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  • Other Sources  (3)
  • Articles (OceanRep)  (3)
  • Inter Research  (2)
  • ASCE (American Society of Civil Engineers)  (1)
  • 1
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    Effects of ocean acidification on the calcification of otoliths of larval Atlantic cod Gadus morhua (2013)
    Inter Research
    In:  Marine Ecology Progress Series, 477 . pp. 251-258.
    Details
    Publication Date: 2018-06-25
    Description: The growth and development of the aragonitic CaCO3 otoliths of teleost fish could be vulnerable to processes resulting from ocean acidification. The potential effects of an increase in atmospheric CO2 on the calcification of the otoliths were investigated by rearing Atlantic cod Gadus morhua L. larvae in 3 pCO2 concentrations—control (370 µatm), medium (1800 µatm) and high (4200 µatm)—from March to May 2010. Increased otolith growth was observed in 7 to 46 d post hatch (dph) cod larvae at elevated pCO2 concentrations. The sagittae and lapilli were usually largest in the high pCO2 treatment followed by the medium and control treatments. The greatest difference in mean otolith surface area (normalized to fish length) was for sagittae at 11 dph, with medium and high treatments being 46 and 43% larger than the control group, respectively. There was no significant pCO2 effect on the shape of the otoliths nor were there any trends in the fluctuating asymmetry, defined as the difference between the right and left sides, in relation to the increase in otolith growth from elevated pCO2.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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  • 2
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    Species-specific phytoplankton growth rates via diel DNA synthesis cycles. III. Accuracy of growth rate measurements in the dinoflagellate Prorocentrum minimum. (1990)
    Inter Research
    In:  Marine Ecology Progress Series, 63 . pp. 273-279.
    Details
    Publication Date: 2018-05-07
    Description: The accuracy of species-specific phytoplankton growth rates estimated by cell cycle analysis was tested with the dinoflagellate Prorocentrum minimum (Pav.) Sch. under conditions of altered nitrogen and phosphorus availability. Reduced nutrient availability caused major changes in the duration of cell cycle phases. At the nutrient level of complete f/2 media, the length of the combination of S, G2, and M phases was about 8 h at growth rates of 0.53 to 0.56 d-' A decrease in ~ 0 ,o~r N-O3 concentration extended the S+G2+M phase to about 15.5 to 17.7 h at growth rates ranging from 0.41 to 0.30 d-' Changes in phase durations dld not significantly affect growth rate estimates. In addition, a minimum growth rate, calculated from the maximum values on phase fraction curves, was shown to be usable as an error detector in some cases. Results support the validity of cell cycle analysis to measure in situ growth rates.
    Type: Article , PeerReviewed
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  • 3
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    Mathematical Models of Distribution of Sediment Concentration (2000)
    ASCE (American Society of Civil Engineers)
    Details
    Publication Date: 2023-05-24
    Description: Mathematical models have been developed that can completely describe the distribution of sediment concentration from the channel bed to the water surface. These models can be used to estimate the mean (depth-averaged) sediment concentration by a quick, point sampling in river engineering practice. The developed models are products of a combined application of the deterministic and probabilistic concepts. The complementary nature of the two concepts strengthens the methodology of describing the various features of sediment transport. The models incorporate a velocity distribution equation that corresponds to a probability distribution derived by maximizing the information entropy. The probability distribution is a compact description of the system at a channel section, and its resilience or stability explains the applicability of the developed models of velocity and sediment distributions in a wide range of flows, steady or unsteady.
    Type: Article , PeerReviewed
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