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Fire promotes pollinators

In ecosystems with a dens vegetation, wildfires open the canopy and create an environment with more light and less competition. In such postfire conditions there is an increase in flowers, and thus, flower visitors are also likely to increase. In a recent article [1] we performed a meta-analysis to specifically evaluate the effect of fire (prescribed and wildfires) on pollinators from 65 studies in 21 countries across de globe. The overall effect of fire on abundance and richness of pollinators across all studies was positive. The positive effect was especially clear after wildfires and for the abundance and diversity of Hymenoptera (bees, wasps, etc.; the main group of pollinators), while Lepidoptera (butterflies and moths) abundance showed a negative response. Short fire intervals also showed a negative effect on pollinators. In conclusion, pollinators are not only resilient to fire, but they tend to be promoted during the first postfire years. That is, fires by increasing the number of flowers, they also increase the number of flower visitors. It is also likely that this may have a positive cascading effects on other interacting species, like seed dispersers and predators. This is one of the mechanisms by which wildfires increase diversity. Pollinations is also one of the ecosystem services that fires can provide to humans [2].

 

 

Figure:  Weighted-mean effect sizes and 95% bias-corrected confidence intervals on abundance (closed circles) and richness (open circles) of pollinator taxa. This is for wildfire only. Sample sizes for each category are shown on the right of each effect. From [1].

References

[1] Carbone L.M., Tavella J., Pausas J.G., Aguilar R. 2019. A global synthesis of fire effects on pollinators. Global Ecology & Biogeography. [doi | pdf]

[2] Pausas J.G. & Keeley J.E. 2019. Wildfires as an ecosystem service. Frontiers in Ecology and Environment 17: 289-295. [doi | pdf | post]

 

  1. July 3rd, 2019 at 12:41 | #1

    Muy interesante!

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