Fluctuations of population density in Bornean orangutans (Pongo pygmaeus morio) related to fruit availability in the Danum Valley, Sabah, Malaysia: a 10-year record including two mast fruitings and three other peak fruitings

Kanamori, Tomoko; Kuze, Noko; Bernard, Henry; Malim, Titol Peter; Kohshima, Shiro

doi:10.1007/s10329-016-0584-5

Cited by 32 publications

(20 citation statements)

References 40 publications

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“…For example, food resources and mineral licks are known to influence orangutan densities and distributions (11,34,35), and could similarly affect finer scaled movement decisions. Although emergent tree crowns can be viewed as surrogates for large fruiting trees, such as Ficus and Dracontomelon spp., more direct measures that also account for fruiting phenology will likely be illuminating.…”

Section: Resultsmentioning

confidence: 99%

Canopy structure drives orangutan habitat selection in disturbed Bornean forests

Davies

Ancrenaz

Asner

2017

Proc. Natl. Acad. Sci. U.S.A.

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The conservation of charismatic and functionally important large species is becoming increasingly difficult. Anthropogenic pressures continue to squeeze available habitat and force animals into degraded and disturbed areas. Ensuring the long-term survival of these species requires a well-developed understanding of how animals use these new landscapes to inform conservation and habitat restoration efforts. We combined 3 y of highly detailed visual observations of Bornean orangutans with high-resolution airborne remote sensing (Light Detection and Ranging) to understand orangutan movement in disturbed and fragmented forests of Malaysian Borneo. Structural attributes of the upper forest canopy were the dominant determinant of orangutan movement among all age and sex classes, with orangutans more likely to move in directions of increased canopy closure, tall trees, and uniform height, as well as avoiding canopy gaps and moving toward emergent crowns. In contrast, canopy vertical complexity (canopy layering and shape) did not affect movement. Our results suggest that although orangutans do make use of disturbed forest, they select certain canopy attributes within these forests, indicating that not all disturbed or degraded forest is of equal value for the long-term sustainability of orangutan populations. Although the value of disturbed habitats needs to be recognized in conservation plans for wide-ranging, large-bodied species, minimal ecological requirements within these habitats also need to be understood and considered if long-term population viability is to be realized.Bornean orangutan | Carnegie Airborne Observatory | conservation | Light Detection and Ranging | movement ecology

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Section: Resultsmentioning

confidence: 99%

Canopy structure drives orangutan habitat selection in disturbed Bornean forests

Davies

Ancrenaz

Asner

2017

Proc. Natl. Acad. Sci. U.S.A.

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“…Prior to our study, the most recent large‐scale masting event was in 2010 (Kanamori, Kuze, Bernard, Malim, & Kohshima, ; O'Brien, Philipson, Tay, & Hector, ). Dipterocarp trees produced fruit in our study region (DVCA) in 2014 and as well as elsewhere in Borneo, including West Kalimantan, Indonesia (Knott, 2018, Unpublished Data).…”

Section: Methodsmentioning

confidence: 99%

The influence of logging on vertebrate responses to mast fruiting

Granados

Bernard

Brodie

2019

Journal of Animal Ecology

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Periods of extreme food abundance, such as irregular masting events, can dramatically affect animal populations and communities, but the extent to which anthropogenic disturbances alter animal responses to mast events is not clear. In South‐East Asia, dipterocarp trees reproduce in mast fruiting events every 2–10 years in some of the largest masting events on the planet. These trees, however, are targeted for selective logging, reducing the intensity of fruit production and potentially affecting multiple trophic levels. Moreover, animal responses to resource pulse events have largely been studied in systems where the major mast consumers have been extirpated. We sought to evaluate the influence of human‐induced habitat disturbance on animal responses to masting in a system where key mast consumers remain extant. We used motion‐triggered camera traps to quantify terrestrial mammal and bird occurrences in Sabah, Malaysian Borneo, relative to variation in fruit biomass from 69 plant families during a major (2014) and minor (2015) masting event and a non‐mast year (2013), in both logged and unlogged forests. Bearded pigs (Sus barbatus) showed the clearest responses to masting and occurrence rates were highest in unlogged forest in the year following the major mast, suggesting that the pulse in fruit availability increased immigration or reproduction. We also detected local‐scale spatial tracking of dipterocarp fruits in bearded pigs in unlogged forest, while this was equivocal in other species. In contrast, pigs and other vertebrate taxa in our study showed limited response to spatial or temporal variation in fruit availability in logged forest. Our findings suggest that vertebrates, namely bearded pigs, may respond to masting via movement and increased reproduction, but that these responses may be attenuated by habitat disturbance.

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“…Pongo pygmaeus morio atau orangutan morio merupakan salah satu sub-spesies orangutan yang terdapat di Pulau Kalimantan, khususnya Kalimantan bagian timur dan Sabah, Malaysia (Kanamori et al, 2017;Rayadin & Spehar, 2015). Husson et al (2009) menyebutkan bahwa rute distribusi sub-spesies ini dipengaruhi oleh aliran sungai Mahakam.…”

Section: Pendahuluanunclassified

Karakteristik Vegetasi Habitat Orangutan (Pongo pygmaeus morio) di Hutan Tepi Sungai Menamang, Kalimantan Timur

Sayektiningsih¹,

Ma’ruf²

2017

j. wasian

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ABSTRAKPenelitian dilakukan untuk memperoleh informasi mengenai komponen vegetasi habitat orangutan yang meliputi keanekaragaman jenis, komposisi, dan struktur vegetasi di hutan tepi Sungai Menamang. Pengumpulan data dilakukan dengan metode jalur berpetak. Hasil penelitian menunjukkan bahwa tingkat keanekagaman jenis pohon dan pancang adalah lebih tinggi dibandingkan semai. Pada tingkat pohon, Lagerstroemia speciosa memiliki nilai INP tertinggi, yaitu 24,71 %. Fordia splendidissima merupakan jenis dengan INP tertinggi pada tingkat pancang dengan INP 29,94 %. Selanjutnya, pada tingkat semai, Pterospermum diversifolium tumbuh dominan dengan INP 26,87 %. Secara umum, hutan tepi Sungai Menamang didominasi oleh pohon-pohon yang relatif muda yang dicirikan dengan melimpahnya pohon-pohon berdiameter ≥ 10 -20 cm dan tinggi kurang dari 15 m. Kata kunci: hutan tepi sungai, Kalimantan Timur, Pongo pygmaeus morio, struktur dan komposisi vegetasi ABSTRACT This study aimed to obtain information on vegetation characteristics of the orangutan's habitat, including diversity

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Fluctuations of population density in Bornean orangutans (Pongo pygmaeus morio) related to fruit availability in the Danum Valley, Sabah, Malaysia: a 10-year record including two mast fruitings and three other peak fruitings

Cited by 32 publications

References 40 publications

Canopy structure drives orangutan habitat selection in disturbed Bornean forests

Canopy structure drives orangutan habitat selection in disturbed Bornean forests

The influence of logging on vertebrate responses to mast fruiting

Karakteristik Vegetasi Habitat Orangutan (Pongo pygmaeus morio) di Hutan Tepi Sungai Menamang, Kalimantan Timur

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