. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Large marine gastropods 1221 DISSIMILARITY LEVEL 0,1 0 2 0 3 0,4 0,5 I 1 \ 1 \ 1 1 \ 1 1 GROUP 2 IN. heros N. ventricosa P. deform is N. Iyrata 8. scatariforme P. kroyeri N. pribiloffensis B. beringii F. oregonensis B. plectrum V. middendorfii B. angulosum C. magna B. polare v. fragHis D- D- 1 Figure 68-2. Dendrogram showing the similarity of fif- teen species of snails. Groups labeled 1 through 4 occur at a dissimilarity level of fragili
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Large marine gastropods 1221 DISSIMILARITY LEVEL 0,1 0 2 0 3 0,4 0,5 I 1 \ 1 \ 1 1 \ 1 1 GROUP 2 IN. heros N. ventricosa P. deform is N. Iyrata 8. scatariforme P. kroyeri N. pribiloffensis B. beringii F. oregonensis B. plectrum V. middendorfii B. angulosum C. magna B. polare v. fragHis D- D- 1 Figure 68-2. Dendrogram showing the similarity of fif- teen species of snails. Groups labeled 1 through 4 occur at a dissimilarity level of fragilis and B. polare, and N. pribiloffensis and B. beringii. The species in these groups are quite similar in the environmental variables which join them and, as can be seen in Fig. 68-1, are also distrib- uted similarly. At higher levels of dissimilarity, species are joined that do not have identical distribu- tions. Thus, the groups formed at these higher levels of dissimilarity may have similar temperature toler- ances but differ in other ecological requirements. If a dissimilarity level of is chosen, then all fifteen species are included in four distinct groups (Fig. 68-2). The combined distribution of all members of each group is shown in Fig. 68-3. Although the four groups appear quite distinct, they may not be statistically different. Two slightly different techniques were used to test for statistical differences. First, Hotelling's "T" (Morrison 1976), a multivariate extension of Student's "t" distribu- tion, was used to test whether each group was statis- tically different from the others when maximum temperature and maximum warming were considered simultaneously. The results of these tests indicated that each group was different from the other three at a probability level of A second method for testing for differences between groups consisted of making univariate "t" tests (Sokal and Rohlf 1969) on each veiriable. This was done bec
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