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Pictured Rocks National Lakeshore A mantle of snow creates a winter wonderland at Sand Point within Pictured Rocks National Lakeshore.
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Pictured Rocks National Lakeshore
Freshwater Plants
Marsh marigolds bloom in bright yellow along a springtime stream.

NPS photo

Marsh marigolds along a stream

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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Pictured Rocks National Lakeshore and the Hiawatha National Forest share a visitor center at 400 E. Munising Ave. in Munising, Michigan.

Did You Know?
Pictured Rocks National Lakeshore shares a visitor center with the Hiawatha National Forest. The interagency visitor center was dedicated in 1988, and serves over 40,000 people annually. Other federal interagency visitor centers are located in Alaska, Utah, California, and Idaho.
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Last Updated: February 02, 2011 at 09:35 MST