There are more islands in the Atlantic region (i.e. the Lesser Antilles). Geographical distance between islands might be an important source of similarity in
terms of species richness and taxonomic composition. Two islands may share the
same number of species not because they are similar in area and/or in diversity
because they are geographically close (Rosenzweig 1995), which allows individuals to move easily from one island to the other.
Canonical Correspondence analyses performed on the number of species representing the echinoderm orders and families in the different biogeographical
provinces (Fig. 16.13) are consistent with the previous non-canonical analyses on
species presence-absence data and climatic conditions. Figure 16.13 shows the
results obtained for Atlantic provinces. The environmental variables used were
mean seasonal and mean, minimum, maximum and range of variation annual
values obtained from monthly satellite data for sea surface temperature
(1982–1991) and for chlorophyll (2003–2010). Productivity values were obtained
Fig. 16.17 a Percentage of echinoderm species per class by bathymetric range in the Caribbean
and Atlantic taxonomic list and b percentage of species present in one to six bathymetric
intervals. N = 836 species
16 Latin America Echinoderm Biodiversity and Biogeography
533
terms of species richness and taxonomic composition. Two islands may share the
same number of species not because they are similar in area and/or in diversity
because they are geographically close (Rosenzweig 1995), which allows individuals to move easily from one island to the other.
Canonical Correspondence analyses performed on the number of species representing the echinoderm orders and families in the different biogeographical
provinces (Fig. 16.13) are consistent with the previous non-canonical analyses on
species presence-absence data and climatic conditions. Figure 16.13 shows the
results obtained for Atlantic provinces. The environmental variables used were
mean seasonal and mean, minimum, maximum and range of variation annual
values obtained from monthly satellite data for sea surface temperature
(1982–1991) and for chlorophyll (2003–2010). Productivity values were obtained
Fig. 16.17 a Percentage of echinoderm species per class by bathymetric range in the Caribbean
and Atlantic taxonomic list and b percentage of species present in one to six bathymetric
intervals. N = 836 species
16 Latin America Echinoderm Biodiversity and Biogeography
533