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首页> 外文期刊>Ecosystems >Bottom-Up Factors for Algal Productivity Outweigh No-Fishing Marine Protected Area Effects in a Marginal Coral Reef System
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Bottom-Up Factors for Algal Productivity Outweigh No-Fishing Marine Protected Area Effects in a Marginal Coral Reef System

机译：在边缘珊瑚礁系统中，藻类生产力的自下而上因素超过了不捕捞的海洋保护区效应

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Herbivory, together with seasonal variations in temperature, light and nutrient concentration regulate macroalgal populations on coral reefs. Individual management interventions can influence this balance by altering some, but not all of these potential drivers. For example, no-take marine protected areas (MPAs) on coral reefs can increase herbivorous fish abundance, thereby decreasing macroalgal coverage, but have limited influence on water quality and other vagile drivers. We compared the relative influence of seven abiotic water quality variables to that of MPA status on macroalgal coverage in 14 sites (5 of which are within no-take MPAs) over four consecutive seasons (summer through to spring) within the marginal coral reef habitats of Moreton Bay, Australia. Algal cover was quantified by taking 100 photo quadrats per site per sampling with the relative importance of our eight factors determined statistically by generalised additive models. Overall, temporal variations in total macroalgal cover and four out of five important macroalgal genera correlated with factors other than marine protection, especially water temperature, salinity, water clarity (Secchi disc) and nutrient concentration (nitrogen and phosphorus). However, seasonal variations in cover of individual macroalgal genera did not follow strong temporal trends and were not consistent with total macroalgal cover, meaning that different factors were significant for different algal genera. Consequently, we advocate for caution in determining the influence of impact gradients by exclusively measuring total macroalgal cover. This study highlights the importance of considering local impact gradients and habitat recovery processes in the design of protected area networks.
机译：食草动物，以及温度，光照和养分浓度的季节性变化共同调节了珊瑚礁上的大型藻类种群。个体管理干预可以通过更改部分（但不是全部）潜在驱动因素来影响这种平衡。例如，珊瑚礁上的非捕捞性海洋保护区（MPA）可以增加草食性鱼的丰度，从而减少大型藻类的覆盖范围，但对水质和其他易变的驱动因素的影响有限。我们比较了七个非生物水质变量与MPA状况相对于四个边缘季节（夏季至春季）在14个地点（夏季至春季）对大型藻类覆盖率的相对影响（其中5个处于禁食MPA范围内）。澳大利亚摩顿湾。每次采样每个地点拍摄100张照片四边形，以量化我们的藻类覆盖度，其中八项因素的相对重要性由广义加性模型统计确定。总体而言，总的藻类覆盖度的时间变化和五个重要的藻类属中的四个与海洋保护以外的其他因素相关，尤其是水温，盐度，水净度（Secchi圆片）和养分浓度（氮和磷）。然而，单个大型藻属的覆盖率的季节性变化没有遵循强烈的时间趋势，并且与总大型藻类覆盖率不一致，这意味着不同的因素对于不同的藻属具有重要意义。因此，我们提倡谨慎通过完全测量总的藻类覆盖物来确定影响梯度的影响。这项研究强调了在设计保护区网络时考虑当地影响梯度和栖息地恢复过程的重要性。

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