from Bode it seems, that the negative effect in their approach is larger than what we would expect from our simulation for the general, non-regular case (Section \[sec:discussion:regul\]). Additional simulations performed for metapopulations likewise subjected to non-regular dispersal patterns but reduced to the size of $10$ patches indicated a general increase in the probability of extinction but no significant impact of metapopulation size on the impact of symmetry. We therefore assume, that the differences related to symmetry observed by @Bode08 partly are owed to the fact, that the patterns in their study were generated from a particular symmetric starting configuration of the small world algorithm and that the similarity of patterns to this starting configuration correlates with the symmetry properties.

Recently another work was devoted to the effect of asymmetry on metapopulation viability [@Vuilleumier10]. This work aims to cover different aspects of asymmetry simultaneously, which makes it difficult to ascribe the variety of effects observed to certain properties of dispersal matrices. One configuration, however, seems to be equivalent to the simulations we performed for general dispersal matrices in Section \[sec:discussion:regul\] for anti-symmetric and symmetric dispersal, respectively [@Vuilleumier10 p. 229, Fig. 2, right column]. The results the authors obtain on these 