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  • 1995-1999  (6)
Document type
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Deep-breathing cephalopods? (1996)
    [s.l.] : Nature Publishing Group
    Nature 384 (1996), S. 421-421 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR — Madan and Wells1 have explored the relationship between gill area and habitat depth. They suggest that the large gill areas found in some pelagic cephalopods enable them to cope with the hypoxic conditions present throughout much of the deep sea. This conclusion is not surprising as ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/384421b0
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Vampire blood: respiratory physiology of the vampire squid (Cephalopoda: Vampyromorpha) in relation to the oxygen minimum layer (1999)
    Springer
    Experimental biology online 4 (1999), S. 1-10 
    Details
    ISSN: 1430-3418
    Keywords: Deep sea ; Haemocyanin ; Hypoxia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The functional properties of the haemocyanin ofVampyroteuthis infernalis (Cephalopoda: Vampyromorpha), measured at 5 °C, are reported and discussed in relation to hypoxia. The oxygen affinity of this haemocyanin (P50=0.47−0.55 kPa) is higher than any previously measured for a cephalopod. The high cooperativity (n50=2.20−2.23) and Bohr coefficient (−0.22) suggest a true transport function for this haemocyanin. This high-affinity haemocyanin, in conjunction with moderate gill diffusion capacity, provides a sufficient oxygen gradient from the environment to the blood to support the low routine oxygen consumption rate of V. infernalis
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00898-999-0001-2
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Unknown
    Short communication. Statolith microstructure from hatchlings of the oceanic squid, Gonatus onyx (Cephalopoda, Gonatidae) from the Northeast Pacific (1999)
    Oxford Univ. Press
    In:  Journal of Plankton Research, 21 (2). pp. 401-404.
    Details
    Publication Date: 2021-06-16
    Description: Statolith microstructure was studied in hatchlings of deepwater-spawned gonatid squid Gonatus onyx, caught between 1350 and 1420 m over a bottom depth of 2100 m in the San Clemente Basin off San Diego, California. It was found that the shape and size of the hatchling statolith were similar to those of the first-check statolith observed in paralarvae and small juveniles of G.onyx. The inner part of the bipartite postnuclear zone (= first-check statolith) is formed during late embryo-genesis, and the first check within the statolith microstructure must be considered as a starting point of increment counting for age estimation of Gonatus
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/plankt/21.2.401
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Unknown
    Flight of the vampire: ontogenetic gait-transition in vampyroteuthis infernalis (Cephalopoda: vampyromorpha) (1998)
    Company of Biologists
    In:  Journal of Experimental Biology, 201 (16). pp. 2413-2424.
    Details
    Publication Date: 2021-06-15
    Description: Vampyroteuthis infernalis is a cosmopolitan cephalopod that lives in the oxygen minimum layer between 600 and 800 m depth. Morphometric and physiological studies have indicated that V. infernalis has little capacity for jet propulsion and has the lowest metabolic rate ever measured for a cephalopod. Because fin swimming is inherently more efficient than jet propulsion, some of the reduction in energy usage relative to other cephalopods may result from the use of fins as the primary means of propulsion. V. infernalis undergoes a rapid metamorphosis which consists of changes in the position, size and shape of the fins. This suggests that there are changes in the selective factors affecting locomotion through ontogeny. The present study describes these changes in relation to models for underwater 'flight'. Citrate synthase (CS) and octopine dehydrogenase (ODH) activities, indicative of aerobic and anaerobic metabolism, respectively, were measured in fin, mantle and arm tissue across a range of body size of four orders of magnitude. The low enzymatic activities in both posterior and anterior fin tissue and the relatively high activity in mantle muscle prior to metamorphosis indicate that jet propulsion using mantle contraction is the primary means of propulsion in juvenile V. infernalis. The increase in CS activity with size after metamorphosis suggests an increased use of the fins for lift-based propulsion. Fin swimming appears to be the primary means of propulsion at all adult sizes. The negative allometry of CS activity in mantle and arm muscle is consistent with the scaling of oxygen consumption previously measured for V. infernalis and with the scaling of aerobic metabolism observed in most animals. The unusual positive allometry of fin muscle CS activity suggests that the use of fins is either relatively more important or more costly in larger animals. Positive scaling of ODH activity in all tissues suggests that fin propulsion, jet propulsion and medusoid 'bell-swimming' are all important for burst escape responses. Enzyme activities in Cirrothauma murrayi are consistent with fin-swimming observed from submersibles, while those in Opisthoteuthis californiana suggest a strong reliance on medusoid swimming using the arms. The transition from jet propulsion to paired-fin 'flight' with increasing body size in Vampyroteuthis infernalis appears functionally to be an ontogenetic 'gait-transition'.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1242/jeb.201.16.2413
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Unknown
    Vampire blood: respiratory physiology of the vampire squid (Cephalopoda: Vampyromorpha) in relation to the oxygen minimum layer (1999)
    Springer
    In:  Experimental Biology Online, 4 (1). pp. 1-10.
    Details
    Publication Date: 2021-07-05
    Description: The functional properties of the haemocyanin ofVampyroteuthis infernalis (Cephalopoda: Vampyromorpha), measured at 5 °C, are reported and discussed in relation to hypoxia. The oxygen affinity of this haemocyanin (P50=0.47−0.55 kPa) is higher than any previously measured for a cephalopod. The high cooperativity (n50=2.20−2.23) and Bohr coefficient (−0.22) suggest a true transport function for this haemocyanin. This high-affinity haemocyanin, in conjunction with moderate gill diffusion capacity, provides a sufficient oxygen gradient from the environment to the blood to support the low routine oxygen consumption rate of V. infernalis.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00898-999-0001-2
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
    facet.materialart.
    Unknown
    Deep-breathing cephalopods? (1996)
    Nature Publishing Group
    In:  Nature, 384 (6608). p. 421.
    Details
    Publication Date: 2021-08-20
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/384421b0
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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