عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
TLpq304115899
انگلیسی
Ecology of Hose's langur, Presbytis hosei, in mixed logged and unlogged dipterocarp forest of northeast Borneo
[Thesis]
A. H. Mitchell
A. F. Richard
Yale University
1994
461
Ph.D.
Yale University
1994
This eighteen-month study examined the behavioral ecology of a colobine monkey in a lowland rain forest of Sabah, Malaysia. Hose's langur (Presbytis hosei), endemic to northeast Borneo, was studied intensively in a forested area with a range of disturbance from unlogged to heavily logged. Ecological and behavioral data on two social groups were collected. Three main forest types were selected for analysis: unlogged forest (UN), logged forest adjacent to unlogged forest (LA), and logged forest distant from unlogged forest (LD). Forest structure, species composition, phenology and phytochemistry were examined to determine differences among the research area's forest disturbance classes with respect to spatial and temporal availability and quality of langur resources. Data were used to evaluate the differential habitat use by langur groups in relation to disturbances. Hypotheses were evaluated including those concerned with the effects of forest disturbance on the distribution of resources and how this in turn influenced langur feeding and ranging. For trees of DBH usd\geusd 9.6 cm, the number of species ha was 141, 129 and 77 for UN, LA and LD forests, respectively, with 218 species in 114 genera and 43 families in the total sample of 1,521 trees. Tree biomass, represented by basal area, was dominated by Dipterocarpaceae in UN; colonizing species from four families in LD; and LA was more diverse and intermediate in its basal area distribution among families and species. Tree species clumping tended to increase with increasing logging intensity. The most common family of lianas was Fabaceae (Leguminoseae) at approximately 44% of all stems in each of the three forests. Young leaf production was negatively correlated with rainfall, with an increase during the driest months. The home range of langur group PH1 was predominantly logged forest and partially overlapped that of PH4, which ranged mostly in unlogged forest. PH1 used disturbance classes in direct proportion to their availability in its home range; PH4, however, showed strong preferences for the least disturbed class. Minimum home range areas were 45 ha and 35 ha, respectively. PH1's day-range lengths, number of food sources used per day and distances traveled between food sources were significantly greater than those of PH4. Group size was 7 to 8, and each group comprised an adult male, several adult females and younger classes. Langurs used food sources from 36 tree species and 16 lianas (mostly legumes). The proportion of food types in the diets differed significantly between groups; PH1 ate more unripe fruits and seeds, and PH4 was more folivorous. Most feeding records were from moderately logged forest and from forest gaps for PH1 and PH4, respectively. Foods were selected generally with a high protein to fiber ratio. This was the first intensive study of Hose's langur, one of a very few primate studies in logged forest, and adds to our knowledge of colobine ecology in Southeast Asia. This research also contributes to our understanding of the consequences of habitat alteration on the resources of a forest primate and its behavioral ecology, and has implications for management of primate populations in altered forests.
Biological sciences
Ecology
Malaysia
Physical anthropology
Social sciences
Zoology
A. F. Richard
A. H. Mitchell
مطالعه متن کتاب p
[Thesis]
276903
a
Y
