Search Results - (Author, Cooperation:E. Verheyen)

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    American Association for the Advancement of Science (AAAS)
    Published 2014
    Staff View
    Publication Date:
    2014-05-24
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Animals ; Biology/*methods ; Classification/*methods ; *Endangered Species ; *Extinction, Biological
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  2. 2
  3. 3
    Knaepkens, G. ; Verheyen, E. ; Galbusera, P. ; Eens, M.

    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Published 2004
    Staff View
    ISSN:
    1095-8649
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Biology
    Notes:
    Microsatellite analysis and computer simulations strongly suggested that a culvert, i.e. a connection between two river stretches by a narrow tube underneath an artificial channel, was not a migration barrier for the endangered bullhead Cottus gobio.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  4. 4
    Taylor, M. I. ; Verheyen, E.

    Oxford, UK : Blackwell Publishing Ltd
    Published 2001
    Staff View
    ISSN:
    1095-8649
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Biology
    Notes:
    Small but significant differences were found in allele frequencies among five populations (overall FST estimate (θ)=0·004, P=0·006; overall RST estimate (RHO)=0·019, P〈0·00001) of the demersal cichlid Copadichromis sp.‘virginalis kajose’, collected from five locations in Lake Malawi. Pairwise FST estimates revealed significant differences between the most southerly population (Cape Maclear), and the three most northerly populations (Mbamba Bay, Metangula and Chilola). Pairwise RST estimates also revealed significant differences between some populations, but no geographical pattern was discernible. There was no evidence of isolation by distance using either the shortest straight-line distance between samples, or the distance around the shoreline following a 50 m depth contour. FST estimates were considerably lower than found in previous studies on the mbuna (rock-dwelling species), but higher than those found in a study of three pelagic cichlid species from Lake Malawi. Substructuring in C. sp.‘virginalis kajose’ appears to be on a similar scale to the Atlantic cod.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  5. 5
    Verheyen, E. ; Blust, R. ; Decleir, W.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0300-9629
    Keywords:
    Adaptive radiation ; Aquatic surface respiration ; Cichlidae ; Hypoxia tolerance ; Respiration
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  6. 6
    Verheyen, E. ; Blust, R. ; Decleir, W.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0300-9629
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  7. 7
    Verheyen, E. ; Blust, R. ; Doumen, C.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0300-9629
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  8. 8
    Doumen, C. ; D'Suze, G. ; Verheyen, E. ; Blust, R.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0305-0491
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  9. 9
    Wolf, G. ; Verheyen, E. ; Vlaeminck, A. ; Lemaire, J. ; Decleir, W.
    Springer
    Published 1985
    Staff View
    ISSN:
    1432-1793
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Notes:
    Abstract Adult Sepia officinalis L. were caught in June 1984, in the coastal waters of Wimereux (France). Deposition of the eggs took place in the seawater aquaria of the “Station Marine”. The oxygen consumption of S. officinalis was measured during embryonic and juvenile development. Aerobic metabolism occurs as soon as the early embryonic Stage 21. Oxygen diffuses through the initially thick egg shell; the oxygen level in the perivitelline liquid reaches a maximal value just before hatching (116.7±6.9 mm Hg). Hatchings display only a slight increase in oxygen consumption compared to embryos in the last stage of development. Respiration experiments with 40 d old juveniles showed that oxygen consumption increases with temperature, but is not affected by photoperiod. Experiments under increasing hypoxia revealed that S. officinalis juveniles are good regulators and maintain a constant oxygen consumption in the range of 4 to 7 mg O2l-1. Juveniles successfully recover from an hypoxic stress of 2 mg O2l-1 maintained for 1 h. This suggests that the respiratory pigments (pre-hemocyanins) of 40 d-old juveniles have a high oxygen affinity and/or that these juveniles have the ability to adapt to anaerobic conditions.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  10. 10
    Blust, R. ; Linden, A. ; Verheyen, E. ; Decleir, W.
    Springer
    Published 1988
    Staff View
    ISSN:
    1432-1793
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Notes:
    Abstract The effect of pH on the biological availability of copper to the brine shrimp Artemia franciscana was studied with acclimated and non-acclimated individuals for the pH range 5.5 to 8.5. A chemical speciation model was used to calculate the speciation of copper in a chemically-defined saline solution as a function of pH. The lipid solubility of inorganic copper species was determined in hexadecane/saline and octanol/saline extraction systems. Copper is absorbed across the gut epithelium and accumulation is proportional to time over a 120 min experimental period. The biological availability of copper decreases with a decrease in the pH of the salt solution and a concomitant increase of the cupric ion concentration. Acclimation to the experimental pH has a marked effect on the uptake process, which depends on the buffer used. There is no extraction of copper in hexadecane, but a small amount goes in octanol. There is, however, no direct relation between the accumulation of copper in the shrimps and the extraction of copper in octanol. Multiple regression of the accumulation rates for non-acclimated animals on the calculated copper species concentrations shows that much of the variation in accumulation rate with pH is explained when copper hydroxide and/or copper carbonate species are considered to be the biologically available forms. Alternatively, the observations can be interpreted as the result of competitive binding of protons and copper species for carrier systems.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses