City living – assessing the welfare costs of urban living in spotted hyaena (Crocuta crocuta)

Grantee: Emma Stone

Institutions: Carnivore Research Malawi and University of the West of England, United Kingdom

Grant amount: $30,000

Grant type: Small grants

Focal species: Spotted hyaena (Crocuta crocuta)

Conservation status: Least concern

Disciplines: Human-wildlife conflict, physiology, animal welfare science, animal behavior, infections disease

Research location: Malawi

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Project summary

Lilongwe City (the capital of Malawi, central Africa) has a good network of green spaces and river corridors, supporting a population of urban spotted hyena (Crocuta crocuta). However, human-wildlife conflict (HWC) is frequent, often resulting in persecution of these animals. Using non-invasive techniques, this project will measure and compare the fecal and hair cortisol levels (as a proxy of stress), mean body condition, tooth ware, hematological parameters, and disease (toxoplasmosis and rabies) in spotted hyena between urban (Lilongwe district) and rural (Kasungu National Park) populations. Behavioral experiments (exposure to novel objects and threatening scents) will also be used to assess individual boldness in urban and rural populations as a risk factor, which may increase propensity for HWC and therefore mortality and stress. Results will be used to inform policies to reduce HWC and implement welfare considerations as part of the population’s conservation management plan.

Why we funded this project

Interactions between people and wildlife are increasing as urban areas expand. This is of particular concern with carnivores, as even small species can be perceived as threatening. Despite the fact that the developing world has the highest rate of urbanization, urban carnivore studies have generally focused on European and Asian cities, with research on African cities being relatively neglected. Although HWC is a traditional issue in conservation, we have encountered few projects that effectively address the more neglected question of how HWC interacts with non-anthropogenic welfare impacts. By considering a variety of welfare indicators/factors, including disease transmission and social dynamics, this project will help us understand that interaction, producing results that can be translated into more abundant urban species. Additionally, by funding at least some projects on endangered species, we increase the likelihood of our welfare-focused message reaching conservation practitioners, potentially leading to a greater emphasis on and interest in welfare within that community.

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From rehabilitation centers to the wild: Evaluating brown bear stress using blood and scat parameters

Grantee: Morteza Naderi

Institution: Koç University, Turkey

Grant amount: $29,955

Grant type: Small grants

Focal species: Brown bear (Ursus arctos)

Conservation status: Least concern

Disciplines: Population ecology, animal welfare science, human-wildlife conflict

Research location: Turkey

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Project summary

Brown bears play a prominent role in the ecosystems of northern and eastern Turkey. However, there are serious long-term threats to their welfare and viability that are common to other large omnivores, such as habitat fragmentation and increasing contact with humans. For example, open garbage dumps are located across the bear’s distribution and affect behavioral patterns in bears, including seasonal migration habits, whereby the bears would normally move into different areas to exploit seasonal resources. This project will involve a collaboration with KuzeyDoga, one of the only nature conservation NGOs in Turkey, to monitor the behavior and stress physiology of individual free-living bears using GPS collars, camera traps, and blood and fecal glucocorticoids (GCs). The location and behavior data will allow them to document what stimuli individual bears have been exposed to (e.g. use of garbage dumps, proximity to roads), and when. This information can then be paired with the GC results to better understand the welfare implications of those exposures. The study of wild bears will also be complemented by the same physiological measurements on bears residing at a rehabilitation center in the region, which come from a similar genetic and early-life background to the free-living bears.

Why we funded this project

This project addresses our objective of validating non-invasive physiological welfare indicators (e.g. fecal GCs) against behavior and known environmental stressors. The pairing of wild and captive (rescued/rehabilitated) individuals is also notable because the captive individuals can serve as a sort of control group due to their controlled environment at the rehabilitation center. Although brown bears in Turkey are not as numerous as some other species we tend to prioritize research on, they and the threats they face are ecologically similar to those faced by most bears worldwide, especially North American black bears, who number many hundreds of thousands. Therefore, we expect the findings of this project to be at least partially generalizable to more than one million potentially long-lived individuals.

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Introducing a novel tool to compare stress levels in captive and wild Macaca fascicularis

Grantee: Vets4welfare

Institution: Vets4welfare Foundation, Netherlands

Grant amount: $20,000

Grant type: Small grants

Focal species: Crab-eating macaque (Macaca fascicularis)

Conservation status: Endangered

Disciplines: Physiology, wildlife rehabilitation, human-wildlife conflict

Research location: Indonesia, Netherlands

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Project summary

This project will compare cortisol concentrations in the hair of Indonesian monkeys (Macaca fascicularis) from three groups: a group whose members have spent their whole lives in the wild, a group that has been kept in captivity for the entertainment industry, and a group that are in the process of rehabilitation following rescue from the entertainment industry. Hair measurements can reflect welfare over a long period, as they integrate cortisol as they slowly grow. The concentration of cortisol in a segment of a hair is thought to reflect the activity of the animal’s physiological stress response at the time that segment was produced. On that premise, the project aims to compare the stress response of M. fascicularis under wild, poor-welfare captive (entertainment), and high-welfare captive (rehabilitation) environments. The hair cortisol data will be compared with veterinary and forensic records and other welfare-relevant observations (e.g., of infections or injuries) where possible. The researchers also intend to determine whether mistreatment in captivity leaves a signal in hair cortisol that could be detected after the fact and used to identify monkeys that have been illegally trafficked. 

Why we funded this project

Although this project focuses narrowly on anthropogenic harms in a particular threatened species, we funded it because their approach is interesting and very similar to one we have been interested in applying to study the welfare of stocked fish (i.e., fish raised in a hatchery and then released into the wild) using biological aging methods, another category of putative welfare indicators that integrate stress over time. Between these two funded studies, we are interested to see 1) how welfare indicators for wild and captive environments of varying quality compare and 2) whether hair cortisol from individuals whose environment changed is consistent (at the corresponding points in time) with that of individuals who were only exposed to one environment or the other. We anticipate that the relationship for the latter question is more complex than described, but investigating it will help us learn more about the validity of hair cortisol measurements and the importance of prior experiences in shaping animals’ stress responses.

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The impact of road noise on the welfare of free-living juvenile white-footed mice

Grantee: Michael Sheriff

Institution: University of Massachusetts Dartmouth, United States

Grant amount: $60,000

Grant type: Challenge grants

Focal species: White-footed mice (Peromyscus leucopus)

Conservation status: Least concern

Disciplines: Human-wildlife conflict, animal behavior, population ecology, mammalogy

Research location: United States

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Project summary

This project will examine the impact of road noise on juvenile welfare in white-footed mice in Massachusetts. The project will focus on how road noise impacts the ability of juveniles to respond appropriately to the threat of predation (the most common cause of juvenile small mammal mortality). Preliminary work has shown that experimental manipulation of road noise (played at 62-65dB, which is equivalent to 100m into the forest from a major thoroughfare to Boston, MA) disrupts the normal foraging responses of (adult) small mammals to predation risk, possibly by masking their ability to perceive auditory cues of predators. Perception of predation threat will be experimentally manipulated by auditory playback of owl noises at sites near and far from the highway, paired with controls at the same distances from the highway but without auditory playback. Anxiety-related behaviors will be recorded in juveniles in an open field trap (which they voluntarily enter for feed), and their feces will be studied to assess physiological stress and nutritional status.

Why we funded this project

Road noise has dramatically increased and is potentially a major anthropogenic threat to wild animal welfare, and one which might be easily ameliorated through policy changes (e.g., improved sound barriers). This project is especially interesting because it focuses on a less obvious effect of road noise, potentially increasing the risk of predation by masking predator cues. This becomes even more interesting in the context of growing literature on the “ecology of fear,” sublethal effects of predators on prey behavior. If road noise makes prey unaware of risks, it could actually reduce their chronic stress despite exposing them to greater risk of death. We are excited for this project to explore those issues, although we are prepared for a complex result. Additionally, we wanted to support this PI because of their strong record of engaging students in their research and influencing their career trajectories.

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