320 oysters). All oysters were individually sexed from 2014 to 2019. For the cohort 1, our results showed a... |
| Tipo: Text |
Palavras-chave: Sex-ratio; Sex change; Oysters; Hermaphroditism; Crassostrea gigas. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00587/69868/67845.pdf |
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| Miscali,Monica. |
| The aim of this article is to investigate the situation of the rural servants in Norway from the preindustrial period, the rural Norway, to industrialisation in the middle of XIX century. I will summarise the research that has been carried out in Norway. In particular I will describe the evolution of the servant’s role and tasks, underlining the transformations and passages from an agrarian society to an industrial one and the importance of the service activities from a demographic prospective. Furthermore I will describe the gender roles, the sex-ratio, the differences between male and female servants and the differences in the treatment they received. I will contextualise the case of Norway and see if there were similitudes or differences in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Norway; Domestic service; Servants role; Sex-ratio; Rural servants. |
| Ano: 2017 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1515-59942017000300002 |
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| Registros recuperados: 10 | |
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