Abstract
IT has long been known that there is a close relation between gradients of rivers and their living population1–5. Many accounts have stressed the way in which these populations (especially fish) tend to move up or down a river, depending on its water-level and rate of flow. I have noticed that lampreys and their larvæ do not seem to do this. Apart from those instances where, during severe drought or drought followed by flooding, ammocoete beds dry out or are washed away, such beds and the ammocoetes in them usually remain where they are whatever the state of the river.
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BAXTER, E. Lamprey Distribution in Streams and Rivers. Nature 180, 1145 (1957). https://doi.org/10.1038/1801145a0
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DOI: https://doi.org/10.1038/1801145a0
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