Diel variation in catches of Euphausia superba Dana 1854 early larvae: Vertical migration or avoidance reaction?
Samples were obtained with two pairs of black and white nets towed simultaneously at varying light conditions in the Weddell-Scotia confluence region. The statistical analysis (ANOVA, Regression and Kruskal-Wallis test) of the log transformed counts of Euphausia superba calyptopes larvae (CI, CII an...
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1998
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220981_v228_n1_p107_Marschoff http://hdl.handle.net/20.500.12110/paper_00220981_v228_n1_p107_Marschoff |
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paper:paper_00220981_v228_n1_p107_Marschoff2023-06-08T14:45:45Z Diel variation in catches of Euphausia superba Dana 1854 early larvae: Vertical migration or avoidance reaction? Marschoff, Enrique R. Calcagno, Javier Angel Distribution Euphausia superba Net avoidance Vertical migration avoidance reaction larva temporal variation trawling zooplankton article ecology environment larva nonhuman shrimp statistical analysis Southern Ocean Euphausia superba Euphausiacea Samples were obtained with two pairs of black and white nets towed simultaneously at varying light conditions in the Weddell-Scotia confluence region. The statistical analysis (ANOVA, Regression and Kruskal-Wallis test) of the log transformed counts of Euphausia superba calyptopes larvae (CI, CII and CIII) shows that the significant difference between the white and black nets found in daytime are not present in darkness. A negative regression coefficient was detected between the difference in catches and sun's height, pointing to a light dependent avoidance reaction. These results demonstrate that the day/night differences in observed densities of krill larvae are due to net avoidance rather than to vertical migration, a result confirmed by hydroacoustical observations; and that the habitat of these stages is restricted at all times to the upper layers of the ocean. Fil:Marschoff, E.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Calcagno, J.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220981_v228_n1_p107_Marschoff http://hdl.handle.net/20.500.12110/paper_00220981_v228_n1_p107_Marschoff |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Distribution Euphausia superba Net avoidance Vertical migration avoidance reaction larva temporal variation trawling zooplankton article ecology environment larva nonhuman shrimp statistical analysis Southern Ocean Euphausia superba Euphausiacea |
| spellingShingle |
Distribution Euphausia superba Net avoidance Vertical migration avoidance reaction larva temporal variation trawling zooplankton article ecology environment larva nonhuman shrimp statistical analysis Southern Ocean Euphausia superba Euphausiacea Marschoff, Enrique R. Calcagno, Javier Angel Diel variation in catches of Euphausia superba Dana 1854 early larvae: Vertical migration or avoidance reaction? |
| topic_facet |
Distribution Euphausia superba Net avoidance Vertical migration avoidance reaction larva temporal variation trawling zooplankton article ecology environment larva nonhuman shrimp statistical analysis Southern Ocean Euphausia superba Euphausiacea |
| description |
Samples were obtained with two pairs of black and white nets towed simultaneously at varying light conditions in the Weddell-Scotia confluence region. The statistical analysis (ANOVA, Regression and Kruskal-Wallis test) of the log transformed counts of Euphausia superba calyptopes larvae (CI, CII and CIII) shows that the significant difference between the white and black nets found in daytime are not present in darkness. A negative regression coefficient was detected between the difference in catches and sun's height, pointing to a light dependent avoidance reaction. These results demonstrate that the day/night differences in observed densities of krill larvae are due to net avoidance rather than to vertical migration, a result confirmed by hydroacoustical observations; and that the habitat of these stages is restricted at all times to the upper layers of the ocean. |
| author |
Marschoff, Enrique R. Calcagno, Javier Angel |
| author_facet |
Marschoff, Enrique R. Calcagno, Javier Angel |
| author_sort |
Marschoff, Enrique R. |
| title |
Diel variation in catches of Euphausia superba Dana 1854 early larvae: Vertical migration or avoidance reaction? |
| title_short |
Diel variation in catches of Euphausia superba Dana 1854 early larvae: Vertical migration or avoidance reaction? |
| title_full |
Diel variation in catches of Euphausia superba Dana 1854 early larvae: Vertical migration or avoidance reaction? |
| title_fullStr |
Diel variation in catches of Euphausia superba Dana 1854 early larvae: Vertical migration or avoidance reaction? |
| title_full_unstemmed |
Diel variation in catches of Euphausia superba Dana 1854 early larvae: Vertical migration or avoidance reaction? |
| title_sort |
diel variation in catches of euphausia superba dana 1854 early larvae: vertical migration or avoidance reaction? |
| publishDate |
1998 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220981_v228_n1_p107_Marschoff http://hdl.handle.net/20.500.12110/paper_00220981_v228_n1_p107_Marschoff |
| work_keys_str_mv |
AT marschoffenriquer dielvariationincatchesofeuphausiasuperbadana1854earlylarvaeverticalmigrationoravoidancereaction AT calcagnojavierangel dielvariationincatchesofeuphausiasuperbadana1854earlylarvaeverticalmigrationoravoidancereaction |
| _version_ |
1768546006719266816 |