Changes in diversity of benthic animals were assessed for 2001,
2005, and 2006 using the 2 diversity indices taxa richness (the
number of taxa per core) and Simpson diversity index
(D0 ¼ 1 Spi2, where pi is the relative abundance of taxon i).
Temporal variations in the average densities of whole macrofauna
and of some dominant taxa (in which density is higher than 7
individuals/5 cores¼ 395 individuals/m2), taxa richness, and
Simpson diversity index were compared for the seagrass-vegetated
area and nonvegetated areas of K2 and only the nonvegetated areas
of K3 because seagrass vegetation was not found in 2005 and 2006
(see above). At K2, variations in density, taxa richness, and diversity
index were tested by a two-way analysis of variance (ANOVA) using
year and vegetation type as fixed factors. At the nonvegetated areas
of K3, a one-way ANOVA was used to test variation among the 3
years. In cases where significant variation was detected by the
ANOVA, post-hoc comparisons were carried out using Tukey’s
method. At K3, the difference in the univariate indices between two
groups of samples from the different vegetation types in 2001 was
tested using a Student’s t-test. Data were log-transformed in case of
heterogeneous variation.
Changes in diversity of benthic animals were assessed for 2001,2005, and 2006 using the 2 diversity indices taxa richness (thenumber of taxa per core) and Simpson diversity index(D0 ¼ 1 Spi2, where pi is the relative abundance of taxon i).Temporal variations in the average densities of whole macrofaunaand of some dominant taxa (in which density is higher than 7individuals/5 cores¼ 395 individuals/m2), taxa richness, andSimpson diversity index were compared for the seagrass-vegetatedarea and nonvegetated areas of K2 and only the nonvegetated areasof K3 because seagrass vegetation was not found in 2005 and 2006(see above). At K2, variations in density, taxa richness, and diversityindex were tested by a two-way analysis of variance (ANOVA) usingyear and vegetation type as fixed factors. At the nonvegetated areasof K3, a one-way ANOVA was used to test variation among the 3years. In cases where significant variation was detected by theANOVA, post-hoc comparisons were carried out using Tukey’smethod. At K3, the difference in the univariate indices between twogroups of samples from the different vegetation types in 2001 wastested using a Student’s t-test. Data were log-transformed in case ofheterogeneous variation.
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