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'Nucleating' succession in recovering neotropical wet forests: The legacy of remnant trees

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Abstract:

Question: What is the influence of remnant trees on secondary forest structure and composition in tropical pastures many years after abandonment?

Location: Neotropical lowland wet forest, La Selva Biological Station, Costa Rica.

Methods: Tree and sapling density, basal area, and species richness were quantified at three distances from remnant trees, 0 - 10 m (inner), 20 - 30 m (intermediate), and ca. 50 m (distal) zones. A total of 15 remnant trees were sampled in pastures ∼23 years after abandonment.

Results: Tree density decreased along a gradient from inner (1117 ± 377 individuals/ha) to distal (592 ± 282 individuals/ha) zones, and the number of large-seeded individuals (seeds > 1 cm diameter) was significantly greater in the inner zone. Basal area of tree individuals was greater in the inner (25.6 ± 12 m2/ha) and intermediate (28.3 ± 15.6 m2/ha) zones than the distal zone (14.7 ± 7.2 m2/ha), but there were no differences between inner and intermediate zones. Similar patterns are reported for species richness. Additionally, saplings (1 - 5 cm DBH) had higher density directly beneath and adjacent to remnants, suggesting that remnant trees can affect recruitment even many years after pasture abandonment and the formation of a surrounding secondary forest.

Conclusions: Results indicate that remnant trees facilitate forest recovery over a broad temporal range, and appear to 'nucleate' forest regeneration by expanding their sphere of influence outward over time.
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