The reproductive success of tree swallows nesting near experimentally acidified lakes in northwestern Ontario. Vincent, L., S., L. & Barlow, J., C. Canadian Journal of Zoology, 71(6):1090-1097, 1993.
The reproductive success of tree swallows nesting near experimentally acidified lakes in northwestern Ontario [pdf]Paper  abstract   bibtex   
Examined reproductive parameters of Tachycineta bicolor breeding near acidified lakes in NW Ontario. Eggs were smaller in certain dimensions, hatching success was lower (and by definition fewer nestling fledged per nest box), certain nestling body characters were smaller four days posthatch, nestling wing length was shorter near time of fledging, and growth functions were different from those near unmanipulated reference lakes. Results are consistent with findings that Ca-rich food items needed for egg production by laying females and growth of nestlings are scarcer at acidifed lakes, and that potentailly toxic metals accumulate to higher concentrations both in the chironomids that swallows consume and in nestling swallows at acidified lakes. -from Authors

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