The null hypothesis of the test
is that the normalized distributions of the two populations (in our
case species) are the same. The Syrjala-test is sensitive to differences
in distribution, but is insensitive to differences in abundance
between the two populations. Statistical significance was determined
by a randomization test (1000 iterations). The Syrjala-test
was also used to test for significant inter-annual differences in
the distribution of each species. In this case, for each paircomparison,
the samples were restricted to stations sampled in
both years.
Since some studies have suggested significant interactions between
Aurelia aurita and Cyanea capillata (Båmstedt et al., 1997;
Hansson, 1997), the possible existence of an association between
A. aurita and Cyanea spp. abundances was investigated through
Spearman's rank correlations.
The null hypothesis of the test
is that the normalized distributions of the two populations (in our
case species) are the same. The Syrjala-test is sensitive to differences
in distribution, but is insensitive to differences in abundance
between the two populations. Statistical significance was determined
by a randomization test (1000 iterations). The Syrjala-test
was also used to test for significant inter-annual differences in
the distribution of each species. In this case, for each paircomparison,
the samples were restricted to stations sampled in
both years.
Since some studies have suggested significant interactions between
Aurelia aurita and Cyanea capillata (Båmstedt et al., 1997;
Hansson, 1997), the possible existence of an association between
A. aurita and Cyanea spp. abundances was investigated through
Spearman's rank correlations.
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The null hypothesis of the test
is that the normalized distributions of the two populations (in our
case species) are the same. The Syrjala-test is sensitive to differences
in distribution, but is insensitive to differences in abundance
between the two populations. Statistical significance was determined
by a randomization test (1000 iterations). The Syrjala-test
was also used to test for significant inter-annual differences in
the distribution of each species. In this case, for each paircomparison,
the samples were restricted to stations sampled in
both years.
Since some studies have suggested significant interactions between
Aurelia aurita and Cyanea capillata (Båmstedt et al., 1997;
Hansson, 1997), the possible existence of an association between
A. aurita and Cyanea spp. abundances was investigated through
Spearman's rank correlations.
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