Are female offspring from a single-egg seabird more costly to raise?

Kristensen, D.L., Erikstad, K.E., Reiertsen, T.K., Moum, T., Barrett, R.T., Jenni-Eiermann, J. 2012. Are female offspring from a single-egg seabird more costly to raise? Behavioral Ecology. DOI: 10.1093/beheco/ars144