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Foraminifer-based coral reef health assessment for southwestern Atlantic offshore archipelagos, Brazil

Catia F. Barbosa, Beatrice P. Ferreira, Jose Carlos S. Seoane, Patricia Oliveira-Silva, Ana Lidia B. Gaspar, Renato C. Cordeiro and Abilio Soares-Gomes
Foraminifer-based coral reef health assessment for southwestern Atlantic offshore archipelagos, Brazil
Journal of Foraminiferal Research (April 2012) 42 (2): 169-183

Abstract

Benthic foraminiferal assemblages can indicate the ecological status of coral-reef ecosystems. Their functional groups have been used to calculate the previously published FORAM Index (FI), which is based on total counts (living and dead) to indicate whether an environment is suitable to support prolific calcification by organisms that are dependent upon algal endosymbionts. Sediment was sampled from the Archipelago of Fernando de Noronha and the Abrolhos Archipelago and Parcel, which harbor important coral reef communities off the NE and E coasts of Brazil. Quantifying live specimens and taphonomic features of Amphistegina spp., along with the FI in 2005 and monitoring of the percentage of coral cover from 2002-2009, provided an assessment of coral reef health, which was mapped for both areas. Results indicated that FI was good (>4) in half of the sampled stations, but no living Amphistegina was found in the Abrolhos Archipelago and Parcel, possibly indicating recently unfavorable conditions there. These findings suggest that palimpsest sediment can disguise FI so that, in some cases, the index fails to correlate with coral cover. A more realistic approach can be obtained by using the living counts of Amphistegina and their taphonomy to augment the ecological results from the FI.


ISSN: 0096-1191
EISSN: 1943-264X
Coden: JFARAH
Serial Title: Journal of Foraminiferal Research
Serial Volume: 42
Serial Issue: 2
Title: Foraminifer-based coral reef health assessment for southwestern Atlantic offshore archipelagos, Brazil
Affiliation: Universidade Federal Fluminense, Departamento de Geoquimica, Rio de Janeiro, Brazil
Pages: 169-183
Published: 201204
Text Language: English
Publisher: Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States
References: 72
Accession Number: 2012-075398
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Supplemental information/data is available in the online version of this article; includes 5 appendices
Illustration Description: illus. incl. sketch maps
S03°49'60" - S03°49'60", W32°25'60" - W32°25'60"
S17°58'00" - S17°58'00", W38°42'00" - W38°42'00"
Secondary Affiliation: Universidade Federal de Pernambuco, BRA, BrazilUniversidade Federal do Rio de Janeiro, BRA, Brazil
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cushman Foundation for Foraminiferal Research. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201239
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