Choice Zanethia D, Frazer Thomas K, Jacoby Charles A
School of Natural Resources and Environment, University of Florida, 103 Black Hall, Gainesville, FL 32611, United States.
School of Natural Resources and Environment, University of Florida, 103 Black Hall, Gainesville, FL 32611, United States; Fisheries and Aquatic Sciences Program, School of Forest Resources and Conservation, University of Florida, 7922 NW 71st Street, Gainesville, FL 32653, United States.
Mar Pollut Bull. 2014 Apr 15;81(1):94-102. doi: 10.1016/j.marpolbul.2014.02.015. Epub 2014 Mar 7.
Seagrasses around the world are threatened by human activities that degrade water quality and reduce light availability. In this study, light requirements were determined for four common and abundant seagrasses along the Gulf coast of peninsular Florida using a threshold detecting algorithm. Light requirements ranged from 8% to 10% of surface irradiance for Halophila engelmannii to 25-27% of surface irradiance for Halodule wrightii. Requirements for all species differed from previous reports generated at other locations. Variations were attributed to morphological and physiological differences, as well as adaptation to light histories at specific locations. In addition, seagrasses were absent from stations with significantly higher concentrations of total nitrogen, total phosphorus, chlorophyll a and color. These results confirm the need to address links between increased anthropogenic nutrient loads, eutrophication, reduced light penetration, and loss of seagrasses and the services they provide.
世界各地的海草受到人类活动的威胁，这些活动会降低水质并减少光照。在本研究中，使用阈值检测算法确定了佛罗里达半岛墨西哥湾沿岸四种常见且数量丰富的海草的光照需求。光照需求范围从恩氏喜盐草对表面辐照度的8%至10%，到赖氏二药藻对表面辐照度的25 - 27%。所有物种的需求与之前在其他地点得出的报告不同。差异归因于形态和生理差异，以及对特定地点光照历史的适应。此外，在总氮、总磷、叶绿素a和色度浓度显著较高的站点没有海草。这些结果证实了有必要解决人为营养负荷增加、富营养化、光穿透减少、海草丧失及其所提供服务之间的联系。
