1. Going beyond species richness and abundance: robustness of community specialisation measures in short acoustic surveys
- Author
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Fabien Claireau, Jérémy S. P. Froidevaux, Isabelle Le Viol, Luc Barbaro, Yves Bas, Jean-François Julien, Romain Lorrillière, Fabien Verfaillie, Kévin Barré, Nicolas Dubos, Charlotte Roemer, Christian Kerbiriou, Centre d'Ecologie et des Sciences de la COnservation (CESCO), Muséum national d'Histoire naturelle (MNHN)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Dynamiques et écologie des paysages agriforestiers (DYNAFOR), École nationale supérieure agronomique de Toulouse [ENSAT]-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Muséum national d'Histoire naturelle (MNHN), Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Université Paul-Valéry - Montpellier 3 (UPVM)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and Veolia Environnement (FRANCE)
- Subjects
0106 biological sciences ,Bat activity ,[SDV]Life Sciences [q-bio] ,Biodiversity ,Species of conservation concern ,010603 evolutionary biology ,01 natural sciences ,Ecological indicators ,Community specialisation index ,Abundance (ecology) ,Sampling effort ,Duration (project management) ,Ecology, Evolution, Behavior and Systematics ,Nature and Landscape Conservation ,[SDV.EE]Life Sciences [q-bio]/Ecology, environment ,Ecology ,010604 marine biology & hydrobiology ,Sampling (statistics) ,15. Life on land ,Confidence interval ,Geography ,Habitat ,Metric (unit) ,Physical geography ,Species richness ,Bioacoustics - Abstract
International audience; Passive Acoustic Monitoring offers promising opportunities for biodiversity assessments and species conservation and is still in development. The robustness of community metrics depends on sampling effort and acoustic surveys should be adjusted for cost-effectiveness. Using a large-scale acoustic survey of bat assemblages conducted along 5487 survey nights across France, we assessed the effect of sampling duration on the level of confidence of four community metrics (total bat activity, species of conservation concern activity, species richness, and community specialisation index). We further investigated whether this effect varied across habitats and seasons. Overall, a high level of confidence (i.e., 95% similarity between cumulated survey nights) was reached after 2 to >20 sampling nights, depending on the community metric, the habitat and the season considered. CSI required the lowest sampling duration. A higher sampling duration was required in three-dimensionally structured habitats (e.g., forests) and habitats unfavourable to bats (e.g., intensive farmlands), while a high degree of confidence was reached earlier in more favourable habitats and non-intensive farmlands, and during the season of higher activity. Beyond providing recommendations for the design of context-dependent minimum sampling duration in acoustic surveys, we show that weighted community indices such as the CSI are efficient summary measures, and advocate for their use when monitoring resources are limited.
- Published
- 2021