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| Calliari,Danilo; Defeo,Omar; Cervetto,Guillermo; Gómez,Mónica; Giménez,Luis; Scarabino,Fabrizio; Brazeiro,Alejandro; Norbis,Walter. |
| The marine areas of Uruguay consist of the Río de la Plata estuary and the adjacent shelf and slope, part of the Subtropical Convergence Ecosystem. In this paper, the main advances in the knowledge of marine life in these areas (the known) are reviewed in order to discuss future lines of research (the unknown). Information has been separately analysed for the plankton, nekton, and benthos in each of 3 areas-the littoral, the shelfs and the "open ocean". Current knowledge of marine life is uneven among the groups and areas. In the case of the plankton, research has concentrated on the near-shore waters and focused on taxonomy and distribution. Little is known about the responses of organisms to environmental variability and about biological processes. The... |
| Tipo: Journal article |
Palavras-chave: Marine life; Biodiversity; Río de la Plata; Atlantic Ocean; Uruguay. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200015 |
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| Oddone,M. Cristina; Amorim,Alberto F. de; Mancini,Patrícia L.; Norbis,Walter. |
| Specimens of Rioraja agassizi were collected monthly off Santos, Southeast Brazil, between latitudes 23º37'S and 27º40'S, from March, 2005 to March, 2006. A total number of 278 males and 1023 females were captured. Observed depth range was 10-120 m, being the species absent above 120 m. Sex ratio significantly favored females. The entire length range of R. agassizi was observed. Females ranged in length from 16.0 to 59.4 cm and males from 13.0 to 47.2 cm. Mean female length was significantly higher than that of males. For grouped length distributions, asymmetry patterns were observed in both sexes. Length-width functions were sexually dimorphic. Males with lengths < 24.5 cm were relatively wider than females. Length-total weight curves were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Skates; Depth; Total length; Elasmobranch; Sex ratio. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300021 |
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| Orlando,Luis; Pereyra,Inés; Silveira,Santiago; Paesch,Laura; Oddone,Maria Cristina; Norbis,Walter. |
| ABSTRACT This work analyzed length-mass relationship, growth in length, mass variations and dynamic of yolk sac depletion of Mustelus schmitti embryos, extracted from females catched by the artisanal fishery acting off La Paloma (34°39'S, 54°10'W, Uruguay) during 2006 and 2007. Differences in total length and total mass between sexes were not significant. Embryos showed a negative allometric growth for both years with a slope change near the day 170 of the year, likely to be associated with the depletion of the external yolk sac. Gompertz and Von Bertalanffy curves were adjusted for each year. Parturition date was determined around the day 300 of the year. Yolk depletion followed a logistic dynamic Yt=1/(1+e(-13.749 + 0.072*t)) for 2006 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Embryo growth; Matrotrophy; Narrownose smoothhound; Reproductive mode; Southwestern Atlantic. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000400699 |
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