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  • 2010-2014  (5)
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  • 1
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    Unknown
    Effects of water temperature and diet on the element composition of European eel (Anguilla anguilla) otoliths (2010)
    In:  [Talk] In: 10. European Workshop on Laser Ablation, 29.06.-01.07.2010, Kiel, Germany .
    Details
    Publication Date: 2012-07-06
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 2
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    Newcomers in the Baltic Sea: an attempt to trace the origins and whereabouts of thicklip grey mullet Chelon labrosus (2011)
    Springer
    In:  Fisheries Science, 77 . pp. 757-764.
    Details
    Publication Date: 2019-09-24
    Description: In recent years, thicklip grey mullet Chelon labrosus has shown increasing expansion of its native habitats in the north-eastern Atlantic into northerly adjacent areas including the North Sea and the brackish Baltic Sea. Despite the regular annual and seasonal occurrence of C. labrosus in the western Baltic during the warm months, nothing is known of the origin or whereabouts of the mullet during the cold season. As different possible migration scenarios can be considered, we performed otolith microchemistry analyses on specimens from the western Baltic Sea to identify the origin of this nonindigenous species. Comparison with North Sea samples revealed common habitat preferences and underlined the highly euryhaline nature of C. labrosus in different recently occupied habitats. Occasional fluctuations of Sr/Ca ratio along the growth axis suggest periodical migration between waters of different salinities but did not reveal distinct migration pathways.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s12562-011-0384-1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Dietary effects on fatty acid composition in muscle tissue of juvenile European eel, Anguilla anguilla (L.) (2012)
    Springer
    In:  Helgoland Marine Research, 66 (1). pp. 51-61.
    Details
    Publication Date: 2019-07-09
    Description: The role of intracontinental migration patterns of European eel (Anguilla anguilla) receives more and more recognition in both ecological studies of the European eel and possible management measures, but small-scale patterns proved to be challenging to study. We experimentally investigated the suitability of fatty acid trophic markers to elucidate the utilization of feeding habitats. Eight groups of juvenile European eels were fed on eight different diets in a freshwater recirculation system at 20°C for 56 days. Three groups were fed on freshwater diets (Rutilus rutilus, Chironomidae larvae, and Gammarus pulex) and four groups were reared on diets of a marine origin (Clupea harengus, Crangon crangon, Mysis spec., and Euphausia superba) and one on commercial pellets used in eel aquaculture. Fatty acid composition (FAC) of diets differed significantly with habitat. FAC of eel muscle tissue seemed to be rather insensitive to fatty acids supplied with diet, but the general pattern of lower n3:n6 and EPA:ARA ratios in freshwater prey organisms could be traced in the respective eels. Multivariate statistics of the fatty acid composition of the eels resulted in two distinct groups representing freshwater and marine treatments. Results further indicate the capability of selectively restraining certain fatty acids in eel, as e.g. the n3:n6 ratio in all treatments was 〈4, regardless of dietary n3:n6. In future studies on wild eel, these measures can be used to elucidate the utilization of feeding habitats of individual European eel.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s10152-011-0246-3
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Temperature dependency of element incorporation into European eel (Anguilla anguilla) otoliths (2011)
    Springer
    In:  Analytical and Bioanalytical Chemistry, 399 (6). pp. 2175-2184.
    Details
    Publication Date: 2019-01-21
    Description: The present study experimentally tested the influence of water temperature on the inclusion of 15 elements into juvenile European eel (Anguilla anguilla) otoliths in freshwater. It should be investigated (1) if temperature effects on otolith Sr/Ca might impair the interpretation of migration studies and (2) if the elemental composition of otoliths can be used to reconstruct experienced temperature histories of eels. Therefore, eels were kept under full experimental conditions at three different water temperatures (14 °C, 19 °C and 24 °C) for 105 days. Thereafter, laser ablation inductively coupled mass spectrometry (LA-ICPMS) was conducted on the outer edge of their otoliths. Our analyses revealed significant temperature effects on otolith Na/Ca, Sr/Ca, Mg/Ca, Mn/Ca, Ba/Ca, Zr/Ca and Y/Ca ratios. Variations of Sr/Ca caused by temperature were far below those used to detect eel movements between waters of different salinities and will therefore not affect the interpretation of migration studies. Elemental fingerprints of Sr/Ca, Mg/Ca, Mn/Ca and Ba/Ca ratios resulted in clearly separated groups according to temperature treatments, indicating that changes in water temperature might lead to characteristic changes in otolith element composition. However, the successful application of elemental fingerprints to reconstruct moderate changes of water temperature seems doubtful because the influence of somatic growth on otolith microchemistry still remains unclear, and temperature-induced variations could be overlaid by changes of water element concentrations during growth periods. Nevertheless, our results contribute to the completion of knowledge about factors influencing element incorporation and help to explain variations in element composition of fish otoliths.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00216-010-4412-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Unknown
    The future of cephalopod populations, fisheries, culture, and research in Europe (2010)
    ICES
    In:  In: Cephalopod biology and fisheries in Europe. , ed. by Pierce, G. J., Allcock, L., Bruno, I., Bustamante, P., Gonzalez, A., Guerra, A., Jereb, P., Lefkaditou, E., Malham, S., Moreno, a., Pereira, J., Piatkowski, U., Rasero, M., Sanchez, P., Santos, M. B., Santurtun, M., Seixas, S., Sobrino, I. and Villanueva, R. ICES Cooperative Research Report, 303 . ICES, Copenhagen, Denmark, pp. 86-118. ISBN 978‐87‐7482‐078‐9
    Details
    Publication Date: 2019-06-25
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
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