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, Betula's 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

North side 110.9 (10.7) 4.7 (3.4) 2.3 (1.3) 5.5 (2.9)

Eight separate t-tests were performed, four on the density (ind ha-1) of adult Betula, and another four on the basal area (cm2 m-2) of the adult Betula. For Betula lenta, the basal area (cm2 m-2) was significantly higher on the north versus the south face of the mountain range (t = 9.435; P * 0.001). For mean density (ind ha-1) of Betula lenta, the data was significantly higher on the north versus the south face of the mountain range (t = 10.26; P * 0.001). For Betula lutea, mean basal area (cm2 m-2) was higher on the north-facing slope (Fig 1), but was not significant (t = 1.343; 0.1 * P * 0.2). For mean densities of Betula lutea, it was higher on the north face, but was not significant (Table 1) (t = 1.382; 0.1 * P * 0.2). For Betula papyrifera also the mean basal area was higher on the northern-facing slope of the range (Fig 1), but the test found it not significant (t = 1.651; 0.1 * P * 0.2). For the mean density of Betula papyrifera (ind ha-1) the data was marginally significant (t = 1.769; 0.05 * P * 0.1). For Betula populifolia, again the mean basal area (cm2 m-2) was larger on the north face of the range, but the tests of the data found them not significant (t = 1.480; 0.1 * P * 0.2), but like Betula papyrifera, the mean density of Betula populifolia (ind ha-1) was marginally significant (t = 1.896; 0.05 * P * 0.1).

Some common words found in the essay are:
Holyoke Range, Betula Betula, Betula Holyoke, Northern Hemisphere, Adults North, Results Mean, Frequency Betula, Harvard Forest, Carlton Lezberg, Legend Fig, holyoke range, betula lenta, basal cm2 m-2, mountain range, cm2 m-2, basal cm2, birch tree, transect line, mean basal, * *, south mountain, south mountain range, betula holyoke range, mean basal cm2, 00 00 00,
Approximate Word count = 1925
Approximate Pages = 8 (250 words per page double spaced)