HR: 1340h
AN: H13E-1371 [Abstracts]
TI: Fish movement and dietary history derived from otolith δ13C
AU: * Weber, P K
EM: weber21@llnl.gov
AF: Lawrencen Livermore National Laboratory, 7000 East Ave
L-231, Livermore, CA 94550
United States
AU: Finlay, J C
EM: jfinlay@umn.edu
AF: University of Minnesota, Ecology, Evolution & Behavior, St. Paul, MN 55108
United States
AU: Power, M E
EM: mepower@berkeley.edu
AF: University of California, Berkeley, Integrative Biology, Berkeley, CA 94720
United States
AU: Phillis, C C
EM: corey@berkeley.edu
AF: University of California, Berkeley, Earth and Planetary Science, Berkeley, CA 94720
AU: Ramon, C E
EM: ramon2@llnl.gov
AF: Lawrencen Livermore National Laboratory, 7000 East Ave
L-231, Livermore, CA 94550
United States
AU: Eaton, G F
EM: eaton3@llnl.gov
AF: Lawrencen Livermore National Laboratory, 7000 East Ave
L-231, Livermore, CA 94550
United States
AU: Ingram, B L
EM: ingram@eps.berkeley.edu
AF: University of California, Berkeley, Earth and Planetary Science, Berkeley, CA 94720
AB:
Habitat use and food web linkages are critical data for fish conservation and habitat restoration efforts, particularly for
threatened salmonids species. Otolith microchemistry has been shown to be a powerful tool for reconstructing fish movement,
but over small distances (kilometers), geology-derived differences in otolith chemistry are rare. Here, we demonstrate that
otolith 13C/12C ratio (i.e. δ13C) of anadromous steelhead trout can be used to distinguish residence in small
streams from residence in larger streams and rivers. While previous research has shown that water dissolved inorganic carbon
d13C is the primary source of carbon in otoliths, the downstream change in food δ13C in this watershed appears to
be the primary control on otolith δ13C. As a result, this method can also be applied to the problem of
reconstructing feeding history at a location.
DE: 0419 Biomineralization
DE: 0424 Biosignatures and proxies
DE: 0439 Ecosystems, structure and dynamics (4815)
DE: 0483 Riparian systems (0744, 1856)
DE: 0491 Food webs and trophodynamics (4817)
SC: Hydrology [H]
MN: Fall Meeting 2005