Coral recruitment and early benthic community development on several materials used in the construction of artificial reefs and breakwaters

John Burt, Aaron Bartholomew, Andrew Bauman, Abdulla Saif, Peter F. Sale

    Research output: Contribution to journalArticle

    Abstract

    Artificial reefs are increasingly being promoted as a means to mitigate impacts from human activities in coastal urban areas. Coastal defense structures such as breakwaters are becoming recognized as large-scale artificial reefs that support abundant and diverse marine communities and play important roles in coastal ecology and management. However, there is limited understanding of how substrate materials used to construct artificial reefs or breakwaters can influence the development of habitat-forming benthic organisms. To assess the influence of substrata on coral recruitment and overall benthic community development, we deployed standard-size tiles of materials used in the construction of breakwaters and artificial reefs (concrete, gabbro, granite, and sandstone), along with terra-cotta for comparative purposes, at two breakwaters (DDD, PRT) and two natural reef sites (NR1, NR2) in Dubai, United Arab Emirates, for one year. Kruskal-Wallis ANOVA with post-hoc Mann-Whitney U-tests were used to examine differences in coral recruitment among sites and materials. Coral recruitment was highest at the DDD (4.9 ± 0.5 recruits 100 cm- 2), while recruitment was low and did not differ among other sites (PRT: 0.1 ± 0.04, NR1:0.3 ± 0.1, NR2: 0.1 ± 0.03 recruits 100 cm- 2). There were significant differences in coral recruitment among materials at DDD, where gabbro had higher recruit densities than concrete and sandstone; sandstone also contained less coral recruits than terra-cotta. Variability associated with low coral recruit densities precluded significant differences among materials at other sites. Overall benthic community structure differed more as a result of differences among sites than among substrate materials. Higher community dissimilarity was observed among sites than among material in SIMPER analysis, and significant differences were only observed among sites in ANOSIM. Univariate comparison of the benthos correlated with community differences in NMS ordination also showed significant differences among sites but not material. Overall, these results indicate that site-specific differences in recruitment patterns are more important in determining early benthic community structure and coral recruitment than are differences among substrate material. However, where coral recruitment is high, these results suggest that gabbro should be used preferentially over concrete or sandstone where it is feasible, but that granite may be a suitable alternative where it is the dominant stone. Coral recruitment on terra-cotta was comparable to all materials but sandstone, supporting its continued use in recruitment studies. These results also indicate that using stone amenable to coral recruitment is unlikely to influence the wider benthic community.

    Original languageEnglish (US)
    Pages (from-to)72-78
    Number of pages7
    JournalJournal of Experimental Marine Biology and Ecology
    Volume373
    Issue number1
    DOIs
    StatePublished - May 15 2009

    Fingerprint

    artificial reefs
    artificial reef
    community development
    breakwater
    benthos
    corals
    coral
    sandstone
    DDD
    gabbro
    United Arab Emirates
    granite
    benthic organisms
    substrate
    community structure
    material
    coastal protection
    tiles
    ordination
    urban areas

    Keywords

    • Artificial reef
    • Breakwater
    • Coral
    • Material
    • Recruitment
    • Terra-cotta
    • Tile

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics
    • Aquatic Science

    Cite this

    Coral recruitment and early benthic community development on several materials used in the construction of artificial reefs and breakwaters. / Burt, John; Bartholomew, Aaron; Bauman, Andrew; Saif, Abdulla; Sale, Peter F.

    In: Journal of Experimental Marine Biology and Ecology, Vol. 373, No. 1, 15.05.2009, p. 72-78.

    Research output: Contribution to journalArticle

    Burt, John ; Bartholomew, Aaron ; Bauman, Andrew ; Saif, Abdulla ; Sale, Peter F. / Coral recruitment and early benthic community development on several materials used in the construction of artificial reefs and breakwaters. In: Journal of Experimental Marine Biology and Ecology. 2009 ; Vol. 373, No. 1. pp. 72-78.
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