Abstract
A short-term short-scale field manipulation experiment was designed to assess the effects of total or partial defaunation, by sediment drying or diesel oil respectively, on polychaete recolonization rates in mangrove sediments of Paranaguá Bay, SE Brazil. After replacement of defaunated cores in the field, disturbed and adjacent undisturbed control sites were subsequently sampled together with adjacent undisturbed control sites on different dates over a 64-day period. Analyses of variance were carried out to test for differences in polychaete populational densities among experimental treatments and sampling dates. Examination of cores impacted by oil showed that most polychaete species kept rather active, quickly reacting to mechanical or light stimuli or moving rapidly. Polychaete recolonization of local mangroves after small-scale disturbance by oil was a fast process, in contrast to that following total defaunation by sediment drying. Rapid recolonization was largely dependent upon the differing mobility of adults of individual species from unaffected areas nearby, epifaunal crawlers or infaunal predators exhibiting the most rapid recovery rates. Conversely, the slow-paced recolonization of completely defaunated areas was due to the modification of sediment properties by drying and to the absence of larvae or juveniles of local species during the experiment.
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Faraco, L.F.D., da Cunha Lana, P. (2003). Response of polychaetes to oil spills in natural and defaunated subtropical mangrove sediments from Paranaguá bay (SE Brazil). In: Sigvaldadóttir, E., et al. Advances in Polychaete Research. Developments in Hydrobiology, vol 170. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0655-1_30
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DOI: https://doi.org/10.1007/978-94-017-0655-1_30
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