Great Lakes Cladophora in the 21st century: same algae-different ecosystem
Great Lakes Cladophora in the 21st century: same algae-different ecosystem
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DOI：
10.1016/j.jglr.2010.03.001
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发表时间：
2010-06-01
影响因子：
2.2
通讯作者：
Bootsma, Harvey A.
中科院分区：
文献类型：
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作者：
Auer, Martin T.;Tomlinson, Lisa M.;Bootsma, Harvey A.
营养生长的附加，绿色刚毛藻被认为已减弱磷管理计划根据五大湖水质协议。在伊利湖，密歇根州和安大略的滋扰增长的明显复苏已被连接到概念上的生态系统改造工程的入侵dreissenid贻贝（Dreissena polymorpha和Dreissena bugensis）。在这里，我们应用当代建模工具和历史水质数据集在量化的长期变化的影响，磷负荷和dreissenid介导的水透明度的变化刚毛藻的分布和生产。得出的结论是，德雷森期前磷负荷的减少达到了预期的效果，因为模型模拟与20世纪70年代初至80年代初报道的生物量下降一致。然而，这些下降在很大程度上被dreissenid驱动的水透明度变化所抵消，这种变化延长了刚毛藻的殖民深度，增加了总产量。我们不能隔离和量化的意义，利用历史数据库中的磷循环dreissenid调解。磷管理仍然是适当的机制，减少刚毛藻生长的滋扰水平。制定行动计划将需要更好地了解近岸磷动态，如可能通过定期监测可溶性活性磷水平，内部磷含量和刚毛藻生物量在受影响的五大湖近岸地区。(C)2010 Elsevier B.V.保留所有权利。
Nuisance growth of the attached, green alga Cladophora was considered to have been abated by phosphorus management programs mandated under the Great Lakes Water Quality Agreement. The apparent resurgence of nuisance growth in Lakes Erie, Michigan and Ontario has been linked conceptually to ecosystem alterations engineered by invasive dreissenid mussels (Dreissena polymorpha and Dreissena bugensis). Here, we apply contemporary modeling tools and historical water quality data sets in quantifying the impact of long-term changes in phosphorus loading and dreissenid-mediated changes in water clarity on the distribution and production of Cladophora. It is concluded that reductions in phosphorus loading in the pre-dreissenid period achieved the desired effect, as model simulations were consistent with the biomass declines reported from the early 1970s to the early 1980s. These declines were, however, largely offset by dreissenid-driven changes in water clarity that extended the depth of colonization by Cladophora, increasing total production. We were not able to isolate and quantify the significance of dreissenid mediation of phosphorus cycling using the historical database. Phosphorus management remains the appropriate mechanism for reducing nuisance levels of Cladophora growth. The development of action plans will require an improved understanding of nearshore phosphorus dynamics such as might be obtained through regular monitoring of soluble reactive phosphorus levels, internal phosphorus content and Cladophora biomass in impacted nearshore regions of the Great Lakes. (C) 2010 Elsevier B.V. All rights reserved.