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Temporal variation in macroalgal removal: insights from an impacted equatorial coral reef system
Marine Biology ( IF 2.4 ) Pub Date : 2021-01-01 , DOI: 10.1007/s00227-020-03806-7
Jovena C. L. Seah , Andrew G. Bauman , Peter A. Todd

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 $$\sim $$ ∼ 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.

中文翻译:

大型藻类清除的时间变化:来自受影响的赤道珊瑚礁系统的见解

大型藻类去除是一项关键的生态系统功能,但很少有研究考虑其时间变化,尤其是在草食性鱼类生物多样性有限的受影响珊瑚礁上。为了解决这个问题,我们在 2016 年 7 月至 2017 年 6 月期间每月使用一系列移植的马尾藻分析和水下摄像机对新加坡三个退化珊瑚礁的大型藻类去除和质量标准化的食草鱼类的咬伤率进行量化:Pulau Satumu、Kusu 岛、和 Terumbu Pempang Tengah。我们的研究结果显示,所有地点的大型藻类食草动物(去除的生物量比例和质量标准化咬伤率)率存在明显的时间模式,从 7 月开始增加,从 1 月开始下降,12 月记录的最高比率(28.10 ± 3.05 g 3.5 h - 1 ; 208.24 ± 29.99 质量标准化咬 3. 5 h -1 )和最低的 5 月(0.86 ± 0.17 g 3.5 h -1 ;9.55 ± 3.19 质量标准化咬合 3.5 h -1 )。这些与 S. ilicifolium 生长周期相吻合,证实了先前的证据,即食草率与大型藻类状况密切相关。视频分析显示,一年中有 9 个物种进食(31,839 次叮咬;8702.89 次质量标准化叮咬),Siganus virgatus 占总质量标准化叮咬的 80%。Siganus virgatus 每月咬伤的比例最大,除了 4 月和 6 月之间,当时 Scarus rivulatus 占主导地位,这表明功能作用受到时间限制。证实了先前的证据,即食草率与大型藻类状况密切相关。视频分析显示,一年中有 9 个物种进食(31,839 次叮咬;8702.89 次质量标准化叮咬),Siganus virgatus 占总质量标准化叮咬的 80%。Siganus virgatus 每月咬伤的比例最大,除了 4 月和 6 月之间,当时 Scarus rivulatus 占主导地位,这表明功能作用受到时间限制。证实了先前的证据,即食草率与大型藻类状况密切相关。视频分析显示,一年中有 9 个物种进食(31,839 次叮咬;8702.89 次质量标准化叮咬),Siganus virgatus 占总质量标准化叮咬的 80%。Siganus virgatus 每月咬伤的比例最大,除了 4 月和 6 月之间,当时 Scarus rivulatus 占主导地位,这表明功能作用受到时间限制。
更新日期:2021-01-01
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