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Does The Marine Macrobenthos Community Recover After An Oil Spill? 10 Years Since The Nissos Amorgos Disaster In Venezuelan Gulf, Caribbean Sea | 9465
Journal of Marine Science: Research & Development
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In 1997, 25.000 barrels of petroleum were spilled along 40 Km of marine costs in Venezuelan Gulf, where we carried out, two
years before, benthonic macro invertebrates (BMI) inventories. In order to monitor the ecosystem "recovery", we repeated
inventories five (2003) and 10 years (2011) later. Before the spill, the BMI community was constituted by 75 species: 30 gastropod
mollusks (GM), 28 bivalve mollusks (BM), 11 annelids (A) and 6 crustaceans (C). After five years this conformation became
27GM, 26BM, 5A and 3C. Although diversity only decreased 16% (12 species), the composition changed: out of the 75 MIB before
the spill, only reappeared 31% (10BM, 9GM, 3A and 1C). This meant a reduction of 69% of the originally present species (OPS).
After 10 years, the diversity increased 1.76 times (122 species: 48BM, 36GM, 19C and 17A, plus 2 new Echinoderm species. Out
of these 122 species only 36 were OPS (16BM, 15GM, 4C and 1A). Therefore, 52% of the OPS remain without returning. Our
results contradict the classic theory of marine ecosystem recovery affected by oil spills, ie.
To return to its "original condition" are
required 2-3 years
. Indeed, this investigation indicates that recovery of Ca?o Sagua BMI community will take at least one more
decade. But, will the BMI return to their original condition? The probability is extremely low. The most likely scenario will be,
at a time difficult to estimate, a new assemblage of BMI species in equilibrium, with a mixture of OPS and new ones. This means
that, in terms of the original ecosystem condition, BMI will never recover since the its trophic structure never will be the same.
Hector Severeyn was the first biologist of Universidad del Zulia (1983), completed a Master in Science (1990) and a Doctoral degree (1993) at The
University of Maryland, College Park, USA., and postdoctoral positions at Texas A&M University, College Station, USA (1998) and Florida Institute
of Technology, USA (2010-2011). At present is a Emeritus Professor of University of Zulia and member of the Editorial Board of the scientific journal
CIENCIA. He has published more than 40 scientific papers and attended to more than 100 congress, conferences and meetings around the world.