Potential losses of animal-dispersed trees due to selective logging in Amazonian forest concessions

Carvalho, Elildo A.R.; Hawes, Joseph E.; Haugaasen, Torbjørn

doi:10.1016/j.tfp.2022.100316

Cited by 3 publications

(1 citation statement)

References 82 publications

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“…Rainfall has been negatively associated with the proportion of abiotic dispersal modes (Correa et al, 2015; Massi et al, 2017; Tabarelli et al, 2003), while latitude (Chen et al, 2017; Moles et al, 2007), elevation (Albert et al, 2018; Chapman et al, 2016; Tovar et al, 2020), and hunting intensity (Nunez‐Iturri et al, 2008; Peres et al, 2016; Terborgh et al, 2008; Wright et al, 2007) have been positively associated with their proportion. The ecological explanations of these patterns are still being discussed (Albert et al, 2018; Aldana et al, 2017; Carvalho et al, 2022; Chapman et al, 2016; Chen et al, 2017; Correa et al, 2015; Henneron et al, 2019; Massi et al, 2017; Peres et al, 2016; Tovar et al, 2020; Umaña et al, 2018; Vasconcelos et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Geographic patterns of tree dispersal modes in Amazonia and their ecological correlates

Correa

Stevenson

Umaña

et al. 2022

Global Ecol Biogeogr

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Aim To investigate the geographic patterns and ecological correlates in the geographic distribution of the most common tree dispersal modes in Amazonia (endozoochory, synzoochory, anemochory and hydrochory). We examined if the proportional abundance of these dispersal modes could be explained by the availability of dispersal agents (disperser‐availability hypothesis) and/or the availability of resources for constructing zoochorous fruits (resource‐availability hypothesis). Time period Tree‐inventory plots established between 1934 and 2019. Major taxa studied Trees with a diameter at breast height (DBH) ≥ 9.55 cm. Location Amazonia, here defined as the lowland rain forests of the Amazon River basin and the Guiana Shield. Methods We assigned dispersal modes to a total of 5433 species and morphospecies within 1877 tree‐inventory plots across terra‐firme, seasonally flooded, and permanently flooded forests. We investigated geographic patterns in the proportional abundance of dispersal modes. We performed an abundance‐weighted mean pairwise distance (MPD) test and fit generalized linear models (GLMs) to explain the geographic distribution of dispersal modes. Results Anemochory was significantly, positively associated with mean annual wind speed, and hydrochory was significantly higher in flooded forests. Dispersal modes did not consistently show significant associations with the availability of resources for constructing zoochorous fruits. A lower dissimilarity in dispersal modes, resulting from a higher dominance of endozoochory, occurred in terra‐firme forests (excluding podzols) compared to flooded forests. Main conclusions The disperser‐availability hypothesis was well supported for abiotic dispersal modes (anemochory and hydrochory). The availability of resources for constructing zoochorous fruits seems an unlikely explanation for the distribution of dispersal modes in Amazonia. The association between frugivores and the proportional abundance of zoochory requires further research, as tree recruitment not only depends on dispersal vectors but also on conditions that favour or limit seedling recruitment across forest types.

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