Utilization of forest flora by Phayre’s Leaf-Monkey Trachypithecus phayrei (Primates: Cercopithecidae) in semi-evergreen forests of Bangladesh

 

M.A. Aziz 1 & M.M. Feeroz 2

 

1 Lecturer, Department of Zoology, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh

2 Professor, Department of Zoology, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh

Email: 1 wildsamaa@yahoo.com ; 2 feerozmm@yahoo.com

 

 

Date of online publication 26 May 2009

ISSN 0974-7907 (online) | 0974-7893 (print)

 

Editor: Mewa Singh

 

Manuscript details:

Ms # o1868

Received 09 October 2007

Final received 13 November 2008

Finally accepted 01 May 2009

 

Citation: Aziz , M.A. & M.M. Feeroz (2009). Utilization of forest flora by Phayre’s Leaf-Monkey Trachypithecus phayrei (Primates: Cercopithecidae) in semi-evergreen forests of Bangladesh. Journal of Threatened Taxa 1(5): 257-262.

 

Copyright: © M.A. Aziz  & M.M. Feeroz 2009. Creative Commons Attribution 3.0 Unported License. JoTT allows unrestricted use of this article in any medium for non-profit purposes, reproduction and distribution by providing adequate credit to the authors and the source of publication.

 

Author Details: Mohammad Abdul Aziz is currently teaching students, undertaking and supervising various research activities. With background training in Wildlife Biology, his
research endeavor includes human-wildlife interactions, bidirectional zoonotic disease transmission, mammalian ecology and conservation, sustainable protected area management approaches, etc. Mohammed Mostafa Feeroz PhD is currently teaching students and developing, coordinating, and collaborating research design and activities with different educational and research institutions at home and abroad. His current research interest includes bidirectional zoonotic disease transmission, primate population genetics, ecology and conservation, avian influenza transmission and sustainable livelihood and protected area management.

 

Author Contribution: MAA conducted research in the field, analyzed data and wrote the manuscript. MMF helped design the study and provided necessary suggestions during manuscriptpreparation and write up.

 

Acknowledgments: Jahangirnagar University Authority awarded a research scholarship for the study. Department of Forest, Government of Bangladesh provided permission and necessary help during the study. Authors acknowledge their generous help. Wildlife Rescue Centre provided some logistical help.

 

 

For Figures, Images & Table – Click here

 

Introduction

 

Phayre’s leaf-Monkey Trachypithecus phayrei (Blyth 1847) is one of the three colobids found in Bangladesh. It is also found in Myanmar, China, India, Thailand, and Vietnam (Roonwal & Mohnot 1977; Gupta & Kumar 1994; Ruggeri & Timmins 1995/1996; Srivastava 1999).  In Bangladesh, it is found in semi-evergreen and semi-deciduous forests (Gittins & Akonda 1982; Feeroz et al. 1995a; Feeroz 1999).  Detailed studies have been conducted on various aspects of biology of this species in India (Mukherjee 1982; Choudhury 1987, 1988, 1994, 1996; Gupta & Kumar 1994; Raman et al. 1995; Srivastava 1999), Vietnam (Nisbett & Ciochon 1993;), Laos (Ruggeri & Timmins 1995/1996), China (MacKinnon & MacKinnon 1987; Xu & Tang 1990; Ye et al. 1989; Yuan et al. 1990) and in some parts of South Asia (Roonwal & Mohnot 1977).  In Bangladesh, several studies have been carried out on other available primate species found in Lawachara National Park (Feeroz 1991, 1999, 2001; Kabir 1991; Feeroz & Islam 1992; Feeroz et al. 1994; Ahsan 1994, 2000; Hasan et al. 2005) as well as other areas of the country (Akonda 1979; Khan 1981; Islam & Husain 1982).  However, as yet no ecological study has been carried out on this critically endangered species.  The present study was taken up to explore the utilization of forest flora by T. phayrei in Lawachara National Park, Bangladesh.

 

Methods

 

The study was conducted between September 2005 and June 2006 in Lawachara National Park (LNP), Bangladesh using the focal animal sampling method, as used by Altmann (1974), Werschkul (1979, 1982), Begum (2000) and Sultana et al. (2004).  An individual of T. phayrei was followed throughout the day from dawn to dusk.  When the animal was observed to eat parts of any plant species, the name and eaten parts were recorded.  The plant parts used by the animal were categorized and recorded as mature and young leaves, shoots, flowers and buds, mature or ripe fruits, unripe or green fruits, seeds and pods, and petioles.  Proportion of time spent on feeding of each food item was used to calculate the percentage of food items eaten at different hours of the day.  The plant species used by the animal were also ranked on the basis of their categorical uses (feeding, resting, sleeping) and access to food sources in the respective study period (food availability in the studied months).

Study area: Lawachara National Park, a part of the West Bhanugach Forest Reserve, is located approximately 160 km northeast of Dhaka and 60 km south of the city of Sylhet in the civil administrative units of Kamalgonj Police Station and Maulivibazar District of Sylhet Forest Division. It lies in the Bio-ecological zone of 9b-Sylhet Hills (Nishat et al. 2002). The park is situated within 24°030’-24°032’N & 91°037’-91°039’E coordinates.  The current notified area of the park covers an area of 1250 hectares and proposed area includes 281 hectares of West Bhanugach Reserved Forest (FSP, 2000a).

The forest type in this region is semi-evergreen (Craig 1991).  The floral diversity in the area includes 89 species of plants (Feeroz 1999; 107 species were recorded by Leech & Ali 1997).  The canopy height varies from 10 to 30 metres (Ahsan 1995; Feeroz 1999).  The top canopy comprises mainly Tectona sp., Ariocarpus chaplasha, Tetrameles sp., Hopea odorata, Toona ciliata, Pygenum sp, the second canopy primarily includes Quercus spp., Syzygium spp., Gmelina arborea, Dillenia pentagyna, Grewia cowa., Ficus spp. and the underneath is comprised mainly of Bambusa spp., Alsophila sp., Geodorum sp., Eupatorium odoratum with several ferns and epiphytes (Feeroz & Islam 1992, 2000).  The average tree density was recorded as 271 trees/ha with average species diversity 11.2 species/ha (Feeroz 1999).  Average maximum temperature (33.6°C) was recorded in March and average minimum temperature of 10°C was recorded in January.  The highest rainfall (456mm) was recorded in June during the study period.

 

Results

 

Food plants: T. phayrei consumed a variety of plant species as its food during the study period. It obtained food from 29 plant species in 14 botanical families.  Among the recorded plant taxa, Leguminosae and Moraceae provided the highest proportion (32%) of their food plants.  The Graminae provided mostly the leaves and shoots while the Leguminosae provided flowers, pods, leaves, and seeds.  Ranking analysis revealed that plant species of Leguminosae and Graminae ranked top in high usage category while most of fruit trees were used moderately.

Diet composition: The study revealed that young and mature leaves along with shoots provided the highest portion (66%) of diet followed by flowers and buds (16%), and fruits and seeds (14%; Fig. 1).  The flowers and buds of two leguminous species, Albizia procera and A. chinensis provided a large amount of food during April (30%).  The young and mature leaves along with shoots of Melocanna baccifera, M. bambusoides, Bambusa tulda, Toona ciliata, Chickrassia tabularis, Mikania corda, Gmelina arborea, Tectona grandis, Terminalia catappa and Acacia mangium provided supplemental food throughout the study period.  The unripe fruits of Garcinia cowa, Ficus spp., and Mangifera sylvestica were eaten to some extent.

Diurnal and monthly variation of feeding and foraging: the proportion of time spent feeding on different food items varied across months during the study period (Fig. 2).  Leaves were consumed mostly in December (76%) and least in April (49%) (mean = 66.2%, range = 49-76%, sd = ±28.29).  Fruits and seeds were eaten mostly in June (57%) when consumption of mature leaves was comparatively low (15%).  Feeding on flowers and buds peaked in April (41%) and was less in January (9%).  Bamboo shoots provided substantial amount (19%) of diet throughout the study period.

Time spent feeding on different food items also varied at different hours of the day (Fig. 3).  T. phayrei had two feeding peaks: one in early morning (0600-0800 ht) and another in late afternoon (1400-1600 hr).  During foraging and feeding, langurs divided into sub-troops but maintained a liaison among the dispersed members through visual and vocal contact.  When feeding on Melocanna baccifera, M. bambusoides, Bambusa tulda, Acacia chinensis and A. procera, group members foraged by sub-trooping dispersion.  T. phayeri used several plant species for resting purposes during daytime (Table 1).  They selected resting plants with extensive (A. chaplasha, G. arborea) and moderate shade (A. chinensis, M. baccifera, M. bambusoides, B. tulda or A. mangium).

 

Conclusion

 

Like most monkeys, T. phayrei feeds on fibre-rich foliage, shoots, petioles, leaves, flowers and buds. Some plant species provide food throughout the year, others are seasonal.  Thus survival of this species depends on the continued availability of food trees, and replacement of indigenous flora with exotic plants poses a threat to this and other primate species. Disturbances created by tourist activities, plantation encroachment, trains and motor vehicles passing through the park provide further challenges to their survival.

 

References

 

Ahsan, M.F. (1994). Behavioral ecology of the hoolock gibbon (Hylobates hoolock) in Bangladesh. Ph.D Thesis, Department of Anatomy, University of Cambridge, UK.

Ahsan, M.F. (1995). Fighting Between Two Females for a Male in the Hoolock Gibbon. International Journal of Primatology 16(5): 131-137.

Ahsan, M.F. (2000). Socio-ecology of the Hoolock Gibbon (Hylobates hoolock) in two forests of Bangladesh. Field Research,  284-299pp.

Akonda, A.W. (1979). Capped Langur (Presbytis pileatus) in Bangladesh. Abstract in 7th Congress of the International Primatological Society, held at Bangalore, India, 142pp.

Altmann, J. (1974). Observational study of behaviour: sampling methods. Behaviour 49: 222-267.

Aziz, M.A. (2007). Utilization of forest flora by the mammalian fauna of the Lawachara National Park, Bangladesh. Unpubl. M.Phil. thesis, Department of Zoology, Jahangirnagar University, Dhaka, Bangladesh.

Begum, S. (2000). Pattern of habitat use by pond heron (Ardeola grayii grayii) in Sitakunda. Bangladesh Journla of Life Science 12(1&2):15-22.

Bose, J. & P.C. Bhattacharjee (2002). Behavioural profile of a troop of Phayre’s leaf monkey (Trachypithecus phayrei) in a fragmented and disturbed habitat, northeast India. (abstract) XIX Congress of the International Primatological Society, Beijing, China, 0287.

Choudhury, A. (1987). Notes on the distribution and conservation of Phayre’s Leaf monkey and hoolock gibbon in India. Tigerpaper 14(2): 2-6.

Choudhury, A. (1987). Notes on the distribution and conservation of Phayre’s Leaf monkey and hoolock gibbon in India. Tigerpaper 14(2): 2-6.

Choudhury, A. (1988). Phayre’s Leaf Monkey (Trachypithecus phayrei) in Cachar. Journal of Bombay Natural History Society 85: 485-492.

Choudhury, A. (1994). Phayre’s Leaf Monkey (Trachypithecus phayrei) in North-east India. Tigerpaper 21(3): 1-4.

Choudhury, A. (1996). Primates in Assam – Status and conservation. Tigerpaper 23(3): 14-17.

Craig, B.S. (1991). The Capped Langur in Bangladesh: behavioural ecology and reproductive tactics. In: Contributions to Primatology 26, S. Larger, Basel.

Feeroz, M.M. (1991). Ecology and behaviour of hoolock gibbon (Hylobates hoolock) in Bangladesh. M.Sc. thesis. Department of Zoology, Jahangirnagar University.

Feeroz, M.M. (1999). Ecology and behaviour of the pig-tailed macaque (Macaca nemestrina leonina) in Bangladesh. Unpubl. Ph.D. thesis. University of Cambridge, Cambridge, UK.

Feeroz, M.M. (2001). Species diversity and population density of non-human primates in north-east and south-east of Bangladesh. ECOPRINT 8(1):53-57.

Feeroz, M.M. & M.A. Islam (1992). Ecology and behaviour of hoolock gibbons of Bangladesh. MARC, Dhaka, Bangladesh. xv+76 pp.

Feeroz, M.M. & M.A. Islam (2000). Primates of the West Bhanugach Forest Reserve: major threats and management plan, pp. 239-253. In: Bangladesh Environment 2000, M. Feeroz Ahmed (ed.). BAPA Bangladesh Poribesh Andolon.

Feeroz, M.M., M.A. Islam & M.M. Kabir (1994). Food and feeding behaviour of hoolock gibbon (Hylobates hoolock), capped langur (Presbytis pileata) and pigtailed macaque (Macaca nemestrina) of Lawachara. Bangladesh Journal of Zoology 22(2): 123-132.

Feeroz, M.M., M.A. Islam and M.M. Kabir (1995a). Status distribution and conservation of primates of Bangladesh. Kyoto Univ. Overseas Research Report of Study on Asian Non-human Primates, 9:73-82.

FSP (Forestry Sector Project) (2000a). First Five Year Management Plan for Lawachara National Park. Vol. 1: Management Plan. Forest Department, Ministry of Environment and Forests, Dhaka.

Gittins, S.P. & A.W. Akonda (1982). What survives in Bangladesh? Oryx 16(3): 275-281.

Gupta, A.K. (1996). Dietary differences between Phayre’s langur (Trachypithecus phayrei) groups in Gumti and Sepahijala Wildlife Sanctuary, north east India: Responses to food availability, adaptability and human influence. (abstract) IPS/ASP Congrssabstracts. Madison, WI, USA, 161pp.

Gupta, A.K. (1997). Importance of forestry plantations for conservation of Phayre’s langur (Trachypithecus phayrei) in north-east India. Tropical Biodiversity 4(2): 187-195.

Gupta, A.K. & A. Kumar (1994). Feeding ecology and conservation of the Phayre’s Leaf Monkey (Trachypithecus phayrei) in north-east India. Biological Conservation 69:301-306.

Hasan, M.K., M.M. Feeroz, M.M. Kabir, M.A. Islam, S. Begum, M.A. Aziz & G.C. Sarker (2005). Food and feeding behaviour of Hoolock gibbon (Bunopithecus hoolock) in the Lawachara National Park, Bangladesh. Bangladesh Journal of Life Science 17(1): 43-49.

Islam, M.A. & K.Z. Hussain (1982). A Priliminary Study on the Capped Langur. Folia Primatol 39: 145-159.

Kabir, M.M. (1991). Ecology and behaviour of Capped langur (in west Bhanugach) reserve forest and Madhupur National park. M.Sc. thesis (unpubl.), Department of Zoology, Jahangirnagar University, Savar, Dhaka, Bangladesh.

Kabir, M.M. (2002). Behavioural ecology of two sympatric langur species in the semi-evergreen forests of Bangladesh. PhD thesis (unpubl.), Department of Anatomy, University of Cambridge, UK.

Khan, M.A.R. (1981). The non-human primates of Bangladesh. Tigerpaper 8(1): 12-15.

Leech, J. & S.S. Ali (1997). Extended Natural Resources Survey: Part IV – plant and animals species lists. GoB/WB Forest Resources Management Project, Technical Assistance Component. Mandala Agricultural Development Corporation, Dhaka, Bangladesh.

MacKinnon, J. & K. MacKinnon (1987). Conservation status of the primates of the Indo-Chinese subregion. Primate Conservation 8: 187-195.

Nisbett, R.A. & R.L. Ciochon (1993). Primates in northern Viet Nam: A review of the ecology and conservation status of extant species, with notes on Pleistocene localities. International Journal of Primatology 14(5): 765-795.

Mukherjee, R.P. (1982). Phayre’s Leaf Monkey (Trachypithecus phayrei) in Tripura. Journal of the Bombay Natural History Society 79: 47-56.

Nishat, A., S.M. I. Huq, S.P. Barua, A.H.M. Reza & A.S.M. Khan (eds.) (2002). Bio-ecological Zones of Bangladesh, IUCN-Bangladesh, Dhaka, 141pp.

Raman, T.R.S., C. Mishra & A.J.T. Johnsingh (1995). Survey of primates in Mizoram, north-east India. Primate Conservation 16: 59-62.

Roonwal, M.L. & S.M. Mohnot (1977). Primates of South Asia: Ecology, Sociobiology, and Behavior. Harvard University Press: Cambridge, Mass.

Ruggeri, N. & R.J. Timmins (1995/1996). An initial summary of diurnal primate status in Laos. Asian Primates 5(3/4): 1-3.

Srivastava, A. (1999). Primates of Northeast India. Megadiversity Press: Bikaner, India.

Stanford, C.B. (1988). Ecology of the capped langur and Phayre’s leaf monkey in Bangladesh. Primate Conservation l. 9: 125-128.

Sultana, S., S. Begum & M.M. Feeroz (2004). Comparative study on breeding activities of three wetland birds in Bangladesh. Bangladesh Journal of Life Sci. 16(2): 67-73.

Werschkul, D.F. (1979). Nesting mortality and the adaptive significance of early locomotion in the little Rluettive. Auk 96: 116-130.

Xu, J.J. & C.K. Tang (1990). The comparative on haemoglobin and several isozyme of black snub-nosed monkey and Phayre’s Leaf monkey. Zoological Research 11(3): 178.

Ye, Z.Z., R.L. Pan & Y.Z. Peng (1989). Arterial system of Francois’s and Phayre’s Leaf Monkey. Zoological Research 10: 19-28.

Yuan, C., Y.L. Zhou & Y.Y. Ma (1990). Comparative neuroanatomy and evolution of Presbytis phayrei. Acta Zoologica Sinica 36(3): 324-326.