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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
DOI: 10.2307/2423685
Stable URL: http://www.jstor.org/stable/2423685
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Plant Distribution within a Heron Rookery
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Abstract

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.

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