Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean
Abstract: In frontal systems, larvaceans generally comprise a significant fraction of the mesozooplankton. Given the low mobility of these organisms, their vertical distribution is directly influenced by the physical conditions of the water column. The main goal of this study was to investigate the...
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2015
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17451000_v11_n6_p633_Spinelli http://hdl.handle.net/20.500.12110/paper_17451000_v11_n6_p633_Spinelli |
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paper:paper_17451000_v11_n6_p633_Spinelli2023-06-08T16:28:17Z Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean Larvaceans oceanographic conditions SW Atlantic Ocean tidal front vertical distribution estuarine front fractionation front intertidal environment invertebrate larva oceanography spawning stabilization turbulent mixing vertical distribution vertical movement water column Atlantic Ocean Atlantic Ocean (Southwest) Patagonia Appendicularia (class) Oikopleura dioica Abstract: In frontal systems, larvaceans generally comprise a significant fraction of the mesozooplankton. Given the low mobility of these organisms, their vertical distribution is directly influenced by the physical conditions of the water column. The main goal of this study was to investigate the day and night vertical distribution of the larvaceans Oikopleura dioica in the different sectors of the Península Valdés tidal front (42°–45°S; SW Atlantic Ocean), focusing on possible causes such as oceanographic conditions (well-mixed, frontal and stratified), feeding activities, reproductive behaviour and predation risks. Day and night samples were collected with a MultiNet of 67 µm and 300 µm mesh size, from two depth layers. Conductivity-temperature-depth (CTD) profiles were also recorded. In the well-mixed waters, the size structure of O. dioica was similar in the upper and lower layers both in the day and night samples, probably due to the continuous vertical movement caused by the turbulent mixing of waters. In the frontal and stratified areas, mature animals were found in the upper layers during the night, possibly due to their aggregation in surface waters for synchronized spawning. In these areas, a high percentage of well-fed larvaceans was also found. Principal component analysis showed that, at night, the abundance of potential predators such as chaetognaths, ctenophores and anchovy larvae was correlated with the parameter of stability of the water column (Simpson parameter), and that these were more abundant in the upper layers of the stratified area containing larvaceans. Our results suggest that the degree of stratification of the water column was the main factor affecting the vertical distribution of O. dioica. © 2015, Taylor & Francis. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17451000_v11_n6_p633_Spinelli http://hdl.handle.net/20.500.12110/paper_17451000_v11_n6_p633_Spinelli |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Larvaceans oceanographic conditions SW Atlantic Ocean tidal front vertical distribution estuarine front fractionation front intertidal environment invertebrate larva oceanography spawning stabilization turbulent mixing vertical distribution vertical movement water column Atlantic Ocean Atlantic Ocean (Southwest) Patagonia Appendicularia (class) Oikopleura dioica |
| spellingShingle |
Larvaceans oceanographic conditions SW Atlantic Ocean tidal front vertical distribution estuarine front fractionation front intertidal environment invertebrate larva oceanography spawning stabilization turbulent mixing vertical distribution vertical movement water column Atlantic Ocean Atlantic Ocean (Southwest) Patagonia Appendicularia (class) Oikopleura dioica Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean |
| topic_facet |
Larvaceans oceanographic conditions SW Atlantic Ocean tidal front vertical distribution estuarine front fractionation front intertidal environment invertebrate larva oceanography spawning stabilization turbulent mixing vertical distribution vertical movement water column Atlantic Ocean Atlantic Ocean (Southwest) Patagonia Appendicularia (class) Oikopleura dioica |
| description |
Abstract: In frontal systems, larvaceans generally comprise a significant fraction of the mesozooplankton. Given the low mobility of these organisms, their vertical distribution is directly influenced by the physical conditions of the water column. The main goal of this study was to investigate the day and night vertical distribution of the larvaceans Oikopleura dioica in the different sectors of the Península Valdés tidal front (42°–45°S; SW Atlantic Ocean), focusing on possible causes such as oceanographic conditions (well-mixed, frontal and stratified), feeding activities, reproductive behaviour and predation risks. Day and night samples were collected with a MultiNet of 67 µm and 300 µm mesh size, from two depth layers. Conductivity-temperature-depth (CTD) profiles were also recorded. In the well-mixed waters, the size structure of O. dioica was similar in the upper and lower layers both in the day and night samples, probably due to the continuous vertical movement caused by the turbulent mixing of waters. In the frontal and stratified areas, mature animals were found in the upper layers during the night, possibly due to their aggregation in surface waters for synchronized spawning. In these areas, a high percentage of well-fed larvaceans was also found. Principal component analysis showed that, at night, the abundance of potential predators such as chaetognaths, ctenophores and anchovy larvae was correlated with the parameter of stability of the water column (Simpson parameter), and that these were more abundant in the upper layers of the stratified area containing larvaceans. Our results suggest that the degree of stratification of the water column was the main factor affecting the vertical distribution of O. dioica. © 2015, Taylor & Francis. |
| title |
Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean |
| title_short |
Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean |
| title_full |
Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean |
| title_fullStr |
Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean |
| title_full_unstemmed |
Diel vertical distribution of the larvacean Oikopleura dioica in a North Patagonian tidal frontal system (42°–45°S) of the SW Atlantic Ocean |
| title_sort |
diel vertical distribution of the larvacean oikopleura dioica in a north patagonian tidal frontal system (42°–45°s) of the sw atlantic ocean |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17451000_v11_n6_p633_Spinelli http://hdl.handle.net/20.500.12110/paper_17451000_v11_n6_p633_Spinelli |
| _version_ |
1768542006241394688 |