4.7 Article

Assessing the impact of fire on spiders through a global comparative analysis

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ROYAL SOC
DOI: 10.1098/rspb.2023.0089

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Araneae; burn; invertebrate; phylogenetic signal; time since fire; trait-based approach

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Changes in fire regimes due to human activities have an impact on spider populations, with shorter fire intervals posing a threat to certain species. Fire also affects the abundance and composition of spider species in forests compared to other vegetation types. Functional traits may influence how spiders respond to fire, with orb and sheet web weavers being more likely to be absent after fire.
In many regions fire regimes are changing due to anthropogenic factors. Understanding the responses of species to fire can help to develop predictive models and inform fire management decisions. Spiders are a diverse and ubiquitous group and can offer important insights into the impacts of fire on invertebrates and whether these depend on environmental factors, phylogenetic history or functional traits. We conducted phylogenetic comparative analyses of data from studies investigating the impacts of fire on spiders. We investigated whether fire affects spider abundance or presence and whether ecologically relevant traits or site-specific factors influence species' responses to fire. Although difficult to make broad generalizations about the impacts of fire due to variation in site- and fire-specific factors, we find evidence that short fire intervals may be a threat to some spiders, and that fire affects abundance and species compositions in forests relative to other vegetation types. Orb and sheet web weavers were also more likely to be absent after fire than ambush hunters, ground hunters and other hunters suggesting functional traits may affect responses. Finally, we show that analyses of published data can be used to detect broad-scale patterns and provide an alternative to traditional meta-analytical approaches.

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