The causes of these differences are
currently speculative, but it appears that phylogenetic
constraints on the relative allocation of structural
compounds (i.e. chitinous versus calcareous exoskeleton,
bony skeleton) may play an important role in
determining gross patterns of consumer elemental
composition. Although not extensive, the studies
available to date span relatively broad geographic
regions and physicochemical conditions, suggesting
that phylogeny, at least at the class level or higher, may
be more important in determining consumer elemental
composition than local environmental conditions or
species composition within a higher taxonomic group
The causes of these differences arecurrently speculative, but it appears that phylogeneticconstraints on the relative allocation of structuralcompounds (i.e. chitinous versus calcareous exoskeleton,bony skeleton) may play an important role indetermining gross patterns of consumer elementalcomposition. Although not extensive, the studiesavailable to date span relatively broad geographicregions and physicochemical conditions, suggestingthat phylogeny, at least at the class level or higher, maybe more important in determining consumer elementalcomposition than local environmental conditions orspecies composition within a higher taxonomic group
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