Habitat fragmentation drives inter-population variation in dispersal behavior in a Neotropical rainforest bird

Cornelius, Cíntia; Awade, Marcelo; Candia‐Gallardo, Carlos; Sieving, Kathryn E.; Metzger, Jean Paul

doi:10.1016/j.pecon.2017.02.002

Cited by 42 publications

(54 citation statements)

References 45 publications

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“…; Cornelius et al . ). Therefore, small fragments may act as ‘stepping‐stones’ favouring the movement of bird and plant partners contributing to propagate the distinct subset of interactions that functionally integrate fragments in the metanetwork context (Uezu et al .…”

Section: Discussionmentioning

confidence: 97%

“…Combining new technologies such as radio tracking (Nathan ; Cornelius et al . ) and DNA barcoding (Carvalho et al . ; Gonzalez‐Varo et al .…”

Section: Discussionmentioning

confidence: 99%

“…; Cornelius et al . ). Large‐bodied frugivore species, expected to provide more effective medium‐ to long‐distance seed‐dispersal (Jordano et al .…”

Section: Introductionmentioning

confidence: 97%

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Seed‐dispersal interactions in fragmented landscapes – a metanetwork approach

et al. 2018

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Mutualistic interactions repeatedly preserved across fragmented landscapes can scale-up to form a spatial metanetwork describing the distribution of interactions across patches. We explored the structure of a bird seed-dispersal (BSD) metanetwork in 16 Neotropical forest fragments to test whether a distinct subset of BSD-interactions may mediate landscape functional connectivity. The metanetwork is interaction-rich, modular and poorly connected, showing high beta-diversity and turnover of species and interactions. Interactions involving large-sized species were lost in fragments< 10 000 ha, indicating a strong filtering by habitat fragmentation on the functional diversity of BSD-interactions. Persistent interactions were performed by small-seeded, fast growing plant species and by generalist, small-bodied bird species able to cross the fragmented landscape. This reduced subset of interactions forms the metanetwork components persisting to defaunation and fragmentation, and may generate long-term deficits of carbon storage while delaying forest regeneration at the landscape level.

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Section: Discussionmentioning

confidence: 97%

“…Combining new technologies such as radio tracking (Nathan ; Cornelius et al . ) and DNA barcoding (Carvalho et al . ; Gonzalez‐Varo et al .…”

Section: Discussionmentioning

confidence: 99%

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Seed‐dispersal interactions in fragmented landscapes – a metanetwork approach

et al. 2018

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“…On the other hand, cattle pastures present a highly contrasting edge, which may discourage the movement of birds from forest to pastures. In addition to the barrier effect associated with their physical structure (Macfadyen & Muller, ; Ries, Fletcher, Battin, & Sisk, ), pasture habitats may present a higher risk of predation for forest‐dependent species (Awade, Candia‐Gallardo, Cornelius, & Metzger, ; Biz, Cornelius, & Metzger, ; Cornelius, Awade, Cândia‐Gallardo, Sieving, & Metzger, ). Translocation experiments using a forest‐dependent species (White‐shouldered Fire‐eye Pyriglena leucoptera ) in Atlantic forest landscapes demonstrated higher predation risk in pastures relative to eucalyptus or corn plantations, and that this risk was linked to both higher predator density and higher exposure to predators (Biz et al., ).…”

Section: Discussionmentioning

confidence: 99%

Land use type, forest cover and forest edges modulate avian cross‐habitat spillover

Boesing

Nichols

Metzger

2017

Journal of Applied Ecology

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Natural habitats adjacent to agricultural areas are often considered sources of species that provide beneficial regulating ecosystem services through cross‐habitat spillover. Both inter‐habitat matrix and landscape configuration can influence spillover by controlling organismal ability to disperse through landscapes, and affecting the provision of additional or supplementary resources that impact organism survival. To understand how landscape structure in terms of matrix land use type, forest cover and edge density might facilitate avian cross‐habitat spillover, we sampled avian communities in forest patches and adjacent land use types (coffee plantations or cattle pastures) using a well‐replicated study design across 92 sampling sites across a landscape‐context forest cover gradient (6%–60%). Land use type was a key factor influencing avian cross‐habitat spillover, facilitating species movement into coffee plantations and acting as a barrier to spillover into cattle pastures. We found that 24% of the forest‐dependent species pool was capable of spillover into coffee plantations, while spillover was nearly non‐existent in cattle pastures. Forest cover was also the main driver of spillover into coffee plantations. There was a positive relationship between forest cover and spillover, potentially due to processes related with (1) a higher density of organism in‐patches, (2) decreased isolation among patches facilitating species movement and (3) higher landscape supplementation processes. Finally, we found edge density had an additive effect with forest cover on spillover. Spillover was higher in high‐forested landscapes with many forest‐matrix edges, possibly due to increased structural connectivity for species able to move through edges, and to improved access for forest‐dwelling species to different resource types (complementation processes). Synthesis and applications. We demonstrate that land use type is a key factor facilitating species spillover into agricultural matrices and that the influence of land use type on spillover is further modulated by a combination of native habitat amount and edge density. These results should be considered in efforts to design or manage sustainable agricultural landscapes in order to enhance both bird persistence and the provision of bird‐mediated ecosystem services.

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“…The location of these thresholds depends both on the abilities of species to move throughout the landscapes (Püttker et al 2011), and on characteristics of the landscape, such as the number, size and isolation of remaining patches (Villard and Metzger 2014), both influencing the functional connectivity among habitat remnants (Belisle 2005, Cornelius et al 2017. Particularly, the quality of non-native habitats (matrix) that surround native habitat patches may have significant impact on maintaining functional connectivity through its effects on organismal movement and dispersal between native patches (Driscoll et al 2013, Prevedello et al 2016, Biz et al 2017, by altering the availability of supplementary or complementary resources at the landscape-scale (Dunning et al 1992), and by influencing abiotic edge conditions of native patches (Saunders et al 1991).…”

Section: Introductionmentioning

confidence: 99%

Biodiversity extinction thresholds are modulated by matrix type

Boesing¹,

Nichols

Metzger³

2018

Ecography

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106

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Biodiversity extinction thresholds are abrupt declines in biological diversity that occur with habitat loss, associated with a decline in habitat connectivity. Matrix quality should influence the location of thresholds along habitat loss gradients through its effects on connectivity; however these relationships have seldom been explored empirically. Using field data from 23 independent 1254 ha landscapes in the Brazilian Atlantic Forest, we evaluated how tropical avian biodiversity responds to native forest loss within habitat patches embedded either in homogeneous pasture matrix context (with a high proportion of cattle pastures), and heterogeneous coffee matrix context (with high abundance of sun coffee plantations). We considered taxonomic, functional, and phylogenetic diversity, and tested if matrix type and choice of diversity metric influenced the location of biodiversity thresholds along the forest cover gradient. We found that matrix type postponed the abrupt loss of taxonomic diversity, from a threshold of 35% of forest cover in homogeneous pasture matrix to 19% in heterogeneous coffee matrix. Phylogenetic diversity responded similarly, with thresholds at 30 and 24% in homogeneous‐pasture and heterogeneous‐coffee matrices, respectively, but no relationship with forest cover was detected when corrected for richness correlation. Despite the absence of a threshold for functional diversity in either matrix types, a strong decline below 20% of habitat amount was detected. Finally, below 20% native habitat loss, all diversity indices demonstrated abrupt declines, indicating that even higher‐quality matrices cannot postpone diversity loss below this critical threshold. These results highlight that taxonomic diversity is a more sensitive index of biodiversity loss in fragmented landscapes, which may be used as a benchmark to prevent subsequent functional and phylogenetic losses. Furthermore, increasing matrix quality appears an efficient conservation strategy to maintain higher biodiversity levels in fragmented landscapes over a larger range of habitat loss.

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Habitat fragmentation drives inter-population variation in dispersal behavior in a Neotropical rainforest bird

Abstract: 2017-08-25T16:28:22

Cited by 42 publications

References 45 publications

Seed‐dispersal interactions in fragmented landscapes – a metanetwork approach

Seed‐dispersal interactions in fragmented landscapes – a metanetwork approach

Land use type, forest cover and forest edges modulate avian cross‐habitat spillover

Biodiversity extinction thresholds are modulated by matrix type

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