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Temporal variation in macroalgal removal: insights from an impacted equatorial coral reef system

机译:Macroalgal清除的时间变化:受冲击赤道珊瑚礁系统的见解

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摘要

Macroalgal removal is a critical ecosystem function yet few studies have considered its temporal variability, especially on impacted reefs with limited herbivorous fish biodiversity. To address this, we quantified macroalgal removal and mass-standardised bite rates of herbivorous fishes monthly from July 2016 to June 2017 using a series of transplanted Sargassum ilicifolium assays and underwater video cameras on three degraded coral reefs in Singapore: Pulau Satumu, Kusu Island, and Terumbu Pempang Tengah. Our results revealed a distinct temporal pattern in macroalgal herbivory (proportion of biomass removed and mass-standardised bite rates) rates across all sites, increasing from July and decreasing from January, with the highest rates recorded in December (28.10 +/- 3.05 g 3.5 h(-1); 208.24 +/- 29.99 mass-standardised bites 3.5 h(-1)) and the lowest in May (0.86 +/- 0.17 g 3.5 h(-1); 9.55 +/- 3.19 mass-standardised bites 3.5 h(-1)). These coincided with the S. ilicifolium growth cycle, confirming previous evidence that herbivory rates are closely linked to macroalgal condition. Video analyses revealed nine species feeding over a year (31,839 bites; 8702.89 mass-standardised bites), with Siganus virgatus responsible for similar to 80% of the total mass-standardised bites. Siganus virgatus took the largest proportion of bites monthly, except between April and June, when Scarus rivulatus was dominant, suggesting temporal constraints in functional roles.
机译:Macroalgal去除是一个关键的生态系统功能,但很少有研究已经考虑了其时间变异性,特别是在具有有限的食子生物多样性有限的受影响的珊瑚礁上。为了解决这一点,我们在2016年7月到2017年7月,我们在2017年7月到2017年6月在新加坡的三个退化珊瑚礁上量化了2017年6月的Matroalgal Removal和Math-Stardized的肉食百分点,并在新加坡的三个退化珊瑚礁上:Pulau Satumu,Kusu Island,和Terumbu Pempang Tengah。我们的结果揭示了在所有地点的大型草药(消除的生物质比例和大规模标准化的咬合率)的不同时间模式,从7月份和1月份的减少增加,12月份录制的最高率(28.10 +/- 3.05 g 3.5 H(-1); 208.24 +/- 29.99质量标准化咬伤3.5小时(-1)),5月份最低(0.86 +/- 0.17g 3.5小时(-1); 9.55 +/- 3.19质量标准化咬3.5 H(-1))。这些与S.IliciFiFolium生长循环吻合,确认以前的证据表明草本速率与大甲术病症密切相关。视频分析显示九种物种喂养超过一年(31,839磅; 8702.89质量标准化的叮咬),SIGANUSVIRGATUS负责占总质量标准化叮咬的80%。 SIGANUSVIRGATUS在4月和6月之间采取了最大的叮咬比例,除了疤痕RIVULATUS占主导地位,表明功能角色的时间限制。

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  • 来源
    《Marine biology》 |2021年第1期|2.1-2.12|共12页
  • 作者单位

    Natl Univ Singapore Dept Biol Sci Expt Marine Ecol Lab 14 Sci Dr 4 Singapore 117558 Singapore;

    Natl Univ Singapore Dept Biol Sci Expt Marine Ecol Lab 14 Sci Dr 4 Singapore 117558 Singapore;

    Natl Univ Singapore Dept Biol Sci Expt Marine Ecol Lab 14 Sci Dr 4 Singapore 117558 Singapore;

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