Variation in Recruitment and Early Demography in Pinus Rigida Following Crown Fire in the Pine Barrens of Long Island, New York
crown ﬁre, demographic variation, dwarf pine plains, pine seedling growth, plant demography, recruitment limitation, seedling recruitment, seedling survival
Digital Object Identifier (DOI)
Following severe, stand-replacing ﬁres in 1995, we quantiﬁed emergence, growth and survival in Pinus rigida seedlings in eight stands in three areas of the pine barrens of Long Island, New York, USA, and examined factors contributing to spatial and temporal variation in recruitment.
We followed 6431 marked seedlings in the ﬁrst cohort following ﬁre, as well as additional cohorts in subsequent years, for 7 years to assess the effects of ﬁre intensity, soil characteristics, intraspeciﬁc density, interspeciﬁc competition and facilitation on variation in early demography at three different scales. We found substantial variation in many of the demographic parameters measured between plots within stands (10–50 m apart), among stands within areas (600– 1500 m apart), and among forest areas (5 –30 km apart), as well as among years.
Almost all adult P. rigida in most of the stands studied were killed by the 1995 ﬁres and population recovery therefore depended upon recruitment from seed. Initial recruitment appears to be largely determined by seed limitation, which was affected by ﬁre intensity combined with serotiny and other factors.
Subsequent seedling survival and growth were determined largely by inherent differences among areas and sites in factors including cover of the shrub Quercus ilicifolia and soil texture and composition.
Initial seedling density, and subsequent survival and growth, varied among plots within sites, among sites within areas, and among areas. Early survival was negatively correlated with intraspeciﬁc seedling density, but was enhanced by neighbouring Q. ilicifolia, although these shrubs inhibited later seedling growth. Early demographic variation may determine many of the differences observed among mature populations in this landscape.
Variation in demographic parameters across space and time, and over a hierarchy of scales, may have critical consequences at the population, community and landscape levels. A comprehensive evaluation of the nature and extent of such demographic variation across different systems would have major implications for understanding vegetation patterns at the population, community and landscape levels.
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Citation / Publisher Attribution
Journal of Ecology, v. 93, p. 607-617
Scholar Commons Citation
Landis, R. Matthew; Gurevitch, Jessica; Fox, Gordon A.; Wei, Fang; and Taub, Daniel R., "Variation in Recruitment and Early Demography in Pinus Rigida Following Crown Fire in the Pine Barrens of Long Island, New York" (2005). Integrative Biology Faculty and Staff Publications. 85.