Distribution and behavior of Argentine hake larvae: Evidence of a biophysical mechanism for self-recruitment in northern Patagonian shelf waters
It has been proposed that vertical movements of planktonic organisms coupled to a horizontally or vertically stratified circulation pattern could describe a retention mechanism, with ecological advantages such as favoring recruitment success. The Patagonian stock of the Argentine hake Merluccius hu...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universidad Autónoma de Baja California
2011-06-01
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| Series: | Ciencias Marinas |
| Online Access: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1777 |
| _version_ | 1797279495311327232 |
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| author | G Álvarez-Colombo C Dato G Macchi E Palma L Machinandiarena HE Christiansen P Betti C Derisio P Martos F Castro-Machado D Brown M Ehrlich H Mianzan EM Acha |
| author_facet | G Álvarez-Colombo C Dato G Macchi E Palma L Machinandiarena HE Christiansen P Betti C Derisio P Martos F Castro-Machado D Brown M Ehrlich H Mianzan EM Acha |
| author_sort | G Álvarez-Colombo |
| collection | DOAJ |
| description |
It has been proposed that vertical movements of planktonic organisms coupled to a horizontally or vertically stratified circulation pattern could describe a retention mechanism, with ecological advantages such as favoring recruitment success. The Patagonian stock of the Argentine hake Merluccius hubbsi spawns mainly from January to February in relation to a highly productive tidal frontal system. Although retention of fish eggs and larvae has been previously hypothesized for this system, it has not been fully proven and its mechanisms have not yet been proposed for hake early stages. To better understand the physical and biological processes involved in the survival and distribution of hake larvae, we focused on transport features and associated larval behavior governing the retention of larvae in the spawning area and their subsequent distribution to settlement and nursery grounds. To test this hypothesis at appropriate spatial and temporal scales, we analyzed acoustic records to describe vertical and horizontal distribution patterns of hake larvae, discrete plankton samples to confirm the identity of acoustic targets, and outputs from a numerical circulation model to estimate current patterns in the region during the hake spawning months. Coinciding with the development of a functional swimbladder, hake larvae of 4 mm and larger showed a strong vertical distribution pattern associated with a sound scattering layer migrating from the thermocline during the night to near-bottom depths during the day. This diel vertical migration pattern was associated with the circulation structure, equivalent to a two-layer flow, indicating a recirculation pattern in the vertical plane. The retention of early larval stages in the spawning area was evident from the acoustic data, indicating a persistent location for the bulk of hake larvae at the main spawning ground during summer months. The distribution extends to the rest of the nursery grounds as the breeding season advances in agreement with the general pattern of middle shelf bottom circulation vectors produced by the numerical model. The results are discussed within the framework of Bakun’s fundamental triad, identifying its elements. In addition, a conceptual model for the main biophysical coupling processes during the early life history of M. hubbsi is proposed in order to gain insight about the recruitment mechanism of this species.
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| first_indexed | 2024-03-07T16:27:06Z |
| format | Article |
| id | doaj.art-ebd3d1e566aa4cc1b294032bbcc84ce7 |
| institution | Directory Open Access Journal |
| issn | 0185-3880 2395-9053 |
| language | English |
| last_indexed | 2024-03-07T16:27:06Z |
| publishDate | 2011-06-01 |
| publisher | Universidad Autónoma de Baja California |
| record_format | Article |
| series | Ciencias Marinas |
| spelling | doaj.art-ebd3d1e566aa4cc1b294032bbcc84ce72024-03-03T17:57:08ZengUniversidad Autónoma de Baja CaliforniaCiencias Marinas0185-38802395-90532011-06-01374B10.7773/cm.v37i4B.1777Distribution and behavior of Argentine hake larvae: Evidence of a biophysical mechanism for self-recruitment in northern Patagonian shelf watersG Álvarez-Colombo0C Dato1G Macchi2E Palma3L Machinandiarena4HE Christiansen5P Betti6C Derisio7P Martos8F Castro-Machado9D Brown10M Ehrlich11H Mianzan12EM Acha13Instituto Nacional de Investigación y Desarrollo PesqueroInstituto Nacional de Investigación y Desarrollo PesqueroInstituto Nacional de Investigación y Desarrollo Pesquero - Consejo Nacional de Investigaciones Científicas y TécnicasUniversidad Nacional del SurInstituto Nacional de Investigación y Desarrollo PesqueroInstituto Nacional de Investigación y Desarrollo PesqueroInstituto Nacional de Investigación y Desarrollo Pesquero - Consejo Nacional de Investigaciones Científicas y TécnicasInstituto Nacional de Investigación y Desarrollo Pesquero - Consejo Nacional de Investigaciones Científicas y TécnicasUniversidad Nacional de Mar del PlataInstituto Nacional de Investigación y Desarrollo PesqueroInstituto Nacional de Investigación y Desarrollo PesqueroInstituto Nacional de Investigación y Desarrollo PesqueroConsejo Nacional de Investigaciones Científicas y TécnicasInstituto Nacional de Investigación y Desarrollo Pesquero - Consejo Nacional de Investigaciones Científicas y Técnicas It has been proposed that vertical movements of planktonic organisms coupled to a horizontally or vertically stratified circulation pattern could describe a retention mechanism, with ecological advantages such as favoring recruitment success. The Patagonian stock of the Argentine hake Merluccius hubbsi spawns mainly from January to February in relation to a highly productive tidal frontal system. Although retention of fish eggs and larvae has been previously hypothesized for this system, it has not been fully proven and its mechanisms have not yet been proposed for hake early stages. To better understand the physical and biological processes involved in the survival and distribution of hake larvae, we focused on transport features and associated larval behavior governing the retention of larvae in the spawning area and their subsequent distribution to settlement and nursery grounds. To test this hypothesis at appropriate spatial and temporal scales, we analyzed acoustic records to describe vertical and horizontal distribution patterns of hake larvae, discrete plankton samples to confirm the identity of acoustic targets, and outputs from a numerical circulation model to estimate current patterns in the region during the hake spawning months. Coinciding with the development of a functional swimbladder, hake larvae of 4 mm and larger showed a strong vertical distribution pattern associated with a sound scattering layer migrating from the thermocline during the night to near-bottom depths during the day. This diel vertical migration pattern was associated with the circulation structure, equivalent to a two-layer flow, indicating a recirculation pattern in the vertical plane. The retention of early larval stages in the spawning area was evident from the acoustic data, indicating a persistent location for the bulk of hake larvae at the main spawning ground during summer months. The distribution extends to the rest of the nursery grounds as the breeding season advances in agreement with the general pattern of middle shelf bottom circulation vectors produced by the numerical model. The results are discussed within the framework of Bakun’s fundamental triad, identifying its elements. In addition, a conceptual model for the main biophysical coupling processes during the early life history of M. hubbsi is proposed in order to gain insight about the recruitment mechanism of this species. https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1777 |
| spellingShingle | G Álvarez-Colombo C Dato G Macchi E Palma L Machinandiarena HE Christiansen P Betti C Derisio P Martos F Castro-Machado D Brown M Ehrlich H Mianzan EM Acha Distribution and behavior of Argentine hake larvae: Evidence of a biophysical mechanism for self-recruitment in northern Patagonian shelf waters Ciencias Marinas |
| title | Distribution and behavior of Argentine hake larvae: Evidence of a biophysical mechanism for self-recruitment in northern Patagonian shelf waters |
| title_full | Distribution and behavior of Argentine hake larvae: Evidence of a biophysical mechanism for self-recruitment in northern Patagonian shelf waters |
| title_fullStr | Distribution and behavior of Argentine hake larvae: Evidence of a biophysical mechanism for self-recruitment in northern Patagonian shelf waters |
| title_full_unstemmed | Distribution and behavior of Argentine hake larvae: Evidence of a biophysical mechanism for self-recruitment in northern Patagonian shelf waters |
| title_short | Distribution and behavior of Argentine hake larvae: Evidence of a biophysical mechanism for self-recruitment in northern Patagonian shelf waters |
| title_sort | distribution and behavior of argentine hake larvae evidence of a biophysical mechanism for self recruitment in northern patagonian shelf waters |
| url | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1777 |
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