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| Billiones, R.G.; Tackx, M.L.M.; Flachier, A.T.; Zhu, L.; Daro, M.H.. |
| The performance of image analysis in measuring suspended particulate matter concentrations was compared with that of the Coulter counter in different samples including latex spheres, diatoms and natural estuarine waters. The two techniques gave comparable numerical concentrations. Image analysis results also correlated positively with dry weight measurements of estuarine suspended particulate matter samples. The conversion of particle areas measured by image analysis into volumes was addressed by trying to determine the average height of the particles. This was done by plotting volume concentrations from the Coulter counter against area concentrations from image analysis. The resulting linear relationships were found to be significant in homogeneous... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Image analysis; Image analysis; Image analysis. |
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3992 |
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| Tackx, M.L.M.; Zhu, L.; De Coster, W.; Billones, R.G.; Daro, M.H.. |
| Although estuarine zooplankters are generally believed to be detritivorous, high clearance rates by the estuarine copepods <i>Eurytemora affinis</i> and <i>Acartia tonsa</i> on natural estuarine microplankton have been reported in the literature. In order to enable detection of possible selectivity for these microplankton organisms over detritus, a method that measures clearance rates on total particulate matter is proposed. Image analysis is used to measure copepod gut contents, and combined with Coulter counter measurements of total particulate matter concentration, allows one to calculate clearance rates on the latter. The first results indicate that, in the Westerschelde estuary (SW Netherlands), both <i>E.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Estuarine organisms; Feeding behaviour; Image processing; Selective feeding; Acartia tonsa; Copepoda [copepods]; Eurytemora affinis. |
| Ano: 1995 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2632 |
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| Tackx, M.; Irigoien, X.; Daro, N.; Castel, J.; Zhu, L.; Zhang, X.; Nijs, J.. |
| As in most European estuaries, the mesoplankton of the Westerschelde and the Gironde is dominated by calanoid copepods. In the Westerschelde, <i>Eurytemora affinis</i> dominates the brackish water area between station 7 and 10 in winter and spring while <i>Acartia tonsa</i> is dominant in summer. Maximum abundance of <i>A. tonsa</i> is located slightly more seawards than that of <i>E. affinis</i>. <i>Acartia bifilosa</i> occurs in winter and spring in lower abundances than <i>A. tonsa</i> and its maximum abundance is located between the brackish and the marine area. In the Gironde, <i>E. affinis</i> dominates in winter and spring between station J and K, with its maximum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acartia (Acanthacartia) bifilosa (Giesbrecht; 1881 Acartia (Acanthacartia) tonsa Dana; 1849 Eurytemora affinis. |
| Ano: 1995 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2631 |
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