K.E. Limburg1,
M. Elfman2, P. Kristiansson2, D. Bilderback3,
R. Huang3
1SUNY College of Environmental Science & Forestry, Syracuse, NY 13210
2 Department of Nuclear Physics, Lund Technical University, Lund, Sweden
3 Cornell
High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853
Abstract. Otoliths, or earstones, are small, biogenic concretions of aragonitic calcium carbonate precipitated on a protein matrix. Otoliths form part of the hearing and balance system in teleost fishes, and grow as the fish grow, providing a continuous biochronology of growth. Various elements are entrained in minor and trace quantities. In particular, strontium is a useful scalar of habitat use when variable environmental gradients exist. By mapping elemental concentrations and ratios with advanced microbeam methods, we have used strontium in many cases as a proxy for salinity, because Sr:Ca values are roughly an order of magnitude higher in marine vs most fresh waters. In addition, zinc shows strong seasonal variations in salmoniform fishes (salmons, charrs, and whitefishes have been tested to date), and recent work at CHESS has revealed the exciting promise of additional tracers. We present case studies of several species, and discuss exciting future directions in this revolutionizing field of fisheries ecology.