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Plant Distribution within a Heron Rookery
D. Vaughn Weseloh and Robert T. Brown
The American Midland Naturalist
Vol. 86, No. 1 (Jul., 1971), pp. 57-64
Published by: The University of Notre Dame
Stable URL: http://www.jstor.org/stable/2423685
Page Count: 8
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An island rookery of approximately 8000 Ardeidaean birds in west-central Minnesota was mapped and divided into three areas of use: heavy, light and none. Quadrats, 1 m on a side, were used to sample these three areas for floristic composition, soil nutrients and pH, light regime and great blue heron nest concentration. The results support previous work on oceanic rookeries showing a reduction in plant density in areas of high avian activity. The distribution of 21 plant species discussed, with relation to the three areas of activity, is limited neither by the summer light intensity nor the concentration of nutrients measured during the winter.
The American Midland Naturalist © 1971 The University of Notre Dame