Demersal and pelagic species of fish and squid from the Patagonian shelf
Dataset containing 2007 records of occurrence of 39 species of fish and 2 species of squid distributed on the Patagonian continental shelf and slope. This dataset describes a new and revised version of the original data published through OBIS and contains individual morphometrics. Specimens are representative of pelagic, demersal, demersal-pelagic, demersal-benthic and benthic habits and they were collected by commercial fishing vessels in autumn (May-June, 2001, 51 catches), winter (July-August, 2001, 38 catches) and summer (January-February, 2002, 112 catches). The sampling was carried out with bottom trawls at a depth range of 73-370 m. The survey was located between 39° - 52° S and 55° - 65° W. / Conjunto de datos con 2007 registros morfometricos de 39 especies de peces y 2 especies de calamares de la plataforma y talud continental patagónicos. Este conjunto de datos describe una nueva versión de los datos originales publicados a través de OBIS y contiene datos de morfometría individual.Los especimenes representan organismos de hábitos pelágico, demersal, demersal-pelágico, demersal-bentónico y bentónico y fueron recolectados por barcos comerciales en otoño (Mayo-Junio 2001, 51 lances de captura), invierno (Julio-Agosto 2001, 38 lances de captura) y en verano (enero-febrero 2002, 112 lances de captura). El muestreo fue llevado a cabo con redes de arrastre a un rango de profundidad de 73-370 m. El área relevada se localizó entre 39° - 52° S y los 55° - 65° O.
The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 241 records.
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Researchers should cite this work as follows:
Eder E B, Marin M R, Lewis M N (2015): Demersal and pelagic species of fish and squid from the Patagonian shelf. v1.7. ArOBIS Centro Nacional Patagónico. Dataset/Samplingevent. http://arobis.cenpat-conicet.gob.ar:8081/resource?r=argentina-fishes&v=1.7
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The publisher and rights holder of this work is ArOBIS Centro Nacional Patagónico. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License.
Occurrence; Patagonia; teleosts; elasmobranches; cephalopods; Southwestern Atlantic Ocean; demersal habitat; pelagic habitat.
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The argentine continental shelf, in the Atlantic margin of South America, is bounded by the line of the coast and the continental slope and is the most extensive submerged plain in the world, with an area of 930.000 km2 (Cousseau and Perrotta, 2013). It is characterized by gentle slopes and low-relief. The shelf waters are of sub-Antarctic origin diluted by continental flows and modified by exchanges of mass and heat with the atmosphere. The main distribution of the species of this dataset is: • The internal and external sectors of the shelf off the Province of Buenos Aires (35° S) to Patagonia (48° S). • The southern part of the Patagonian-Fuegian shelf and Malvinas/Falkland Islands, along the outer shelf to the North, up to approximately 42° S. • Deeper waters near the continental slope.
|Bounding Coordinates||South West [-52, -65], North East [-39, -55]|
All specimens were identified to species level. The dataset included 39 marine species of fish, representative of half the best known fish species from the Argentine continental shelf (55.7 %, Cosseau and Perrota 2013), and 2 species of squid, that were captured during three seasons, autumn (May-June, 2001), winter (July-August, 2001) and summer (January-February, 2002). Autumn and summer records presented a high diversity of species (80.5 and 78 %, respectively), while only 46% of the species were present in winter
|Start Date / End Date||2001-05-11 / 2001-06-26|
|Start Date / End Date||2002-01-11 / 2002-02-27|
|Start Date / End Date||2001-07-21 / 2001-08-31|
The dataset was obtained to contribute to the understanding of the biochemical composition and energetic value of fish and squid species as potential prey for top predators of the Patagonian continental shelf (E. Eder, 2003; Eder and Lewis, 2005). The Patagonian shelf supports a diverse community of top predators (residents and seasonal migrants that travel to tropical or Northern Hemisphere wintering grounds; Croxall and Wood 2002, Bastida and Rodríguez, 2005). The shelf system is characterized by its high productivity but the knowledge of energy content of potential preys is scarce. This study estimated the nutritional and energetic values of the complete specimen of commercial and non-commercial fish and squid species in Patagonia as relevant data to develop models of energy transfer between trophic levels. The samples of this study were also used to determine stable C and N ratios and assess foraging strategies and resource partitioning in marine top predators from Patagonia (Lewis et al., 2006).
|Title||Nutritional quality of the diet of the southern elephant seal, Mirounga leonina, in Patagonia|
|Funding||This work was conducted by PEI Nº 6187/03 National Research Council of Argentina (CONICET) grant.|
|Study Area Description||The Patagonian continental shelf, in the Atlantic margin of South America, is the largest submerged plain in the Southern Hemisphere (930.000 km2), characterized by relatively shallow depth (mostly 150 m deep).Productive zones are associated with major water mass transitions, currents, nutrient flow connected to upwelling and bathymetric features (Cosseau and Perrota, 2013). The different water masses promote the recycling of nutrients accounting for its high productivity (Podesta et al. 1991, Carreto et al. 1995). The productivity of this area generates ‘hotspots’ of biodiversity and foraging of marine top predators is regularly observed (Croxall and Wood 2002, Campagna and Croxall 2003, Bastida and Rodríguez, 2005). The sampling survey was located between 39° - 52° S and 55° - 65° W. The specimens of this work were obtained through autumn (May-June, 2001), winter (July-August, 2001) and summer (January-February) and are representative of half the best known fish species from the Argentine continental shelf (55.7 %, Cosseau and Perrota, 2013).|
|Design Description||The aim of this project was to obtain the biochemical composition and energetic value of whole specimens of potential prey species (fish and squid) for top predators of the Patagonian continental shelf (E. Eder, 2003; Eder and Lewis, 2005). The samples of this study were also used to determine stable C and N ratios and assess foraging strategies and resource partitioning in marine top predators from Patagonia (Lewis et al., 2006). The sampling was carried out between 39° - 52° S and 55° - 65° W at a depth range of 73-370 m. Fish and squid specimens (commercial target and by-catch) were collected by vessels of the company Harengus, operating with bottom trawlers during approximately two months on high sea waters during three seasons (Autumn and Winter 2001 and Summer 2002). The associated data of each fishing haul were: date, hour,location (decimal Latitude and Longitude of the position while pulling the net) and depth of the catch (the maximum depth reached by the net). Specimens were frozen on board, and identified at species level at the Ichthyology laboratory of the Centro Nacional Patagonico,Puerto Madryn, Argentina. Once identified, specimens were selected by location and depth, as representative of potential preys of top predators of the Patagonian Shelf, for morphometric measurements and processing for biochemical composition. Samples were dried at 100 °C (until constant weight). Stable isotope analysis was determined in muscle samples, in the Research Laboratory for Archaeology and the History of Art at the University of Oxford, UK (Lewis et al. 2006). Isotopic analyses were performed using an automated carbon and nitrogen analyzer (Carlo Erba, Turin, Italy) coupled in continuous-flow mode to a Geo 20/20 isotope-ratio-monitoring mass-spectrometer (PDZEuropa, Crewe, UK). Moisture content was obtained by difference between wet and dry mass (expressed as a percentage of the original wet mass). Lipids were extracted with a Soxhlet equipment, using an ether–ethylic solvent. Protein content was determined by the Lowry method. Ash content was measured using a muffle furnace at 550°C (AKE 1337 1100 °C). The energetic value was determined indirectly, using Rubner’s coefficients for aquatic organisms: 9.5 kcal g–1 for lipids, 5.65 kcal g–1 for proteins (Winberg, 1971). Results are means of triplicate determinations (average standard deviation was less than 3%).|
The personnel involved in the project:
Specimens of fish and squid (commercial target and by catch) were taken daily by commercial fishing vessels operating with bottom trawls during autumn (May-June, 2001, 51 catches), winter (July-August, 2001, 38 catches) and summer (January-February, 2002, 112 catches). The fishing company provided the associated data of each fishing haul: date, hour and location decimal Latitude and Longitude of the position while pulling the net) and depth of the catch (the maximum depth reached by the net). Specimens were frozen on board,and identified at species level at the Ichthyology laboratory of Centro Nacional Patagonico, Puerto Madryn, Argentina. The taxonomical identification of species was made by the specialists Dr. A. Gosztonyi and Dr. M. Re and the scientific names and their current accurate spelling were also reviewed using suitable literature (Brunetti et al., 1998; Cousseau and Perrotta, 2013) and the WoRMS web site(http://www.marinespecies.org/). Sex (when possible) and morphometric measures were taken for each specimen: wet mass (g) and wet mass of viscera (g, empty stomach); total and standard length (cm) for fish; mantle, head and fin length and width (cm) for squid; left and right fin length (cm) and maximum fin width (cm) for skates.
|Study Extent||The sampling area was located on the Patagonian Continental Shelf, in the Atlantic margin of South America, within -52 to -39 ºS and -65 to -55 ºW. The depth range of the sampling was 73-370 m.|
Method step description:
- Step1: Sampling locality and depth were recorded in each season. Step2: Specimens were sent to the lab for species and sex identification and morphometric measurements.
- Bastida R., Rodriguez D. (2005) Marine Mammals of Patagonia and Antarctica. Vazquez Mazzini, Buenos Aires.
- Brunetti N.E., Ivanovic M.L., Beatriz E.(1998) Calamares Omastréfidos (Cephalopoda, Omastrephidae). In: Boschi EE (ed) El Mar Argentino y sus recursos pesqueros, Tomo 2. Los moluscos de interés pesquero: cultivos y estrategias reproductivas de bivalvos y equinoideos. Contribución Instituto Nacional de Investigación y Desarrollo Pesquero No. 1044, Mar del Plata, Argentina.
- Campagna C., Croxall J. (2003) Application of the landscape species approach to the Patagonian Large Marine Ecosystem (The Sea and Sky Project). UICN-WPC, Durban
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- Eder E., Lewis M. (2005). Proximate composition and energy value of demersal and pelagic prey species from Southwest Atlantic. Marine Ecology Progress Series (MEPS) 291:43-52 doi:10.3354/meps291043
- Lewis R., O’Connell T.C., Lewis M., Campagna C., Hoelzel R. (2006) Sex-specific foraging strategies and resource partitioning in the southern elephant seal (Mirounga leonina). Proceedings of the Royal Society: Biological Series B 273 (1603), 2901–2907. doi: 10.1098/rspb.2006.3642
- Winberg G.C. (1971) Methods for estimation of production of aquatic animals. Academic Press, New York
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marine, harvested by iOBIS