Corrigendum to: Heavy with child? Pregnancy status and stable isotope ratios as determined from biopsies of humpback whales. Issue 1 (10th May 2019) - Clark, Casey T; Fleming, Alyson H; Calambokidis, John; Kellar, Nicholas M; Allen, Camryn D; Catelani, Krista N; Robbins, Michelle; Beaulieu, Nicole E; Steel, Debbie; Harvey, James T