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Hurricanes are infrequent but influential disruptors of ecosystem processesin the southeastern Atlantic and Gulf coasts. Every southeastern forestedwetland has the potential to be struck by a tropical cyclone. We examined theimpact of Hurricane Hugo on two paired coastal South Carolina watersheds interms of streamflow and vegetation dynamics, both before and after thehurricane's passage in 1989. The study objectives were to quantify themagnitude and timing of changes including a reversal in relativestreamflow difference between two paired watersheds, and to examine theselective impacts of a hurricane on the vegetative composition of the forest.We related these impacts to their potential contribution to change watershedhydrology through altered evapotranspiration processes. Using over 30 years of monthly rainfall and streamflow data we showed that there was asignificant transformation in the hydrologic character of the two watersheds– a transformation that occurred soon after the hurricane's passage. Welinked the change in the rainfall–runoff relationship to a catastrophicchange in forest vegetation due to selective hurricane damage. While bothwatersheds were located in the path of the hurricane, extant forest structurevaried between the two watersheds as a function of experimental forestmanagement techniques on the treatment watershed. We showed that the primarydamage was to older pines, and to some extent larger hardwood trees. Webelieve that lowered vegetative water use impacted both watersheds withincreased outflows on both watersheds due to loss of trees followinghurricane impact. However, one watershed was able to recover to pre hurricanelevels of evapotranspiration at a quicker rate due to the greater abundanceof pine seedlings and saplings in that watershed

Hurricane impacts on a pair of coastal forested watersheds: implications of selective hurricane damage to forest structure and streamflow dynamics