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Allelopathic effects on the sun-coral invasion: facilitation, inhibition and patterns of local biodiversity

机译：化感作用对太阳珊瑚的入侵：促进，抑制当地生物多样性的方式

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In spite of growing concerns about the invasion of the sun-coral Tubastraea coccinea along the tropical Southwestern Atlantic, the biological interactions mediating this species' establishment and spread are largely unknown. Here, we identified species associations with T. coccinea by comparing community structure between invaded and noninvaded areas at Bazios Island, SP, Brazil. We also investigated effects of chemical cues from representative benthic species on sun-coral larval performance in the laboratory and quantified the density of sun-coral recruits across different microhabitats in the field. Field surveys showed that the invasion of the sun-coral is more intense at reef areas of higher species richness and diversity, putting at risk a higher number of native species than anticipated and suggesting that local richness offers little resistance to invasion. Highest density of T. coccinea recruits observed on the least bioactive encrusting corallines suggests this taxonomic group may constitute doorways to the establishment of this coral. In contrast, field patterns of sun-coral colonies and recruits, as well as laboratory trials, suggest that cnidarian-dominated habitats represent obstacles to the sun-coral invasion. Thus, while areas dominated by the snowflake coral Carijoa riisei-which showed the greatest negative allelopathic effect on T. coccinea-likely provide resistance to the invader spreading, areas covered by encrusting coralline algae and 'barren substrates' probably facilitate its establishment. Because these latter, less-structured microhabitats often prevail after disturbance, damage assessment following human-mediated impacts should include detection and control of sun-coral populations.
机译：尽管越来越多的人担心太阳珊瑚Tubastraea coccinea沿着热带西南大西洋的入侵，但介导该物种的建立和传播的生物相互作用却鲜为人知。在这里，我们通过比较巴西SP巴齐亚斯岛的受侵袭区域和非受侵袭区域之间的群落结构，确定了与T. coccinea的物种关联。我们还在实验室中研究了来自具有代表性的底栖物种的化学线索对太阳珊瑚幼虫性能的影响，并量化了该领域不同微生境中太阳珊瑚新兵的密度。实地调查表明，在物种丰富度和多样性更高的珊瑚礁地区，太阳珊瑚的入侵更为强烈，这使更多的本地物种处于危险之中，这比预期的要多，这表明当地的丰富性对入侵的抵抗力很小。在生物活性最弱的珊瑚线上观察到的T. coccinea新兵密度最高，表明该分类学类别可能构成了该珊瑚建立的门户。相比之下，太阳珊瑚殖民地和新兵的野外模式以及实验室试验表明，以CNIDIAN为主的栖息地是太阳珊瑚入侵的障碍。因此，虽然以雪花珊瑚Carijoa riisei为主的区域（对T.coccinea表现出最大的负面化感作用）可能提供了对入侵者扩散的抵抗力，但覆盖着珊瑚藻类和“贫瘠基质”的区域可能有助于其建立。由于这些结构较差的微栖息地通常在干扰后普遍存在，因此，在人为影响之后的损害评估应包括对太阳珊瑚种群的检测和控制。

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  • 来源
    《Marine biology》 |2017年第6期|139.1-139.15|共15页
  • 作者

    Mizrahi Damian; Pereira Suelen F.; Navarrete Sergio A.; Flores Augusto A. V.;

  • 作者单位

    Univ Sao Paulo, Ctr Biol Marinha CEBIMar USP, Rod Manoel Hipolito Rego,Km 131-5, BR-11600000 Sao Sebastiao, SP, Brazil;

    Univ Sao Paulo, Inst Biociencias IB USP, Rua Matao,Travessa 14,321,Cidade Univ, BR-05508090 Sao Paulo, SP, Brazil;

    Pontificia Univ Catolica Chile, Estn Costera Invest Marinas, Ctr Marine Conservat, LincGlobal, Casilla 114-D, Santiago, Chile|Pontificia Univ Catolica Chile, Ctr Appl Ecol & Sustainabil CAPES, Dept Ecol, Casilla 114-D, Santiago, Chile;

    Univ Sao Paulo, Ctr Biol Marinha CEBIMar USP, Rod Manoel Hipolito Rego,Km 131-5, BR-11600000 Sao Sebastiao, SP, Brazil;

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