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| Registros recuperados: 13 | |
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| Martínez Dallos, Iván; Neira Álvarez, Mayerly; Acero P., Arturo. |
| Se analizaron algunos aspectos biológicos de los tiburones boca zapato Rhizoprionodon lalandii y R. porosus, tales como madurez y segregación sexual, índices biológicos (gonadosomático, hepatosomático y factor de condición) y contenidos estomacales. Entre los meses de septiembre y diciembre de 2007 se realizó un seguimiento de las capturas de estos tiburones a partir de los desembarcos de la pesca artesanal realizada en Isla Fuerte. Se registraron 49 individuos de R. porosus, de los cuales 55 % se clasificó como inmaduros o juveniles, y 39 de R. lalandii, de los cuales 59 % se consideró como individuos inmaduros; se observó una proporción de sexos (machos:hembras) de 9:1 en R. porosus y 1:9 en R. lalandii, dando indicios de una segregación sexual.... |
| Tipo: Journal Contribution |
Palavras-chave: Marine fish; Population characteristics; Artisanal fishing; Shark fisheries. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4439 |
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| Vranken, G.; Heip, C.H.R.. |
| The life-cycle of <i>Rhabditis marina</i> Bastian 1865 was studied at 25°C and 20 promille salinity. The following demographic parameters were computed from life-table data: the intrinsic rate of natural increase (r<sub>m</sub>) = 0.914 day; net reproductivity (R<sub>0</sub>) = 400; minimum generation time (T<sub>min</sub>) = 4.5 days; cohort generation time (T<sub>c</sub>) = 7.2 days; mean generation time (T) = 6.6 days; and the age of an adult female when a median egg is deposited (T) = 6.1 days. Several approximate equations used to estimate r<sub>m</sub> were compared with these life-table calculations. Some give erroneous estimations and should be used with extreme caution. For... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Population characteristics; Nematoda [Nematodes]; Rhabditis marina. |
| Ano: 1983 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3260 |
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| HAYES, K. M.; BARROS, C. J. da S.; SILVA, M. R. da; GASTAL, M. L.; RIBEIRO, J. F.. |
| ABSTRACT: The project "Conservation and Management of the Biodiversity of the Cerrado biome - CMBBC", chose as its regional study area, the geographical region of northeastern Goiás called Paranã-Pirineus. One of the initial tasks of this project was the socioeconomic characterization of the 34 cities and towns (municipalities) which comprise the Paranã-Pirineus regional study area. In order to compare these cities and towns and identify those most in need of assistance, four indices were constructed: a health development index, educational development index, sanitary development index and an economic development index, using data from the last Brazilian demographic census. These four indices were later combined to yield a socioeconomic development index,... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Socioeconomia; Estudo regional; Desenvolvimento socioeconômico; Característica da população; Socioeconomic; Regional study; Demographic census; Living standards.; Censo Demográfico; Cerrado; Nível de Vida.; Population characteristics; Socioeconomic development.. |
| Ano: 2004 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569013 |
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| Cornejo, S.; Daza, E.; Guzmán, L.. |
| El presente informe da cuenta de los resultados de las actividades realizadas para evaluar el estado de los bancos de ostión del sur (Chlamys vitrea), en sectores selectos de la región de Magallanes y Antártica Chilena (XII Región). Se incorporan también propuestas de administración y medidas para la recuperación de las poblaciones del recurso. Se presenta la ubicación geográfica de los bancos identificados en cada fiordo y la superficie ocupada por ellos, además de las estructuras de tamaño, tallas medias, fracción de ejemplares sobre la talla mínima legal, relación longitud peso, pesos medios, estimaciones de densidad y abundancia, además de las estimaciones de las capturas totales permisibles (CTPs). |
| Tipo: Report |
Palavras-chave: Marine molluscs; Resource management; Population characteristics; Population density; Abundance; Population structure; Population structure; Resource management; Population density; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_6524; Http://aims.fao.org/aos/agrovoc/c_6112. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1755 |
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| Ruiz, César Augusto; Zea, Sven. |
| La esponja marina Discodermia dissoluta es fuente del policétido discodermólido, un potente antitumoral que ha alcanzado fase clínica con pruebas en humanos. En Santa Marta esta especie se encuentra a menor profundidad en comparación con otras áreas del Caribe y por ello se pudieron estudiar por primera vez y por medio de buceo autónomo sus características ecológicas, abundancia y distribución. Haciendo recorridos por la base de los arrecifes (12-25 m de profundidad), se determinó que esta especie se restringe a sitios relativamente protegidos del oleaje y vive predominantemente en sustratos duros horizontales a inclinados, en general expuestos a la luz. Censos realizados a partir de círculos de 4 m de radio mostraron densidades moderadas de unos 2-5... |
| Tipo: Journal Contribution |
Palavras-chave: Sponges; Geographical distribution; Population characteristics; Caribbean. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4433 |
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| Perrotta, R.G.; Viñas, M.D.; Madirolas, A.; Reta, R.; Akselman, R.; Castro Machado, F.; Garciarena, A.D.; Macchi, G.J.; Moriondo Danovaro, P.; Llanos, V.; Urteaga, J.R.. |
| Between September 1st and 6th a research cruise was carried out in the Buenos Aires shelf area of "El Rincon" 39°40'-41°30'S, Argentine Sea SW Atlantic. The total area studied was 2,527.8 nautical mile2. Knowledge of the commercial fleet location at the time of the survey allowed to intensify sampling in a 'miniarea' of 52,8 nautical mile2. The acoustic assessment of chub mackerel (Scomber japonicus) biomass was 49,511.9 t, 94 of which corresponded to this last area. Fish samples coming from fishing trawls included only adult individuals of 240-460 mm total length (TL) and ages ranging 2-11 years. The limit age was estimated at 13 years and natural and total mortality rates at 0.23 and 0.54, respectively. Oceanographic conditions were those typical of the... |
| Tipo: Journal Contribution |
Palavras-chave: Population characteristics; Echo surveys; Mackerel fisheries; Fishery oceanography; Biomass; Environmental conditions; Fishery oceanography; Biomass; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_2938; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_32980. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/2418 |
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| Hansen, J.E.. |
| The aim of this paper was to accurately estimate population parameters of northern (“bonaerensis”, latitude < 41° S) and southern (“patagonic”, latitude 41° S) Argentine anchovy stocks and to describe some aspects of their behaviour. The research surveys allowed to obtain data on length, total weight, sex, maturity and age of 27,853 specimens of the northern and 12,787 of the southern stocks. Besides, 20,717 age determinations stemmed from commercial landing samplings of the northern stock were established. Sex proportion in the northern population was 0.50 : 0.50; the southern showed a slight predominance of males (0.52 : 0.48). Data derived from cruises and commercial landings showed statistical differences in the growth ratio of the northern stock... |
| Tipo: Journal Contribution |
Palavras-chave: Pelagic fisheries; Stocks; Population characteristics; Growth; Natural mortality; Sexual maturity; Engraulis anchoita; Marine environment. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4884 |
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| Bautil, B.R.R.. |
| Spiny lobster fishing in the Seychelles is an artisanal done essentially by skin divers operating at night in the shallow waters surrounding by the islands. Because of human population distribution lobster fishing grounds are concentrated on the inner granitic islands. In September 1992, a random stratified samoling program was set up to gather biological information from the entire granitic Mahe plateau. Direct census of fishery resources by Scuba divers swimming underwater transects was selected as the most feasible and expedient means by which to enact the Resource Survey. This report present partial result gathered for the survey around Mahe Island only and provides an estimate of the Maximum sustainable yield for the granitic plateau by extrapolation... |
| Tipo: Report |
Palavras-chave: Fishery surveys; Fishery biology; Population characteristics; Panulirus. |
| Ano: 1992 |
URL: http://hdl.handle.net/1834/5118 |
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| Castellanos Gell, J.. |
| La dispersion des poissons de récifs dépend pour une large part, de l‟existence de larves pélagiques qui peuvent être transportées au sein des courants marins loin de la population source (Cowen et coll., 2000). Ceci est mis clairement en évidence chez les espèces territoriales, celles ayant un mode de vie benthiques ou celles ayant une phase adulte avec de faibles capacités de dispersion. De l‟efficacité de ce transport dépendra donc l‟existence de populations formant un continuum, plus ou moins connectées, tout le long des zones de récifs. Toutefois, ce phénomène de dispersion est beaucoup plus complexe et implique d‟autres facteurs comme le comportement larvaire, la durée du stade larvaire pélagique, sa distribution vertical. D‟autre... |
| Tipo: Theses and Dissertations |
Palavras-chave: Reefs; Population characteristics; Aquaculture development. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/5351 |
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| Nascimento, Izabelle Silva; Santos, Josiene Maria Falcão Fraga dos; Silva, Renata Christina Souza; Santos, Danielle Melo dos; Silva, Kleber Andrade da; Araújo, Elcida de Lima. |
| O estudo foi realizado em uma área de caatinga em Pernambuco. Buscou-se avaliar a dinâmica de Croton blanchetianus em função da variação de precipitação entre estações climáticas e entre anos. Todos os indivíduos de C. blanchetianus presentes nas parcelas amostradas foram monitorados mensalmente, durante dois anos consecutivos. Houve diferença significativa de novas plântulas de C. blanchetianus entre estações e entre anos. Considerando a variação de precipitação entre anos, o comportamento da população parece ter sofrido pouca influência, pois apenas 14,8% de novas plântulas nessa população podem ser explicados pela variação de precipitação entre estações e entre anos. O poder de explicação da mortalidade pelo modelo linear generalizado foi de 1,4%,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Botânica; Engenharia Florestal; Ecologia vegetal Caatinga; Características da população; Regeneração natural Caatinga; Population characteristics; Natural regeneration. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1191 |
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| Registros recuperados: 13 | |
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