Bob Sanders participated in writing a paper on the biogeography of protists that have an innate ability to photosynthesize, but also are phagotrophic.

Leles, S.G., A. Mitra, K.J. Flynn, U. Tillmann, D. Stoecker, H.J. Jeong, J. Burkholder, P.J. Hansen, D.A. Caron, P.M. Glibert, G. Hallegraeff, J. Raven, R.W. Sanders, M. Zubkov. 2019. Sampling bias misrepresents the biogeographic significance of constitutive mixotrophs across global oceans. Global Ecology and Biogeography 28:418-428. [doi: 10.1111/geb.12853]