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  Accounting for detectability improves estimates of species richness in tropical bat surveys

Meyer, C. F. J., Aguiar, L. M. S., Aguirre, L. F., Baumgarten, J., Clarke, F. M., Cosson, J.-F., et al. (2011). Accounting for detectability improves estimates of species richness in tropical bat surveys. Journal of Applied Ecology, 48(3), 777-787. doi:10.1111/j.1365-2664.2011.01976.x.

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 Creators:
Meyer, Christoph F. J., Author
Aguiar, Ludmilla M. S., Author
Aguirre, Luis F., Author
Baumgarten, Julio, Author
Clarke, Frank M., Author
Cosson, Jean-Francois, Author
Villegas, Sergio Estrada, Author
Fahr, Jakob1, Author              
Faria, Deborah, Author
Furey, Neil, Author
Henry, Mickael, Author
Hodgkison, Robert, Author
Jenkins, Richard K. B., Author
Jung, Kirsten G., Author
Kingston, Tigga, Author
Kunz, Thomas H., Author
MacSwiney, Maria Cristina, Author
Moya, Isabel, Author
Patterson, Bruce D., Author
Pons, Jean-Marc, Author
Racey, Paul A., AuthorRex, Katja, AuthorSampaio, Erica M., AuthorSolari, Sergio, AuthorStoner, Kathryn E., AuthorVoigt, C. C., Authorvon Staden, Dietrich, AuthorWeise, Christa D., AuthorKalko, Elisabeth K. V., Author more..
Affiliations:
1Universität Ulm, ou_persistent22              

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 Abstract: 1. Species richness is a state variable of some interest in monitoring programmes but raw species counts are often biased due to imperfect species detectability. Therefore, monitoring programmes should quantify detectability for target taxa to assess whether it varies over temporal or spatial scales. We assessed the potential for tropical bat monitoring programmes to reliably estimate trends in species richness. 2. Using data from 25 bat assemblages from the Old and New World tropics, we estimated detectability for all species in an assemblage (mean proportion of species detected per sampling plot) and for individual species (species-specific detectability). We further assessed how these estimates of detectability were affected by external sources of variation relating to time, space, survey effort and biological traits. 3. The mean proportion of species detected across 96 sampling plots was estimated at 0.76 (range 0.57-1.00) and was significantly greater for phytophagous than for animalivorous species. Species-averaged detectability for phytophagous species was influenced by the number of surveys and season, whereas the number of surveys and sampling methods [ground- or canopy-level mist nets, harp traps and acoustic sampling (AS)] most strongly affected estimates of detectability for animalivorous bats. Species-specific detectability averaged 0.4 and was highly heterogeneous across 232 species, with estimates ranging from 0.03 to 0.84. Species-level detectability was influenced by a range of external factors such as location, season, or sampling method, suggesting that raw species counts may sometimes be strongly biased. 4. Synthesis and applications. Due to generally high species-specific detection probabilities, Neotropical aerial insectivorous bats proved to be well suited for monitoring using AS. However, for species with low detectability, such as most gleaning animalivores or nectarivores, count data obtained in bat monitoring surveys must be corrected for detection bias. Our results indicate that species-averaged detection probabilities will rarely approach 1 unless many surveys are conducted. Consequently, long-term bat monitoring programmes need to adopt an estimation scheme that corrects for variation in detectability when comparing species richness over time and when making regional comparisons. Similar corrections will be needed for other species-rich tropical taxa.

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 Dates: 2011
 Publication Status: Published in print
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Title: Journal of Applied Ecology
Source Genre: Journal
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Publ. Info: Oxford : Blackwell Scientific Publications
Pages: - Volume / Issue: 48 (3) Sequence Number: - Start / End Page: 777 - 787 Identifier: ISSN: 0021-8901
CoNE: https://pure.mpg.de/cone/journals/resource/954925410813