A method for determining relative activity of free flying bats using a new activity index for acoustic monitoring

Publication Type:Journal Article
Year of Publication:2001
Автори:Miller
Journal:Acta ChiropterologicaActa Chiropterologica
Гучність:3
Pagination:93-105
Ключові слова:acoustic activity index, acoustic monitoring, AI, Anabat, bat pass, Chiroptera, echolocation, relative abundance, relative activity
Анотація:

A new activity index for acoustical bat data is presented. The AI acoustical activity index) was highly correlated to bat passes but proved to be a less biased index of activity. The method dispenses with the need to define, identify and count bat passes and provides a simple means to quantify activity. This method uses the Anabat system where acoustic surveys are carried out in real time with the data saved directly to a computer hard drive, taking advantage of the date-time information encoded into each file. The method is based upon the presence absence of a species occurrence during one-minute time intervals and avoids inflating an index of activity that may reflect the behavior of the species sampled. Examples are given showing that the AI is an effective measure of bat activity allowing comparisons between sites, times and species.

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith