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Registros recuperados: 14
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Aspectos biológicos de Rhizoprionodon lalandii y Rhizoprionodon porosus (Carcharhinidae - Carcharhiniformes) capturados mediante la pesca artesanal en isla Fuerte, Caribe colombiano OceanDocs
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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Calculation of the intrinsic rate of natural increase, r<sub>m</sub>, with <i>Rhabditis marina</i> Bastian 1865 (Nematoda) OMA
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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Construção de indicadores de desenvolvimento social. Infoteca-e
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; Cerrado; Desenvolvimento socioeconômico; Característica da população; Censo demográfico; Nível de vida; Socioeconomic; Regional study; Socioeconomic development; Population characteristics; Demographic census; Living standards.
Ano: 2004 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/569013
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Crecimiento del abanico de mar Gorgonia ventalina (Linnaeus, 1758) (Cnidaria: Gorgoniidae) en el área de Santa Marta, Caribe colombiano OceanDocs
Manrique Rodríguez, N.; Bejarano Chavarro, S.; Garzón Ferreira, J..
As a contribution to the biological knowledge about the sea fan Gorgonia ventalina and the use of this information as a tool to generate conservation and management strategies for this threatened species, a study about its annual growth rate, in different reef areas in Santa Marta and the National Natural Park Tayrona in the Colombian Caribbean took place. Manual measurements of 35 colonies were analyzed and images of 11 colonies were recorded in the beginning and in the end of the field stage. The annual growth rate varies among colonies and areas where measurements were taken. The average annual growth rate obtained with both of the methods was high and oscillated between 7.6 and 8.1 cm/year in height and between 6.9 and 8.3 cm/year wide. The total area...
Tipo: Journal Contribution Palavras-chave: Growth; Population characteristics; Population structure; Growth; Population structure; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2006 URL: http://hdl.handle.net/1834/1981
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Diagnóstico del recurso ostión del sur OceanDocs
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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Diagnóstico socioeconômico dos municípios goianos da Região Paranã-Pirineus. Infoteca-e
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. Using data from the last Brazilian demographic census, the 34 towns were evaluated considering the following items: population characteristics; education; income; housing characteristics; basic sanitation conditions; health; economic characteristics; number of agricultural establishments and land-use on such establishment; and the characteristics of agriculture in the region....
Tipo: Documentos (INFOTECA-E) Palavras-chave: Socioeconomia; Estudo regional; Goiás; Brasil; Desenvolvimento sustentável; Característica da população; Censo demográfico; Nível de vida; Socioeconomic; Regional study; Brazil; Sustainability; Population characteristics; Demographic census; Living standards.
Ano: 2004 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/568051
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Estudio biométrico, estructura poblacional y habitat del camarón Penaeus vannamei, Boone en criaderos OceanDocs
Reinoso, B..
The present work is about biometry study, population structure and habitat Penaeus vannamei, Boone shrimp cultivated in ponds 939 shrimps were analised from March-July 1991 at a shrimp farm located in Hebano-Manabí port. The analysis demostrated that a strong difference exists between the male and female shrimp product of morphological diformis in this species. Also, the calculated correlation coeficient values were always near the unit indicated for us that the relations between the different averages were very narrow. The proportion of the sexes showed a clear predominance of the females over the males. The proportions being 60%/40% respectively. Aside from this, this population distribution remained steady during the period of the investigation. The...
Tipo: Journal Contribution Palavras-chave: Biometrics; Habitat; Population characteristics; Breeding; Crustacean culture; Length-weight relationships; Breeding; Crustacean culture; Http://aims.fao.org/aos/agrovoc/c_49902; Http://aims.fao.org/aos/agrovoc/c_1985.
Ano: 1993 URL: http://hdl.handle.net/1834/3048
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Historia natural de la esponja discodermia (Porifera: Demospongiae: Lithistida) en Santa Marta, Caribe colombiano OceanDocs
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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La caballa (Scomber japonicus) y las condiciones del ambiente en elárea "El Rincón" 39°40'-41°30'S del Mar Argentino. Septiembre 2000 OceanDocs
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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Le ceteau Dicologoglossa cunetata (Moreau), sa biologie et sa peche dans le sud du golfe de Gasgogne. ArchiMer
Forest, A.
This study deals with D.cuneata, a small soleid listed among the spp of NEAFC Recommendation 2 and exploited by the 'artisanal' trawlers in the South of the Bay of Biscay. The gonads/gutted fish wt ratio has been calculated throughout a yr, and shows that young Dicologoglossa are able to reproduce at age-group II. Spawning takes place during the 3rd quarter. Growth has been determined by otolith reading and length frequency analysis; Bertalanffy's and Gompertz's equations parameters have been studied, and attempts to estimate the instantaneous rate of total mortality have been made. The results are: male Z 3-5=0.74 and 0.83, female Z 3-5=0.96 and 1.35. Selectivity experiments carried out on board of R/V 'La Palagia' give a selection factor of 3.9. The...
Tipo: Text Palavras-chave: Microchirus; Dicologoglossa cuneata; Population structure; Gear selectivity; Total mortality; Population characteristics; Fishing effort; Artisanal fishing; Reproductive organs; Growth; Fishery statistics.
Ano: 1975 URL: http://archimer.ifremer.fr/doc/1975/publication-2003.pdf
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Parámetros biológicos relevantes para las pesquerías de anchoíta argentina (Engraulis anchoita). Estimaciones resultantes de reunir datos de campañas de investigación (1993 a 2008) y de muestras de capturas comerciales (1986 a 2009) OceanDocs
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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Results of a spiny lobster survey around Mahe Island during September and October 1991 OceanDocs
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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Structure génétique des populations de trois espèces de poissons de récifs cubains : Stegastes partitus, Haemulon flavolineatum et Acanthurus tractus. OceanDocs
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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Variação sazonal e interanual na dinâmica populacional de Croton blanchetianus em uma floresta tropical seca PFB - Pesquisa Florestal Brasileira
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
Registros recuperados: 14
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