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| Registros recuperados: 160 | |
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| Rivas Valencia, Patricia. |
| RESUMEN La tristeza es causada por un complejo viral constituido por diversos haplotipos (hps) del Citrus tristeza virus (CTV). El objetivo fue realizar un análisis de la estructura poblacional en diferentes escenarios epidémicos: a) En Yucatán, México, en condiciones asintomáticas (As) y con presencia de T. citricida (Tc), vector asociado a aislamientos de tipo severo; y en Tamaulipas en condiciones As y sin Tc. b) En Brasil, en condiciones As y sintomáticas (s), en regiones con y sin muerte súbita de los cítricos (MSC), síndrome atribuible a una nueva variante severa del CTV. Se estudiaron las secuencias génicas p25 y p27 de la capa proteica viral. En México, con SSCP se demostró una estructura poblacional compleja en Tamaulipas, con 7... |
| Tipo: Tesis |
Palavras-chave: SSCP; Muerte súbita de los cítricos; Estructura poblacional SSCP; Citrus sudden death; Population structure. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1061 |
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| Apín, Y. C.; Ocaña, F. A.; Cala de la Hera, Y. R.; Gómez, L. M.. |
| El género Emerita es muy común en playas de arena, donde juega un importante papel en las tramas tróficas. En este trabajo se caracteriza la estructura poblacional de Emerita sp. en playa Levisa, Granma, Cuba. Se analizan variables como la densidad poblacional, biomasa, talla de los individuos, así como abundancia de hembras fresadas y la talla mínima de las hembras ovígeras, en cuatro estaciones de muestreo. El valor más elevado de la densidad total fue de 188.3 ind. m-2 en el mes de octubre, mientras que en julio se obtuvo la mayor densidad de hembras ovígeras con un valor de 40 ind. m-2. Los valores de biomasa total (húmeda) oscilaron entre 14.5 g m-2 y 37.7 g m-2. Se clasificaron los individuos por tallas en 18 intervalos de clase, presentando... |
| Tipo: Preprint |
Palavras-chave: Population structure; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/3634 |
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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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| Oliveira,Edinulva; Masunari,Setuko. |
| Population structure of the porcelain crab Petrolisthes armatus (Gibbes, 1850) from the rocky shore of the Farol isle (25º51'S, 48º32'W) was carried out in the following aspects: annual fluctuation of the density, distribution of the developmental stages and sexes over year round, size composition and recruiting period of juveniles into the population. Monthly collections were made in the three sites of the midlittoral, from November/89 to April/91, with the aid of a trap. The air temperature ranged from 13ºC to 28ºC, that of the surface water from 16ºC lo 29ºC and the salinity of the surface water from 06.7 to 31.5. A total of 5.585 individuals of Petrolisthes armatus was collected, among which, 116 were in the megalopa stage, 1,579 juveniles, 830... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crustacea; Petrolisthes armatus; Population structure; Farol Isle; Paraná; Brazil. |
| Ano: 1995 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000200014 |
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| Branco,Joaquim Olinto; Lunardon-Branco,Maria José; Souto,Flávio Xavier. |
| Portunus spinimanus Latreille, 1819 is one abundant Portunidae speeies whieh are eaught by sea-bob-shrimps artisanal fishery in Armaçãodo Itapoeoroy,Penha, Santa Catarina, Brazil. Aiming to analyze its population strueture, a total of 995 males and 1925 fernaleswere eollected by means of overtrawl frorn January to Decernber 1995, between the depthsof 610 10meters,in lhe periodsof morning,afternoonand evening. The width variation of lhe carapaee ranged írom 3.0 to 14.0 em in the males and 3.0 to 11.0emin females. The species presents growth isometric and the males reach width and weight assintoticand bigger that lhe females.The estirnatedfirst maturation width was between 6.8 and 7.6 em, reached with lhe approxirnated age of 15 months. The artisanal fishery... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Portunus spinimanus; Population structure; Artisanal fishery. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000300010 |
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| Branco,Joaquim Olinto; Lunardon-Branco,Maria José; Souto,Flávio Xavier; Guerra,Cláudio Rogério. |
| Xiphopenaeus kroyeri is the most exploited shrimp specie along Center-South coast of Santa Catarina State, Brazil, by artisanal fishery. In the period from March/1996 to February/1997, 3965 shrimps were collected (1843 males and 2122 females) sampled by over-trawl, with the depth oscillating between 5 and 15 meters. Xiphopenaeus kroyeri shows seasonal fluctuations in its abundance with higher rates in autumn. The population's average total-length varied between 7.5cm and 9.1cm, and the presence of juveniles was common along the year. The males and females get to the first gonadal maturation with 7.4 cm and 9.0 cm length, respectively; these lengths were reached within 6 and 8 months of age. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Xiphopenaeus kroyeri; Population structure; Sea-bob-shrimp. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000100016 |
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| Villarino, M.F.; Simonazzi, M.A.; Bambill, G.A.; Ibañez, P.M.; Castrucci, R.; Reta, R.. |
| This report contains the objectives, data collected and results from a hake assessment survey carried out in the Argentine Sea between 34° and 46° S, during July and August 1994, on board of the R/Vs "Dr. E. L. Holmberg" and "Cap. Oca Balda". The main objectives of the survey were: 1) to estimate total biomass and total abundance per age class; 2) to study the size and age composition; 3) to define the maturity ogive per size and age; 4) to quantitatively determine cannibalism and predation indexes. The area covered by the survey where 149 trawls and 184 oceanographic stations were performed was close to 100,440 nm2 . Hake biomass between 34° and 46° S was estimated in 1,105,284 tons and the confidence interval at 95. was ± 23.12. . Most of the biomass... |
| Tipo: Journal Contribution |
Palavras-chave: Stock assessment; Abundance; Biomass; Fishery surveys; Population structure; Stock assessment; Biomass; Population structure; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6115. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/2591 |
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| Lillo, S.; Céspedes, R.; Díaz, E.; Ojeda, V.. |
| El presente estudio tiene como objetivo evaluar el stock de merluza de tres aletas (Micromesistius australis) a través del método hidroacústico, entre las latitudes 47º y 51º Sur. Como parte del proyecto, se realizó entre el 2 y el 15 de agosto del 2003 a bordo del B/C “Abate Molina” un crucero de prospección dirigido a evaluar mediante un método de evaluación directa (evaluación acústica) su biomasa, abundancia y distribución, estimar la importancia relativa de la fauna acompañante, condiciones reproductivas y tróficas del stock. Durante el estudio se realizaron 13 lances de pesca y 49 transectas acústicas. Los resultados muestran que la merluza de tres aletas se distribuyó asociada al borde de la plataforma y talud continental, con una biomasa estimada... |
| Tipo: Report |
Palavras-chave: Stock assessment; Biomass; Population structure; Age composition; Geographical distribution; Acoustic equipment; Stock assessment; Biomass; Population structure; Age composition; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_5083. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1698 |
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| Wang,Xiao-Qiang; Kwon,Soon-Wook; Park,Yong-Jin. |
| Background: In order to evaluate the variation among different rice types, the genetic diversity in a rice collection composed by 59 breeding lines, 23 landraces, 18 weedy rice lines, and 35 introduced lines that collected from countries worldwide was analyzed using 134 simple sequence repeat markers. Results: In total, 1264 alleles were identified (average, 9.43 per locus). Rare alleles made up a large portion (58.4%) of the detected alleles, and 29 unique alleles associated with rice accessions were also discovered. A model-based structural analysis revealed the presence of three subpopulations. The genetic relationships revealed by the neighbour-joining tree method were fairly consistent with the structure-based membership assignments for most of the... |
| Tipo: Journal article |
Palavras-chave: Landraces; Linkage disequilibrium; Population structure; Rice; Simple sequence repeats. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500011 |
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| 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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| Cleary, Daniel F.R.; Descimon, Henri; Menken, Steph B.J.. |
| Clear habitat separation between the sister species Colias alfacariensis and C. hyale is shown when occurring sympatrically. Colias hyale is found more often in moist cultivated pastures while Colias alfacariensis is more abundant in dry uncultivated habitat. Out of a total of 16 loci, no diagnostic loci were found between C. alfacariensis and C. hyale, and both species shared most major polymorphisms. Exceptions were the marked differences in allele frequencies at the HK locus and only C, hyale, but not C. alfacariensis was further invariable at the GOT2 locus, which is usually highly polymorphic in the Pieridae. Colias hyale has a significantly lower level of heterozygosity than its sister species C. alfacariensis. In Colias alfacariensis heterozygosity... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Lepidoptera; Pieridae; Allozymes; Population structure; Gene flow. |
| Ano: 2002 |
URL: http://www.repository.naturalis.nl/record/534385 |
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| Brbaklić,Ljiljana; Trkulja,Dragana; Kondić-Špika,Ankica; Hristov,Nikola; Denčić,Srbislav; Mikić,Sanja; Tomičić,Marina; Kobiljski,Borislav. |
| The objective of this work was to assess the genetic diversity and population structure of wheat genotypes, to detect significant and stable genetic associations, as well as to evaluate the efficiency of statistical models to identify chromosome regions responsible for the expression of spike-related traits. Eight important spike characteristics were measured during five growing seasons in Serbia. A set of 30 microsatellite markers positioned near important agronomic loci was used to evaluate genetic diversity, resulting in a total of 349 alleles. The marker-trait associations were analyzed using the general linear and mixed linear models. The results obtained for number of allelic variants per locus (11.5), average polymorphic information content value... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum; Genetic resources; Microsatellites; Population structure; Spike-related traits.. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000200149 |
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| Oliveira,Rejane Rodrigues de; Egito,Andréa Alves do; Ribeiro,Maria Norma; Paiva,Samuel Rezende; Albuquerque,Maria do Socorro Maués; Castro,Silvia Ribeiro; Mariante,Arthur da Silva; Adrião,Manuel. |
| The objective of this study was to verify the genetic diversity between and within seven populations of Moxotó goat (n = 264) from the States of Pernambuco, Paraíba and Rio Grande do Norte, using RAPD (Random Amplified Polymorphic DNA). Moxotó, as well as other naturalized breeds, suffers genetic losses due to the indiscriminate miscegenation with breeds raised in the Northeast Region of Brazil. The genetic characterization of these genetic resources is essential to conservation and breeding programs. DNA was extracted from lymphocytes using a non-organic protocol. The 16 primers used were selected from 120 decamer oligonucleotide primers and generated 56 polymorphic bands. The analysis of molecular variance (AMOVA) showed that the greater part of total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capra hircus; Native breeds; Population structure; Conservation genetics. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000300006 |
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| Registros recuperados: 160 | |
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