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Uptake of ⁵⁹FE as a Tool for Study of the Crowding Effect in Biomphalaria Glabrata^*

Crowding of Biomphalaria glabrata simultaneously inhibits growth and iron uptake. Measurement of the absorption of ⁵⁹Fe provides a simple criterion for the estimation of crowding. In this way, crowding effect was demonstrate to be related not only to poplation density but also to population size. An inhibitory factor is present in water and feces derived from crowded snail populations.

Accepted for publication May 28, 1970.

^* This work was supported in part by funds from The Rockefeller Foundation, Conselho Nacional de Pesquisas, and Conselho de Pesquisas da Universidade Federal de Minas Gerais. Contribution Number 6 from the Schistosomiasis Research Unit, Instituto de Ciências Biológicas, Universidade Federal da Minas Gerais, Caixa Postal 1404, Belo Horizonte, Brazil.