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Registros recuperados: 14
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Apport des informations moléculaires et cellulaires pour la caractérisation de la résistance de l'huître plate européenne vis-à-vis de la bonamiose, et pour la détection de signatures de la sélection naturelle ArchiMer
Harrang, Estelle.
The European flat oyster, an endemic species from European coasts, has been classified in the category of "endangered and/or declining species" since 2003. Indeed, the natural beds of this oyster, consumed since ancient times, have gradually been decimated by over-exploitation and by successive emergence of parasitic diseases. The parasite that causes the disease called bonamiosis has contributed to drastically reduce the French and European aquacultural production of flat oyster. Marine bivalve molluscs display two specificities that restrict possibilities to fight against diseases: they are grown in an open environment, and possess an innate immune system lacking in adaptive response. In this context, the selection of animaIs naturally resistant to...
Tipo: Text Palavras-chave: Huître plate Européenne; Ostre edulis; Bonamiose; Bonamia ostreae; Marqueurs SNP; Expression génique; Activité hémocytaire; Cartographie de liaison; QTL; EQTL; Populations naturelles; Diversité génétique; Sélection naturelle; European flat oyster; Ostrea edulis; Bonamiosis; Bonamia ostreae; SNP markers; Gene expression; Haemocytic activity; Linkage map; QTL; EQTL; Natural populations; Genetic diversity; Genetic structure; Natural selection.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00127/23785/21702.pdf
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Bases biológicas para la evaluación y manejo de metapoblaciones de loco en la III y IV Regiones OceanDocs
González, J.; Tapia, C.; Wilson, A.; Stotz, W.; Orensanz, J.M.; Parma, A.M.; Valero, J.; Catrilao, M.; Garrido, J..
En la III y IV Regiones las áreas de manejo y explotación de recursos bentónicos (AMERB) se han establecido como la principal herramienta de manejo del recurso loco (Concholepas concholepas). Sin embargo, su aplicabilidad para la administración y aporte en términos del desarrollo sustentable, aunque sugerentes, requieren de una evaluación objetiva, en cuanto al manejo de carácter discreto que se ha establecido para cada AMERB, desconociendo la eventual interacción espacial de las mismas. En este marco, se desarrolla una aproximación para evaluar el desempeño de las AMERBs desde una perspectiva integral bajo un enfoque metapoblacional. Si bien el estudio está orientado a proporcionar la información de campo que permita probar la hipótesis de metapoblaciones...
Tipo: Report Palavras-chave: Natural populations; Fishery resources; Exploitation; Resource management; Benthos; Benthos; Fishery resources; Resource management; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_2942; Http://aims.fao.org/aos/agrovoc/c_6524.
Ano: 2005 URL: http://hdl.handle.net/1834/1754
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Divergence genetique de quelques populations naturelles de Cepaea nemoralis et Cepaea hortensis en France ArchiMer
Guiller, A; Madec, L.
Electrophoretic analysis of eight polymorphic loci in 23 mixed or monospecific populations of Cepaea nemoralis and Cepaea hortensis indicates important genetic dissimilarities between Breton and Pyrenean areas. The concordance between groups of samples and various latitudinal or altitudinal zones suggests that the influence of climatic factors could be involved. Founder effects also seem to increase the differentiation in some populations; the lower genetic variability in three pyrenean samples probably submitted to frequent extinctions could illustrate this process. Nevertheless, divergences corresponding to plurispecific samples suppose the absence of interactions between the two species.
Tipo: Text Palavras-chave: Mollusca; Cepaea hortensis; Cepaea nemoralis; Climate; Electrophoresis; Natural populations; Genetics.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-1714.pdf
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Endosperm genotyping as a strategy to differentiate the allele source in maize heterozygous progeny PAB
Martins,Francielle Alline; Carneiro,Pedro Crescêncio Souza; Cruz,Cosme Damião; Carneiro,José Eustáquio de Souza; Guimarães,Claudia Teixeira.
The objective of this work was to distinguish the parental source of alleles in heterozygous progeny using semiquantitative polymerase chain reaction (PCR) in maize endosperm. Endosperms derived from direct and reciprocal single-cross hybrids between maize inbred lines L3 and L1113-01 were genotyped by semiquantitative PCR methodology (SQ-PCR) using fluorescent microsatellite primers. The amplification products were evaluated by the ratios of fluorescence intensity (RFI), calculated between the peaks corresponding to the alleles derived from each parental line. Based on the statistically significant contrast between RFI mean values of direct and reciprocal single-cross hybrids, it was possible to distinguish the number of alleles received from each...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Allelic origin; Heterozygote; Natural populations; Polygenes; Semiquantitative PCR.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009001000012
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Estudio de la dieta, preferencia e incidencia del canibalismo en la población de merluza (Merluccius hubbsi) en el frente oceánico del Río de la Plata OceanDocs
Galli Beduchaud, O.M..
La merluza (Merluccius hubbsi) es el más importante de los recursos pesqueros del Océano Atrántico Sudoccidental, y se distribuye desde la latitud 25º 00'S (Cabo Frío, Brasil) hasta más al sur de la latitud 48º 00'S (Plataforma patagónica, Argentina). Dentro de su área de distribución, realiza migraciones estacionales a lo largo de un ciclo anual de carácter trófico - reproductivo, directamente influenciadas por la cirulación hidrográfica de la Corriente de Malvinas. Las especies alimento de la merluza se hallan distribuidas en su mayoría en la columna de agua, resultando así, que el alimento proviene casi en su totalidad de las comunidades pelágica y demersal - pelágica, lo que induce a calificar a la merluza como una especie con hábitos de predación...
Tipo: Theses and Dissertations Palavras-chave: Diets; Natural populations; Mortality causes.
Ano: 2002 URL: http://hdl.handle.net/1834/2882
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Estudio de las poblaciones de caballitos de mar en dos zonas de la costa norte de La Habana y Pinar del Río, Cuba OceanDocs
Piloto-Cubero, Y.; Pastor-Gutiérrez, L.; Corrada-Wong, R.I.; Chevalier-Monteagudo, P.P..
Se presentan los resultados sobre el estudio de las poblaciones de caballitos de mar en dos estaciones ubicadas en la costa norte de La Habana y Pinar del Río, Cuba. Se llevaron a cabo censos visuales mediante buceo libre, utilizando el método de transectos lineales, entre los meses de abril del 2004 y junio del 2005. Se obtuvieron la densidad media para las especies Hippocampus reidi (Ginsburg, 1933) e Hippocampus erectus (Perry, 1810), así como la densidad media por estaciones y por época del año. La especie H. reidi fue la más abundante y la mayor densidad se encontró en la estación de Las Cuarenta 0.0109 ind/m2. No se encontraron diferencias entre la densidad en época de lluvia y seca para las especies. Los machos y las hembras de H. reidi mostraron...
Tipo: Journal Contribution Palavras-chave: Population abundance (in number); Natural populations; Marine fish.
Ano: 2011 URL: http://hdl.handle.net/1834/4168
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Etude cytologique ultrastructurale des anomalies hepatiques du loup, de la daurade, et de l'anguille, induites par une alimentation artificielle ArchiMer
Bac, N; Biagianti, S; Brusle, J.
In the three species Dicentrarchus labrax, Sparus auratus , and Anguilla anguilla an artificial feeding (dry pellets) disturbs liver cells as revealed at ultrastructural level. In hepatocytes, anomalies consist of lipids storage (liposomes) considered as deviation in fatty acids metabolism. Moreover are observed cellular alterations (mitochondrial vacuolization, nuclear pycnosis) related to degenerative process. It is of great interest to understand wether liver modifications are just a reaction to an unbalanced feeding or a true trophic pathology.
Tipo: Text Palavras-chave: Dicentrarchus labrax; Serranidae; Pisces; Natural populations; Fish culture; Lipids; Fatty acids; Cytology; Ultrastructure; Cells; Diseases; Pellet feeds; Metabolism; Liver; Artificial feeding; Nutrition disorders.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/acte-1250.pdf
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Factorial analysis of bootstrap variances of population genetic parameter estimates Genet. Mol. Biol.
Carlini-Garcia,Luciana Aparecida; Vencovsky,Roland; Coelho,Alexandre Siqueira Guedes.
We presented an alternative way to verify the relative contribution to the total variance, of the sources of variation due to populations (P), individuals within populations (I), the (P*I) interaction, and the standard error of the following parameter estimates: total (F) and intrapopulation (f) fixation indices, and divergence among populations (q). The knowledge of this relative contribution is important to establish sampling strategies of natural populations. To attain these objectives, the bootstrap method was used to resample simultaneously populations and individuals, considering different combinations of P and I. This procedure was repeated five times for a given combination of each analyzed data set. For each data set, five estimates of these...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Population structure; Resampling; Natural populations.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200019
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Genetic Variability Between two provenances of açaizeiro (Euterpe oleracea Martus) PFB - Pesquisa Florestal Brasileira
Farias Neto, João Tomé de; Müller, Antônio Agostinho; Oliveira, Maria do Socorro Padilha de; Santo, Dewis Eduardo Silva do Espirito; Silva, Mirna Rafaela Almeida da.
The objective of this work is to generate information about the distribution of the levels of genetic variability in two provenances of Euterpe oleracea. A sample of seeds of each individual from distinct regions had been collected at Curralinho and Limoeiro of Ajuru, localities of Pará State placed on the Estuary of Amazon river. The experiment was installed in randomized blocks with two replications and five plants per plot. Seedlings were evaluated, at 10 months of age for: height, diameter and number of leaves. Significant genetic variations between provenances for number of leaves were detected. Curralinho provenance presented greater genetic variability than Limoeiro do Ajuru. Small levels of coefficients of genetic variation among provenances shows...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic variation; Natural populations; Genetic parameter Variação genética; Populações naturais; Parâmetros genéticos.
Ano: 2003 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1622
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Influence de la temperature sur la differentiation sexuelle des gonades chez la tortue luth (Dermochelys coriacea ); etude en incubation artificielle et naturelle ArchiMer
Rimblot, F; Fretey, J; Lescure, J; Pieau, C.
Sexual differentiation of the marine leatherback turtle is sensitive to temperature. Incubation of eggs below 29 degree C results in 100% males, whereas incubationa bove 30 degree C results in 100% potential females at hatching. Therefore, the threshold temperature lies between 29 and 30 degree C as has been found for other marine turtles (Caretta caretta, Chelonia mydas ). Among hatchlings from natural nests in French Guiana, 10% were males, 20% were potential females and 70% had an intermediate phenotype. The sand temperature at 60 cm of depth, near one nest, was recorded and was found to vary between 29 and 30 degree C during the presumed thermosensitive period. These results will be useful to marine turtle hatcheries which seek to manipulate sex ratios...
Tipo: Text Palavras-chave: Dermochelys coriacea; Chelonia mydas; Reptilia; Hatcheries; Natural populations; Incubation; Turtle culture; Eggs; Temperature effects; Sexual dimorphism.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/acte-1241.pdf
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On the relative abundance of natural populations OMA
Heip, C.H.R..
The constant and similar statistical variability shown by various aquatic populations is postulated to be a result of competition for space. When competition for space occurs, numbers of species should form a series of abundance in which two adjacent species differ by a factor which at closest packing is 1.27. This hypothesis is tested by comparing different communities where competition for space is expected to occur (marine phytoplankton) or not (brackish water copepods).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Natural populations; Relative abundance.
Ano: 1976 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3549
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Report of the study group on pollution affecting shellfish in aquaculture and natural populations - 1991 ArchiMer
Heral, Maurice; Meixner, R.; Spencer, B.; Walsh, G.; Worms, J..
This document is a report of a Study Group of the International Council for the Exploration of the Sea and does not necessarily represent the views of the Council. Therefore it should not he quoted without consultation with the General Secretary.
Tipo: Text Palavras-chave: Natural populations; Aquaculture; Shellfish; Pollution; Populations naturelles; Aquaculture; Coquillages; Pollution.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-3048.pdf
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Variance additivity of genetic populational parameter estimates obtained through bootstrapping Scientia Agricola
Carlini-Garcia,Luciana Aparecida; Vencovsky,Roland; Coelho,Alexandre Siqueira Guedes.
Studying the genetic structure of natural populations is very important for conservation and use of the genetic variability available in nature. This research is related to genetic population structure analysis using real and simulated molecular data. To obtain variance estimates of pertinent parameters, the bootstrap resampling procedure was applied over different sampling units, namely: individuals within populations (I), populations (P), and individuals and populations simultaneously (I, P). The considered parameters were: the total fixation index (F or F IT), the fixation index within populations (f or F IS) and the divergence among populations or intrapopulation coancestry (theta or F ST). The aim of this research was to verify if the variance...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Population structure; Resampling; Molecular markers; Natural populations; Simulation.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100015
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Variations in lipid classes and fatty acid content in tissues of wild <i>Macrobrachium rosenbergii</i> (de Man) females during maturation OMA
Cavalli, R.O.; Tamtin, M.; Lavens, P.; Sorgeloos, P..
This study describes the variations in total lipid, lipid classes and fatty acids in the midgut gland (MG), ovary, and muscle tissue of wild-caught <i>Macrobrachium rosenbergii</i> to elucidate the importance of these components during sexual maturation. Mature females were captured in the Mae Klong River, Thailand, from July to September 1998, and divided into five groups according to their ovarian development. Total lipid levels in the ovary increased with maturation, but no concomitant decrease in MG lipids was observed. Thus, the lipid requirements of the developing ovary are thought to be more dependent on the immediate ingestion of dietary lipid than on MG reserves. Higher proportions of neutral lipids (NL), mainly triacylglycerols (TG),...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biochemical composition; Fatty acids; Lipids; Muscles; Natural populations; Ovaries; Polyunsaturated fatty acids; Prawn culture; Sexual maturity; Macrobrachium rosenbergii; Thailand.
Ano: 2001 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6923
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