Macroalgal community response to re-oligotrophication in Saronikos Gulf
Macroalgal community response to re-oligotrophication in Saronikos Gulf
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DOI：
10.3354/meps10060
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发表时间：
2013-01
影响因子：
2.5
通讯作者：
K. Tsiamis;P. Panayotidis;M. Salomidi;A. Pavlidou;Julia Kleinteich;Katerina Balanika;F. Küpper
中科院分区：
文献类型：
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作者：
K. Tsiamis;P. Panayotidis;M. Salomidi;A. Pavlidou;Julia Kleinteich;Katerina Balanika;F. Küpper
由于20世纪50年代以来雅典-比雷埃夫斯大都市区的快速城市化，爱琴海（希腊，东地中海）的一个海湾萨罗尼科斯湾经历了深刻而前所未有的环境变化。从1950年代中期到1990年代中期，萨罗尼科斯湾的内部受到未经处理的城市污水越来越多的输入。由此产生的长期富营养化反映在植物底栖生物中，表现为多样性低，主要是短命物种群落，主要是以嗜氮绿色藻类石莼属为主。和刚毛藻属（Cladophora spp.）20世纪90年代中期，一个污水处理厂开始在比雷埃夫斯港附近的Psittalia岛上运行，收集了雅典整个中央污水排放口。自1998年以来，对萨罗尼克湾沿岸生态系统进行了定期监测，以评估大型底栖藻类群落和营养水平的年内和年际变化。不久，营养物和有机物负荷急剧下降，导致海湾迅速重新贫营养化。在这一新的制度转变，大型藻类群落的生物多样性普遍增加和显着减少的丰富的嗜氮绿色藻类。然而，在过去的几年里，该地区的冠层褐藻（Cystoseira和Sargassum）出人意料地显示出急剧的种群下降。尽管这种现象可能仍在持续，因此没有得到充分的描述和理解，这项研究是第一个提供一个长期的数据集的大型藻类反应的快速再富营养化过程发生在一个高度城市化的地中海沿岸地区。
The Saronikos Gulf, an embayment of the Aegean Sea (Greece, Eastern Mediterran- ean), has undergone profound and unprecedented environmental changes due to the rapid urban- ization of the Athens-Piraeus metropolitan area since the 1950s. From the mid-1950s until the mid- 1990s, the inner part of Saronikos Gulf was subject to increasing inputs of untreated urban sewage. The resulting long-lasting eutrophication was reflected in the phytobenthos by the pres- ence of low-diversity, mainly ephemeral species communities, largely dominated by the nitrophilous green algae Ulva spp. and Cladophora spp. In the mid-1990s, a wastewater treatment plant started operating on Psittalia islet near the port of Piraeus, capturing the entire central sewage outfall of Athens. Since 1998, the coastal ecosystem of Saronikos Gulf has been under reg- ular monitoring to assess intra-annual and interannual changes in benthic macroalgal communi- ties and nutrient levels. A sharp decline in nutrient and organic loads was soon recorded, leading to a rapid re-oligotrophication of the gulf. Upon this new regime shift, macroalgal communities responded by a general increase in biodiversity and a marked decrease in the abundance of nitrophilous green algae. Within the last years, however, the canopy brown algae (Cystoseira and Sargassum) in the area unexpectedly showed a sharp population decline. Even though this pheno - me non may be still ongoing and thus is not fully described and understood, this study is the first to provide a long-term data set of macroalgal responses to a rapid re-oligotrophication process taking place within a highly urbanized Mediterranean coastal area.