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Phylogenetic diversity of Amazonian tree communities

Eurídice N. Honorio Coronado 1 Kyle G. Dexter 2 R. Toby Pennington 3 Jérôme Chave 4 Simon L. Lewis 1 Miguel N. Alexiades 5 Esteban Alvarez Atila Alves de Oliveira 6 Iêda L. Amaral 7 Alejandro Araujo-Murakami 8, 9 Eric J. M. M. Arets 10 Gerardo A. Aymard 11 Christopher Baraloto 12 Damien Bonal 13 Roel Brienen 1 Carlos Cerón 14 Fernando Cornejo Valverde 15 Anthony Di Fiore 16 William Farfan-Rios Ted R. Feldpausch 1 Niro Higuchi 6 Isau Huamantupa-Chuquimaco 17 Susan G. Laurance 18 William F. Laurance 18 Gabriela López-Gonzalez 1 Beatriz S. Marimon 19 Ben Hur Marimon-Junior 20 Abel Monteagudo Mendoza 21 David Neill 22 Walter Palacios Cuenca Maria Cristina Peñuela Mora Nigel C. A. Pitman 23 Adriana Prieto 24 Carlos A. Quesada 6 Hirma Ramirez Angulo 25 Agustín Rudas 24 Ademir R. Ruschel 26 Norma Salinas Revilla Rafael P. Salomão 27 Ana Segalin de Andrade Miles R. Silman Wilson Spironello 7 Hans ter Steege 28, 29 John Terborgh Marisol Toledo 8, 30 Luis Valenzuela Gamarra Ima C. G. Vieira 31 Emilio Vilanova Torre Vincent Vos Oliver L. Phillips 1 Matthew C. Fitzpatrick 
Abstract : Aim To examine variation in the phylogenetic diversity (PD) of tree communities across geographical and environmental gradients in Amazonia. Location Two hundred and eighty-three c.1ha forest inventory plots from across Amazonia. Methods We evaluated PD as the total phylogenetic branch length across species in each plot (PDss), the mean pairwise phylogenetic distance between species (MPD), the mean nearest taxon distance (MNTD) and their equivalents standardized for species richness (ses.PDss, ses.MPD, ses.MNTD). We compared PD of tree communities growing (1) on substrates of varying geological age; and (2) in environments with varying ecophysiological barriers to growth and survival. Results PDss is strongly positively correlated with species richness (SR), whereas MNTD has a negative correlation. Communities on geologically young- and intermediate-aged substrates (western and central Amazonia respectively) have the highest SR, and therefore the highest PDss and the lowest MNTD. We find that the youngest and oldest substrates (the latter on the Brazilian and Guiana Shields) have the highest ses.PDss and ses.MNTD. MPD and ses.MPD are strongly correlated with how evenly taxa are distributed among the three principal angiosperm clades and are both highest in western Amazonia. Meanwhile, seasonally dry tropical forest (SDTF) and forests on white sands have low PD, as evaluated by any metric. Main conclusions High ses.PDss and ses.MNTD reflect greater lineage diversity in communities. We suggest that high ses.PDss and ses.MNTD in western Amazonia results from its favourable, easy-to-colonize environment, whereas high values in the Brazilian and Guianan Shields may be due to accumulation of lineages over a longer period of time. White-sand forests and SDTF are dominated by close relatives from fewer lineages, perhaps reflecting ecophysiological barriers that are difficult to surmount evolutionarily. Because MPD and ses.MPD do not reflect lineage diversity per se, we suggest that PDss, ses.PDss and ses.MNTD may be the most useful diversity metrics for setting large-scale conservation priorities.
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Eurídice N. Honorio Coronado, Kyle G. Dexter, R. Toby Pennington, Jérôme Chave, Simon L. Lewis, et al.. Phylogenetic diversity of Amazonian tree communities. Diversity and Distributions, 2015, 21 (11), pp.1295 - 1307. ⟨10.1111/ddi.12357⟩. ⟨hal-01557462⟩



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