NDLI: Reduced Cover of Drifting Macroalgae Following Nutrient Reduction in Danish Coastal Waters

Content Provider	Springer Nature Link
Author	Rasmussen, Jonas Ribergaard Dromph, Karsten Michael Göke, Cordula Krause Jensen, Dorte
Copyright Year	2014
Abstract	Based on a large dataset from the national Danish monitoring programme, we analysed the temporal variability of drifting algae cover in shallow (1–2 m) water during a period of reduced nutrient loadings. Algal cover was analysed both in absolute terms and relative to eelgrass, Zostera marina, cover to test the hypotheses that (1) the cover of drifting algae and the relative dominance of algae versus eelgrass in shallow waters have declined in parallel to reductions in nutrient levels during the last decades, and (2) spatio-temporal differences in algal cover can be related to differences in nutrient conditions and environmental characteristics. The cover of drifting algae was positively related to total nitrogen concentration and Secchi depth but negatively related to exposure, salinity and mean summer temperature. The cover of drifting macroalgae showed significant declines over the past two decades, paralleling the reduction in nutrient concentrations. The present cover of drifting algae is low (<10 %) and probably pose little threat to the general distribution of eelgrass in shallow Danish waters though local accumulations may still be harmful. However, the ratio between drifting algae cover and eelgrass cover showed no significant trend, reflecting that eelgrass cover had not increased despite the reduced levels of nutrients and drifting algae. This ratio also showed no consistent relationship to water quality probably because different regulation mechanisms govern drifting algae and eelgrass, and feedback mechanisms may delay eelgrass recovery. Reduced drift algal cover may be an early sign of improved ecological status, while further improvements in terms of recovery of eelgrass meadows have longer perspectives.
Starting Page	1664
Ending Page	1677
Page Count	14
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	38
Issue Number	5
e-ISSN	15592731
Language	English
Publisher	Springer US
Publisher Date	2014-12-03
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Drift algae Eelgrass Zostera marina Nitrogen Nutrients Relative exposure index Environment Ecology Freshwater & Marine Ecology Environmental Management Coastal Sciences Water and Health
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Reduced Cover of Drifting Macroalgae Following Nutrient Reduction in Danish Coastal Waters

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Reduced Cover of Drifting Macroalgae Following Nutrient Reduction in Danish Coastal Waters

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