Defaunation leads to interaction deficits, not interaction compensation, in an island seed dispersal network

@article{Fricke2018DefaunationLT,
  title={Defaunation leads to interaction deficits, not interaction compensation, in an island seed dispersal network},
  author={Evan C. Fricke and Joshua J Tewksbury and Haldre S. Rogers},
  journal={Global Change Biology},
  year={2018},
  volume={24},
  pages={e190–e200}
}
Following defaunation, the loss of interactions with mutualists such as pollinators or seed dispersers may be compensated through increased interactions with remaining mutualists, ameliorating the negative cascading impacts on biodiversity. Alternatively, remaining mutualists may respond to altered competition by reducing the breadth or intensity of their interactions, exacerbating negative impacts on biodiversity. Despite the importance of these responses for our understanding of the dynamics… Expand
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References

SHOWING 1-10 OF 79 REFERENCES
Mutualistic strategies minimize coextinction in plant–disperser networks
TLDR
Using global databases and field experiments focused on the seed dispersal mutualism, this work found that plants and animals that depend heavily on mutualistic interactions have higher partner diversity and suggests that differences among species in their mutualistic strategy, rather than network structure, primarily accounts for stability in mutualistic communities. Expand
The robustness of pollination networks to the loss of species and interactions: a quantitative approach incorporating pollinator behaviour.
TLDR
Tolerance of generalized networks to species extinctions was high in the random removal scenario, with an increase in network stability if species formed new interactions, however, Anthropogenic disturbance that promote the extinction of the strongest interactors might induce a sudden collapse of pollination networks. Expand
Cascading effects of contemporaneous defaunation on tropical forest communities
TLDR
This review confirms that larger-seeded species consistently experience reduced primary seed dispersal, and increased seedling aggregation around parent trees, as a result of defaunation, and shows consistent shifts toward lower species richness, higher species dominance, and lower diversity. Expand
Effects of an invasive predator cascade to plants via mutualism disruption
TLDR
It is shown that the invasive brown treesnake is also indirectly responsible for a severe decline in plant recruitment as a result of disrupting the fruit-frugivore mutualism on Guam and three nearby islands with intact disperser communities. Expand
Loss of seed dispersal before the loss of seed dispersers
TLDR
It is essential that the understanding of the mechanisms by which seed dispersal is lost is improved, even though the disperser's population remains viable, as there are many unanswered questions that hinder an objective understanding of this threat. Expand
Mutualism Disruption Threatens Global Plant Biodiversity: A Systematic Review
TLDR
There is evidence that mutualism disruption directly threatens significant biodiversity in some geographic regions, and conservation measures with explicit focus on mutualistic functions could be necessary to bolster populations of widowed species and maintain ecosystem functions. Expand
Variation in seed dispersal effectiveness: the redundancy of consequences in diversified tropical frugivore assemblages
TLDR
Evaluating seed dispersal effectiveness for three plant species in a Brazilian Atlantic forest with a marked habitat heterogeneity defined by bamboo and non-bamboo patches highlighted the value of combining observational and experimental field designs to assess functional diversity patterns of tropical frugivore assemblages and delayed effects of their interactions with plants. Expand
Asymmetric Coevolutionary Networks Facilitate Biodiversity Maintenance
TLDR
By using a simple dynamical model, it is shown that asymmetries inherent in coevolutionary networks may enhance long-term coexistence and facilitate biodiversity maintenance. Expand
Tolerance of pollination networks to species extinctions
TLDR
Tolerance in pollination networks contrasts with catastrophic declines reported from standard food webs, and the most–linked pollinators were bumble–bees and some solitary bees, which should receive special attention in efforts to conserve temperate pollination systems. Expand
The architecture of mutualistic networks minimizes competition and increases biodiversity
TLDR
It is shown that nestedness reduces effective interspecific competition and enhances the number of coexisting species, and that a nested network will naturally emerge if new species are more likely to enter the community where they have minimal competitive load. Expand
...
1
2
3
4
5
...