竞争在珊瑚礁上拟多变异群海葵（Palythoa cf. variabilis）向优势地位转变阶段中的作用。
The role of competition in the phase shift to dominance of the zoanthid Palythoa cf. variabilis on coral reefs.
作者信息
Cruz Igor Cristino Silva, Meira Verena Henschen, de Kikuchi Ruy Kenji Papa, Creed Joel Christopher
机构信息
Programa de Pós Graduação em Ecologia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier 524, ZIP 20559-900, Rio de Janeiro, RJ, Brazil; Laboratório de Manejo, Ecologia e Conservação Marinha, Instituto Oceanográfico, Universidade de São Paulo, Praça do Oceanográfico, 191, Cidade Universitária, ZIP 05508-120, São Paulo, SP, Brazil; Laboratório Recifes de Corais e Mudanças Globais, Instituto de Geociências, Universidade Federal da Bahia, Rua Barão de Geremoabo, s/n Ondina, ZIP 40170-115, Salvador, BA, Brazil; Laboratório de Ecologia Marinha Bêntica, Departamento de Ecologia, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro - UERJ, PHLC Sala 220, Rua São Francisco Xavier 524, ZIP 20559-900, Rio de Janeiro, RJ, Brazil.
Laboratório Recifes de Corais e Mudanças Globais, Instituto de Geociências, Universidade Federal da Bahia, Rua Barão de Geremoabo, s/n Ondina, ZIP 40170-115, Salvador, BA, Brazil.
出版信息
Mar Environ Res. 2016 Apr;115:28-35. doi: 10.1016/j.marenvres.2016.01.008. Epub 2016 Jan 28.
Phase shift phenomena are becoming increasingly common. However, they are also opportunities to better understand how communities are structured. In Southwest Atlantic coral reefs, a shift to the zoanthid Palythoa cf. variabilis dominance has been described. To test if competition drove this process, we carried out a manipulative experiment with three coral species. To estimate the natural frequency of encounters we assess the relationship between the proportion of encounters and this zoanthids coverage. The contact causes necrosis in 78% of coral colonies (6.47 ± SD 7.92 cm(2)) in 118 days. We found a logarithmic relationship between the proportion of these encounters and the cover of P. cf. variabilis, where 5.5% coverage of this zoanthid is enough to put 50% of coral colonies in contact, increasing their partial mortality. We demonstrate that zoanthid coverage increase followed by coral mortality increase will reduce coral cover and that competition drives the phase shift process.
相移现象正变得越来越普遍。然而，它们也是更好地理解群落结构方式的契机。在西南大西洋珊瑚礁中，已描述了向类多变管海葵（Palythoa cf. variabilis）占主导地位的转变。为了测试竞争是否推动了这一过程，我们对三种珊瑚物种进行了控制实验。为了估计自然接触频率，我们评估了接触比例与这种管海葵覆盖率之间的关系。在118天内，这种接触导致78%的珊瑚群体（6.47±标准差7.92平方厘米）出现坏死。我们发现这些接触的比例与类多变管海葵的覆盖率之间存在对数关系，即这种管海葵5.5%的覆盖率就足以使50%的珊瑚群体发生接触，从而增加它们的局部死亡率。我们证明，管海葵覆盖率增加随后珊瑚死亡率上升会降低珊瑚覆盖率，并且竞争推动了相移过程。
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