Cited by 228Coral and Marine Ecosystems StudiesMarine Biology and Ecology ResearchMarine Ecology and Invasive Species

The Diversity and Biogeography of Western Indian Ocean Reef-Building Corals

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Obura, David·2012·PLoS ONE

Abstract

This study assesses the biogeographic classification of the Western Indian Ocean (WIO) on the basis of the species diversity and distribution of reef-building corals. Twenty one locations were sampled between 2002 and 2011. Presence/absence of scleractinian corals was noted on SCUBA, with the aid of underwater digital photographs and reference publications for species identification. Sampling effort varied from 7 to 37 samples per location, with 15 to 45 minutes per dive allocated to species observations, depending on the logistics on each trip. Species presence/absence was analyzed using the Bray-Curtis similarity coefficient, followed by cluster analysis and multi-dimensional scaling. Total (asymptotic) species number per location was estimated using the Michaelis-Menten equation. Three hundred and sixty nine coral species were named with stable identifications and used for analysis. At the location level, estimated maximum species richness ranged from 297 (Nacala, Mozambique) to 174 (Farquhar, Seychelles). Locations in the northern Mozambique Channel had the highest diversity and similarity, forming a core region defined by its unique oceanography of variable meso-scale eddies that confer high connectivity within this region. A distinction between mainland and island fauna was not found; instead, diversity decreased radially from the northern Mozambique Channel. The Chagos archipelago was closely related to the northern Mozambique Channel region, and analysis of hard coral data in the IUCN Red List found Chagos to be more closely related to the WIO than to the Maldives, India and Sri Lanka. Diversity patterns were consistent with primary oceanographic drivers in the WIO, reflecting inflow of the South Equatorial Current, maintenance of high diversity in the northern Mozambique Channel, and export from this central region to the north and south, and to the Seychelles and Mascarene islands.

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Crossref · 10.1371/journal.pone.0045013

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  • The higher allelic richness in the Northern Mozambique Channel is consistent with the region's higher coral cover and diversity, which can be explained by current patterns (inflow of the South Equatorial Current transporting larvae), high connectivity from mixing in Northern Mozambique Channel eddies, and lower environmental stress than north of the region.

    “These results are consistent with the higher coral cover and diversity found in the NMC, which can be explained by current patterns (such as the inflow of the SEC transporting larvae) combined with the high connectivity caused by mixing in the NMC eddies, and lower environmental stress than north of the NMC (McClanahan et al. 2014;Obura 2012).”
  • The same pattern was suggested for A. tenuis and is supported by the strong resemblance in coral species diversity between these sites.

    “This pattern was also suggested for A. tenuis (van der Ven et al. 2016) and is supported by the strong resemblance in coral species diversity between these sites (Obura 2012).”
  • The Northern Mozambique Channel is considered a priority region for conservation and management because it has high coral cover and species richness, probably caused by historical high connectivity and low or geographically variable environmental stress.

    “The NMC is considered a priority region for conservation and management efforts, as this region is high in coral cover and species richness, probably caused by historical high connectivity and low or geographically variable levels of environmental stress (McClanahan et al. 2007a(McClanahan et al. , 2014;;Obura 2012).”

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Research works printed but not linked: 5

  1. [5]Rosen BR (1971) The distribution of reef coral genera in the Indian Ocean. In: Stoddart DR, Yonge CM (eds) Regional Variation in Indian Ocean. Coral Reefs Symp Zool Soc London no 28 Academic Press pp 263–299.
  2. [47]Lieske E, Myers R (1996) Coral reef fishes of the Indo-Pacific and Caribbean. 2nd edition Collins ISBN0 00 219974 2.
  3. [49]Mortimer JA, Day M, Broderick D (2002) Sea turtle populations of the Chagos Archipelago, British Indian Ocean Territory. In: Proceedings of the Twentieth Annual Symposium on Sea Turtle Biology and Conservation. Mosier A, Foley A, Brost B (compilers) NOAA Technical Memorandum NMFS SEFSC-477: 47–49.
  4. [86]Wells JW (1956) Scleractinia. In: Moore RC (ed) Treatise on Invertebrate Paleontology. Geological Society of America and Univ. Kansas Press. F:328–440.
  5. [93]Colwell R, Coddington J (1994) Estimating species richness. Phil Trans Royal Soc of London (B) 345: 101– 118. 7972351

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Authors
Obura, D.
Affiliations
Coastal Oceans Research and Development in the Indian Ocean (KE)
Corresponding author
Obura, David
Venue
PLoS ONE
Published
2012-09-19
Volume
7
Issue
9
Pages
e45013
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1996588356
Cited by
228
References
76
Citations by year
2026: 11 · 2025: 12 · 2024: 24 · 2023: 17 · 2022: 16 · 2021: 18 · 2020: 19 · 2019: 18 · 2018: 23 · 2017: 15 · 2016: 19 · 2015: 20 · 2014: 9 · 2013: 6 · 2012: 1
FWCI
10.17
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Greater South Information System
Funders
  • National Geographic Society
  • Western Indian Ocean Marine Science Association
Topics
  • Physical Sciences › Environmental Science › Ecology › Coral and Marine Ecosystems Studies
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Biology and Ecology Research
  • Physical Sciences › Environmental Science › Global and Planetary Change › Marine Ecology and Invasive Species
Keywords
reef-building corals, scleractinian corals, coral species diversity, biogeography, Western Indian Ocean, Mozambique Channel, Chagos Archipelago, oceanographic drivers, South Equatorial Current
MeSH terms
Animals, Data Collection, Species Specificity, Water Movements, Cluster Analysis, Indian Ocean, Anthozoa, Biodiversity, Coral Reefs, Phylogeography

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