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Temperature and Betula distribution on the Holyoke Range Massachusetts Jean L Binjour Jr SS 025648899 Department of Biology University of Massachusetts Amherst Mass 01003 Abstract In this study it will be tested whether temperature affects tree densities in the genus Betula on different slopes of the Holyoke Range specifically the north and south faces of the mountain range My prediction is that the north face of the mountain will have a higher density of these trees than the south face of the range because of the temperature differences of the north slope being warmer than south slope for the range of growth for these trees This experiment can be used to predict patterns of vegetation in other similar latitudes and slopes around the world On September 20 2000 the birch tree genus Betula density was measured on the north face of the Holyoke Range and on September 27 2000 Betulas density was also measured but on the south face of the Holyoke Range There were eight sites laid across a 150m transect line running across the slope starting from a subjectively chosen point Based on the data collected on the Holyoke Range the birch trees densities were not significantly higher on the north face than on the south face of the mountain range Eight separate t-tests were performed four on the density of the adult birch trees and another four on the basal density of adult birch trees From this data analysis it was possible to determine that the results were due to chance not congruent with my prediction From the results of my data it can be concluded that temperature is not a factor in the tree density of Betula In fact temperature is not the only factor that can determine the growth of Betula or other species of trees Certain biotic and abiotic factors that can explain vegetation patterns of similar
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