Sindhu Radhakrishna

Exudativory in the Bengal slow loris (Nycticebus bengalensis) in Trishna Wildlife Sanctuary, Tripura, northeast India

In this study we estimated the extent of exudativory in Nycticebus bengalensis and examined whether exudates can be considered as fallback foods. This study was carried out in Trishna Wildlife Sanctuary, northeastern India, in winter (December–February) and summer (March and April). We estimated time–activity budget using instantaneous sampling and used continuous focal animal sampling to record all instances and durations of feeding, over a total of 177 hr. Feeding accounted for 22.3±2.2% of the activity budget, with no seasonal difference. Bengal slow lorises fed on exudates, nectar, fruit, bark, invertebrates and avian eggs. In addition to scraping they also obtained exudates by gouging holes into the bark of trees. In winter, lorises almost exclusively fed on exudates (94.3% of winter feeding time). In summer, exudates (67.3%) and nectar from one species (22.3%) dominated the diet. This study identifies the Bengal slow loris as the most exudativorous loris. Exudates rather than being a staple fallback food, seem to be a preferred, patchily distributed and common food in the diet of the Bengal slow loris. Exudativory in this species is characterized by high selectivity among species and seasonal variation, which may be related to variations in productivity of exudates and their chemical composition. An understanding of these factors is necessary for predicting the response of this species to human disturbance such as logging. This study also underscores the importance of protecting some of the common species such as Terminalia belerica on which the loris feeds during periods of scarcity. Am. J. Primatol. 72:113–121, 2010.

Seed dispersal by rhesus macaques Macaca mulatta in Northern India

Frugivorous primates are important seed dispersers and their absence from forest patches is predicted to be detrimental to tropical forest regeneration and recruitment. With the reduction of primate populations globally, ecologically resilient primate species, characterized by dietary flexibility and the ability to thrive in a variety of habitats, assume new importance as seed dispersers. The most widely distributed non‐human primate, the rhesus macaque Macaca mulatta has been intensively studied but little is known about its role in maintaining ecosystem structure and functions. Due to their frugivorous diet, large group sizes, large home ranges and tolerance to disturbance, rhesus macaques may be effective seed dispersers. We studied seed dispersal by rhesus macaques at the Buxa Tiger Reserve, India, through a combination of behavioural observations and germination experiments. Rhesus macaques dispersed 84% of the 49 species they fed on either through spitting or defecation. Nearly 96% of the handled seeds were undamaged and 61% of the species for which germination tests were performed had enhanced germination. Almost 50% of the monitored seeds among those deposited in situ germinated and 22% established seedlings, suggesting that rhesus macaques are important seed dispersers in tropical forests. Due to their widespread distribution and large populations, rhesus macaques are perceived as common and are categorized as Least Concern on the IUCN Red List, effectively excluding them from any conservation plans. Based on the results of our study, we argue that rhesus macaques fulfill critical ecological functions in their habitat and that this parameter must be taken into consideration when they are reviewed for conservation priorities. Am. J. Primatol. 76:1175–1184, 2014.

Social Behaviour of the Slender Loris (Loris tardigradus lydekkerianus)

The social behaviour of the nocturnal prosimian Loris tardigradus lydekkerianus in its natural habitat was studied for 21 months in a scrub jungle in Dindigul, southern India. A total of 22,834 scans were collected during 2,656 hours of observation on identified and unidentified lorises. Social interactions were observed between individuals of all age-sex classes, both during the night and at dawn, when the animals met to sleep together. The majority of aggressive encounters between individuals occurred in territorial and mating contexts. Individuals also communicated with each other through chemical and vocal signals. Adults and sub-adults of both sexes were observed to immigrate into the study area, leading to social interactions with resident individuals.

Primates, Provisioning and Plants: Impacts of Human Cultural Behaviours on Primate Ecological Functions.

Human provisioning of wildlife with food is a widespread global practice that occurs in multiple socio-cultural circumstances. Provisioning may indirectly alter ecosystem functioning through changes in the eco-ethology of animals, but few studies have quantified this aspect. Provisioning of primates by humans is known to impact their activity budgets, diets and ranging patterns. Primates are also keystone species in tropical forests through their role as seed dispersers; yet there is no information on how provisioning might affect primate ecological functions. The rhesus macaque is a major human-commensal species but is also an important seed disperser in the wild. In this study, we investigated the potential impacts of provisioning on the role of rhesus macaques as seed dispersers in the Buxa Tiger Reserve, India. We studied a troop of macaques which were provisioned for a part of the year and were dependent on natural resources for the rest. We observed feeding behaviour, seed handling techniques and ranging patterns of the macaques and monitored availability of wild fruits. Irrespective of fruit availability, frugivory and seed dispersal activities decreased when the macaques were provisioned. Provisioned macaques also had shortened daily ranges implying shorter dispersal distances. Finally, during provisioning periods, seeds were deposited on tarmac roads that were unconducive for germination. Provisioning promotes human-primate conflict, as commensal primates are often involved in aggressive encounters with humans over resources, leading to negative consequences for both parties involved. Preventing or curbing provisioning is not an easy task as feeding wild animals is a socio-cultural tradition across much of South and South-East Asia, including India. We recommend the initiation of literacy programmes that educate lay citizens about the ill-effects of provisioning and strongly caution them against the practice.

Of Least Concern? Range Extension by Rhesus Macaques (Macaca mulatta) Threatens Long-Term Survival of Bonnet Macaques (M. radiata) in Peninsular India

Rhesus and bonnet macaques are the 2 most common and widely distributed of the 8 macaque species of India. Rhesus macaques are widely distributed across southern and southeastern Asia, whereas bonnet macaques are restricted to peninsular India. We studied the current distributional limits of the 2 species, examined patterns of their coexistence in the interspecific border zones, and evaluated losses in the distributional range of bonnet macaques over the last 3 decades. Our results indicate that whereas rhesus macaques have extended their geographical range into the southern peninsula, bonnet macaques have been displaced from many areas within their former distributional range. The southern and the northern distributional limits for rhesus and bonnet macaques, respectively, currently run parallel to each other in the western part of the country, are separated by a large gap in central India, and converge on the eastern coast of the peninsula to form a distribution overlap zone. This overlap region is characterized by the presence of mixed-species troops, with pure troops of both species sometimes occurring even in close proximity to one another. The range extension of rhesus macaque—a natural process in some areas and a direct consequence of introduction by humans in other regions—poses grave implications for the endemic and declining populations of bonnet macaques in southern India.

A god becomes a pest? Human-rhesus macaque interactions in Himachal Pradesh, northern India

Human-rhesus macaque conflict due to crop raiding is a major problem affecting northern India, particularly the states of Himachal Pradesh and Uttarakhand. Management techniques are challenging both due to the commensal nature of the macaque as well as the culturally significant status of the species in India. Studies on wildlife crop raiding indicate that people’s reactions to crop raiding are strongly influenced by their attitudes towards the species involved and that insights into these perceptions are critical to work towards conflict-resolution measures. Hence, we investigated the attitudes and perceptions of farmers in Bilaspur district, Himachal Pradesh, towards the rhesus macaque (Macaca mulatta) and the impact of macaque crop raiding on their lives. We interviewed 54 farmer-families from five villages in Bilaspur and collected data on the extent of crop damage caused by wildlife species, farmers’ attitudes towards the rhesus macaque and conflict-mitigation strategies as suggested by the farmers. The results of our study indicate that farmers hold ambivalent attitudes towards the rhesus macaque and mixed opinions regarding its management.

Home range and ranging pattern in the slender loris(Loris tardigradus lydekkerianus).

The home range and ranging pattern of the slender loris (Loris tardigradus lydekkerianus) was studied for 21 months in a scrub jungle in Dindigul, Tamil Nadu, south India. Sixteen individuals were observed for a total of 2261 hours. Home ranges were measured for eight adult individuals and eight juvenile and subadult individuals. Males had significantly larger home ranges than the females, and home range size increased post-weaning. The ranging patterns involved minimal female intrasexual overlap, large male intrasexual overlap and large intersexual range overlap.

Less than wild? Commensal primates and wildlife conservation

Sometime in the early 1940s, just after the outbreak of the Second World War, a very unusual consignment waited in the shipyard of the Mumbai (then Bombay) port for deportation. Freight space being shaped by war demands, the fate of this particular non-essential cargo hung in the balance for some time. Finally, it was decided that it was not possible to export the monkeys, which constituted this singular shipment, at that time and that they should be released. This was, of course, one of the many consignments of rhesus macaques that were shipped from India to laboratories in North America and Europe in the 20th century until the ban in 1978 (Ahmed 2001; Rao 2003). In what was probably intended as a kind gesture, the box load of rhesus macaques were released in and around Mumbai (Serrao and Amladi 1979). Until then, the only species of macaque that was found in Mumbai was the bonnet macaque, Macaca radiata (Serrao and Amladi 1979), as the natural geographical limit of the rhesus macaque, Macaca mulatta, in western India was further north, around the river Tapti (Fooden et al. 1981; Koyama and Shekar 1981). Although the particular contours of this tale are rather uncommon, the practice of humans transporting monkeys outside their natural geographic realms itself is not very infrequent. Humans have been responsible for the introduction of macaque species in many parts of the world that has resulted in either an extension of the geographical range of the species or the creation of new exotic populations of the species (Fooden 2000; Long 2003). Perhaps the earliest of such cases was the introduction of bonnet macaques (that are endemic to southern India) to the Mascarene Islands, east of Madagascar, by Portuguese sailors in the 16th century (Fooden 1981). The Taiwanese macaque was introduced to Japan, the long-tailed macaque to the Tinjil Island of Indonesia, and several species of macaques including the pig-tailed macaque, Japanese macaque, and Tibetan macaque were introduced to Kowloon, Hong Kong (Southwick and Southwick 1983; Kyes 1993; Burton and Chan 1996; Kawamoto et al. 2001). In 1938, over four hundred rhesus macaques were transported from India to the island of Cayo Santiago, near Puerto Rico; since then, this island of free-ranging, provisioned monkeys has functioned as a research facility of the Caribbean Primate Research Center (Rawlins and Kessler 1986).

Reproductive biology of the slender loris (Loris lydekkerianus lydekkerianus).

The slender loris (Loris lydekkerianus lydekkerianus), a nocturnal prosim-ian, was studied for 21 months in its natural habitat of scrub jungle in Dindigul, south India. Here we report on its reproductive biology. Identified and unidentified lorises were observed for a total of 2,656 h. Reproductive seasonality was seen, with births and oestrus observed to be highest in April–June and October–December. The mating system was promiscuous with 1 female mating successively with 3–4 males. A gestation period of 5.5 months and an inter-birth interval of 7 months were recorded. Adult females had a reproductive potential of 4 infants per year. The findings presented in this paper constitute the first information on the life history parameters of wild slender lorises.

Population survey of the Bengal slow loris, Nycticebus bengalensis in Meghalaya, northeast India

Abstract: The Bengal slow loris Nycticebus bengalensis is a nocturnal prosimian that inhabits the forests of northeastern India. As with many nocturnal prosimian species, little is known about its behavior or ecology; even less information is available on its distribution and population status in northeastern India. We conducted a survey of forest patches in the state of Meghalaya, in northeast India, in order to assess its distribution. A secondary aim of our study was to estimate the severity of threats that may affect the long-term survival of the slow loris in Meghalaya. We surveyed sixteen sites in six districts. Slow lorises were seen in only two sites; however, information obtained through secondary sources indicated that they were present in a number of other forest patches across the state. Many of the forests surveyed were severely affected by logging, poaching and forest fires; it is imperative that conservation measures, aimed at protecting existing forest patches, be implemented in order to ensure the long-term survival of the slow loris and other mammals in the state.