Insights into community-based bioassessment of environmental quality status using microphytobenthos in estuarine intertidal ecosystems
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摘要: 本研究旨在利用河口潮间带底栖微藻基于群落水平评价环境质量状态。底栖微藻底质样品每月一次于2006年9月到2007年8月间采自韩国洛东江河口的四个站点,同时测定盐度、日照强度、底质颗粒粒度、营养盐(硅酸盐、硝酸盐、亚硝酸盐、铵盐、磷酸盐)等环境因子。统计分析环境因子与生物因子的相关关系,结果表明:(1)四个站点的底栖微藻群落结构显著不同;(2)底栖微藻群落的空间变动与环境因子、尤其是铵盐及盐度和颗粒粒度显著相关;(3)三个种(Navicula lacustris, Pleurosigma anglulatum和Fragilaria sp.1) 与营养盐和/或硅酸盐显著相关;(4)种丰富度和多样性与颗粒粒度显著相关。研究表明,底栖微藻群落可作为生物指示剂用于评价河口潮间带生态系统的环境质量状态。Abstract: The feasibility of community-based bioassessment of environmental quality status was studied using microphytobenthos (MPB) in estuarine intertidal ecosystems. The sediment samples of MPB were collected monthly during a 1-year cycle (September 2006-August 2007) at four sampling stations in the Nakdong River Estuary, Korea. Environmental variables, such as salinity, radiation, grain size of sediment, Si(OH)4 (Si), nitrate (NO3-), nitrite (NO2-), ammonium (NH4+) and phosphates (PO43-), were measured synchronously for comparison with biotic parameters. The statistical analyses were carried out for assessment the relationship between biotic and environmental parameters. The results showed that: (1) the MPB community structures were significant differences among four sampling stations; (2) spatial variation in the MPB communities were significantly correlated with environmental variables, especially the nutrient NH4+ in combination with salinity and grain size; (3) three species (Navicula lacustris, Pleurosigma anglulatum and Fragilaria sp. 1) were significantly correlated with nutrients and/or Si; and (4) the species richness and diversity were significantly correlated with the grain size. It is suggested that MPB communities may be used as a potentially robust bioindicator for assessing environmental quality status in estuarine intertidal ecosystems.
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