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A spatially explicit census reveals population structure and recruitment patterns for a narrowly endemic pine, Pinus torreyana

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Abstract

We conducted a census of the rare pine, Pinus torreyana ssp. torreyana, to determine (a) its population size and whether it is stable, growing, or declining; (b) the spatial variation in population structure; (c) the spatial patterning of trees in different life stages; and (d) the environmental factors that are related to seedling recruitment. Trees were classified into four stage classes: adult (>160 cm tall with cones); sub-adult (>160 cm without cones); saplings (30–160 cm); and seedlings (<30 cm). Stem diameter was measured for adults and sub-adults, and height for saplings and seedlings. Stands were defined by spatial clustering of the tree map. Univariate and bivariate point pattern analyses were used to explore spatial patterns for adult and juvenile trees and identify potential stand development processes such as density dependence, dispersal limitations, and patchy recruitment. Logistic regression was used to analyze seedling establishment and survival in relation to environmental variables derived from digital maps. Earlier studies reported little or no recruitment. We mapped 5,394 individuals, and tree size had “reverse J-shaped” distribution suggestive of a recruiting population. However, population structure was variable among stands. The predominant spatial pattern detected for adult and juvenile trees was clustering at lag distances <10 m. Bivariate pattern analysis did not suggest repulsion between adult and juvenile size classes. Seedlings tended to be found close to adults and on certain soil types. This suggests that the clustered patterns resulting from patchy recruitment of juveniles persist over time.

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Acknowledgments

This study was supported in part by the Torrey Pines Association. We thank D. Smith, California State Parks, J. Kummer, TPSR, and D. Deutschman and L. Beck, San Diego State University. L. Hierl, F. Bozzolo, and K. Valenti assisted us in the field work. L. Zelus also helped us immeasurably in the field and with many aspects of this project.

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Authors and Affiliations

  1. Department of Biology, San Diego State University, San Diego, CA, 92182-4614, USA

    Janet Franklin & Elizabeth V. Santos

  2. School of Geographical Sciences and Urban Planning and School of Life Sciences, Arizona State University, P.O. Box 875302, Tempe, AZ, 85287-5302, USA

    Janet Franklin

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  1. Janet Franklin
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  2. Elizabeth V. Santos
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Correspondence to Janet Franklin.

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Franklin, J., Santos, E.V. A spatially explicit census reveals population structure and recruitment patterns for a narrowly endemic pine, Pinus torreyana . Plant Ecol 212, 293–306 (2011). https://doi.org/10.1007/s11258-010-9822-x

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  • DOI: https://doi.org/10.1007/s11258-010-9822-x

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