On the cost of vertical migration: are feeding conditions really worse at greater depths?

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Winder, M., Boersma, M., & Spaak, P. (2003). On the cost of vertical migration: are feeding conditions really worse at greater depths? Freshwater Biology, 48(3), 383-393. https://doi.org/10.1046/j.1365-2427.2003.00995.x