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Geography Department - Biogeography Lab |
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Northern Illinois University |

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Shannon McCarragher - smccarra@niu.edu
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PERSONNEL |

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My research explores: (A) whether seed origin affects sugar maple germination and growth rates in the field, and (B) whether temperature at and above the optimal germination temperature (1 degree Celsius) affects sugar maple germination in a laboratory growth chamber. To address those topics, sugar maple samaras were collected from sites near sugar maple's northern, central, and southern portions of its range. Seeds from the northern, central, and southern locations were then redistributed into reciprocal transplant plots at the northern and central study sites. Subsequent measurements, such as growth and success rates, were taken from the reciprocal transplant plots over a two year period. Simultaneously, seeds from each location were also placed in a growth chamber for three, three-month germination trials, at different temperatures (1, 7, and 14 degrees Celsius). From those lab trials, baseline germination viability rates are obtained. |
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