| Autor: |
Alan G. Lewis, Paul H. Whitfield |
| Rok vydání: |
1976 |
| Předmět: |
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| Zdroj: |
Estuarine and Coastal Marine Science. 4:255-266 |
| ISSN: |
0302-3524 |
| DOI: |
10.1016/0302-3524(76)90059-1 |
| Popis: |
Organic material present in natural waters and in sediments was found to act in a manner which alters the availability of trace metals to the prefeeding stages of a calanoid copepod ( Euchaeta japonica Marukawa). In the laboratory, survival of the organism was found to decrease with a decrease in the amount of u.v. photo-oxidizable material. Replacement of the material with a known chelating agent (ethylenediaminetetraacetic acid; EDTA) increased survival. Comparison of survival in untreated water with that in different EDTA concentrations provided an EDTA equivalent value which was used to indicate the natural complexing ability of the water. An EDTA equivalent value was also obtained for saltwater extracts of bottom sediments. Examination of a coastal fjord over a year indicates that the natural complexing ability of the deep water increases after a major intrusion of deep water and decreases with increasing residence time of the water. In contrast, the complexing ability of saltwater extractable material in bottom sediments appears to be dependent upon nearsurface productivity. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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