https://bms-986165inhibitor.co....m/characterization-o
We investigated the rheotaxis of guppies above barrier waterfalls in the Aripo and Turure rivers in Trinidad-the later on having been introduced in 1957 from a below-waterfall populace in another drainage. We predicted that, as a result of powerful choice against downstream emigration, both of these above-waterfall populations should show strong good rheotaxis. Matching these expectations, both populations indicated large levels of positive rheotaxis, possibly showing modern (fast
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