CS15 Fish
Date: Tuesday, June 11, 2002
Location: Poster Session - VCC
 
HendrixsonHA, University of Minnesota, St. Paul, USA, hend0074@tc.umn.edu
Sterner, R, W, University Of Minnesota, St. Paul, USA, stern007@tc.umn.edu
 
STOICHIOMETRY OF FISH IN RELATION TO ALLOMETRY AND PHYLOGENY, AND THE ROLE OF PHOSPHORUS IN SKELETAL STRUCTURE
image
Variability exists in the elemental stoichiometry of fish. Understanding this variability is important because of the role fish play in nutrient dynamics of freshwater systems. We collected a variety of fish species from Minnesota, Iowa, and Michigan and assessed their C:N:P ratios and concentrations of 15 other elements. We examined intra- and interspecific variation, allometric patterns, and phylogenetic trends in elemental concentrations in whole fish. The data support our hypotheses that stoichiometric variation is greater interspecifically than intraspecifically, N:P ratios decrease with length of fish, and variation in nutrient ratios are related to phylogenetic lineages. Many researchers report variation in whole fish phosphorus concentrations. Phosphorus concentration in bone may drive these differences, especially across broad taxonomic groups. We also report on the role of phosphorus in skeletal structure and how it changes allometrically and phylogenetically. The data indicate that bone phosphorus drives phylogenetic and allometric variation in phosphorus concentrations of fish.