Moura, R.L.; Amado-Filho, G.M.; Moraes, F.C.; Brasileiro, P.S.; Salomon, P.S.; Mahiques, M.M.; Bastos, A.C.; Almeida, M.G.; Silva, J.M.; Araujo, B.F.; Brito, F.P.; Rangel, T.P.; Oliveira, B.C.V.; Bahia, R.G.; Paranhos, R.P.; Dias, R.J.S.; Siegle, E.; Figueiredo, A.G.; Pereira, R.C.; Leal, C.V.; Hajdu, E.; Asp, N.E.; Gregoracci, G.B.; Neumann-Leitao, S.; Yager, P.L.; Francini-Filho, R. .; Froes, A.; Campeao, M.; Silva, B.S.; Moreira, A.P.B.; Oliveira, L.; Soares, A.C.; Araujo, L.; Oliveira, N.L.; Teixeira, J.B.; Valle, R.A.B.; Thompson, C.C.; Rezende, C.E.; Thompson, F.L. (2016). An extensive reef system at the Amazon River mouth. Science Advances. 2 (4): e1501252-e1501252.

230489

10.1126/sciadv.1501252 [view]

Moura, R.L.; Amado-Filho, G.M.; Moraes, F.C.; Brasileiro, P.S.; Salomon, P.S.; Mahiques, M.M.; Bastos, A.C.; Almeida, M.G.; Silva, J.M.; Araujo, B.F.; Brito, F.P.; Rangel, T.P.; Oliveira, B.C.V.; Bahia, R.G.; Paranhos, R.P.; Dias, R.J.S.; Siegle, E.; Figueiredo, A.G.; Pereira, R.C.; Leal, C.V.; Hajdu, E.; Asp, N.E.; Gregoracci, G.B.; Neumann-Leitao, S.; Yager, P.L.; Francini-Filho, R. .; Froes, A.; Campeao, M.; Silva, B.S.; Moreira, A.P.B.; Oliveira, L.; Soares, A.C.; Araujo, L.; Oliveira, N.L.; Teixeira, J.B.; Valle, R.A.B.; Thompson, C.C.; Rezende, C.E.; Thompson, F.L.

2016

2 (4): e1501252-e1501252

Publication

http://advances.sciencemag.org/content/2/4/e1501252.full

Available for editors   [request]

Large rivers create major gaps in reef distribution along tropical shelves. The Amazon River represents 20% of the global riverine discharge to the ocean, generating up to a 1.3 × 106–km2 plume, and extensive muddy bottoms in the equatorial margin of South America. As a result, a wide area of the tropical North Atlantic is heavily affected in terms of salinity, pH, light penetration, and sedimentation. Such unfavorable conditions were thought to imprint a major gap in Western Atlantic reefs. We present an extensive carbonate system off the Amazon mouth, underneath the river plume. Significant carbonate sedimentation occurred during lowstand sea level, and still occurs in the outer shelf, resulting in complex hard-bottom topography. A permanent near-bottom wedge of ocean water, together with the seasonal nature of the plume’s eastward retroflection, conditions the existence of this extensive (~9500 km2) hard-bottom mosaic. The Amazon reefs transition from accretive to erosional structures and encompass extensive rhodolith beds. Carbonate structures function as a connectivity corridor for wide depth–ranging reef-associated species, being heavily colonized by large sponges and other structure-forming filter feeders that dwell under low light and high levels of particulates. The oxycline between the plume and subplume is associated with chemoautotrophic and anaerobic microbial metabolisms. The system described here provides several insights about the responses of tropical reefs to suboptimal and marginal reef-building conditions, which are accelerating worldwide due to global changes.

America, South
Brazil

Ecology
Systematics, Taxonomy

Cnidaria
Porifera
Vertebrata

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