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Fine-Scale Genetic Structure in Pinus Clausa (Pinaceae) Populations: Effects of Disturbance History

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Fine-Scale Genetic Structure in Pinus Clausa (Pinaceae) Populations: Effects of Disturbance History Heredity 87 (2001) 99±113 Received 22 August 2000, accepted 30 April 2001 Fine-scale genetic structure in Pinus clausa (Pinaceae) populations: effects of disturbance history KATHLEEN C. PARKER* , J. L. HAMRICKà, ALBERT J. PARKER & JOHN D. NASONà Department of Geography, University of Georgia, Athens, GA 30602, àDepartments of Botany and Genetics, University of Georgia, Athens, GA 30602 and §Department of Botany, Iowa State University, Ames, IA 50011, U.S.A. Spatial autocorrelation analyses of 12 allozyme loci were used to compare genetic structure within populations of two varieties of Pinus clausa. P. clausa var. immuginata populations tend to be uneven- aged, with continuous recruitment in small gaps created by wind damage, whereas P. clausa var. clausa populations are more even-aged, with recruitment postdating periodic canopy ®res. Three var. immuginata populations and three matched pairs of var. clausa populations, including both a mature and a nearby recently burned population, were examined. Aggregation of multilocus genotypes at small distances was evident in all young var. clausa populations. Little inbreeding was apparent among juveniles or adults in these populations; their genetic structure is likely to have resulted from limited seed dispersal. Genotypes were not signi®cantly spatially structured in nearby matched mature populations. Genetic structure was less evident in var. immuginata populations. Aggregated genotypes were only apparent in the population where patches included juveniles of similar ages; dense juvenile clumps in the other two var. immuginata populations comprised a variety of ages. Interannual variability in allele frequencies of surviving seedlings may account for the absence of genetic structure in these populations. Keywords: disturbance history, gene dispersal, genetic structure, Pinus clausa, spatial auto- correlation. Introduction habitat selection, which may foster ®ne-scale genetic dierentiation within populations. With wind-pollinated Fine-scale genetic structure is evident within populations and wind-dispersed species, however, gene dispersal when the distribution of genetic variation among indi- generally decreases with increasing interplant distance; viduals grouped at increasing spatial scales is nonran- and spatial structure may result from genetic drift dom (McCauley, 1997). A number of evolutionary and associated with limited gene ¯ow over greater distances ecological processes aect the development of genetic (Wright, 1943; Heywood, 1991). These neighbourhoods structure within plant populations, including pollen and may become ecologically adapted to their microhabitat seed dispersal (Wright, 1943; Latta et al., 1998), micro- through selection, reinforcing genetic structure (Berg & habitat variation in selection (Linhart et al., 1981; Hamrick, 1995). Although various temperate tree species Epperson & Allard, 1989; Slatkin & Arter, 1991), adult have been studied to determine whether genetic struc- population density (Hamrick & Nason, 1996), spatial ture is evident within populations of wind-pollinated and temporal patterns of seedling establishment and -dispersed species, most have found either no (Ellstrand, 1992; Schnabel & Hamrick, 1995; Hamrick detectable pattern (e.g. Pinus contorta: Epperson & Allard, & Nason, 1996), and stand age and history (Knowles 1989; P. banksiana: Xie & Knowles, 1991) or only weak et al., 1992; Hamrick et al., 1993; Schnabel et al., 1998). genetic structure, typically at small interplant distances Probably the most widely examined in¯uence on ®ne- (e.g. Acer saccharum: Perry & Knowles, 1991; Picea abies: scale genetic structure has been gene movement, inclu- Leonardi et al., 1996; Quercus laevis: Berg & Hamrick, ding both pollen and seed dispersal. Extensive gene 1995; Fagus sylvatica: Leonardi & Menozzi, 1996). movement theoretically osets the in¯uence of micro- Other factors that aect ®ne-scale genetic structure have been examined less thoroughly than gene move- *Correspondence. E-mail: [email protected] ment. Boyle et al. (1990) and Knowles et al. (1992) Ó 2001 The Genetics Society of Great Britain. 99 100 K. C. PARKER ET AL. found dierences in the development of genetic structure temporal dispersal of seeds would hypothetically cause within populations of Larix laricina and Picea mariana, var. immuginata populations to show more ®ne-scale respectively, which they attributed to dierences in genetic structure than var. clausa populations. stand history. Sites that were colonized from a homo- geneous outside seed source that included few seed trees Methods showed little evidence of genetic structure, whereas colonization of a large disturbed site by seeds from Species biology and study sites many founder trees (Knowles et al., 1992) or continuous recruitment through gap-phase dynamics (Boyle et al., Pinus clausa is virtually endemic to Florida, where it 1990) led to more genetic structure within the popula- inhabits xeric, low-nutrient Quaternary and modern tions studied. Boyle et al. (1990) were reluctant to dunes and beach ridges along the coast and in the central generalize about the eects of disturbance on genetic part of the peninsula (Fig. 1). It is the canopy dominant of structure, however, noting that the distribution of the scrub ecosystem that occurs on these sites (Myers, genetic variation within a repopulated site after distur- 1990). The initial dierentiation between the two varieties bance re¯ects various factors, including size of the area was based on their disjunct distribution and purported disturbed, extent of mortality, proximity of potential dierences in cone serotiny. Natural populations of seed trees, seed production at the time of disturbance, P. clausa var. clausa are restricted to the peninsula, where and climatic conditions following seed dispersal. the majority of individuals bear serotinous cones (Little & This study examines the eect of disturbance history Dorman, 1952). The importance of stand-initiating can- on the development of genetic structure in two varieties opy ®res occurring every 30±60 years is well established in of Pinus clausa (Chapm. ex Engelm.) Vasey ex Sarg. var. clausa (Myers, 1990), and most mature peninsula (sand pine) in Florida. P. clausa is ideal for such analyses populations are unimodal in their age distributions, because the two varieties dier in their prevalent dating either from the last intense ®re or, in some cases, disturbance regimes. P. clausa var. clausa (Ocala sand agricultural abandonment (Parker et al., 2001). Regen- pine) bears serotinous cones throughout most of its eration is rare in these older populations in the absence of range in the Florida peninsula; populations are often canopy ®re (Parker et al., 1997a). In contrast, P. clausa strongly even-aged, with the dominant age re¯ecting the var. immuginata occurs on the Florida panhandle and time since the last stand-destroying ®re (Myers, 1990; typically bears open cones. Although spot ®res and Parker et al., 2001). In most locations within its range occasional stand-initiating ®res occur in this variety, in the Florida panhandle, P. clausa var. immuginata D.B. disturbances are typically smaller in scale and are asso- Ward (Choctawhatchee sand pine) has open cones. ciated with hurricanes and extra-tropical cyclones more Stands are more uneven-aged, with recruitment occur- often than with ®re (Parker et al., 2001). Recruitment is ring continuously in small gaps in the forest that are ongoing in these populations; consequently most var. opened by small-scale disturbances, such as wind immuginata populations are uneven-aged (Cooper et al., damage associated with hurricanes (Parker et al., 1959; Parker et al., 2001), with regeneration occurring in 2001). Speci®c questions addressed include: (i) Within gaps created by frequent localized wind damage. each of nine Pinus clausa populations, do closely spaced Since the original description of the two varieties of individuals show more relatedness in terms of their Pinus clausa, genetic analyses and common garden, or allozyme genotypes than more distantly spaced individ- provenance, studies have revealed other contrasts uals?; (ii) Do dierent age groups within each population between the two varieties. Var. clausa consistently pro- show dierent patterns of ®ne-scale genetic structure and duces seeds on an annual basis, whereas var. immuginata inbreeding?; (iii) Are dierences among populations in masts on a 4±6-year cycle (Outcalt & Balmer, 1983). Seeds spatial genetic structure related to adult or seedling are larger in var. clausa (0.00961 g seed±1) than in var. density dierences?; and (iv) Do the two varieties of immuginata (0.00808 g seed±1), and although seeds can P. clausa dier in the strength of genetic structure that be held in closed var. clausa cones for a number of years, has developed within populations and, if so, can these germination rates decline from 93% for fresh seed to contrasts be related to dierences in disturbance history? <49% for seed >1-year-old (Barnett & McLemore, The initial hypothesis was that populations of var. clausa 1965). Individual longevity tends to be greater in var. would typically regenerate in a narrow window of time immuginata (Parker et al., 2001); this variety is more after disturbance from a relatively homogeneous seed resistant to several species of root rot (Outcalt & Balmer, supply; in contrast, var. immuginata would experience 1983). Despite the maintenance by each variety of a high continuous recruitment in small gaps over time,
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