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Carbonate Production by Benthic Communities on Shallow Coralgal Reefs of Abrolhos Bank,Brazil
Authors:Vanessa Moura dos Reis  Cláudia Santiago Karez  Rodrigo Mariath  Fernando Coreixas de Moraes  Rodrigo Tomazetto de Carvalho  Poliana Silva Brasileiro  Ricardo da Gama Bahia  Tito Monteiro da Cruz Lotufo  Laís Vieira Ramalho  Rodrigo Le?o de Moura  Ronaldo Bastos Francini-Filho  Guilherme Henrique Pereira-Filho  Fabiano Lopes Thompson  Alex Cardoso Bastos  Leonardo Tavares Salgado  Gilberto Menezes Amado-Filho
Abstract:The abundance of reef builders, non-builders and the calcium carbonate produced by communities established in Calcification Accretion Units (CAUs) were determined in three Abrolhos Bank shallow reefs during the period from 2012 to 2014. In addition, the seawater temperature, the irradiance, and the amount and composition of the sediments were determined. The inner and outer reef arcs were compared. CAUs located on the inner reef shelf were under the influence of terrigenous sediments. On the outer reefs, the sediments were composed primarily of marine biogenic carbonates. The mean carbonate production in shallow reefs of Abrolhos was 579 ± 98 g m-2 y-1. The builder community was dominated by crustose coralline algae, while the non-builder community was dominated by turf. A marine heat wave was detected during the summer of 2013–2014, and the number of consecutive days with a temperature above or below the summer mean was positively correlated with the turf cover increase. The mean carbonate production of the shallow reefs of Abrolhos Bank was greater than the estimated carbonate production measured for artificial structures on several other shallow reefs of the world. The calcimass was higher than the non-calcareous mass, suggesting that the Abrolhos reefs are still in a positive carbonate production balance. Given that marine heat waves produce an increase of turf cover on the shallow reefs of the Abrolhos, a decrease in the cover represented by reef builders and shifting carbonate production are expected in the near future.
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