Data from: Interannual shifts in brook trout anadromy inferred by stable isotopes and otolith microchemistry

The marine parental contribution to brook trout (Salvelinus fontinalis)
populations was examined in coastal watersheds in Atlantic Canada. Stable
isotope analysis (13C, 15N, 34S) of eggs and primordia (core) otolith
microchemistry (Sr:Ca, Ba:Ca) from juveniles were used as tracers of
maternal life history. The isotopic signature and the microchemistry
techniques independently identified three maternal contingents: resident,
anadromous, and estuarine/anadromous. Pb:Ca was revealed as a third
freshwater tracer for maternal influence. The interannual variability in
the contribution of marine mothers to juveniles exhibited a striking
variation between years.