Experimental field study of the effects of crude oil, drill cuttings and natural biodeposits on microphyto- and macrozoobenthic communities in a Mediterranean area
| Autor: | Christiane Barranguet, Christian Grenz, Marie-Reine Plante-Cuny, Chantal Salen-Picard, E. Alliot, Raphaël Plante |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
chemistry.chemical_classification
Pollution Chlorophyll a education.field_of_study Ecology media_common.quotation_subject Population Sediment Drill cuttings Capitella capitata Aquatic Science Biology biology.organism_classification chemistry.chemical_compound Oceanography chemistry Organic matter education Bay Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Marine Biology. 117:355-366 |
| ISSN: | 1432-1793 0025-3162 |
| DOI: | 10.1007/bf00345681 |
| Popis: | Effects of an experimental pollution by neogenous and fossil organic matter on microphyto- and macrozoobenthic communities were studied in situ over a 1 yr period (July 1989 to May 1990) in a shallow microtidal bay (Gulf of Fos, south coast of France). Three experimental enclosures of 1 m2 non-defaunated sediments were covered with 1 cm of polluted defaunated sediments. The sediment in one enclosure contained natural biodeposits with a high organic matter content (BD), that in a second enclosure contained Arabian light crude oil (BAL), and the sediment in the third enclosure contained diesel oil-based cuttings (CUT). Pollution by contaminants did not prevent microphytobenthos from colouizing sediments. Population changes over time were quite similar in all enclosures, except in CUT, where a four times higher chlorophyll a content appeared to be related to a decreased number of grazers and consequently lower grazing rates of animals. Toxicity to the fauna was immediate in the case of BAL and occurred within 3 mo at CUT. Opportunistic species settled in all contaminated sediments; this occurred quite rapidly in BD and BAL which recovered within 3 mo to levels comparable with control sediments. In CUT, natural populations had not recovered after 1 yr, whereas a quasi-monospecific population of Capitella capitata was still present. During the first 3 mo, the oxygen demand of the sediment was higher in oil-contaminated sediments than in controls. On the whole, the changes in fluxes and organism assemblages in our weakly tidal area appear to be consistent with other findings in macrotidal seas. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink