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Elemental stoichiometry of freshwater fishes in relation to phylogeny, allometry and ecology
Author(s) -
Hendrixson H. A.,
Sterner R. W.,
Kay A. D.
Publication year - 2007
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2006.01280.x
Subject(s) - biology , allometry , interspecific competition , ecological stoichiometry , phylogenetics , ecology , trophic level , zoology , phylogenetic tree , guild , habitat , nutrient , biochemistry , gene
Twenty species of freshwater fishes were collected from Minnesota, Iowa and Michigan and their whole‐body carbon, nitrogen and phosphorus contents and the respective C:N:P ratios were determined. Patterns were examined in intra‐ and interspecific variation, allometry and variation caused by habitat and trophic level in whole fish while controlling for the role of phylogeny. Stoichiometric variation was greater across than within species, C:N:P allometry was species‐specific, nutrient content within a species was somewhat habitat‐specific and P concentration showed a strong phylogenetic signal. Stoichiometric relationships with allometry and feeding guild were observed but were not significant in an analysis accounting for non‐independence of closely related species. Supportive evidence for the hypothesis that the considerable variation in whole fish phosphorus concentrations could be ascribed to differences in bone and scale development, as previously suggested, is shown. Whole fish Ca:P ratios had a nearly constant stoichiometry consistent with the chemical signature of bone. This result combined with a phylogenetic signal for fish P indicated that the great stoichiometric variability among fish taxa in P content was derived almost entirely from skeletal investment.