{"refrec":{"BRefID":107815,"RR":"<b>Baird, A.H.; Hughes, T.P.</b> (2000). Competitive dominance by tabular corals: an experimental analysis of recruitment and survival of understorey assemblages. <i>J. Exp. Mar. Biol. Ecol. 251(1)</i>: 117-132","BEntID":102612,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Exp. Mar. Biol. Ecol. 251(1)</i>: 117-132","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Baird, A.H.; Hughes, T.P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Baird, A.H.; Hughes, T.P.","Englishabstract":"Tabular and staghorn corals of the genus <i>Acropora</i> often form low-diversity stands on shallow coral reefs, presumably due to their rapid growth rate and ability to outcompete understorey assemblages. Coral cover underneath the abundant Indo-Pacific tabular coral, <i>Acropora hyacinthus</i>, was four times lower than on the adjacent substratum on the reef crest at Lizard Island on the northern Great Barrier Reef. We investigated the effect of <i>A. Hyacinthus</i> on patterns of recruitment and mortality by placing experimental panels and coral fragments underneath large colonies of <i>A. Hyacinthus</i>. After 8 weeks, recruitment of corals, filamentous algae and crustose coralline algae (CCA) underneath <i>A. Hyacinthus</i> was 96, 85 and 50% lower, respectively, compared to panels placed in the open. In contrast, recruitment by bivalves and polychaetes was uniform among treatments, while bryozoans recruited four times more abundantly under <i>A. Hyacinthus</i> than in the open. Consequently, the low rate of recruitment by corals beneath <i>A. Hyacinthus</i> does not appear to be due to a reduction in the delivery of larvae underneath tables. Instead, the disparity between phototrophic and heterotrophic taxa suggests that diminished light levels under <i>A. Hyacinthus</i> are partially responsible for the divergence in recruit assemblages. To test the effect of <i>A. Hyacinthus</i> on early mortality and growth of established organisms, recruitment panels were placed on the open for 9 weeks then transplanted underneath <i>A. Hyacinthus</i> for a further 8 weeks. The survivorship of juvenile corals underneath tables was less than half that of those on control panels on the unshaded reef crest. Furthermore, the abundance of algal turfs and CCA was sharply lower on transplanted panels. In contrast, heterotrophic organisms increased in cover, regardless of treatment. Experimental branch fragments of <i>Acropora intermedia</i> and <i>Pocillopora damicornis</i> also survived poorly following transplantation underneath <i>A. Hyacinthus</i>, compared to adjacent, unshaded controls. We conclude that <i>A. 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