Fig. 1. Distribution of Gonyostomum semen biomass in different lake aggregation groups between 1997 and 2007 resolved by cluster analysis and simulations analysis; n indicates the number of lakes with biomass values > 0 used in the yearly analyses. The vertical dotted lines indicate discontinuities between successive groups of lakes with similar biomass characteristics. Lakes that fall within these biomass groups are shown by the black dots.

Fig. 1