Similar title to Barot, S., Heino, M. ORCID: https://orcid.org/0000-0003-2928-3940, O'Brien, L., & Dieckmann, U. ORCID: https://orcid.org/0000-0001-7089-0393 (2004). Estimating reaction norms for age and size at maturation when age at first reproduction is unknown. Evolutionary Ecology Research 6 (5) 659-678.