[Coral-List] large reef system off the mouth of the Amazon river
douglasfennertassi at gmail.com
Sat Apr 23 21:51:46 EDT 2016
Massive coral reef discovered in the Amazon River
Scientists astonished by huge coral reef found in the Amazon
Reef larger than Delaware found at the mouth of the Amazon river
All 3 above are open-access. The reefs are on the continental shelf, in
the area where the Amazon empties into the Atlantic. They are NOT IN the
river. There are areas that have carbonate buildups, some extend upward as
far as 30 m from the bottom. The carbonate sampled from the surface of the
bottom was mostly built by organisms other than coral. 12 species of coral
were found at low densities and cover. Sponges and rhodoliths are the most
common components of the biological community and the authors referred to
these as marginal reef systems. None of the popular stories above point
out that since fresh water floats and these reefs are on the bottom, so the
reefs are actually in saltwater. They do get a lot of sediment and have
low light levels due to sediment, it appears. If you look at the map, it
is indeed a system of many reefs, not a single reef as some of the
headlines seem to suggest (just as the "Great Barrier Reef" is a system of
a couple thousand or so individual reefs, not a single reef).
The original article is:
An extensive reef system at the Amazon River mouth.
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