Seabirds shaped the expansion of pre-Inca society in Peru
Fig 5
Isotope space size and overlaps.
Plotted isotope space kernel utilization density functions (KUD; top row) and standard ellipse areas (SEA; bottom row) comparing Chincha maize with maize grown under different experimental fertilizer conditions [16]. Columns display results at commonly selected contour levels – 75% and 95%.