| 研究課題/領域番号 |
25440236
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| 研究機関 | 京都大学 |
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研究代表者 |
デビッド ヒル 京都大学, 野生動物研究センター, 教授 (90594250)
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| 研究期間 (年度) |
2013-04-01 – 2016-03-31
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| キーワード | social system / forest bats / vocal communication / Murina ussuriensis / roosting behaviour / dietary composition / regional variation / playback experiment |
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| 研究実績の概要 |
- A paper based on the results of DNA analysis of population dynamics of M. ussuriensis in Yakushima and Hokkaido was submitted to Journal of Mammalogy. It has been revised according to reviewers’ comments and is currently under review.
- Vocal communication was recorded at maternity roosts located in Yakushima and Ashiu Research Forest by radio-tracking females caught using the lures and behaviour of mothers was observed using a thermal imaging camera.
- The first stage of acoustic analysis was completed with the measurement of key parameters and compilation of a database of all recorded social calls of adequate quality.
- Results of DNA analysis of faecal pellets of M. ussuriensis from Yakushima, Ashiu (Kyoto-fu) and Hokkaido, showed that they contained over 800 taxa of arthropod, indicating an extremely varied diet. The ability of this species to inhabit a great variety of forest types may result from its generalist diet.
- The acoustic lure was tested during two field trips to Australia and was shown to increase capture rates for some bat species. A paper was published in Australian Mammalogist based on the results. We also made a preliminary investigation of vocal communication in three species of Nyctophilus that were found to give frequent social calls.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
Progress with analysis of population genetic data and of faecal DNA to determine diet was good, but slower than anticipated. A paper on population genetics will hopefully be published within the next year and we plan to submit a paper on diet for publication during the same period. However, playback experiments to assess behavioural responses in relation to call characteristics were only partially successful due to relatively low response rates in Yakushima. Much higher response rates were obtained at Ashiu Research Forest, but it was not feasible to work there for extended periods because the RA and most research equipment were based in Yakushima. Consequently, more emphasis was given to 1) locating maternity roosts and recording vocal behaviour of bats around them and 2) assessing responsiveness of closely related, and ecomorphologically similar species at other sites in Australia and Malaysia. The latter work was very successful and formed the basis of one published paper, one newsletter article and presentations at three international conferences.
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| 今後の研究の推進方策 |
Work in the coming year will focus on two things: completing analysis and publication of existing data from the project and collecting further comparative data on responses of closely related species of bat to the acoustic lure. Data on acoustic parameters will be used to classify communicative vocalisations into different call types using PCA, or a similar statistical approach, and sequences of call types. Analysis will then determine whether call types and sequences of calls varied in relation to season, time of night or context (at or away from the roost). Data from DNA analysis of faecal pellets will be used to examine the extent to which the diet of M. ussuriensis varied with region, sex and season. Additional fieldwork will be conducted in Malaysia (and possibly Okinawa) to assess the extent to which other species of the genus Murina respond vocally and behaviourally to the output of the acoustic lure, and whether those responses are restrictes to simulated calls of their own species, or whether there are general features of social calls that are common across different species o the genus.
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