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  • INST MALACOL  (1)
  • INST PATAGONIA  (1)
  • SPRINGER  (1)
  • 2020-2023
  • 2010-2014  (3)
  • 1
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    Age and Growth of Olivancillaria deshayesiana (Gastropoda: Olividae) in the Southwestern Atlantic Ocean (2012)
    INST MALACOL
    In:  EPIC3Malacologia, INST MALACOL, 55, pp. 163-170, ISSN: 0076-2997
    Details
    Publication Date: 2019-07-16
    Description: The population structure, particularly growth, age, mortality and somatic production of the olivid snail Olivancillaria deshayesiana were investigated. Annual formation of internal shell growth marks was confirmed by the record of stable oxygen isotopes in the shell, which reflects seasonal patterns of water temperature. A von Bertalanffy growth model fitted to 81 size-at- age data pairs, indicating that O. deshayesiana may attain 31 mm SL in about 10 years. The estimated total mortality Z and natural mortality M were 0.651 y-1 and 0.361 y-1, respectively. Fishing mortality F was 0.290 y-1, and the exploitation rate E was 0.445, indicating that this population was not overexploited at the time of the study. However, this situation may well change in the future, since the important prawn and shrimp fisheries (in intensity and scale) in the Mar del Plata area (38°20’S, 57°37’W) may indirectly affect the exploitation status of the studied population
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 2
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    Impact of ocean acidification on escape performance of the king scallop, Pecten maximus, from Norway (2013)
    SPRINGER
    In:  EPIC3Marine Biology, SPRINGER, 160(8), pp. 1995-2006, ISSN: 0025-3162
    Details
    Publication Date: 2017-01-16
    Description: The ongoing process of ocean acidification already affects marine life, and according to the concept of oxygen and capacity limitation of thermal tolerance, these effects may be intensified at the borders of the thermal tolerance window. We studied the effects of elevated CO2 concentrations on clapping performance and energy metabolism of the commercially important scallop Pecten maximus. Individuals were exposed for at least 30 days to 4 °C (winter) or to 10 °C (spring/summer) at either ambient (0.04 kPa, normocapnia) or predicted future PCO2 levels (0.11 kPa, hypercapnia). Cold-exposed (4 °C) groups revealed thermal stress exacerbated by PCO2 indicated by a high mortality overall and its increase from 55 % under normocapnia to 90 % under hypercapnia. We therefore excluded the 4 °C groups from further experimentation. Scallops at 10 °C showed impaired clapping performance following hypercapnic exposure. Force production was significantly reduced although the number of claps was unchanged between normocapnia- and hypercapnia-exposed scallops. The difference between maximal and resting metabolic rate (aerobic scope) of the hypercapnic scallops was significantly reduced compared with normocapnic animals, indicating a reduction in net aerobic scope. Our data confirm that ocean acidification narrows the thermal tolerance range of scallops resulting in elevated vulnerability to temperature extremes and impairs the animal’s performance capacity with potentially detrimental consequences for its fitness and survival in the ocean of tomorrow.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 3
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    Trophic ecology of limpets among rocky intertidal in Bahía Laredo, Strait of Magellan (Chile) (2014)
    INST PATAGONIA
    In:  EPIC3Anales del Instituto de la Patagonia, INST PATAGONIA, 42(2), pp. 65-70, ISSN: 0718-6932
    Details
    Publication Date: 2014-12-16
    Description: Diet composition and food sources of the limpets Nacella deaurata and Nacella magellanica were studied in a subantarctic rocky-boulder intertidal system in the Magellan Strait, on the basis of gut contents and stable isotope analyses. Green microalgae (32.5 %), brown algae (22.2 %) and red algae (21.3 %) constituted the main food items in N. deaurata while green microalgae (28.3 %), micro-bivalves (27.4 %) and foraminiferans (20.9 %) were dominant food components in N. magellanica. Relative food items contribution indicated a generalist-type trophic strategy in both species, albeit N. deaurata exhibited a more pronounced herbivory. Stable isotope ratios confirmed this omnivorous / grazer lifestyle. Our results coincide with other studies that report green microalgae to be the major food item for other Nacella species but they also contradict the common view that these limpets are herbivorous animals.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
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