Publications by authors named "L Gallien"
AbstractIntransitive competition has received much attention over the past decade. Indeed, these cyclic arrangements of species interactions have the potential to promote and stabilize species coexistence. However, the importance of intransitive interactions in real-world species-rich communities containing a mixture of hierarchic and intransitive interactions remains unknown.
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- Seasonal migration significantly influences animal diversification, particularly in birds, by facilitating the development of sedentary populations that can lead to speciation.
- A study identified at least 157 independent colonization events initiated by migratory birds, underscoring that migratory drop-off can promote speciation, even in recently extinct species.
- The findings suggest that the impact of migration on species richness on islands is greater than that of direct dispersal, with success in speciation also linked to factors like range size and flock size.
Article Synopsis
- - Our study examines the risks posed by 94 invasive species to seven vital ecosystem services in Europe, revealing widespread impacts on areas like outdoor recreation and crop provision.
- - We found that areas with less provision of ecosystem services are more exposed to invasive species, with potential invasion areas projected to increase by 77% in key regions.
- - The research highlights the need to monitor high-value ecosystem service areas, which cover a small part of Europe but are crucial for conservation, aligning management strategies with biodiversity goals.
Dispersal across biogeographic barriers is a key process determining global patterns of biodiversity as it allows lineages to colonize and diversify in new realms. Here we demonstrate that past biogeographic dispersal events often depended on species' traits, by analysing 7,009 tetrapod species in 56 clades. Biogeographic models incorporating body size or life history accrued more statistical support than trait-independent models in 91% of clades.
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- Alien species, introduced by humans outside their native habitats, can negatively impact global biodiversity, leading to the need for standardized assessments like the IUCN EICAT.
- While EICAT focuses on the negative effects, alien species can also have positive impacts, such as providing food or habitat, but there was no established system to measure these benefits.
- To address this, the proposed EICAT+ framework categorizes positive impacts through five scenarios and helps enhance our understanding of biological invasions, aiding in better conservation strategies.