Presence of a Late Pleistocene Drainage System Manifested through Depredation of Red Pine by Gremmeniella Abietina

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Abstract
Residual beaches and terraces, results of wave action and sorting of glacial till at the margins of glacial and postglacial lakes prevail in the Great Lakes area of the Canadian Precambrian Shield. Relict drainage systems were identified on 2 such terraces by virtue of their dendritic pattern, gradient and relationship to the erosion sequence of an adjacent river. These minor topographic indentations became apparent through selective depredation by a fungus pathogen of pines planted within the troughs. The relict fluvial system now functions as a cold air damage system, concentrating and directing airborne spores of the pathogen. Surviving trees outline the troughs, serving as biological indicators of trough positions.

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