Nitrogen deposition caused by human activities can lead to an increased phytoplankton production in boreal lakes.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/lakes-respond-differently-nitrogen-disposition
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/environment-news-network
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lakes
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/aquatic-animals