Periphyton as an indicator of restoration in the Florida Everglades
Periphyton as an indicator of restoration in the Florida Everglades
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DOI：
10.1016/j.ecolind.2008.08.004
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发表时间：
2009-11-01
影响因子：
6.9
通讯作者：
Gaiser, Evelyn
中科院分区：
文献类型：
--
作者：
Gaiser, Evelyn
附生植物群落在佛罗里达大沼泽湿地的大部分初级生产力中占主导地位，因此对土壤生产力、生态系统新陈代谢和次级生产力以及依赖的群落的组成都有贡献。数十年来对沼泽地的研究支持了其他湿地类型的研究结果，这些研究结果累积表明，附生植物群落对湿地结构和功能的两个主要驱动因素--水文和水质--的变化反应非常迅速。水文学通过调节水分供应、可用于定居的底物类型和营养物质的供应来控制附生植物的生产力和组成。养分，特别是这个系统中的限制性养分，磷(P)，控制着产量和群落组成的水平。由于围生植物群落与水文和水质密切相关，因此基于围生植物的三个属性：丰度、质量(即营养成分)和群落组成，开发了一个指示器。这一评估工具在适合积极管理的时间尺度上对生态系统对管理活动中潜在变化的反应进行了定性评估。举例说明如何利用该指标从高密度空间调查中评估当前的水质和水文条件。检测到的恶化模式与模型预测、已知营养物来源和非自然水文状况得出的预期一致。如果在生态系统管理中适应性地使用，这个工具既可以用来检测变化，也可以在系统被不可挽回地改变之前做出反应。(C)2008爱思唯尔有限公司。保留所有权利。
Periphyton communities dominate primary production in much of the Florida Everglades wetland and therefore contribute to soil production, ecosystem metabolism and secondary production as well as the composition of dependent communities. Decades of research in the Everglades have supported research findings from other wetland types that cumulatively show that periphyton communities respond very rapidly to alterations in the two dominant drivers of wetland structure and function-hydrology and water quality. Hydrology controls periphyton productivity and composition by regulating moisture availability, substrate types available for colonization and supply of nutrients. Nutrients, particularly the limiting nutrient in this system, phosphor-us (P), control levels of production and community composition. Because periphyton communities arc well-established to be related to hydrology and water quality, an indicator was developed based on three periphyton attributes: abundance, quality (i.e., nutrient content) and community composition. This assessment tool offers a qualitative assessment of ecosystem response to potential changes in management activities at a time scale appropriate for active management. An example is provided of how the indicator can be used to assess the current water quality and hydrological conditions from high-density spatial surveys. Detected patterns of deterioration align with expectations derived from model predictions and known sources of nutrients and unnatural hydrologic regimes. If employed adaptively, in ecosystem management, this tool can be used to both detect and react to change before the system has been irreparably altered. (C) 2008 Elsevier Ltd. All rights reserved.