Aluminum binding to ion exchange sites in acid-sensitive versus acid-tolerant cladocerans.
Two acid-sensitive cladocerans, Daphnia galeata mendotae and D. retrocurva, and one acid-tolerant one, Bosmina longirostris, were exposed for 24 h to pH 5.0 and 200 microg liter(-1) total Al. The entire procedure was replicated on three dates in summer 1989. Mortality rates were determined, and the extent of Al binding to ion exchange sites determined using hematoxylin staining. Both daphnids consistently experienced near 100% mortalities, while mortalities for B. longirostris were always near zero. The daphnids showed marked Al binding at the maxillary glands, the site of ion exchange, while B. longirostris showed no noticeable Al binding.
Havens
K E
KE
Department of Biological Sciences and Water Resources Research Institute, Kent State University, Kent, Ohio 44242, USA.