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Pictured Rocks National Lakeshore
Freshwater Plants
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NPS photo | Marsh marigolds along a stream |
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The phytoplankton of the inland lakes of Pictured Rocks National Lakeshore include at least 51 taxa of blue-green algae (Cyanophyta), dinoflagellates (Pyrrhophyta), yellow-brown algae (Chrysophyta), diatoms (Bacillariophyta), and green algae (Chlorophyta). Seasonal fluctuations occur in the relative densities of these unicellular plants.
Dominant taxa include the diatoms Asterionella formosa, Fragillaria intermedia, Aulocoseira islandica, and Tabellaria fenestrata and the blue-green algae Aphanizomenon flosaquae, Aphanocapsa rivularia, Chroococcus limneticus, and Lyngbya birgei. The filamentous green alga, Bulbochaete sp., is found attached to submerged logs in softwater Legion Lake. Diatoms of this acidic lake are typically benthic, and, due to limited dissolved silica, are not preserved in the sediments.
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Did You Know?
Mineral stains give color to the famous cliffs of Pictured Rocks National Lakeshore. Red and orange colors are iron, black is manganese, white is limonite, and green is a trace of copper. There are no pictographs or petroglyphs on the Pictured Rocks cliffs (that we know of).
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Last Updated: December 04, 2006 at 13:21 EST |