Functional Redundancy in bird community decreases with riparian forest width reduction

Lucas A. Maure; Rodolpho C. Rodrigues; Ângelo V. Alcântara; Bruno F. C. B. Adorno; Douglas L. Santos; Eduardo L. Abreu; Rafael M. Tanaka; Rute M. Gonçalves; Erica Hasui

doi:10.1002/ece3.4448

journal article Open Access Oct 11, 2018

Functional Redundancy in bird community decreases with riparian forest width reduction

Rodolpho C. Rodrigues Ângelo V. Alcântara Bruno F. C. B. Adorno Douglas L. Santos Eduardo L. Abreu Rafael M. Tanaka Rute M. Gonçalves Erica Hasui

Ecology and Evolution Vol. 8 No. 21 pp. 10395-10408 · Wiley

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Abstract

AbstractRiparian ecosystems are suffering anthropogenic threats that reduce biodiversity and undermine ecosystem services. However, there is a great deal of uncertainty about the way species composition of assemblages is related to ecosystem function, especially in a landscape fragmentation context.Here, we assess the impact of habitat loss and disturbance on Functional Diversity (FD) components Functional Redundancy (FRed), Functional Evenness (FEve), and Functional Richness (FRic) of riparian forest bird assemblages to evaluate (a) howFDcomponents respond to riparian forest width reduction and vegetation disturbance; (b) the existence of thresholds within these relationships; (c) which of the main birds diet guild (frugivores, insectivores, and omnivores) respond to such thresholds. We predict thatFDcomponents will be affected negatively and nonlinearly by riparian changes. However, guilds could have different responses due to differences of species sensitivity to fragmentation and disturbance. We expect to find thresholds inFDresponses, because fragmentation and disturbance drive loss of specificFDcomponents.Our results show thatFRed andFEve were linearly affected by width and disturbance of riparian habitats, respectively.FRed was significantly lower in riparian forests assemblages below 400 m wide, andFEve was significantly higher above 60% disturbance. These responses ofFDwere also followed to the decline in insectivores and frugivores richness in riparian forests most affected by these changes.Consequently, our study suggests communities do not tolerate reduction in riparian forest width or disturbance intensification without negative impact onFD, and this becomes more critical for riparian area <400‐m wide or with more than 60% disturbance. This minimum riparian width required to maintainFRed is greater than the minimum width required for riparian forests by Brazilian law. Thus, it is important to consider mechanisms to expand riparian habitats and reduce the disturbance intensity in riparian forests so that riparian bird communityFDmay be effectively conserved.

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Published: Oct 11, 2018
Vol/Issue: 8(21)
Pages: 10395-10408
License: View

Authors

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Lucas A. Maure