Figure legends:
Figure 1 : Map of Ånnsjön and its position in Sweden including
the locations where minnows where caught in the lake (L1, L2, L3) and
the surrounding tributaries (S1, S2, S3). © Landmäteriet.
Figure 2: Position of the 35 digitized landmarks used in
geometric morphometrics. Homologous landmarks (red dots): 1-4 : most
posterior, dorsal, anterior, and ventral point of orbit; 5: insertion of
pectoral fin; 6-8: most posterior, dorsal, and ventral margin of
opercular (principal opercular bone); 9: tip of the snout; 12: dorsal
transition head to body; 16: anterior insertion of dorsal fin; 17:
posterior insertion of dorsal fin; 21: dorsal insertion of caudal fin;
22: ventral insertion of caudal fin; 26: posterior insertion of anal
fin, 27: anterior insertion of anal fin; 30: anterior insertion of
pelvic fin; 33: ventral transition head to body. Semi landmarks (blue
dots) were based on proportional distances between homologous
structures.
Figure 3: Results of geometric morphometrics. a) Shape
differences between minnows caught in the lake (blue line) and the
streams (green line). Shape-change outlines of Discriminant Function
Analyses are magnified threefold. b) Ordination of shape based on
Canonical Variate Analyses of minnows caught in the six different
locations with confidence ellipses (probability 0.9) drawn for lake and
stream habitats respectively.
Figure 4: Average proportions of gut content of minnows caught
in the lake (L1, L2, L3) and the streams (S1, S2, S3).
Figure 5 : Relationship between proportion of zooplankton in the
minnow guts and morphological distances (canonical variate 1), including
results of Spearman’s rank correlation.