Fig. 4
From: Collective behavior as a driver of critical transitions in migratory populations
Collapse of local adaptation (Model 2). Equilibrium size of total population, N h +N s , (black curve), fraction of the population which is locally adapted, \(\frac {N_{h}}{N_{h} + N_{s}}\), (solid blue curve) and the fraction of the population which is returning to their natal site (dashed blue curve) as a function of additional mortality. Parameters are as in Fig. 3 c. For modest levels of local adaptation (here p=0.7) the population size declines nearly linearly as a function of additional mortality. However, the locally adapted fraction of the population crashes dramatically, and non-linearly, at a level of h for which the homing rate is still high and the population size seems robust