The effects of eutrophication-related alterations to coral reef communities on agents and rates of bioerosion (Reunion Island, Indian Ocean)
The effects of eutrophication-related alterations to coral reef communities on agents and rates of bioerosion (Reunion Island, Indian Ocean)
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DOI：
10.1007/s00338-002-0259-0
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发表时间：
2002-12-01
期刊：
影响因子：
3.5
通讯作者：
Cuet, P
中科院分区：
文献类型：
--
作者：
Chazottes, V;Le Campion-Alsumard, T;Cuet, P
这项研究调查了生物侵蚀过程的变化与富营养化引起的珊瑚礁群落扰动的关系。留尼汪岛的La Saline边缘珊瑚礁受到邻近陆地的营养输入。在三个不同养分输入水平和底栖生物群落反应的地点，利用暴露了一年的实验底物，测量了食草动物、小钻孔虫和大钻孔虫的生物侵蚀。用参数统计方法分析了生物侵蚀与硬质基质表层藻类覆盖的关系，以及生物侵蚀各因素之间的相互作用。不同地点的生物侵蚀差异显著，放牧率为1.63~3.52 kg CaCO3m(-2)年(-1)，大钻孔率为6.73~32.25gm(-2)年，微钻孔率为43.78~67.56gm(-2)年(-1)。控制这些变化的主要因素之一似乎是由于珊瑚礁水化学变化而导致底质上的藻类盖度发生了变化。在死珊瑚主要以藻类草坪为主要栖息地的低营养地区，由于密集放牧(3.52 kg M年(-1))，微生物侵蚀量较低2年(43.78 g m(-2)年(-1))。在接受高养分输入的礁区，结壳的钙藻和大型藻类的发育与各地点记录的最低放牧率(1.63 kg m(-2)年(-1))和大钻孔率(6.73 g m(-2)年(-1))有关。相反，微钻孔率高(57.54和67.56g m(-2)a(-1))发现在富集区与高大型藻类盖度有关。
This study investigated the variation of bioerosional processes in relation to disturbances of reefal communities due to eutrophication. La Saline fringing reef (Reunion Island) is subjected to nutrient inputs from the adjacent land. Bioerosion by grazers, microborers, and macroborers was measured using experimental substrata exposed for I year in three sites characterized by different levels of nutrient input and benthic community response. The relationship between bioerosion and epilithic algal cover of hard substrata and the interactions between the various agents of bioerosion were analyzed with parametric statistics. Significant variations in bioerosion were found among sites, ranging from 1.63 to 3.52 kg CaCO3 m(-2) year(-1) for grazing rates, from 6.73 to 32.25 g m(-2) year(-1) for macroboring rates, and from 43.78 to 67.56 g m(-2) year(-1) for microboring rates. One of the major factors controlling these variations appeared to be changes in the epilithic algal cover on substrata in response to changes in reefal water chemistry. In low nutrient areas, where dead corals were colonized mainly by algal turfs, erosion by microorganisms was low 2 (43.78 g m(-2) year(-1)) due to intense grazing (3.52 kg M year(-1)). In reef zones receiving high nutrient inputs, the development of encrusting calcareous algae and macroalgae was associated with the lowest grazing (1.63 kg m(-2) year(-1)) and macroboring (6.73 g m(-2) year(-1)) rates recorded among sites. in contrast, high microboring rates (57.54 and 67.56 g m(-2) year(-1)) were found in enriched areas in association with high macroalgal cover.