Fig. 16.12 Number of echinoderm species shared by two countries as a function of the distance
between them. Distances have been calculated using the geographical coordinates at the midpoint
of their shorelines
Fig. 16.13 Ordination of
samples (biogeographical
areas) and environmental
variables (a) and families
(b) in the representations of
the first axes of the canonical
correspondence analysis
(CCA) performed on the
matrix containing the number
of species representing the
echinoderm orders and
families in the different
Atlantic biogeographical
provinces
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