Associations between faecal chemical pollutants and hormones in primates inhabiting Kibale National Park, Uganda

Steiniche, Tessa; Wang, Shaorui; Chester, Emily M.; Mutegeki, Richard; Rothman, Jessica E.; Wrangham, Richard W.; Chapman, Colin A.; Venier, Marta; Wasserman, Michael D.

doi:10.1098/rsbl.2023.0005

Cited by 7 publications

(1 citation statement)

References 55 publications

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“…In the La Selva population, the number of males within a group ranged from 1 to 4, so males that live in groups with other males may have larger testes than males that do not. Third, exposure to endocrine‐active chemicals, whether dietary or anthropogenic, could affect morphological development and final size through direct effects on hormone receptors or indirectly through altering endogenous hormone levels (Steiniche et al, 2023; Wasserman et al, 2012; Wasserman, Milton, et al, 2013). In a previous report by Wang et al, (2019, 2020), pesticides with androgen antagonistic properties were detected in both air samples as well as the fecal samples of mantled howler monkeys in La Selva, Costa Rica.…”

Section: Comparison and Critiquementioning

confidence: 99%

Measuring mantled howler monkey (Alouatta palliata) testes via parallel laser photogrammetry: Expanding the use of noninvasive methods

Ehrie,

Iruri‐Tucker,

Lord

et al. 2024

American J Primatol

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Parallel laser photogrammetry (PLP), which consists of attaching two or three parallel laser beams at a known inter‐beam distance to a camera, can be used to collect morphological measurements of organisms noninvasively. The lasers project onto the photo being taken, and because the inter‐beam distance is known, they act as a scale for image analysis programs like ImageJ. Traditionally, this method has been used to measure larger morphological traits (e.g., limb length, crown‐rump length) to serve as proxies for overall body size, whereas applications to smaller anatomical features remain limited. To that end, we used PLP to measure the testes of 18 free‐living mantled howler monkeys (Alouatta palliata) at La Selva Biological Station, Costa Rica. We tested whether this method could reliably measure this relatively small and globular morphology, and whether it could detect differences among individuals. We tested reliability in three ways: within‐photo (coefficient of variation [CV] = 4.7%), between‐photo (CV = 5.5%), and interobserver (intraclass correlation = 0.92). We found an average volume of 36.2 cm3 and a range of 16.4–54.4 cm3, indicating variation in testes size between individuals. Furthermore, these sizes are consistent with a previous study that collected measurements by hand, suggesting that PLP is a useful method for making noninvasive measurements of testes.

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Section: Comparison and Critiquementioning

confidence: 99%

Measuring mantled howler monkey (Alouatta palliata) testes via parallel laser photogrammetry: Expanding the use of noninvasive methods

Ehrie,

Iruri‐Tucker,

Lord

et al. 2024

American J Primatol

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Fifty+ years of primate research illustrates complex drivers of abundance and increasing primate numbers

Chapman,

Gogarten,

Golooba

et al. 2023

American J Primatol

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Many primate populations are threatened by human actions and a central tool used for their protection is establishing protected areas. However, even if populations in such areas are protected from hunting and deforestation, they still may be threatened by factors such as climate change and its cascading impacts on habitat quality and disease dynamics. Here we provide a long‐term and geographically wide‐spread population assessment of the five common diurnal primates of Kibale National Park, Uganda. Over 7 year‐long or longer census efforts that spanned 52 years, our team walked 1466 km, and recorded 480 monkey groups. Populations were generally relatively stable with a few exceptions, for which no apparent causative factors could be identified. This stability is unexpected as many ecological changes documented over the last 34+ years (e.g., decreasing food abundance and quality) were predicted to have negative impacts. Populations of some species declined at some sites but increased at others. This highlights the need for large, protected areas so that declines in particular areas are countered by gains in others. Kibale has large areas of regenerating forest and this most recent survey revealed that after 20+ years, forest regeneration in many of these areas appears sufficient to sustain sizeable primate populations, except for blue monkeys that have not colonized these areas. Indeed, the average primate abundance in the regenerating forest was only 8.1% lower than in neighboring old‐growth forest. Thus, park‐wide primate abundance has likely increased, despite many pressures on the park having risen; however, some areas in the park remain to be assessed. Our study suggests that the restoration, patrolling, and community outreach efforts of the Uganda Wildlife Authority and their partners have contributed significantly to protecting the park and its animals.

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Primate population dynamics in Ngogo, Kibale National Park, Uganda, over nearly five decades

Chapman,

Angedakin,

Butynski

et al. 2023

Primates

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Associations between faecal chemical pollutants and hormones in primates inhabiting Kibale National Park, Uganda

Cited by 7 publications

References 55 publications

Measuring mantled howler monkey (Alouatta palliata) testes via parallel laser photogrammetry: Expanding the use of noninvasive methods

Measuring mantled howler monkey (Alouatta palliata) testes via parallel laser photogrammetry: Expanding the use of noninvasive methods

Fifty+ years of primate research illustrates complex drivers of abundance and increasing primate numbers

Primate population dynamics in Ngogo, Kibale National Park, Uganda, over nearly five decades

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