Distribución del efectivo norte (34° S-41° S) de merluza (Merluccius hubbsi Marini, 1933) en relación con parámetros ambientales durante fines del invierno (2000-2008)
Abundance fluctuation per size range in hake distribution and its relation to bottom temperature and salinity variation during August-October 2000-2008 was analyzed (Argentine Sea, Buenos Aires province). Interannual variation showed positive temperature anomalies in 2004 and 2005 and negative ones in 2003 and 2007. It was not significant in salinity. No clear relation was found between oceanographic parameters and recruitment; nevertheless, the analysis of hierarchic grouping per size allowed to establish four groups whose spatial distribution could be associated to different oceanographic conditions. Individuals below 18 cm and between 18 and 30 cm length showed the highest abundance between 35° S-37° S, at 80-130 m depth, 8° C-10° C temperature and 33.5-34.0 salinity. The area presents a large spatial variation in temperature and strong sea bottom thermohaline ranges. These size groups showed another focus of lower density around 40° S. Individuals between 31-40 cm were found in the whole study area and specimens above 40 cm south of 38° S at higher depths, close to the 80-200 shelf-break where thermohaline ranges averaged 6° C-8° C and 33.75-34.00.
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Spanish / Castilian |
| Published: |
2014
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| Subjects: | Merlucciidae, Merluccius hubbsi, Merluza, Efectivos, Distribución geográfica, Campos de temperatura, Gradientes de salinidad, Pesquería de gádidos, Marine environment, ASFA15::S::Stocks, ASFA15::G::Geographical distribution, ASFA15::T::Temperature fields, ASFA15::S::Salinity gradients, ASFA15::G::Gadoid fisheries, |
| Online Access: | http://hdl.handle.net/1834/6775 |
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| Summary: | Abundance fluctuation per size range in hake distribution and its relation to bottom temperature and salinity variation during August-October 2000-2008 was analyzed (Argentine Sea, Buenos Aires province). Interannual variation showed positive temperature anomalies in 2004 and 2005 and negative ones in 2003 and 2007. It was not significant in salinity. No clear relation was found between oceanographic parameters and recruitment; nevertheless, the analysis of hierarchic grouping per size allowed to establish four groups whose spatial distribution could be associated to different oceanographic conditions. Individuals below 18 cm and between 18 and 30 cm length showed the highest abundance between 35° S-37° S, at 80-130 m depth, 8° C-10° C temperature and 33.5-34.0 salinity. The area presents a large spatial variation in temperature and strong sea bottom thermohaline ranges. These size groups showed another focus of lower density around 40° S. Individuals between 31-40 cm were found in the whole study area and specimens above 40 cm south of 38° S at higher depths, close to the 80-200 shelf-break where thermohaline ranges averaged 6° C-8° C and 33.75-34.00. |
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