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Nicheâ based processes outperform neutral processes when predicting distance decay in coâ dominance along the Amazon â Andes rainforest gradient
dc.contributor.authorTrujillo, Ledy N.
dc.contributor.authorGranzow‐de La Cerda, Íñigo
dc.contributor.authorPardo, Iker
dc.contributor.authorMacía, Manuel J.
dc.contributor.authorCala, Victoria
dc.contributor.authorArellano, Gabriel
dc.date.accessioned2019-07-03T19:56:24Z
dc.date.availableWITHHELD_13_MONTHS
dc.date.available2019-07-03T19:56:24Z
dc.date.issued2019-07
dc.identifier.citationTrujillo, Ledy N.; Granzow‐de La Cerda, Íñigo ; Pardo, Iker; Macía, Manuel J. ; Cala, Victoria; Arellano, Gabriel (2019). "Nicheâ based processes outperform neutral processes when predicting distance decay in coâ dominance along the Amazon â Andes rainforest gradient." Journal of Vegetation Science (4): 644-653.
dc.identifier.issn1100-9233
dc.identifier.issn1654-1103
dc.identifier.urihttps://hdl.handle.net/2027.42/149700
dc.description.abstractQuestionDispersal limitation (neutral hypothesis) and deterministic factors (niche hypothesis) shape floristic gradients including betweenâ site patterns of speciesâ dominance (coâ dominance). Because their relative importance remains poorly known, we ask how their comparative contribution to coâ dominance changes with elevation and geographical extent.LocationMadidi region, NW Bolivia.MethodsWe analysed floristic composition and environmental factors of 90 plots spanning the gradient from Amazonian (<1,000 m) to montane forests at three elevations (1,200â 1,500; 2,000â 2,300; and 2,800â 3,200 m) and two geographical extents: local (plots <12 km apart) and regional (38â 120 km apart). We modelled distance decay within each elevational band with a neutral model, using two parameters (speciation rate and dispersal distance). Subsequently, we related the model’s residuals to environmental differences using flexible machine learning models.ResultsWe found that 5â 44% of the variability in floristic differences along the gradient studied can be explained by a neutral model of distance decay, while 18â 50% can be explained by environmental differences. Montane forests showed an overall gradient in floristic composition that is congruent with an increase in elevation for both dispersal limitation and environmental filtering. However, Amazonian forest was more nicheâ structured and more dispersalâ limited relative to its elevation and topography.ConclusionsEnvironmental differences explained floristic differences better than the neutral model, even giving preferential attribution to the more parsimonious neutral processes.We analysed 90 tree communities spanning the longest forested elevational gradient on Earth: the extraordinarily diverse Amazonian and Andean forests of the Madidi region (Bolivia). Dominant species vary more with greater barriers to dispersal and stronger environmental changes, increasingly so at higher elevations. Amazonian dominant species, however, change more than expected at their elevation and topography.
dc.publisherPrinceton University Press
dc.publisherWiley Periodicals, Inc.
dc.subject.otherneutral theory
dc.subject.otherniche partitioning
dc.subject.otheroligarchy hypothesis
dc.subject.otherspecies coâ dominance
dc.subject.otherAndes
dc.subject.othertropical montane forests
dc.subject.otherAmazon
dc.subject.otherspecies turnover
dc.subject.otherBolivia
dc.subject.otherenvironmental determinism
dc.subject.otherMadidi
dc.titleNicheâ based processes outperform neutral processes when predicting distance decay in coâ dominance along the Amazon â Andes rainforest gradient
dc.typeArticle
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelNatural Resources and Environment
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/149700/1/jvs12761-sup-0003-AppendixS3.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/149700/2/jvs12761-sup-0001-AppendixS1.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/149700/3/jvs12761.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/149700/4/jvs12761_am.pdf
dc.identifier.doi10.1111/jvs.12761
dc.identifier.sourceJournal of Vegetation Science
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