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  • 1
    Keywords: Forschungsbericht ; Meerwasser ; Kohlendioxid ; Versauerung ; Biogeochemie
    Type of Medium: Book
    Pages: 23 S. , Ill., graph. Darst.
    Language: German
    Note: Förderkennzeichen BMBF 03F0608 A-O. - Verbund-Nr. 01073496
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  • 2
    Keywords: Forschungsbericht ; Meerwasser ; Kohlendioxid ; Versauerung ; Biogeochemie
    Type of Medium: Book
    Pages: 23 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Förderkennzeichen BMBF 03F0608 A-O. - Verbund-Nr. 01073496
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  • 3
    Book
    Book
    Cambridge [u.a.] : Cambridge University Press
    Keywords: Marine animals Adaptation ; Polar regions ; Deep-sea animals Adaptation ; Polar regions ; Cold adaptation ; Konferenzschrift 1996 ; Aufsatzsammlung ; Tierökologie ; Kälteanpassung ; Pflanzenökologie ; Polarmeer ; Autökologie ; Meerestiere ; Polarmeer ; Meerestiere ; Kälteanpassung ; Kälte ; Autökologie
    Type of Medium: Book
    Pages: XVII, 498 S. , Ill., graph. Darst., Kt.
    Edition: 1. publ.
    ISBN: 0521580781
    Series Statement: Seminar series / Society for Experimental Biology 66
    DDC: 571.4/641177
    RVK:
    Language: English
    Note: Includes index
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  • 4
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (75 Seiten = 6 MB) , Illustrationen, Graphen
    Edition: 2021
    Language: German
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  • 5
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (97 Seiten = 4 MB) , Illustrationen, Graphen, Karten
    Edition: Online-Ausgabe 2021
    Language: German
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 6
    Online Resource
    Online Resource
    [Bremerhaven] : Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (8 Seiten, 122,02 KB)
    Language: German
    Note: Förderkennzeichen BMBF 01LS1604A , Autoren dem Berichtsblatt entnommen , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 7
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. In the body-wall ofArenicola marina the changes of concentrations of ATP, ADP and AMP, phosphotaurocyamine, succinate, acetate and propionate, alanine and aspartate were estimated during recovery following 24 h of anoxia. The energy charge was calculated from the adenylates. 2. After 24 h of anoxia the energy status which comprises the energy charge and the concentration of phosphotaurocyamine had decreased; the concentrations of succinate, acetate, propionate and alanine were elevated, thus indicating an anaerobic state of the energy metabolism (Table 1). 3. Within 40 min after the onset of aerobic conditions the adenylates showed concentrations typical of an aerobic state (Fig. 1 A); phosphotaurocyamine was replenished by 84% within 1 h (Fig. 1 C); about half of the succinate pool was metabolized within the first 20 min and reached control levels after 1 to 2 h (Fig. 2 B). 4. The accumulation of acetate and propionate continued during the first 30 to 60 min of recovery, but after this the concentrations of these metabolites decreased slowly (Fig. 2 C). 5. Alanine and aspartate concentrations decreased during recovery to approach control levels within 2 h (Fig. 2 A).
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-136X
    Keywords: Opine formation ; Tonic contraction ; Phasic contraction ; Muscle performance ; Energetic efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The contribution of anaerobic metabolism in normoxic and hypoxic anterior byssus retractor muscles (ABRM) to ATP production during tonic and repeated phasic contractions under isotonic conditions was estimated by analysing changes in the levels of ATP, phospho-l-arginine,l-arginine, octopine, alanopine, strombine,l- andd-lactate, succinate,l-aspartate andl- andd-alanine. 1. During tonic contraction under normoxia, elicited by the application of acetylcholine and subsequent washout, muscles depleted the phospho-l-arginine store by 3 μmol·g wet wt−1. The phosphagen was replenished during the maintenance of catch. Formation of anaerobic end products was not observed. The energy demand during repeated phasic contractions elicited in aerated media containing serotonin was not only indicated by a continuous breakdown of the phosphagen but also by decreasing ATP levels and the accumulation of octopine. 2. The energy demand during tonic contraction under hypoxic conditions $$(P_{{\text{O}}_{\text{2}} }〈 10 {\text{Torr)}}$$ was indicated by a breakdown of phosphagen as well as by ATP depletion. During catch, however, ATP was rapidly replenished whereas restoration of the phosphagen pool to control levels was delayed. Octopine and succinate were accumulated during the initial 30 min of catch and remained constant thereafter. The additional anaerobic ATP turnover (ATPt) during the active phase of isotonic contraction was found to be 4.9±1.4 μmol·g wet wt−1 accounting for the work done. An additional ATP turn-over during subsequent catch was not detectable. 3. Hypoxia $$(P_{{\text{O}}_{\text{2}} }〈 10 {\text{Torr)}}$$ did not change the contractility of ABRM during phasic contractions. Energy was provided by means of phosphagen and ATP depletion, by octopine and succinate formation and, in addition, some accumulation of alanopine.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 24 (1994), S. 192-199 
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Die größten wirbellosen Tiere, Riesenkalmare der Gattung Architeuthis, haben die Phantasie des Menschen beflügelt, seit er die Meere befährt. Sie und ihre kleineren Vettern sind die einzigen großen Invertebraten, die das Pelagial, den freien Wasserkörper der Ozeane, als Lebensraum erobert haben und dort eine Position im Ökosystem und in den Nahrungsketten einnehmen, die der von marinen Vertebraten (Fischen und Meeressäugern) vergleichbar ist. Über das Leben der Kalmare ist vor allem dann wenig bekannt, wenn sie wie der Riesenkalmar ein dem Menschen weitgehend verborgenes Leben in der Tiefsee führen. Unsere Kenntnisse sind umfangreicher bei kleineren Formen, die zumindest einen Teil ihres Lebens in den Schelfmeeren und dort in Küstennähe oder in den oberen Wasserschichten verbringen. Einige dieser Arten haben aufgrund der hohen Populationsdichten auch erhebliche fischereiwirtschaftliche Bedeutung erlangt. Diese Kalmare sind in der Regel sehr muskulös und zeigen ein Aktivitätsniveau, das dem ähnlich großer Fische vergleichbar ist oder sogar darüber hinausgeht. Sie schwimmen überwiegend nach dem Rückstoßprinzip, einer energetisch aufwendigen Fortbewegungsweise. Dementsprechend zeigt ihr aerober Stoffwechsel die höchsten Umsatzraten, die bei marinen Invertebraten gefunden wurden, höher auch als die von Fischen vergleichbarer Größe und Lebensweise. Die physiologischen Merkmale, die den Kalmaren der Schelfmeere ihre hohe Leistung ermöglichen und ihnen ihre Position im Ökosystem des Pelagials sichern, sind Gegenstand dieses Übersichtsartikels. Darüber hinaus werden Mechanismen vorgestellt, die es Kalmaren in verschiedenen Lebensträumen ermöglicht haben, die Maximierung ihres Energieverbrauches zu begrenzen.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 2021-02-08
    Description: Productivity of marine fish stocks is known to be affected by environmental and ecological drivers, and global climate change is anticipated to alter recruitment success of many stocks. While the direct effects of environmental drivers on fish early life stage survival can be quantified experimentally, indirect effects in marine ecosystems and the role of adaptation are still highly uncertain. We developed an integrative model for the effects of ocean warming and acidification on the early life stages of Atlantic cod in the Barents Sea, termed SCREI (Simulator of Cod Recruitment under Environmental Influences). Experimental results on temperature and CO2 effects on egg fertilization, egg and larval survival and development times are incorporated. Calibration using empirical time series of egg production, temperature, food and predator abundance reproduces age-0 recruitment over three decades. We project trajectories of recruitment success under different scenarios and quantify confidence limits based on variation in experiments. A publicly accessible web version of the SCREI model can be run under www.oceanchange.uni-bremen.de/;SCREI. Severe reductions in average age-0 recruitment success of Barents Sea cod are projected under uncompensated warming and acidification toward the middle to end of this century. Although high population stochasticity was found, considerable rates of evolutionary adaptation to acidification and shifts in organismal thermal windows would be needed to buffer impacts on recruitment. While increases in food availability may mitigate short-term impacts, an increase in egg production achieved by stock management could provide more long-term safety for cod recruitment success. The SCREI model provides a novel integration of multiple driver effects in different life stages and enables an estimation of uncertainty associated with interindividual and ecological variation. The model thus helps to advance toward an improved empirical foundation for quantifying climate change impacts on marine fish recruitment, relevant for ecosystem-based assessments of marine systems under climate change.
    Type: Article , PeerReviewed
    Format: text
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