1 resultado para Symbol Grounding
em Plymouth Marine Science Electronic Archive (PlyMSEA)
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Resumo:
Calanoid copepod eggs have been extracted from intertidal sediments and hatched in the laboratory. Although most of the eggs which hatched did so within < 7 days, the hatching of some continued over a more prolonged period (> 20 days). This indicates that there were a significant number of diapausing or delayed hatching eggs. The species of calanoids present include some of which are known to produce diapausing eggs. Hatching of nauplii from incubated sediment samples was slower than from the extracted eggs indicating dormancy induced by the effects of burial in the sediment. Viability of the eggs has been related to chronic industrial or urban pollution as indicated by polycyclic aromatic hydrocarbon levels. These hatchings were conducted simultaneously with those for cleaner locations. The viability of eggs was significantly depressed in the more heavily polluted sites. An oil spill arising from the grounding of the "Sea Empress" at Milford Haven, UK, in February 1996 has provided a comparison of the impact of an acute situation with these chronic effects. An immediate drastic reduction in viability was followed by a recovery in the year following the spill. The data have provided no evidence for differences in the response to pollution between diapausing and subitaneous eggs.