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  • 1
    Series available for loan
    Series available for loan
    Fluor im Antarktischen Ökosystem : DFG-Symposium November 1982 (1983)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Details Availability
    Call number: ZSP-168-10
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 74 S. : graph. Darst., Kt.
    Series Statement: Berichte zur Polarforschung 10
    URL: http://hdl.handle.net/10013/epic.10010
    Language: German
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Pygoscelid penguins in a swim canal (1991)
    Springer
    Polar biology 11 (1991), S. 277-282 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In Antarctica, we investigated the energy consumption of Adélie (Pygoscelis adeliae), Gentoo (P. papua) and Chinstrap (P. antarctica) penguins while resting in the water (8.4 W-kg−1) and swimming underwater at various speeds, using a 21m long canal filled with sea-water at 4°C in conjunction with respirometry. The birds swam at will and consumed 15.7, 16.1 and 10 W·kg−1 at the speed where cost of transport was minimal (2.1, 2.3 and 2.5 m·s−1 in Adélie, Gentoo and Chinstrap penguins, respectively). Thermal conductance in pygoscelid penguins was 3.3 W·°C−1. m−2 and energy expenditure (Pi, W·kg−1) while resting in the water is given by Pj = -0.3 ta+9.6, where ta is water temperature in °C. During the breeding season, pygoscelid penguins spend 25–40% of their daily energy expenditure while foraging at sea. The importance of accurate estimates of at-sea activity and energy consumption is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238463
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  • 3
    Electronic Resource
    Electronic Resource
    Depth utilization by Penguins and Gentoo Penguin dive patterns (1991)
    Springer
    Journal of ornithology 132 (1991), S. 47-60 
    Details
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Miniatur-Tiefenmeßgeräte wurden 8 Eselpinguinen angeheftet und die gewonnenen Daten der Aufenthaltsdauer in verschiedenen Wassertiefen untersucht. Die Vögel zeigten zwei Muster der Tiefenausnutzung, (1) abnehmende Aufenthaltsdauer mit zunehmender Wassertiefe, das wir als „Stoßtauchen“ im Pelagial interpretieren und (2) konstante Aufenthaltsdauer pro Tiefenintervall bis in bestimmte Tiefen, in denen lange Verweildauer registriert wurden. Letzteres interpretieren wir als „Grundtauchen“ bei Vögeln, die am Meeresboden nach Nahrung suchen. Aus der Literatur wurden „multiple Tiefenmaxima“ für verschiedene Pinguinarten entnommen und analysiert, um die Aufenthaltsdauer pro Tiefenintervall zu rekonstruieren. Diese Ergebnisse zeigen zusammen mit tatsächlichen Meßdaten, daß die Tiefenausnutzung der Pinguine stark massenabhängig ist, wobei größere Arten eine größeren Zeitanteil in tieferem Wasser verbringen.
    Notes: Summary Time-at-depth data, recorded by animal-attached miniature depth gauges, were examined in 8 Gentoo Penguins. Birds showed two depth utiliuation patterns, (1) decreasing time with increasing depth, which we interpret as due to “bounce-diving” in the pelagic zone and (2) constant time per depth interval down to specific depths where large time peaks were encountered. We interprete this as “flat-bottomed” diving in benthic-foraging birds. Multiple maximum depth data reported in the literature for various penguin species were analysed to try and reconstruct proportional time-at-depth. These results, together with real time-at-depth data, indicated that penguin depth utilization was strongly mass dependent with larger species spending a greater proportion of time in deeper water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01640525
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  • 4
    Electronic Resource
    Electronic Resource
    Der Einfluß der Umweltfaktoren auf das Wachstum und den Häutungsrhythmus der StrandkrabbeCarcinides maenas (1964)
    Springer
    Helgoland marine research 10 (1964), S. 91-103 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Junge Strandkrabben von 4–16 mm Carapaxbreite wurden bis zur Geschlechtsreife unter konstanten Umweltbedingungen aufgezogen. 2. Die Dauer ihrer Häutungsintervalle nimmt bei konstanter Temperatur mit der Körpergröße stetig zu. 3. Die Dauer der Häutungsintervalle hängt von der Temperatur und der Ernährung ab. Von der Tageslänge scheint sie weitgehend unabhängig zu sein. 4. Der relative Grösßenzuwachs bei jeder Häutung ist im gesamten untersuchten Größenbereich und bei den verschiedenen Temperaturen bei allen Häutungen gleich: Bei den Häutungen verdoppelt sich jeweils das Körpervolumen. 5. Augenstielamputationen und Verlust von Extremitäten wirken auf den Häutungsrhythmus in gleicher Weise: Die Schwankungsbreite in der Dauer der Häutungsintervalle ist vermindert. Die Häutungsintervalle sind in 20° C deutlich, in 10° C nur geringfügig verkürzt. 6. Durch die Anwesenheit größerer Artgenossen werden die Häutungen verzögert. Die optische Wahrnehmung spielt dabei keine Rolle. 7. Aus diesen Ergebnissen wird folgendes geschlossen: Der ausschlaggebende Faktor für die Auslösung von Häutungen ist ein bestimmter Größenzuwachs. Temperatur und Ernährung beeinflussen den Häutungsrhythmus dadurch, daß sie das Tempo des Wachstums bestimmen. Die winterliche Häutungsruhe in Freilandpopulationen wird nicht durch den Kurztag bedingt, sondern durch die Kälte. Diese hemmt lediglich das Wachstum, sie verhindert nicht die Häutungen über das häutungshemmende Hormon. Dieses vermindert vielmehr die Temperaturabhängigkeit des Häutungsrhythmus, indem es die Häutungen im Warmen stärker verzögert als im Kalten. Es gestattet die Anpassung des Häutungstermins an die individuelle Lage der Tiere. Es hemmt in Anwesenheit größerer Artgenossen die Häutung. Beim Verlust mehrerer Gliedmaßen wird seine Sekretion eingestellt, so daß die nächste Häutung vorzeitig erfolgt. Das häutungshemmende Hormon bedingt dementsprechend die große individuelle Variation in der Dauer der Häutungsintervalle.
    Notes: Abstract Young crabs (carapace width 4 to 16 mm) were raised under controlled conditions in the laboratory. The time intervals between subsequent moults increase at all test temperatures with increasing body size. The length of intermoult periods varies with temperature and feeding. It is not affected by day length. Moulting takes place as soon as a certain increase in size is attained. In comparable size groups, the amount of this increase is identical in all test temperatures. Moreover, the relation of increase to initial size is constant over the whole size range investigated. The body volume doubles at each moult. Eyestalk amputations and loss of extremities have similar effects: They shorten the intermoult periods at 20° C considerably, but at 10° C they do so only slightly; furthermore, the amplitude of fluctuations is narrowed. The presence of large specimens tends to retard moulting in smaller ones; this response is independent of visual stimuli. The following assumptions are made: Low temperatures retard the moulting rhythm directly by slowing down growth. They are not acting via the moult inhibiting hormone. Loss of several extremities causes a stop of hormone delivery resulting in shortened intermoult periods. Recognition by touch of a larger specimen causes increased hormone delivery and thus retardation of the subsequent moulting process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01626100
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  • 5
    Electronic Resource
    Electronic Resource
    The ultrastructural basis of steroid production in the Y-organ and the mandibular organ of the crabs Hemigrapsus nudus (Dana) and Carcinus maenas L. (1980)
    Springer
    Cell & tissue research 206 (1980), S. 83-94 
    Details
    ISSN: 1432-0878
    Keywords: Carcinus ; Ecdysone ; Hemigrapsus ; Mandibular organ ; Y-organ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the steroid producing Y-organ and the mandibular organ of the crustaceans Hemigrapsus nudus and Carcinus maenas has been studied with reference to the well investigated steroid secreting cells (SSC) of mammals. In accordance with the most important characteristic of mammalian SSC, abundant SER could be shown in the Y-organ, where it is unevenly distributed. The amount of SER seems to vary in correlation with the secretion of moulting hormone during the moult cycle. Most Y-organ cells contain a great number of mitochondria of the tubular type, another important characteristic of mammalian SSC. The ultrastructure of the mandibular organ of C. maenas differs considerably from that of the Y-organ. Some SER was found, mitochondria of unusual shape and size were conspicuous. No definite conclusion as to the function of the mandibular organ is yet to be drawn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233610
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  • 6
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    Dive track profile, intermandibular angel sensor profile and immobilisation data of adult female Weddell seals at Drescher Inlet from expedition DRE2003 (2007)
    PANGAEA
    In:  Supplement to: Liebsch, Nikolai S; Wilson, Rory P; Bornemann, Horst; Adelung, Dieter; Plötz, Joachim (2007): Mouthing off about fish capture: Jaw movement in pinnipeds reveal the real secrets of ingestion. Deep Sea Research Part II: Topical Studies in Oceanography, 54(3-4), 256-269, https://doi.org/10.1016/j.dsr2.2006.11.014
    Details
    Publication Date: 2023-05-12
    Description: Determination of when and where animals feed and how much they consume is fundamental to understand their ecology and role in ecosystems. However, the lack of reliable data on feeding habits of wild animals, and particularly in marine endotherms, attests to the difficulty in doing this. A promising recent development proposes using a Hall sensor-magnet System - the inter-mandibular angle sensor (IMASEN) attached to animals' jaws to elucidate feeding events. We conducted trials on captive pinnipeds by feeding IMASEN-equipped animals with prey to examine the utility of this system. Most feeding events were clearly distinguishable from other jaw movements; only small prey items might not be resolved adequately. Based on the results of this study we examined feeding events from free-ranging Weddell seals fitted with IMASENs and dead-reckoners during December 2003 at Drescher Inlet (Riiser Larsen Ice Shelf, eastern Weddell Sea coast), and present data on prey capture and ingestion in relation to the three-dimensionalmovement patterns of the seals. A total of 19 Weddell seals were immobilised by using a combination of ketamine, xylazine, and diazepam. Eight seals were drugged once, six two times, and two and three were drugged three and four times each, coming to a total of 38 immobilisation procedures. Narcoses were terminated with yohimbine (doi:10.1594/PANGAEA.438931).
    Keywords: ANT-XXI/2, PS65; DRE2003; DRE2003_wed_a_f_01; DRE2003_wed_a_f_02; DRE2003_wed_a_f_03; DRE2003_wed_a_f_04; DRE2003_wed_a_f_05; DRE2003_wed_a_f_06; DRE2003_wed_a_f_07; DRE2003_wed_a_f_08; DRE2003_wed_a_f_09; DRE2003_wed_a_f_10; DRE2003_wed_a_f_11; DRE2003_wed_a_f_12; DRE2003_wed_a_f_13; DRE2003_wed_a_f_14; DRE2003_wed_a_f_15; DRE2003_wed_a_f_16; DRE2003_wed_a_f_17; DRE2003_wed_a_f_18; DRE2003_wed_a_f_19; Drescher Camp; Marine endotherm; Marine Mammal Tracking; MET; MMT
    Type: Dataset
    Format: application/zip, 9 datasets
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    DATA PANGAEA
  • 7
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    The ultrastructural basis of steroid production in the Y-organ and the mandibular organ of the crabs Hemigrapsus nudus (Dana) and Carcinus maenas L. (1980)
    Springer
    Details
    Publication Date: 1980-02-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 8
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    The dynamics of grey seals (Halichoerus grypus) off Amrum in the south-eastern North Sea — evidence of an open population (2002)
    Elsevier
    Details
    Publication Date: 2002-02-01
    Print ISSN: 1385-1101
    Electronic ISSN: 1873-1414
    Topics: Biology , Geosciences , Physics
    Published by Elsevier
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  • 9
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    Pygoscelid penguins in a swim canal (1991)
    Springer
    Details
    Publication Date: 1991-08-01
    Print ISSN: 0722-4060
    Electronic ISSN: 1432-2056
    Topics: Biology
    Published by Springer
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  • 10
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    Der Einfluß der Umweltfaktoren auf das Wachstum und den Häutungsrhythmus der StrandkrabbeCarcinides maenas (1964)
    BioMed Central
    Details
    Publication Date: 1964-10-01
    Print ISSN: 1438-387X
    Electronic ISSN: 1438-3888
    Topics: Biology
    Published by BioMed Central
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