James Wollack. St. John's University; Biology Department; Collegeville, MN 56321.
Over the past century the average mean surface temperature across the globe has increased between 0.5 and 0.7 degrees C. One of the impacts of this temperature change may be the earlier blooming of spring wildflowers. A recent study (Root et al., 20003) showed that there has been a shift of 5 days per decade over the past fifty years to earlier flowering. We analyzed herbarium specimens of Hepatica americana to determine if this trend is apparent to central Minnesota. Specimens from the herbaria of Saint Cloud State University, College of Saint Benedict/Saint Johnís University and the University of Minnesota were examined. Flowering data were collected and then statistically analyzed. Preliminary results show that during the past 80 years there is a trend for H. americana to flower earlier. Results from statistical analysis of these data are in progress.
James is pictured here with Dr. Jorge Arriagada, St. Cloud State University.
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