A low mean performance and a low level of variability of seed families may be of minor importance in large populations, but critical in small ones. -from Authors
van Andel, J., Wesselingh, R., & Van Donk, H. J. (1988). The performance of progeny groups from two populations of Phyteuma nigrum, with particular reference to the chance of survival or extinction. Acta Botanica Neerlandica, 37(2), 165-169. https://hdl.handle.net/2078.5/60412 (Original work published 1988)