Anthropogenic nutrients and harmful algae in coastal waters
Gowen, Richard J.
Harrison, Paul J.
Fleming, Lora E.
MetadataShow full item record
Harmful algal blooms (HABs) are thought to be increasing in coastal waters worldwide. Anthropogenic nutrient enrichment has been proposed as a principal causative factor of this increase through elevated inorganic and/or organic nutrient concentrations and modified nutrient ratios. We assess: 1) the level of understanding of the link between the amount, form and ratio of anthropogenic nutrients and HABs; 2) the evidence for a link between anthropogenically generated HABs and negative impacts on human health; and 3) the economic implications of anthropogenic nutrient/HAB interactions. We demonstrate that an anthropogenic nutrient-HAB link is far from universal, and where it has been demonstrated, it is most frequently associated with high biomass rather than low biomass (biotoxin producing) HABs. While organic nutrients have been shown to support the growth of a range of HAB species, insufficient evidence exists to clearly establish if these nutrients specifically promote the growth of harmful species in preference to benign ones, or if/how they influence toxicity of harmful species. We conclude that the role of anthropogenic nutrients in promoting HABs is site-specific, with hydrodynamic processes often determining whether blooms occur. We also find a lack of evidence of widespread significant adverse health impacts from anthropogenic nutrient-generated HABs, although this may be partly due to a lack of human/animal health and HAB monitoring. Detailed economic evaluation and cost/benefit analysis of the impact of anthropogenically generated HABs, or nutrient reduction schemes to alleviate them, is also frequently lacking.
© The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of Environmental Management 146 (2014): 206-216, doi:10.1016/j.jenvman.2014.07.002.
Suggested CitationArticle: Davidson, Keith, Gowen, Richard J., Harrison, Paul J., Fleming, Lora E., Hoagland, Porter, Moschonas, Grigorios, "Anthropogenic nutrients and harmful algae in coastal waters", Journal of Environmental Management 146 (2014): 206-216, DOI:10.1016/j.jenvman.2014.07.002, https://hdl.handle.net/1912/6838
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Macroalgal responses to experimental nutrient enrichment in shallow coastal waters : growth, internal nutrient pools, and isotopic signatures Teichberg, Mirta; Fox, Sophia E.; Aguila, Carolina; Olsen, Ylva S.; Valiela, Ivan (Inter-Research, 2008-09-25)Increased nutrient inputs to temperate coastal waters have led to increased occurrences of macroalgal blooms worldwide. To identify nutrients that are limiting to macroalgae and to determine whether different forms of these ...
Detection of anthropogenic climate change in satellite records of ocean chlorophyll and productivity Henson, Stephanie A.; Sarmiento, Jorge L.; Dunne, John P.; Bopp, Laurent; Lima, Ivan D.; Doney, Scott C.; John, Jasmin G.; Beaulieu, C. (Copernicus Publications on behalf of the European Geosciences Union, 2010-02-15)Global climate change is predicted to alter the ocean's biological productivity. But how will we recognise the impacts of climate change on ocean productivity? The most comprehensive information available on its global ...
Depth of the vadose zone controls aquifer biogeochemical conditions and extent of anthropogenic nitrogen removal Szymczycha, Beata; Kroeger, Kevin D.; Crusius, John; Bratton, John F. (2017-06)We investigated biogeochemical conditions and watershed features controlling the extent of nitrate removal through microbial dinitrogen (N2) production within the surficial glacial aquifer located on the north and south ...