The Florida experience: time for a revitalized and restructured Clean Lakes Program

IF 1.1 4区环境科学与生态学 Q4 LIMNOLOGY Lake and Reservoir Management Pub Date : 2023-07-03 DOI:10.1080/10402381.2023.2236588

D. Canfield, R. Bachmann, M. Hoyer

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Abstract

Abstract Canfield, DE Jr., Bachmann RW, Hoyer MV. 2023. The Florida experience: time for a revitalized and restructured Clean Lakes Program. Lake Reserv Manage. 39:191–212. Anthropogenic nonpoint source nutrient enrichment of lakes is a worldwide problem, but inputs from the watershed to Florida lakes may not be as severe as speculated. Long-term trends for total phosphorus (TP), total nitrogen (TN), chlorophyll (Chl), and Secchi disk transparency (SDT), enrichment surrogates, in 381 lakes monitored for 20–43 yr and having extensive management to none demonstrated improvements in trophic conditions following point source removals. Afterward, TP (R2 = 0.85), TN (R2 = 0.49), and Chl (R2 = 0.50) continued to decline significantly (P < 0.05) and SDT (R2 = 0.63) increased. For 99 state-designated “impaired” lakes, TP (R2 = 0.73), TN (R2 = 0.45), and Chl (R2 = 0.44) also declined and SDT (R2 = 0.69) increased. To consider natural background conditions, lakes were assigned to their ambient TP and TN zones. Geometric TP (93%) and TN (82%) zone averages for each lake after removal of point sources remained within each zone’s 95% confidence interval. Individual lake trend analyses documented that ∼80% showed no (most) or an improving trend for the trophic state variables. After correcting for “statistically meaningful” results or to remove false significances, <5% of the lakes had trophic state variable changes associated with eutrophication. If lakes are to be rehabilitated and/or protected to maintain designated uses, exclusive focus on watershed management of nonpoint source nutrients and associated regulatory actions should not be relied on to correct “impairments” in a timely manner. Management priorities should focus on actual causes of impairment and the most effective and efficient approaches for improvement.

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佛罗里达的经历:是时候重振和重组清洁湖泊计划了

摘要Canfield，DE Jr.，Bachmann RW，Hoyer MV.2023。佛罗里达州的经验：是时候振兴和重组清洁湖泊计划了。湖泊保护区管理。39:191-212。湖泊的人为非点源营养富集是一个世界性的问题，但从流域到佛罗里达湖泊的输入可能没有推测的那么严重。在监测了20–43年的381个湖泊中，总磷（TP）、总氮（TN）、叶绿素（Chl）和塞奇圆盘透明度（SDT）（富集替代物）的长期趋势 yr，并对其进行广泛管理，表明点源清除后营养条件有所改善。之后，TP（R2=0.85）、TN（R2=0.49）和Chl（R2=0.50）继续显著下降（P < 0.05）和SDT（R2=0.63）增加。对于99个国家指定的“受损”湖泊，TP（R2=0.73）、TN（R2=0.45）和Chl（R2=0.44）也有所下降，SDT（R2=0.69）有所增加。为了考虑自然背景条件，将湖泊划分为其周围的TP和TN区域。去除点源后，每个湖泊的几何TP（93%）和TN（82%）区域平均值保持在每个区域95%的置信区间内。单个湖泊趋势分析表明，~80%的湖泊营养状态变量没有（大多数）或有改善趋势。在校正“具有统计意义”的结果或消除虚假意义后，<5%的湖泊出现了与富营养化相关的营养状态变量变化。如果要修复和/或保护湖泊以保持指定用途，则不应依赖对非点源营养物质的流域管理和相关监管行动来及时纠正“损害”。管理优先事项应侧重于减值的实际原因以及最有效和高效的改进方法。

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来源期刊

Lake and Reservoir Management 环境科学-海洋与淡水生物学

自引率

6.70%

发文量

期刊介绍： Lake and Reservoir Management (LRM) publishes original, previously unpublished studies relevant to lake and reservoir management. Papers address the management of lakes and reservoirs, their watersheds and tributaries, along with the limnology and ecology needed for sound management of these systems. Case studies that advance the science of lake management or confirm important management concepts are appropriate as long as there is clearly described management significance. Papers on economic, social, regulatory and policy aspects of lake management are also welcome with appropriate supporting data and management implications. Literature syntheses and papers developing a conceptual foundation of lake and watershed ecology will be considered for publication, but there needs to be clear emphasis on management implications. Modeling papers will be considered where the model is properly verified but it is also highly preferable that management based on the model has been taken and results have been documented. Application of known models to yet another system without a clear advance in resultant management are unlikely to be accepted. Shorter notes that convey important early results of long-term studies or provide data relating to causative agents or management approaches that warrant further study are acceptable even if the story is not yet complete. All submissions are subject to peer review to assure relevance and reliability for management application.