Water quality as a regional driver of coral biodiversity and macroalgae on the Great Barrier Reef
Water quality as a regional driver of coral biodiversity and macroalgae on the Great Barrier Reef
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DOI：
10.1890/08-2023.1
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发表时间：
2010-04-01
影响因子：
5
通讯作者：
Fabricius, Katharina
中科院分区：
文献类型：
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作者：
De'ath, Glenn;Fabricius, Katharina
由于水质差而导致的近海珊瑚礁退化是一个主要问题，但事实证明，很难在地方以外的尺度上证明这种联系。本研究模拟了澳大利亚大堡礁（GBR; 12-24°S）大尺度水体清晰度和叶绿素数据与四种珊瑚礁状态测量之间的关系。从水质和空间位置上预测了具有不同营养需求的4个生物类群，即大型藻类覆盖、硬珊瑚、光养和异养八爪珊瑚的分类丰富度。水体净度和叶绿素呈强烈的空间格局，水体净度从近岸向近岸增加3倍以上，叶绿素从近岸向近岸减少约2倍，从南向北减少约2倍。随着浊度和叶绿素的增加，硬珊瑚和光养型八桅珊瑚的丰富度下降，而大型藻类和异养型八桅珊瑚的丰富度增加。大藻覆盖对水质的影响最大，随着水体清晰度的降低增加5倍，随着叶绿素的增加增加1.4倍。四种生物群中，每种生物群45%的变异是可预测的，其中水质效应占18-46%，其余为空间效应。这些效应与生物群的营养需求一致，表明大藻覆盖和珊瑚生物多样性都部分受到能量供应限制的控制。在整个GBR中，年平均值为100 - 10米塞奇盘深度（水的清澈度的量度）和
Degradation of inshore coral reefs due to poor water quality is a major issue, yet it has proved difficult to demonstrate this linkage at other than local scales. This study modeled the relationships between large-scale data on water clarity and chlorophyll and four measures of reef status along the whole Great Barrier Reef, Australia (GBR; 12-24 degrees S). Four biotic groups with different trophic requirements, namely, the cover of macroalgae and the taxonomic richness of hard corals and phototrophic and heterotrophic octocorals, were predicted from water quality and spatial location. Water clarity and chlorophyll showed strong spatial patterns, with water clarity increasing more than threefold from inshore to offshore waters and chlorophyll decreasing approximately twofold from inshore to offshore and approximately twofold from south to north. Richness of hard corals and phototrophic octocorals declined with increasing turbidity and chlorophyll, whereas macroalgae and the richness of heterotrophic octocorals increased. Macroalgal cover experienced the largest water quality effects, increasing fivefold with decreasing water clarity and 1.4-fold with increasing chlorophyll. For each of the four biota, 45% of variation was predictable, with water quality effects accounting for 18-46% of that variation and spatial effects accounting for the remainder. Effects were consistent with the trophic requirements of the biota, suggesting that both macroalgal cover and coral biodiversity are partially controlled by energy supply limitation. Throughout the GBR, mean annual values of >10 m Secchi disk depth (a measure of water clarity) and