Mikael Elfman
Researcher
New Insights into Fish Ecology via Nuclear Microscopy of Otoliths
Author
Summary, in English
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 the Lund nuclear microprobe, 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). We present case studies of several species, and discuss exciting future directions in this research that is revolutionizing fisheries ecology. ©2003 American Institute of Physics
Department/s
- Nuclear physics
Publishing year
2003
Language
English
Pages
339-342
Publication/Series
AIP Conf. Proc. -- August 26, 2003
Volume
680
Links
Document type
Conference paper
Publisher
American Institute of Physics (AIP)
Topic
- Subatomic Physics
Status
Published
Research group
- Nuclear Microprobe