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| Registros recuperados: 672 | |
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| ABUDUREHEMAN,B.; CHEN,Y.; LI,X.; ZHANG,L.; LIU,H.; ZHANG,D.; GUAN,K.. |
| ABSTRACT: Carex physodes is an ephemeral species in the cold desert of Gurbantunggut in Northwest China. It has both asexual and sexual reproductive patterns. The primary aims of this study were to characterize the reproduction systems and identify the role of fruit dispersal in the sexual reproduction of C. physodes. Aboveground and underground biomass, root-shoot ratio, inflorescence biomass, fruit-set of C. physodes were measured and dispersal of perigynia and achenes in the natural habitat and indoor condition were studied. The underground biomass of C. physodes was approximately 10 times more than the aboveground biomass. The most parts of aboveground biomass is allocated to the inflorescence, which suggests that C. physodes allocates most biomass to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carex physodes; Reproduction; Dispersal pattern; Perigynium. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100213 |
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| Acolas, M; Veron, V; Jourdan, H; Begout, Marie-laure; Sabatie, M; Bagliniere, J.l.. |
| The characteristics and activity of adult allis shad [Alosa alosa (L.)] were analysed during the last part of their upstream migration in the L'Aulne, a small river in Brittany, and during reproduction on a unique spawning ground downstream of an insurmountable dam. The age of the spawners ranged front three to seven years, females being larger and older than males. Population-level migration and reproduction were studied by counting the number of migrating fish, by estimating the sex ratio, and by counting the number of nocturnal spawning acts for three consecutive years starting in 2000. The influence of the environment, especially water temperature and discharge, was highlighted: temperature during migration may supplant the influence of water flow,... |
| Tipo: Text |
Palavras-chave: Small river; Reproduction; Biological features; Anadromous migration; Allis shad. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1214.pdf |
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| Aguirre-velarde, Arturo; Thouzeau, Gerard; Jean, Frederic; Mendo, Jaime; Cueto-vega, Rosa; Kawazo-delgado, Midori; Vásquez-spencer, Jazmín; Herrera-sanchez, Diego; Vega-espinoza, Alex; Flye-sainte-marie, Jonathan. |
| The response of Argopecten purpuratus (Peruvian scallop) to environmental conditions was studied in the upwelling-influenced Bay of Paracas (Peru). Scallops growth and reproduction were monitored weekly over a 7-month period under two conditions (culture depths): on the bottom and 2 m above (suspended culture). At the same time, a high-frequency environmental monitoring was realized at the aforementioned depths. The results indicate that environmental conditions in the Bay are highly variable, especially during the summer: temperature fluctuations up to 8∘C were recorded in less than one day while oxic conditions ranged from oversaturation to anoxia. Milky-turquoise waters discoloration events (sulphide presence suspected) were simultaneously observed... |
| Tipo: Text |
Palavras-chave: Argopecten purpuratus; High frequency monitoring; Coastal upwelling; Hypoxic/anoxic conditions; Growth; Reproduction; Aquaculture; Milky-turquoise water/aguas Blancas. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00504/61547/65430.pdf |
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| Akcha, Farida; Barranger, Audrey; Bachere, Evelyne; Berthelin, C. Heude; Piquemal, D.; Alonso, P.; Sallan, R. Rondon; Dimastrogiovanni, G.; Porte, C.; Menard, Dominique; Szczybelski, A.; Benabdelmouna, Abdellah; Auffret, M.; Rouxel, Julien; Burgeot, Thierry. |
| Genitors of the Pacific oyster Crassostrea gigas were submitted during gametogenesis to a short pulse exposure to the herbicide diuron at a realistic environmental concentration. Histological analysis showed no effect of diuron on gametogenesis course, sex ratio and reproductive effort. A non-significant increase in testosterone and progesterone levels was observed in genitors exposed to the herbicide. At cell level, diuron exposure was shown to modulate the phagocytic activity of circulating hemocytes. The results of a transcriptional analysis showed that diuron affected the expression of genes belonging to functions known to play a major role during oyster gametogenesis such as gene transcription regulation, DNA replication and repair, DNA methylation... |
| Tipo: Text |
Palavras-chave: Oyster; Pesticide; Reproduction; Histology; Gene expression; RT-qPCR; Steroid; Immunity. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00309/41983/83232.pdf |
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| Allenou, Jean-pierre. |
| Afin d'apprécier le moment le plus propice pour la pose des collecteurs, le laboratoire CSRU assure un suivi de la reproduction des huîtres plates en Baie de Quiberon . Les paramètres étudiés sont la température de l'eau, l'évolution des géniteurs, le nombre et la qualité des larves dans l'eau, la fixation sur les collecteurs témoins . Les tempér atures favorables enregistrées en début de saison laissent espérer un captage correct pour cet ét é 1987. Le rôle de la température de l'eau est encore apparu prépondérant |
| Tipo: Text |
Palavras-chave: Reproduction; Huître plate; Baie de Quiberon. |
| Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/00426/53791/54699.pdf |
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| Almeida,Marcelo Nocelle de; Bessa,Elisabeth Cristina de Almeida. |
| Biological aspects of Bradybaena similaris (Férussac, 1821) were studied, such as: onset of sexual maturity, occurrence of self-fertilization, oviposition, incubation period, eclosion rate and shell length measurement at different stages of development. It was noted that in isolated B. similaris the minimum and maximum time for reaching sexual maturity were 109 and 180 days, respectively. When kept in groups, the minimum time was 78 days. The occurrence of self-fertilization was observed in 18.4% of specimens. The total number of eggs per oviposition varied from one to 38 (average: 3,5 ± 7,15), the total number of eggs per mollusc varied from one to 39 (average: 7,0 ± 10,21) and the total number of oviposition per mollusc varied form one to six (averege:... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bradybaena similaris; Biology; Growth; Reproduction. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000400010 |
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| Almeida,Marcelo Nocelle de; Bessa,Elisabeth Cristina de Almeida. |
| Biological aspects of Leptinaria unlamellata (d'Orbigny, 1835) were studied, such as: onset of sexual maturity, occurrence of self-fertilization and shell length measurement at different stages of development. In isolated specimens of L. unilamellata, sexual maturity was reached at 74 days (minimum time) and 104 days (maximum time). For the grouped specimens, the minimum time was 71 days. The occurrence of self-fertilization was observed in both species, 100% of specimens. The total numberof young per birth varied from one to 22 (average: 7,35 ± 5,78), the total number of offsprings per mollusc varied from two to eight (average: 4,1 ± 1,41) and total number of young per mollusc varied from five to 46 (average: 30,21 ± 8,08). As to the shell length in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptinaria unilamellata; Biology; Growth; Reproduction. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000400009 |
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| Alvarenga,Érika R. de; Bazzoli,Nilo; Santos,Gilmar B.; Rizzo,Elizete. |
| Reproductive biology and feeding of Curimatella lepidura (Eigenmann & Eigenmann, 1889) were studied in Juramento reservoir, São Francisco River basin, Southeastern Brazil. Histological analyses and gonadosomatic indexes revealed females and males in reproductive activity from October to March and total spawning occurring from January to March coupled with the peak of spermiating males. In the dry season, the fishes accumulated energetic reserves for reproduction during a short rainy season. The species presented sexual dimorphism, being females larger than males and sexual maturation occurring close to 7.7 cm standard length for females and 7.1 cm for males. C. lepidura presented iliophagous feeding habit, ingesting mainly sediment/detritus and a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diet; Gonadal maturation; Reproduction; São Francisco River; Spawning. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000200002 |
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| Amaral,Rodrigo S.; Lucci,Carolina M.; Rosas,Fernando C. W.; Silva,Vera M. F. da; Báo,Sônia N.. |
| This study describes the morphological, morphometric and ultrastructural characteristics of the Amazonian manatee Trichechus inunguis (Natterer, 1883) spermatozoon. The spermatozoa were obtained from a urine sample of an adult T. inunguis kept in captivity. The spermatozoa were analyzed by light and transmission electron microscopy. The head of Amazonian manatee spermatozoa had a flat oval shape and a well distinguishable midpiece. The mean dimensions of the spermatozoa were: head length, 7.49 ± 0.24 µm; head width, 3.53 ± 0.19 µm; head thickness, 1.61 ± 0.13 µm; midpiece length, 11.36 ± 0.34 µm; flagellum length, 40.91 ± 1.94 µm; total tail length, 52.16 ± 1.06 µm; total spermatozoon length, 60.08 ± 1.40 µm. The Amazonian manatee spermatozoa were similar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anatomy; Reproduction; Sirenians; Spermatozoon; Trichechus inunguis. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600025 |
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| Andrade,E.S.; Felizardo,V.O.; Murgas,L.D.S.; Drumond,M.M.; Zangerônimo,M.G.; Costa,S.F.. |
| This study evaluated the reproductive dynamics and gonadal morphology of piaparas (Leporinus obtusidens) captured downstream from the Funil Hydroelectric Power Station. The 107 piaparas evaluated were captured monthly from Sep 2006 to Aug 2007. The data were stratified among the seasons to evaluate gonad maturation and the reproductive period was determined by assessing the gonadosomatic index, hepatosomatic index, abdominal fat index (AFI), weight:length ratio, condition factor and sexual proportion. The reproductive period lasted from winter to summer (Jul-Mar) in females and from spring to autumn (Sept-Jun) in males. AFI was high during and after the reproductive period in females and only during the reproductive period in males. The highest HIS values... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish; Reproduction; Piracema; Histology; Gonad. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352013000500021 |
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| ANDRIOLI, A.; GOUVEIA, A. M. G.; PINHEIRO, R. R.. |
| A partir de 1976, importações de caprinos de raças exóticas, procedentes de vários países, buscaram a introdução de potencial genético leiteiro, tendo ocorrido também a efetiva introdução de agentes infecciosos no Brasil pela importação de caprinos sem adequados critérios sanitários, com consequente dispersão de doenças infecciosas entre os rebanhos nacionais, dentre elas a CAE - artrite encefalite caprina. Os avanços das técnicas de conservação de sêmen, aliados ao aumento da importância econ0mica da caprinocultura favorecem o seu intercâmbio nacional e internacional. Somando-se a isto, a inseminação artificial possibilita a concepção de um expressivo número de fêmeas, num curta intervalo de tempo, no entanto, pouco se sabe do risco da transição de... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: CAEV; Artrite Encefalite Caprina; Caprine arthritis encephalit virus; Semen diluents.; PCR; Caprino; Reprodução animal; Sêmen; Seleção; Transmissão de doença; Goats; Reproduction; Disease transmission; Infection.. |
| Ano: 2003 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/531309 |
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| Aparicio, B.. |
| Para producir larvas de peces con buenos rendimientos, se deben conocer los requerimientos nutricionales de la especie, particularmente en los primeros estadios larvarios. Además, se sabe que la nutrición de los reproductores influye directamente en la calidad de las larvas debido, principalmente, a la cantidad y calidad de lípidos que son transferidos desde la gónada hacia los huevos. El objetivo de este trabajo fue analizar la composición de lípidos en huevos, embriones y larvas de pez blanco de Pátzcuaro (Chirostoma estor estor) con el fin de establecer las bases de los requerimientos nutricionales de lípidos durante el desarrollo larvario del pez blanco. También se determinaron los ácidos grasos en tejidos de reproductores (cerebro, gónada, hígado,... |
| Tipo: Theses and Dissertations |
Palavras-chave: 1079; Lipids; Reproduction; Fish culture; Fish eggs; Embryos; Fish culture; Lipids; Reproduction; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_4362; Http://aims.fao.org/aos/agrovoc/c_6507. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/3465 |
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| Aranha,José Marcelo Rocha; Caramaschi,Érica Pellegrini. |
| The population structure, reproductive aspects and feeding of Phalloceros caudimaculatus (Hensel, 1868), Poecilia vivipara Bloch & Schneider (1801), Phalloptychus januarius (Hensel, 1868) e Jenynsia lineata (Jenyns, 1842) were studied in five sampling stations in the Ubatiba stream, municipality of Maricá (State of Rio de Janeiro, Brazil). In relation to the population structure, P. caudimaculatus was more representative upstream; P. vivipara mid-stream and downstream; P. januarius and J. lineata downstream. The species presented preponderance of females, except in the intermediate length classes. The occurence of imatures and females with young pointed out a long reproductive period and favoured areas for reproduction of the four species. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyprinodontiformes; Population structure; Feeding; Reproduction; Coastal stream. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000300005 |
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| Registros recuperados: 672 | |
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