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| Registros recuperados: 52 | |
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| Sauriau, P; Baud, Jean-pierre. |
| Based on Coulter Counter data, a new method is proposed to study the influence of the polymorphous variability in size as well as in shape of the diatom species Skeletonema costatum on the physiological performances of the Manila clam Ruditapes philippinarum . Three conditions are required in order to convert volumetric data determined with the Coulter Counter into metric data, i.e. (1) stability of the pervalvar diameter of the diatom chains, (2) statistical independence between length and pervalvar diameter of the diatom chains, and (3) negligible level of coincident passages through the aperture orifice. Under these three conditions, the mean length (l) of a S. costatum chain can be related to the mean pervalvar diameter (d) of diatom chains and to the... |
| Tipo: Text |
Palavras-chave: Bivalvia; Skeletonema costatum; Bacillariophyceae; Algae; Physiology; Biopolymorphism; Counters; Size; Size distribution; Feeding; Nutrition. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/acte-1670.pdf |
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| The principal biometric relations of juvenile Trachypenaeus similis similis and T. constrictus in Guadeloupe were calculated from 1976 to 1978. The examination of these relations yields few differences between the two species. A growth curve was established according to the sequences of modal values; these were determined according to weekly size frequency distributions over three different periods of time. In the zone studied, the growth of young Trachypenaeus is more rapid than that of the young Penaeus. |
| Tipo: Text |
Palavras-chave: Trachypenaeus; Juveniles; Size distribution; Growth curves; Biometrics. |
| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-1932.pdf |
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| Le Guen, J.c; Morizur, Yvon. |
| Length measurements on Pseudotolithus elongatus ' samples from the Congo were recorded in the 60s. Subsamples were collected in order to be "aged" by otoliths' reading. The size frequency distributions were splitted into successive unimodal distributions by different methods. Their results were compared. The results obtained from the "successive maximums' method" were similar to those from the "otoliths' reading." The programs NORMSEP and MIX gave results far more difficult to interpret biologically speaking in spite of their mathematical quality. Because many length frequency distributions of a cohort are symmetrical in nature, we suggest applying the "successive maximums' method"if there is no evidence of normality |
| Tipo: Text |
Palavras-chave: Frequency analysis; Size distribution; Pseudotolithus elongatus; Sciaenidae; Pisces. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/1989/rapport-2336.pdf |
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| Flament, P; Lepretre, A; Noel, S; Auger, Y. |
| Dix-huit prélèvements d'aérosols ont été effectués en Manche Nord, soit en bordure de mer, soit à quelques milles au large, à l'aide d'un impacteur à cascade (5 étages). L'ensemble des données (concentrations de 8 éléments répartis en 6 classes granulométriques successives) est exploité par analyse factorielle des correspondances. Celle-ci permet de mettre en évidence de larges déformations dans les spectres granulométriques pour les éléments traceurs marin et terrestre (Na et Al). En opposition, les métaux résultant d'activité anthropique (Fe, Pb, Zn, Mn), ont des comportements beaucoup plus typés. Parmi ceux-ci, la présence du manganèse sur le site paraît être indépendante de celle des autres métaux et imputable à une seule source. Pb, Fe, Zn et cuivre... |
| Tipo: Text |
Palavras-chave: Aérosols; Éléments-traces; Analyse par correspondance; Distribution granulométrique; Littoral; Aerosols; Trace elements; Correspondence analysis; Size distribution; Coastal. |
| Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/00110/22082/19723.pdf |
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| De la Garza González, J.L.; Ravalli, C.; López Greco, L.. |
| The objective of this work is to increase knowledge on the distribution and punctual density of both morphotypes of Munida gregaria in the San Jorge Gulf, Argentina. The data derived from the research cruise carried out on board of the FV Álvarez Entrena I in February 2011. Specimens of gregaria and subrugosa were caught in 37 and 73 of the 91 trawls performed, respectively. Out of the total of positive trawls, 17 were performed at depths lower than 55 m and the remaining 60 at deeper waters. The relative average abundance of both morphotypes increased significantly with regard to the two previous years (2009, 2010). M. gregaria subrugosa represented 66.4% and gregaria the remaining percentage. In the south sector of the gulf, where the highest punctual... |
| Tipo: Journal Contribution |
Palavras-chave: Biogeography; Abundance; Size distribution; Fishery surveys. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5487 |
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| Garcia de la Rosa, S.B.. |
| As a general rule, sharks and rays play an important role in the energy exchanges among higher trophic levels of the marine food chain and some of them, with an important impact as piscivorous predators. Squalus acanthias (Squalidae) and Raja flavirostris (=Dipturus chilensis )(Rajidae), are two elasmobranchs with high apparition frequencies in the SW Atlantic, in the coastal and demersal fishing trawls, co-existing and predating on the principal stocks of bony fish there located, especially the Argentine hake (Merluccius hubbsi). Both species could be transformed into alternative fishing resources, even though they are not currently commercially developed as such. The knowledge on their biology, given in great detail, will provide information for a... |
| Tipo: Theses and Dissertations |
Palavras-chave: Geographical distribution; Abundance; Size distribution; Feeding behaviour; Diets; Interspecific relationships; Predation; Food preferences; Shark fisheries; Geographical distribution; Feeding behaviour; Predation; Food preferences; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_6162; Http://aims.fao.org/aos/agrovoc/c_3024. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/1487 |
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| Carozza, C.R.; Cotrina, C.P.. |
| The study aims to discriminate juvenile and adult concentration areas of white croacker Micropogonias furnieri and striped weakfish Cynoscion striatus in two different areas: Argentine-Uruguayan Common Fishing Zone (AUCFZ) and El Rincón (Buenos Aires Prov., Argentina). The length structure and the relative abundance of these two species were analyzed with data from a research cruise carried out by R/V Dr.E.L.Holmberg during November 1994. Data of relative abundance in t/nm2 were considered to define distribution and concentration areas. 49 samples of white croaker and 41 striped weakfish from AUCFZ a, inside the area of Río de la Plata and in front of Montevideo coast, at depths lesser than 8 meters, while the adults were located in the northern coast of... |
| Tipo: Journal Contribution |
Palavras-chave: Abundance; Fishery surveys; Size distribution; Coastal fisheries; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_1696. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/2472 |
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| Perera-Pérez, O.; González-Díaz, S.P.; Álvarez Fernández, S.; González-Sanson, G.. |
| La investigación se llevó a cabo entre abril del 2006 y mayo del 2007. El objetivo fue determinar la estructura de las poblaciones de Porites astreoides, Agaricia agaricites y Acropora palmata en crestas de arrecifes de la región noroccidental de Cuba. Los indicadores ecológicos seleccionados fueron: talla media (diámetro mayor y altura), composición por clases de tallas y parámetros de la distribución de frecuencias de tallas (moda, asimetría, curtosis, desviación estándar y coeficiente de variación). Los valores medios de diámetro y altura estimados para P. astreoides en el arrecife de Los Colorados fueron superiores (11,2 ± 0,3 cm y 6,7 ± 0,2 cm, respectivamente) a los obtenidos en Playa Baracoa y Rincón de Guanabo, mientras que los de A.... |
| Tipo: Journal Contribution |
Palavras-chave: Reefs; Size distribution; Human impact; Recruitment. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4545 |
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| Rey-Villiers, N.; Alcolado, P. M.. |
| Se determinó la variación de la talla de los octocorales Eunicea flexuosa y Plexaura kuekenthali en arrecifes coralinos con diferente grado de contaminación urbana en la ciudad de La Habana, Cuba. Se midió la altura de las colonias encontradas a lo largo de un transepto de banda (100 x 1 m). La distribución por tallas de ambas especies mostró una tendencia a que las colonias alcancen una mayor frecuencia relativa en los menores intervalos de tallas en los sitios cercanos a las cuencas fluviales con mayor carga contaminante (medido por el número de fuentes contaminantes y carga dispuesta, DBO). La talla media de E. flexuosa fue significativamente menor en los dos sitios cercanos a las cuencas con mayor carga contaminante. Sus mayores tamaños de efecto... |
| Tipo: Journal Contribution |
Palavras-chave: Environmental pollution; Size distribution; Coral; Gorgoniidae; Environmental pollution; Size. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4590 |
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| Villarino, M.F.. |
| The main purpose of this paper is to describe the seasonal distribution and length structure of the Pink cuskeel Genypterus blacodes. Data from surveys carried out between 1973-1989 were used. Basic data included Pink cuskeel densities per haul, catch length structure, depth and haul position. Pink cuskeel distribution was obtained by using the same density ranges for all seasons. A cluster analysis was applied to group the individual length structure of each survey catch. All year long the principal concentrations were within 40° and 48°S. Throughout the year the adults and juveniles were present in San Jorge Gulf, Patagonia, Argentina, so bimodal distribution were obtained. In winter juveniles were located within the sector 37° and 41°S. During autumn,... |
| Tipo: Journal Contribution |
Palavras-chave: Size distribution; Geographical distribution; Fishery surveys. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/5787 |
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| Registros recuperados: 52 | |
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