title: On invasion boundaries and the unprotected coexistence of two strategies.
abstract: In this paper we present, in terms of invasion fitness functions, a sufficient condition for a coexistence of two strategies which are not protected from extinction when rare. In addition, we connect the result to the local characterization of singular strategies in the theory of adaptive dynamics. We conclude with some illustrative examples.
authors.affiliation: Department of Mathematics and Statistics, University of Helsinki, P.O. Box 68, Gustaf Hallstromin katu 2b, 00014, Helsinki, Finland. tadeas.priklopil@helsinki.fi
authors.forename: Tadeas
authors.initials: T
authors.lastname: Priklopil
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D005260:Female; D008297:Male; D052586:Mating Preference, Animal; D015233:Models, Statistical; D011157:Population Dynamics