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  • 11
    Book
    Book
    Wale, Robben und Eisbären ; wie kann Forschung sie beschützen ; Begleitheft zum Vortrag [am 26. November 2008] (2008)
    Kiel : Ozean der Zukunft, Die Kieler Meereswissenschaften
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Book
    Pages: [16] S. , Ill.
    Series Statement: Kinder- und Schüleruni Kiel : für Schülerinnen und Schüler von 12 bis 16 Jahren 2008.11,26
    Language: German
    Note: Auch als elektronisches Dokument vorh
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  • 12
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    Idiopathic iron overload in a harbor seal (Phoca vitulina) (2018)
    American Association of Zoo Veterinarians
    In:  Journal of Zoo and Wildlife Medicine, 49 (3). pp. 770-773.
    Details
    Publication Date: 2021-02-08
    Description: Iron overload has been described in various wild species. The majority of cases involve captive animals, often associated with increased dietary iron uptake. Here a case of idiopathic iron overload in a female adult harbor seal under human care is presented. The animal displayed a progressive anorexia, apathy, and increased serum iron levels. Radiographs showed radiopaque foreign bodies in the stomach. The seal died during an elective laparotomy. Twenty-five coins and two metal rings were removed from the stomach. Histopathologic examination revealed iron storage without cellular damage in liver, spleen, kidney, and pulmonary and mesenteric lymph nodes. Atomic absorption spectrophotometry analysis for iron revealed values thirty times above the reference ranges in spleen and liver; however, the coins only contain minor levels (parts per million) of iron. The etiology of the iron overload in this animal remains unclear. A multifactorial process cannot be excluded.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1638/2017-0132.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 13
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    Beached bachelors: An extensive study on the largest recorded sperm whale Physeter macrocephalus mortality event in the North Sea (2018)
    Public Library of Science
    In:  PLoS ONE, 13 (8). e0201221.
    Details
    Publication Date: 2021-02-08
    Description: Between the 8th January and the 25th February 2016, the largest sperm whale Physeter macrocephalus mortality event ever recorded in the North Sea occurred with 30 sperm whales stranding in five countries within six weeks. All sperm whales were immature males. Groups were stratified by size, with the smaller animals stranding in the Netherlands, and the largest in England. The majority (n = 27) of the stranded animals were necropsied and/or sampled, allowing for an international and comprehensive investigation into this mortality event. The animals were in fair to good nutritional condition and, aside from the pathologies caused by stranding, did not exhibit significant evidence of disease or trauma. Infectious agents were found, including various parasite species, several bacterial and fungal pathogens and a novel alphaherpesvirus. In nine of the sperm whales a variety of marine litter was found. However, none of these findings were considered to have been the primary cause of the stranding event. Potential anthropogenic and environmental factors that may have caused the sperm whales to enter the North Sea were assessed. Once sperm whales enter the North Sea and head south, the water becomes progressively shallower (〈40 m), making this region a global hotspot for sperm whale strandings. We conclude that the reasons for sperm whales to enter the southern North Sea are the result of complex interactions of extrinsic environmental factors. As such, these large mortality events seldom have a single ultimate cause and it is only through multidisciplinary, collaborative approaches that potentially multifactorial large-scale stranding events can be effectively investigated.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1371/journal.pone.0201221
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 14
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    Options for modulating intra-specific competition in colonial pinnipeds: the case of harbour seals (Phoca vitulina) in the Wadden Sea (2015)
    PeerJ
    In:  PeerJ, 3 . e957.
    Details
    Publication Date: 2019-01-23
    Description: Colonial pinnipeds may be subject to substantial consumptive competition because they are large, slow-moving central place foragers. We examined possible mechanisms for reducing this competition by examining the diving behaviour of harbour seals (Phoca vitulina) after equipping 34 seals (11 females, 23 males) foraging from three locations; Romo, Denmark and Lorenzenplate and Helgoland, Germany, in the Wadden Sea area with time-depth recorders. Analysis of 319,021 dives revealed little between-colony variation but appreciable inter-sex differences, with males diving deeper than females, but for shorter periods. Males also had higher vertical descent rates. This result suggests that males may have higher overall swim speeds, which would increase higher oxygen consumption, and may explain the shorter dive durations compared to females. Intersex variation in swim speed alone is predicted to lead to fundamental differences in the time use of three-dimensional space, which may help reduce consumptive competition in harbour seals and other colonial pinnipeds.
    Type: Article , PeerReviewed
    Format: text
    Format: other
    Format: other
    DOI: 10.7717/peerj.957
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 15
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    The current status of harbour porpoises (Phocoena phocoena) in German waters (1998)
    Urban & Fischer
    In:  Archive of Fishery and Marine Research, 46 (2). pp. 97-123.
    Details
    Publication Date: 2021-05-12
    Description: The harbour porpoise (Phocoena phocoena) is the most common cetacean in German waters. Since 1990 all strandings on German coasts, by-catches from German fishermen and incidental sightings have been recorded and examined. In addition, surveys have been conducted in specific areas. In this paper, we present data from these investigations until 1994. The distribution of dead stranded animals along the German North Sea coast clearly shows a decrease in density from north to south. The analyses of incidental sightings in the German Bight and Kiel Bight show similar results. Food analyses revealed that animals from the North and Baltic Seas differ considerably in their diet. Reproduction is seasonal, with parturition and copulation occurring in late spring and early summer. Most female porpoises become sexually mature at the age of four years and become pregnant each year thereafter. The majority of lesions found at necropsies were caused by parasites, especially in the respiratory tract. In two thirds of the cases we found various degrees of pneumonia, associated with parasites. Our findings gave no indication of an epidemic of bacterial or viral infections.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 16
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    Grundlagen und Erläuterungen für den Gebrauch der Steckbriefe (2012)
    Bundesamt für Naturschutz
    In:  In: Bedrohte Biodiversität in der deutschen Nord- und Ostsee: Empfindlichkeiten gegenüber anthropogenen Nutzungen und den Effekten des Klimawandels. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Bundesamt für Naturschutz, Bonn, Germany, pp. 27-41. ISBN 978-3-7843-4016-6
    Details
    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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  • 17
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    All at sea with animal tracks; methodological and analytical solutions for the resolution of movement (2007)
    Elsevier
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 54 . pp. 193-210.
    Details
    Publication Date: 2020-08-05
    Description: Determining the movement of marine animals is logistically difficult and is currently primarily based on VHF and satellite-tracking telemetry, GPS, acoustic telemetry, and geolocation, all of which have substantial limitations in accurately locating the fine-scale movements of these animals. A recent development—that of dead-reckoning—is being increasingly used to examine the fine-scale movement of animals underwater. The advantages and drawbacks of this approach are quite different to those incurred by the other methods. This paper considers the advances that deadreckoning can bring to the study of the often cryptic movement and behaviour of marine animals at sea. Methods used in determining position via dead-reckoning are presented and consideration is given to results derived from the use of deadreckoning on cetaceans, pinnipeds, penguins and sea turtles; these are complemented by data on cormorants and albatrosses acquired using GPS systems. Suggestions are made as to how movement data derived from these devices can be analysed using indices that allow interpretation over a large variety of temporal and spatial scales.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.dsr2.2006.11.017
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 18
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    Reading guide to the species and habitat profiles (2012)
    Federal Agency for Nature Conservation
    In:  In: Threatened Biodiversity in the German North and Baltic Seas: Sensitivities towards Human Activities and the Effects of Climate Change. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Federal Agency for Nature Conservation, Bonn, Germany, pp. 27-41. ISBN 978-3-7843-4017-3
    Details
    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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  • 19
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    Putative origin and maternal relatedness of male sperm whales (Physeter macrocephalus) recently stranded in the North Sea (2018)
    Elsevier
    In:  Mammalian Biology, 88 . pp. 156-160.
    Details
    Publication Date: 2020-01-02
    Description: The globally distributed sperm whale (Physeter macrocephalus) has a partly matrilineal social structure with predominant male dispersal. At the beginning of 2016, a total of 30 male sperm whales stranded in five different countries bordering the southern North Sea. It has been postulated that these individuals were on a migration route from the north to warmer temperate and tropical waters where females live in social groups. By including samples from four countries (n = 27), this event provided a unique chance to genetically investigate the maternal relatedness and the putative origin of these temporally and spatially co-occuring male sperm whales. To utilize existing genetic resources, we sequenced 422 bp of the mitochondrial control region, a molecular marker for which sperm whale data are readily available from the entire distribution range. Based on four single nucleotide polymorphisms (SNPs) within the mitochondrial control region, five matrilines could be distinguished within the stranded specimens, four of which matched published haplotypes previously described in the Atlantic. Among these male sperm whales, multiple matrilineal lineages co-occur. We analyzed the population differentiation and could show that the genetic diversity of these male sperm whales is comparable to the genetic diversity in sperm whales from the entire Atlantic Ocean. We confirm that within this stranding event, males do not comprise maternally related individuals and apparently include assemblages of individuals from different geographic regions.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.mambio.2017.09.003
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 20
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    Pottwalstrandungen Anfang 2016 in Deutschland (2016)
    In:  [Talk] In: Medieninformation der Nationalparkverwaltung, Multimar Wattforum, 23.03.2016, Tönning, Germany .
    Details
    Publication Date: 2017-09-25
    Type: Conference or Workshop Item , NonPeerReviewed
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