Exploring nursery sites for oviparous chondrichthyans in the Southwest Atlantic (36°S–41°S)
The aim of this paper was to explore egg-laying areas of oviparous chondrichthyans occurring in the northern part of the Southwest Atlantic Ocean (36°S–41°S) at between 50 and 200 metres depth and the Mar del Plata Canyon (from 200 to 3447 m). A total of 515 capsules were collected corresponding to...
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todo:paper_17451000_v12_n7_p715_Vazquez2023-10-03T16:31:53Z Exploring nursery sites for oviparous chondrichthyans in the Southwest Atlantic (36°S–41°S) Vazquez, D.M. Mabragaña, E. Gabbanelli, V. Díaz de Astarloa, J.M. Argentine shelf-break front egg cases nursery sites oviparous chondrichthyans Southwest Atlantic abundance conservation planning egg production habitat management nursery ground oviparity population density protected area shelf break front species conservation Argentina Argentine Shelf Atlantic Ocean Atlantic Ocean (Southwest) Buenos Aires [Argentina] Mar del Plata Amblyraja doellojuradoi Bathyraja Bathyraja albomaculata Bathyraja brachyurops Bathyraja macloviana Psammobatis lentiginosa Psammobatis normani Psammobatis rudis Schroederichthys bivius The aim of this paper was to explore egg-laying areas of oviparous chondrichthyans occurring in the northern part of the Southwest Atlantic Ocean (36°S–41°S) at between 50 and 200 metres depth and the Mar del Plata Canyon (from 200 to 3447 m). A total of 515 capsules were collected corresponding to 10 species. Four species accounted for 87.6% of the total catch: Psammobatis normani, Bathyraja macloviana, Amblyraja doellojuradoi and Bathyraja brachyurops. The remaining corresponded to Schroederichthys bivius, Psammobatis rudis, Zearaja chilensis, Bathyraja albomaculata, Psammobatis lentiginosa and Bathyraja sp. Most hauls were monospecific and relatively few hauls contained four or five species (southern part of the area, in sites located at 75 and 94–105 m depth). No egg capsules were recorded between 1712 m and 3447 m. Highest densities (>3000 capsules/km2) were mainly found between 39°46.2′ and 40°29.9′S from 85 to 105 m and they were also recorded near the Mar del Plata Canyon at 37°59.7′S and at 852 m. The highest value recorded was 12,326 capsules/km2 (located at 40°18.9′S and 85.4 m). The highest densities for each of the most abundant species are discussed. The finding of high densities of egg cases near the Argentine shelf-break front indicates that many skate species use this area as a nursery site. The egg-laying areas explored here are the first reported sites of this kind in the Southwest Atlantic Ocean. Recognizing and protecting egg-laying habitats may be important steps to a long-term conservation of oviparous chondrichthyan populations. © 2016 Informa UK Limited, trading as Taylor & Francis Group. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_17451000_v12_n7_p715_Vazquez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentine shelf-break front egg cases nursery sites oviparous chondrichthyans Southwest Atlantic abundance conservation planning egg production habitat management nursery ground oviparity population density protected area shelf break front species conservation Argentina Argentine Shelf Atlantic Ocean Atlantic Ocean (Southwest) Buenos Aires [Argentina] Mar del Plata Amblyraja doellojuradoi Bathyraja Bathyraja albomaculata Bathyraja brachyurops Bathyraja macloviana Psammobatis lentiginosa Psammobatis normani Psammobatis rudis Schroederichthys bivius |
| spellingShingle |
Argentine shelf-break front egg cases nursery sites oviparous chondrichthyans Southwest Atlantic abundance conservation planning egg production habitat management nursery ground oviparity population density protected area shelf break front species conservation Argentina Argentine Shelf Atlantic Ocean Atlantic Ocean (Southwest) Buenos Aires [Argentina] Mar del Plata Amblyraja doellojuradoi Bathyraja Bathyraja albomaculata Bathyraja brachyurops Bathyraja macloviana Psammobatis lentiginosa Psammobatis normani Psammobatis rudis Schroederichthys bivius Vazquez, D.M. Mabragaña, E. Gabbanelli, V. Díaz de Astarloa, J.M. Exploring nursery sites for oviparous chondrichthyans in the Southwest Atlantic (36°S–41°S) |
| topic_facet |
Argentine shelf-break front egg cases nursery sites oviparous chondrichthyans Southwest Atlantic abundance conservation planning egg production habitat management nursery ground oviparity population density protected area shelf break front species conservation Argentina Argentine Shelf Atlantic Ocean Atlantic Ocean (Southwest) Buenos Aires [Argentina] Mar del Plata Amblyraja doellojuradoi Bathyraja Bathyraja albomaculata Bathyraja brachyurops Bathyraja macloviana Psammobatis lentiginosa Psammobatis normani Psammobatis rudis Schroederichthys bivius |
| description |
The aim of this paper was to explore egg-laying areas of oviparous chondrichthyans occurring in the northern part of the Southwest Atlantic Ocean (36°S–41°S) at between 50 and 200 metres depth and the Mar del Plata Canyon (from 200 to 3447 m). A total of 515 capsules were collected corresponding to 10 species. Four species accounted for 87.6% of the total catch: Psammobatis normani, Bathyraja macloviana, Amblyraja doellojuradoi and Bathyraja brachyurops. The remaining corresponded to Schroederichthys bivius, Psammobatis rudis, Zearaja chilensis, Bathyraja albomaculata, Psammobatis lentiginosa and Bathyraja sp. Most hauls were monospecific and relatively few hauls contained four or five species (southern part of the area, in sites located at 75 and 94–105 m depth). No egg capsules were recorded between 1712 m and 3447 m. Highest densities (>3000 capsules/km2) were mainly found between 39°46.2′ and 40°29.9′S from 85 to 105 m and they were also recorded near the Mar del Plata Canyon at 37°59.7′S and at 852 m. The highest value recorded was 12,326 capsules/km2 (located at 40°18.9′S and 85.4 m). The highest densities for each of the most abundant species are discussed. The finding of high densities of egg cases near the Argentine shelf-break front indicates that many skate species use this area as a nursery site. The egg-laying areas explored here are the first reported sites of this kind in the Southwest Atlantic Ocean. Recognizing and protecting egg-laying habitats may be important steps to a long-term conservation of oviparous chondrichthyan populations. © 2016 Informa UK Limited, trading as Taylor & Francis Group. |
| format |
JOUR |
| author |
Vazquez, D.M. Mabragaña, E. Gabbanelli, V. Díaz de Astarloa, J.M. |
| author_facet |
Vazquez, D.M. Mabragaña, E. Gabbanelli, V. Díaz de Astarloa, J.M. |
| author_sort |
Vazquez, D.M. |
| title |
Exploring nursery sites for oviparous chondrichthyans in the Southwest Atlantic (36°S–41°S) |
| title_short |
Exploring nursery sites for oviparous chondrichthyans in the Southwest Atlantic (36°S–41°S) |
| title_full |
Exploring nursery sites for oviparous chondrichthyans in the Southwest Atlantic (36°S–41°S) |
| title_fullStr |
Exploring nursery sites for oviparous chondrichthyans in the Southwest Atlantic (36°S–41°S) |
| title_full_unstemmed |
Exploring nursery sites for oviparous chondrichthyans in the Southwest Atlantic (36°S–41°S) |
| title_sort |
exploring nursery sites for oviparous chondrichthyans in the southwest atlantic (36°s–41°s) |
| url |
http://hdl.handle.net/20.500.12110/paper_17451000_v12_n7_p715_Vazquez |
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AT vazquezdm exploringnurserysitesforoviparouschondrichthyansinthesouthwestatlantic36s41s AT mabraganae exploringnurserysitesforoviparouschondrichthyansinthesouthwestatlantic36s41s AT gabbanelliv exploringnurserysitesforoviparouschondrichthyansinthesouthwestatlantic36s41s AT diazdeastarloajm exploringnurserysitesforoviparouschondrichthyansinthesouthwestatlantic36s41s |
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