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Article Dans Une Revue Proceedings of the Royal Society B: Biological Sciences Année : 2023

When origin, reproduction ability, and diet define the role of birds in invasions

Clara Marino
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Céline Bellard

Résumé

Introduced alien species can severely impact native biodiversity. While these impacts are well documented in the literature, they are usually studied through the lens of either the invasive alien species (IAS) or the native species that suffer from them but not both. A clear understanding of how both protagonists of biological invasions are characterized according to their impact is still lacking. Here, we analyzed the ecological strategies of 850 alien birds and IAS-threatened native birds. Using traits related to species morphology, life history, and ecology, we distinguished functional groups of birds based on their role in biological invasions. We then evaluated the functional characterization of these groups according to two impact magnitudes (high and low impact) and three invasion mechanisms (habitat effect, direct species effect, and indirect species effect). We found that alien birds and IASthreatened native birds were functionally distinct: the former had mainland populations, deeper beaks, and larger clutches, while the latter were more insular endemic species with an insessorial foraging niche and animal-based diet. Impact magnitude was further correlated to generalist behavior for alien birds and insular endemism for IAS-threatened birds. By contrast, the impact mechanism was poorly explained by traits, except for native birds threatened by a direct species effect (e.g., predation), which were more insular endemic, larger, and with a longer beak than birds threatened by a habitat effect. By conjointly addressing the functional aspects of threatened and threatening diversity, this paper provides a new perspective on the global consequences of biological invasions.
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Dates et versions

hal-03563209 , version 1 (09-02-2022)
hal-03563209 , version 2 (29-03-2023)

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Clara Marino, Céline Bellard. When origin, reproduction ability, and diet define the role of birds in invasions. Proceedings of the Royal Society B: Biological Sciences, 2023, 290, pp.20230196. ⟨10.1098/rspb.2023.0196⟩. ⟨hal-03563209v2⟩
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