Stable isotope bi-plots for each year, illustrating the isotopic niche of carp and crayfish.

<p>The black circles represent individual crayfish and the open circles represent individual carp. The lines enclose the standard ellipse area (SEA<sub>c</sub>) for each year for both crayfish (solid) and carp (dashed). Mean values of resource points are also shown; benthic FPOM (open square), plant debris (cross), submerged plants (open diamond), chironomids (open triangle) and oligochaetes (asterisk).</p>