Albert Fellows Dissertation Research Grant

2017 Recipients

Liz Ballare

Health effects of rehabilitation and release in Bornean orangutans (Pongo pygmaeus wurmbii)

Wild orangutans are found only in Borneo and northern Sumatra. With increasing anthropogenic activities in these regions, both species (Pongo pygmaeus spp. and Pongo abelii) are listed as critically endangered. Rehabilitation and release programs have become a critical component of the Species Survival Plan. These management procedures place orangutans into new environments where they must quickly adapt to changes in enrichment, social structure, mate choice, and diet. Millions of dollars are spent on medical care, release, and informal observation of these individual orangutans, and yet we still know very little about how the health of these animals varies during the rehabilitation and release process.

This research systematically measures protein, energy balance, stress, and immune responsiveness from urine samples, as well as gastrointestinal parasites in feces throughout she rehabilitation process and after release at two sites operated by the Borneo Orangutan Survival Foundation in Central Kalimantan, Indonesia: the Nyaru Menteng Rehabilitation Center and the Bukit Batikap Conservation Forest. These data will be directly compared to corresponding data from a wild population that has been studied by Dr. Erin Vogel and colleagues for nearly 15 years at the Tuanan Orangutan Research Station, also in Central Kalimantan. Ballare’s goal is to better inform release monitoring methods and thereby improve significantly the orangutan’s chances of survival in the wild.

Alex Pritchard

Personality of stress coping: Influence on social complexity

It has long been appreciated that “personality” describes consistent individual differences in behavior and cognition, and studies of humans additional suggest that personality-based attributes strongly affect the quality of individual social bonds. Central to this framework is the stress response system, an organism’s way of regulating behavioral and physiological reactions to challenges – or stressors – to maintain physiological stability.

This research examines how consistent individual differences in handling stress both affects and is affected by social life among wild olive baboons (Papio anubis) that have been studied by Ryne Palombit and students for many years. Pritchard will use systematic observational techniques, field experiments, social network analysis, and fecal hormone collection to measure individual differences in psychologically defined coping styles and coping outlets, basal glucocorticoid levels, and sociality. He’s particularly interested in the consequences of these differences for understanding the stability of the complex social relationships and coalitionary support system for which olive baboons are famous. His measurement of variation in stress hormones will add a valuable physiological dimension to this analysis of personality and social network. This study will contribute significantly to the growing data base on the phenomenon of “personality” in nonhumans, the eventual development of a unified evolutionary theory of personality, and our understanding of humans through study of a nonhuman primate characterized by pronounced behavioral variability and social complexity.

2016 Recipients

Mareike Janiak

Adaptations for insectivory in digestive enzymes of New World primates

The objective of this research is to identify functional genetic variation relating to chitinolytic and proteolytic digestive enzymes as adaptations for insectivory in New World monkeys (platyrrhines). Chitin is the main component of the cell walls of fungi and insect exoskeletons, both food resources for primates (Raubenheimer & Rothman, 2013; Hanson et al., 2006; Hilário & Ferrari, 2011). Whether human and non-human primates have the ability to digest chitin has not been conclusively answered, a knowledge gap this study aims to fill.

The improved understanding of digestive enzymes and relevant genetic variation found in New World monkeys that will be accomplished by this study will allow comparisons with other primate groups, such as Old World monkeys, apes, and humans. Furthermore, it will give us insight into the evolution of dietary ecologies and dietary adaptations of primates past and present, as well as a better grasp of the digestive capabilities of different species. Knowing the digestive abilities and limits of species has important implications for the conservation of all mammals, including primates. For example, the management of captive individuals can be improved by tailoring feeding decisions to the digestive abilities of each species. In the wild, decisions about the conservation/reconstruction of habitats and food resources (including insect species) can be informed by the dietary needs of local primate species.

Stan Kivai

Nutritional and mechanical properties of plant foods with implications for juvenile foraging efficiency and conservation of Tana River mangabeys, Kenya

The ongoing debate about the competency of juvenile foraging (and hence survival) partly concerns the nature of juvenile-adult differences in feeding and whether differences are due to experience, body size, or both (Janson & van Schaik, 1993; Lonsford & Ross, 2012). Moreover, studies have yielded contradictory results about the timing of juvenile competence in feeding: in some species it appears to arise late in development, close to the time of maturity, while in other species it occurs long before maturity (Pereira & Fairbank, 2002; Gunst et al., 2010). Analysis that integrates field data on both the mechanical and nutritional characteristics of food items and how juveniles achieve foraging efficiency has yet to be attempted to resolve these theoretical debates. In this study, juvenile Tana River mangabeys (TRM) will be considerd to to address the following questions. Compared to adult females, how do juveniles differ in: (1) diet, particularly in food choice? (2) the influence of mechanical and nutritional properties on foraging decisions?; (3) behavioral strategies employed to overcome the nutritional and mechanical constraints? and, (4) use the data to foster long-term conservation of the Tana River primate community.

Data from this study also have broader implications for conservation. Food properties are known to influence primate habitat quality, population abundance, and persistence (Hanya & Chapman, 2013). And juvenile survival and recruitment into reproductive age class is a major focus in conservation of endangered species facing risk of extinction (Fryxell et al, 2014).