Ranging Behavior of Proboscis Monkeys in a Riverine Forest with Special Reference to Ranging in Inland Forest

Matsuda, Ikki; Tuuga, Augustine; Higashi, Seigo

doi:10.1007/s10764-009-9344-3

Cited by 110 publications

(61 citation statements)

References 26 publications

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“…Both males and females disperse (Bennett & Sebastian 1988). Among females, sub-adult female dispersal is more common, although dispersal of adult females with infants has been observed as well (Matsuda et al 2009). …”

Section: Study Speciesmentioning

confidence: 99%

Modeling population viability of local proboscis monkey Nasalis larvatus populations: conservation implications

Stark¹,

Nijman²,

Lhota³

et al. 2012

Endang. Species. Res.

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Population viability analysis (PVA) is a predictive procedure that uses different modeling approaches to estimate species vulnerability to extinction. Using the stochastic modeling software VORTEX, we assessed the status of proboscis monkeys Nasalis larvatus in 3 fully or partially protected areas in Borneo, 1 in the Malaysian state of Sabah and 2 in the Indonesian provinces of Kalimantan. Species-specific life-history parameters were used when possible, and missing parameters were taken from other populations or species. We tested the sensitivity of final predicted population size to 20% variation around the possibly inaccurate parameter estimates. The model we used predicts that in the absence of any management, the Malaysian population will remain fairly stable, whilst the 2 Indonesian populations will decrease by more than half, the smallest going effectively extinct in 30 yr. We investigated whether management strategies, such as reforestation, corridors to reconnect sub-populations, harvesting, reduction of deforestation and controlling fires, might help forestall population extirpation at each site. Fire had the greatest impact on the Indonesian populations, although hunting is also likely to play an important role. Remedial action to reduce the frequency and extent of fires, perhaps by regulated land clearing for agriculture, should slow proboscis monkey population decline and provide more time to collect the data necessary to evaluate other management decisions. As information regarding mortality, the effect of fire, and hunting rates on proboscis monkeys is limited, further research should concentrate on these areas to improve PVAs for this species.

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Section: Study Speciesmentioning

confidence: 99%

Modeling population viability of local proboscis monkey Nasalis larvatus populations: conservation implications

Stark¹,

Nijman²,

Lhota³

et al. 2012

Endang. Species. Res.

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“…Karakteristik habitat, ketersediaan pakan, dan ukuran kelompok sangat berpengaruh terhadap perilaku dan pergerakan bekantan, baik itu wilayah jelajah (home range), pergerakan harian, dan ritme aktivitas bekantan (Matsuda et al, 2009;Boonratana, 2000;Matsuda et al, 2014). Informasi terkait perilaku dan pergerakan bekantan pada habitatnya dapat digunakan sebagai dasar untuk merumuskan strategi dalam pembinaan dan pelestarian bekantan dan habitatnya.…”

Section: Pendahuluanunclassified

“…Untuk mengetahui jelajah harian dilakukan dengan mengikuti kelompok bekantan melalui darat dan sungai, kemudian diambil data koordinat lokasinya menggunakan GPS setiap terjadi perpindahan (Matsuda et al, 2009).…”

Section: Metode Kerjaunclassified

“…Pergerakan harian kelompok bekantan di lokasi ini lebih pendek dibandingkan di lokasi lainnya yang rata-rata 541 m (Soendjoto, 2005), 799 m (Matsuda et al, 2009), 904.2 m (Kartono et al, 2008), 910 m (Boonratana, 2000), dan 1.100 m (Bismark, 2009).…”

Section: Pergerakan Horizontalunclassified

“…Berbeda dengan hasil penelitian Boonratana (2000) yang menyatakan bahwa tidak ada korelasi antara rata-rata jarak pergerakan harian bulanan dengan curah hujan, fenologi, dan pakan (buah, biji, bunga), namun jarak pergerakan harian berkorelasi dengan sumber pakan daun muda. Matsuda et al (2009) menambahkan bahwa perjalanan harian bekantan akan lebih jauh pada saat proporsi pakannya lebih banyak daun muda dari pada buah, sehingga kelompok bekantan akan lebih sering menggunakan areal yang berdekatan dengan tepi sungai dengan ketersediaan buah yang tinggi.…”

Section: Pergerakan Horizontalunclassified

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Behavior and group movement of proboscis monkey’s (Nasalis larvatus Wurmb.) in Samboja, East Kalimantan

Atmoko

Mardiastuti

Iskandar³

2017

JPKW

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Bekantan (Nasalis larvatus Wurmb.) adalah primata endemik di Pulau Borneo. Masalah utama yang dihadapi dalam melestarikan bekantan adalah hilangnya habitat, fragmentasi dan degradasi hutan. Penelitian perilaku pergerakan kelompok bekantan telah dilakukan di habitat bekantan yang terisolasi dan terfragmentasi di Samboja, Kalimantan Timur. Pergerakan bekantan meliputi jelajah harian dan pemanfaatan ketinggian tajuk. Pengamatan perilaku bekantan menggunakan metode instantaneous sampling. Aktivitas yang diamati adalah aktivitas makan, bergerak, sosial, istirahat, dan tidur. Jelajah harian bekantan diikuti pergerakannya dan dicatat koordinat posisinya. Pengamatan pemanfaatan ketinggian strata tajuk pada ketinggian aktivitas 0-3 m, 3,1-6 m, 6,1-9 m, 9,1-12 m, dan >12 m. Petak pengamatan pohon pada masing-masing habitat dibuat berukuran 20 m x 200 m. Hasil penelitian menunjukkan bahwa pergerakan harian bekantan bervariasi, yaitu berkisar antara 25,7 m s/d 749,9 m (rata-rata 333 m), dengan wilayah jelajah yang sempit, yaitu berkisar antara 4,52 ha s/d 6,92 ha. Jarak pergerakan harian antar kelompok bekantan berbeda secara signifikan pada tiga habitat. Secara umum pemanfaatan strata tajuk oleh bekantan tergantung pada kondisi habitat, tinggi, diameter dan kerapatan pohon. 0-3 m, 3.1-6 m, 6.1-9 m, 9.1-12 m, and > 12

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The feeding ecology and activity budget of proboscis monkeys

Matsuda

Tuuga

Higashi

2009

American J Primatol

Self Cite

140

119

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A group of proboscis monkeys (Nasalis larvatus) consisting of an alpha-male, six adult females, and several immatures was observed from May 2005-2006. We collected over 1,968 hr of focal data on the adult male and 1,539 hr of focal data on the six females in a forest along the Menanggul River, Sabah, Malaysia. Availability and seasonal changes in plant species consumed by the focal monkeys were determined by vegetation surveys carried out across an area of 2.15 ha along 200-500 m trails in riverine forest. A total of 188 plant species were consumed by the focal monkeys. The activity budget of members of our study group was 76.5% resting, 19.5% feeding, and 3.5% moving. Young leaves (65.9%) and fruits (25.9%) accounted for the majority of feeding time. Over 90% of fruit feeding involved the consumption of unripe fruits and in the majority of case both the fruit flesh and seeds were eaten. Although fruit eating was rare in some months, during other times of the year time fruit feeding exceeded the time devoted to young leaves. We found that monthly fruit availability was positively related to monthly fruit eating and feeding activity, and seasonal fluctuations in dietary diversity were significantly affected by fruit eating. These results suggest that fruit availability and fruit-eating behaviors are key factors that influence the activity budget of proboscis monkeys. Earlier assumptions that colobine monkeys are obligate folivores do not apply well to proboscis monkeys and certain other colobines. Our findings may help contribute to a better understanding of the dietary adaptations and feeding ecology of Asian colobines.

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Ranging Behavior of Proboscis Monkeys in a Riverine Forest with Special Reference to Ranging in Inland Forest

Cited by 110 publications

References 26 publications

Modeling population viability of local proboscis monkey Nasalis larvatus populations: conservation implications

Modeling population viability of local proboscis monkey Nasalis larvatus populations: conservation implications

Behavior and group movement of proboscis monkey’s (Nasalis larvatus Wurmb.) in Samboja, East Kalimantan

The feeding ecology and activity budget of proboscis monkeys

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