Circadian long call distribution in wild orangutans
We present first data on circadian long call distribution of wild orangutans in Northwest Borneo. Data were collected during two months in Batang Ai National Park. A total of 151 male long calls were heard, exhibiting a bimodal distribution pattern with peaks at 05:00-06:00 hours and 18:00-19:00 hou...
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Société Francophone de Primatologie
2009-10-01
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| Series: | Revue de Primatologie |
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| Online Access: | https://journals.openedition.org/primatologie/219 |
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| author | Marina Davila Ross Thomas Geissmann |
| author_facet | Marina Davila Ross Thomas Geissmann |
| author_sort | Marina Davila Ross |
| collection | DOAJ |
| description | We present first data on circadian long call distribution of wild orangutans in Northwest Borneo. Data were collected during two months in Batang Ai National Park. A total of 151 male long calls were heard, exhibiting a bimodal distribution pattern with peaks at 05:00-06:00 hours and 18:00-19:00 hours. An earlier study found pronounced differences between the calling rates of Bornean orangutans, which showed an almost unimodal call distribution with its peak at mid-morning, and those of Sumatran orangutans, which showed a bimodal call distribution with a distinct calling peak at predawn and a more moderate peak near dusk (MacKinnon 1974). Our findings from Batang Ai resemble more closely the pattern reported for Sumatra than those reported for other Bornean localities and, therefore, contradict earlier reports suggesting a Sumatra-Borneo dichotomy in orangutan call distribution. In addition, orangutans in Batang Ai were heard to regularly emit long calls throughout the night. This behaviour is unusual for a diurnal species. |
| format | Article |
| id | doaj-art-e4309fa7402344769f8311fa9717b013 |
| institution | Kabale University |
| issn | 2077-3757 |
| language | English |
| publishDate | 2009-10-01 |
| publisher | Société Francophone de Primatologie |
| record_format | Article |
| series | Revue de Primatologie |
| spelling | doaj-art-e4309fa7402344769f8311fa9717b0132025-01-30T10:01:41ZengSociété Francophone de PrimatologieRevue de Primatologie2077-37572009-10-01110.4000/primatologie.219Circadian long call distribution in wild orangutansMarina Davila RossThomas GeissmannWe present first data on circadian long call distribution of wild orangutans in Northwest Borneo. Data were collected during two months in Batang Ai National Park. A total of 151 male long calls were heard, exhibiting a bimodal distribution pattern with peaks at 05:00-06:00 hours and 18:00-19:00 hours. An earlier study found pronounced differences between the calling rates of Bornean orangutans, which showed an almost unimodal call distribution with its peak at mid-morning, and those of Sumatran orangutans, which showed a bimodal call distribution with a distinct calling peak at predawn and a more moderate peak near dusk (MacKinnon 1974). Our findings from Batang Ai resemble more closely the pattern reported for Sumatra than those reported for other Bornean localities and, therefore, contradict earlier reports suggesting a Sumatra-Borneo dichotomy in orangutan call distribution. In addition, orangutans in Batang Ai were heard to regularly emit long calls throughout the night. This behaviour is unusual for a diurnal species.https://journals.openedition.org/primatologie/219orangutansPongo spp.long callcalling timecircadian rhythmsinterspecific competition |
| spellingShingle | Marina Davila Ross Thomas Geissmann Circadian long call distribution in wild orangutans Revue de Primatologie orangutans Pongo spp. long call calling time circadian rhythms interspecific competition |
| title | Circadian long call distribution in wild orangutans |
| title_full | Circadian long call distribution in wild orangutans |
| title_fullStr | Circadian long call distribution in wild orangutans |
| title_full_unstemmed | Circadian long call distribution in wild orangutans |
| title_short | Circadian long call distribution in wild orangutans |
| title_sort | circadian long call distribution in wild orangutans |
| topic | orangutans Pongo spp. long call calling time circadian rhythms interspecific competition |
| url | https://journals.openedition.org/primatologie/219 |
| work_keys_str_mv | AT marinadavilaross circadianlongcalldistributioninwildorangutans AT thomasgeissmann circadianlongcalldistributioninwildorangutans |