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Fig. 3 | BMC Evolutionary Biology

Fig. 3

From: The temporal window of ecological adaptation in postglacial lakes: a comparison of head morphology, trophic position and habitat use in Norwegian threespine stickleback populations

Fig. 3

Comparison of head shape among Norwegian marine and freshwater threespine sticklebacks. Landmark-based head shape is given for PC1 versus PC2. The interpreted head shape (based on analysis in software MorphoJ) represents fish at the extreme of the respective distributions on both axes. Blue symbols indicate marine fish from the island of Andøya (Andenes harbour) while black symbols represents freshwater lake populations

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