Bode, Antonio; Alvarez-Ossorio, María Teresa; Cunha, M Emilia; Garrido, Susana; Peleteiro, J Benito; Porteiro, Carmela; Valdés, Luis; Varela, Manuel (2013): Stable nitrogen and carbon isotopes of plankton samples and selected copoepods around the Iberan Peninsula 2001-2004 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.815448, Supplement to: Bode, A et al. (2007): Stable nitrogen isotope studies of the pelagic food web on the Atlantic shelf of the Iberian Peninsula. Progress in Oceanography, 74(2-3), 115-131, https://doi.org/10.1016/j.pocean.2007.04.005
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Abstract:
The structure and variability of pelagic food webs along the north and northwestern shelf of the Iberian Peninsula were analysed using natural abundance of nitrogen stable isotopes of plankton and pelagic consumers. Plankton composition was mainly studied in size-fractionated samples, but also the isotopic signatures of three copepod species, as representative of primary consumers, were considered. Several fish species were included as planktivorous consumers, with special attention to sardine (Sardina pilchardus). Finally, top pelagic consumers were represented by the common dolphin (Delphinus delphis). The relationship between trophic position and body size implies large variability in the ratio of predator to prey sizes, likely because widespread omnivory and plankton consumption by relatively large predators. Planktivorous species share a common trophic position, suggesting potential competition for food, and low nitrogen isotope enrichment between prey and consumers suggest nutrient limitation and recycling at the base of the food web. Both experimental and field evidences indicate that the muscle of sardine integrates fish diet over seasonal periods and reflects the composition of plankton from large shelf areas. The low mobility of sardines during periods of low population size is consistent with differential isotopic signatures found in shelf zones characterised by upwelling nutrient inputs.
Coverage:
Median Latitude: 42.898579 * Median Longitude: -5.632672 * South-bound Latitude: 36.833333 * West-bound Longitude: -9.696500 * North-bound Latitude: 44.450850 * East-bound Longitude: -1.421767
Date/Time Start: 1999-03-14T00:00:00 * Date/Time End: 2004-06-19T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Bode, A; Alvarez-Ossorio, MT; Cunha, ME et al. (2013): Stable isotopes and C/N ratios of three copepod taxa collected at a shelf station in the south of Bay of Biscay. https://doi.org/10.1594/PANGAEA.815447
- Bode, A; Alvarez-Ossorio, MT; Cunha, ME et al. (2013): Stable isotope ratios of plankton samples from the Iberian Peninsula. https://doi.org/10.1594/PANGAEA.815357