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The three‐spined stickleback (Gasterosteus aculeatus) has repeatedly and independently adapted to freshwater habitats from standing genetic variation (SGV) following colonization from the sea. However, in the Mediterranean Sea G. aculeatus is believed to have gone extinct, and thus the spread of locally adapted alleles between different freshwater populations via the sea since then has been highly...
Adaptation to novel environments can be based either on standing genetic variation or variation attributable to new mutations. When standing genetic variation for a functional adaptation is lacking, and variation due to new mutations is not yet available, adaptation is possible only through alternative functional solutions. Reduction in the number of bony lateral plates as an adaptation to freshwater...
The fact that the intraspecific genetic differentiation in neutral genetic markers and genes coding for adaptive traits are not typically correlated has caused a great deal of conceptual and practical trouble in delimitation of conservation units. Although the importance of combining information on adaptive genetic divergence with information on historical and recent gene flow in the delimitation...
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