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  • 1
    Electronic Resource
    Electronic Resource
    Genetics Relatedness among east African coelacanths (2005)
    [s.l.] : Nature Publishing Group
    Nature 435 (2005), S. 901-901 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Coelacanths were discovered in the Comoros archipelago to the northwest of Madagascar in 1952. Since then, these rare, ancient fish have been found to the south off Mozambique, Madagascar and South Africa, and to the north off Kenya and Tanzania — but it was unclear whether these are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/435901a
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phonotaxis of male crickets (Gryllus campestris) in a field population as an indication of territorially (Orthoptera: Gryllidae) (1991)
    Springer
    Journal of insect behavior 4 (1991), S. 675-681 
    Details
    ISSN: 1572-8889
    Keywords: male field crickets ; phonotaxis ; territoriality ; population density ; Gryllus campestris ; field study
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048078
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Natural habitat of coelacanths (1990)
    [s.l.] : Nature Publishing Group
    Nature 346 (1990), S. 323-324 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Fifty years after the discovery of living coelacanths, these ancient fish are threatened with extinction within two decades1. Can this famous fish be protected and saved? Almost all (98.6 per cent) of coelacanths have been caught along the west coast of Grande Comore, Western Indian Ocean ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/346323a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Yet more danger for coelacanths (1995)
    [s.l.] : Nature Publishing Group
    Nature 374 (1995), S. 314-314 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - The living coelacanth Latimeria chalumnae is the sole survivor of the old lineage of crossopterygian fishes and is of great importance for evolutionary biology1. Recently coelacanths were assigned to 'category 1' of the Convention of International Trade of Endangered Species ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/374314a0
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  • 5
    Electronic Resource
    Electronic Resource
    CoelacanthLatimeria chalumnae aggregates in caves: first observations on their resting habitat and social behavior (1991)
    Springer
    Environmental biology of fishes 30 (1991), S. 281-286 
    Details
    ISSN: 1573-5133
    Keywords: Living fossil ; Submersible observations ; Actinistian ; Sarcopterygii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis We report first observations on social behavior ofLatimeria chalumnae in its natural environment at around 200 m depth in the Comoro Archipelago, Western Indian Ocean. Coelacanths aggregate in small nonaggressive groups in sheltered lava-caves. They live in open site-attached social systems with individuals occupying large overlapping home ranges of more than 8 km coastline, some for a period of at least 2 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02028843
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  • 6
    Electronic Resource
    Electronic Resource
    Habitat and population size of the coelacanth Latimeria chalumnae at Grand Comoro (1991)
    Springer
    Environmental biology of fishes 32 (1991), S. 287-300 
    Details
    ISSN: 1573-5133
    Keywords: Living fossil ; Crossopterygian ; Social behaviour ; Cave dwelling ; Submersible study ; Home range ; Migration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis In 1987 and 1989 coelacanths were observed for the first time in their natural habitat with the help of submersibles. Coelacanths were found between 150–253 m depth, their preferential depth seems to be around 200 m; the water temperature ranged between 16.5–22.8° C. During the day coelacanths aggregate in small non-aggressive groups in sheltered lava-caves. Caves might be a limiting factor for distribution. At night they leave the caves for hunting by drifting singly along the steep lava slopes. They migrate between different caves located within a large home range covering more than 8 km coastline. Coelacanths are site-attached, some for a period of at least 2 years. Our own observations and earlier catch records show that only the west coast of Grand Comoro is a suitable coelacanth habitat with more structural complexity and prey fish abundance than other coastlines of the island. From our survey we estimated a total coelacanth population off Grand Comoro to be 150–210 individuals; a saturated population would be 370–510 individuals. This small relict population seems to be stable. International protection of coelacanths against commercial interests is needed
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007462
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  • 7
    Electronic Resource
    Electronic Resource
    Locomotion, fin coordination and body form of the living coelacanth Latimeria chalumnae (1992)
    Springer
    Environmental biology of fishes 34 (1992), S. 329-356 
    Details
    ISSN: 1573-5133
    Keywords: Locomotory pattern ; Fast start ; Stroke amplitudes ; Velocity ; Paleoethological predictions ; Evolutionary changes ; Lungfish ; Tetrapods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Locomotion and fin coordination of the only living crossopterygian fish Latimeria chalumnae were studied with submersibles in the fish's natural habitat at around 200 m depth off Grand Comoro, western Indian Ocean. Latimeria is a highly specialized predatory fish adapted for nocturnal drift hunting with good fast start capability. Twelve different forward movements and manoeuvres were found and described. The movements of the paired and unpaired fins were analysed. Propulsion was accomplished with downstrokes of the pectoral fins and right-left or left-right strokes of the unpaired lobed fins. The paired fins were not used for walking on the bottom. Swimming velocity, stroke amplitudes and stroke duration were analysed from films and videos taken in the wild. Stroke duration of the paired and unpaired lobed fins was similar and varies between 1.9 to 5.8 sec. Paired fins alternated synchronously. The coordination at approximately ø = 180° between opposite paired fins is stable and independent of locomotory pattern and velocity. A phase deviation of about 90°–100° exists between paired and unpaired fins. A model is developed that describes the functional implication of this deviation as a method of producing a steady swimming performance which smooths recoil movements and prevents rotation of the body. The novel slow and fast swimming mode of Latimeria is named in accordance with Breder's (1926) descriptive nomenclature as ‘coelacanthiform’. This study indicates a primary swimming function for the primitive sarcopterygian fin and confirms earlier evolutionary assumptions of a more open-water life style of coelacanth fishes. Paleoethological models of the walking habits of Latimeria have to be rejected. Synchronous alternation of paired fins originating from hydrodynamic demands could be a pre-adaptation and a shared derived character in sarcopterygian fishes that facilitated the fish-tetrapod transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004739
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  • 8
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    Isotope analysis and heat flow measurements of Maria S. Merian cruise MSM21/4 on the western Svalbard margin (2014)
    PANGAEA
    In:  Supplement to: Berndt, Christian; Feseker, Tomas; Treude, Tina; Krastel, Sebastian; Liebetrau, Volker; Niemann, Helge; Bertics, Victoria J; Dumke, Ines; Dünnbier, Karolin; Ferre, Benedicte; Graves, Carolyn; Gross, Felix; Hissmann, Karen; Hühnerbach, Veit; Krause, Stefan; Lieser, Kathrin; Schauer, Jürgen; Steinle, Lea (2014): Temporal constraints on hydrate-controlled methane seepage off Svalbard. Published Online January 2 2014, Science, https://doi.org/10.1126/science.1246298
    Details
    Publication Date: 2023-03-03
    Description: Methane hydrate is an ice-like substance that is stable at high-pressure and low temperature in continental margin sediments. Since the discovery of a large number of gas flares at the landward termination of the gas hydrate stability zone off Svalbard, there has been concern that warming bottom waters have started to dissociate large amounts of gas hydrate and that the resulting methane release may possibly accelerate global warming. Here, we can corroborate that hydrates play a role in the observed seepage of gas, but we present evidence that seepage off Svalbard has been ongoing for at least three thousand years and that seasonal fluctuations of 1-2°C in the bottom-water temperature cause periodic gas hydrate formation and dissociation, which focus seepage at the observed sites.
    Keywords: Center for Marine Environmental Sciences; GEOMAR; Helmholtz Centre for Ocean Research Kiel; MARUM
    Type: Dataset
    Format: application/zip, 29 datasets
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    DATA PANGAEA
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