Riege, D. A. (University of Maryland University College, 17 Longmeadow Ave., Middletown, RI 02842). Surge in regeneration of Pinus strobus L. in three Wisconsin forests not projected by past demography. J. Torrey Bot. Soc. 139: 299-310. 2012.—Long-term studies of forests are needed to verify theoretical patterns of succession. I investigated three mature pine (Pinus strobus L. and P. resinosa Ait.) forests in northern Wisconsin with compositional records that date back to the 1940s, with particular emphasis on replication of data that I collected in the 1970s. In successional trends from the 1940s to the 1970s, hardwood reproduction generally exceeded that of pine. However, in 2006–2007 the stands showed a surge in regeneration of P. strobus that was not predicted from the past data or common ideas on succession, resulting in bimodal size-class distributions. I suggest a dynamic in which self thinning of mid-successional hardwoods might allow P. strobus regeneration. In another uncommon pattern, Quercus rubra has gained in dominance over Acer saccharum in most parts of a hardwood-dominated section of one forest. Future monitoring will show if the recent resurgence of P. strobus reproduction represents a major shift in the late-successional patterns of these forests.
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