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  Large-scale wind disturbances promote tree diversity in a Central Amazon Forest

Marra, D. M., Chambers, J. Q., Higuchi, N., Trumbore, S. E., Ribeiro, G. H. P. M., Santos, J. d., et al. (2014). Large-scale wind disturbances promote tree diversity in a Central Amazon Forest. PLoS One, 9(8): e103711. doi:10.1371/journal.pone.0103711.

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http://dx.doi.org/10.1371/journal.pone.0103711 (Publisher version)
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 Creators:
Marra, Daniel M.1, 2, Author              
Chambers, Jeffrey Q., Author
Higuchi, Niro, Author
Trumbore, Susan E.1, Author              
Ribeiro, Gabriel H. P. M., Author
Santos, Joaquim dos, Author
Negrón-Juárez, Robinson I., Author
Reu, Björn, Author
Wirth, Christian3, Author              
Affiliations:
1Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497752              
2IMPRS International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry , Max Planck Society, Hans-Knöll-Str. 10, 07745 Jena, DE, ou_1497757              
3Interdepartmental Max Planck Fellow Group Functional Biogeography, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1938314              

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 Abstract: Canopy gaps created by wind-throw events, or blowdowns, create a complex mosaic of forest patches varying in disturbance intensity and recovery in the Central Amazon. Using field and remote sensing data, we investigated the shortterm (four-year) effects of large (.2000 m2) blowdown gaps created during a single storm event in January 2005 near Manaus, Brazil, to study (i) how forest structure and composition vary with disturbance gradients and (ii) whether tree diversity is promoted by niche differentiation related to wind-throw events at the landscape scale. In the forest area affected by the blowdown, tree mortality ranged from 0 to 70%, and was highest on plateaus and slopes. Less impacted areas in the region affected by the blowdown had overlapping characteristics with a nearby unaffected forest in tree density (583646 trees ha21) (mean699% Confidence Interval) and basal area (26.762.4 m2 ha21). Highly impacted areas had tree density and basal area as low as 120 trees ha21 and 14.9 m2 ha21, respectively. In general, these structural measures correlated negatively with an index of tree mortality intensity derived from satellite imagery. Four years after the blowdown event, differences in size-distribution, fraction of resprouters, floristic composition and species diversity still correlated with disturbance measures such as tree mortality and gap size. Our results suggest that the gradients of wind disturbance intensity encompassed in large blowdown gaps (.2000 m2) promote tree diversity. Specialists for particular disturbance intensities existed along the entire gradient. The existence of species or genera taking an intermediate position between undisturbed and gap specialists led to a peak of rarefied richness and diversity at intermediate disturbance levels. A diverse set of species differing widely in requirements and recruitment strategies forms the initial post-disturbance cohort, thus lending a high resilience towards wind disturbances at the community level.

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 Dates: 2014-07-062014-08-062014
 Publication Status: Published in print
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 Identifiers: Other: BGC2088
DOI: 10.1371/journal.pone.0103711
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Title: PLoS One
Source Genre: Journal
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Publ. Info: San Francisco, CA : Public Library of Science
Pages: - Volume / Issue: 9 (8) Sequence Number: e103711 Start / End Page: - Identifier: ISSN: 1932-6203
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000277850