Parallel lasers and digital photography to estimate limb size of chimpanzees (Pan troglodytes) at Ngogo, Kibale National Park, Uganda

Sandel, Aaron A.; Derby, Riley N; Chesterman, Nathan; McNamara, Allison; Dudas, Madelynne M; Rawat, Ishita

doi:10.1007/s10329-022-00982-6

Cited by 5 publications

(6 citation statements)

References 35 publications

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“…New innovations in laser photogrammetry are important in decreasing human error (Richardson et al, 2022) and increasing method feasibility. We feel that transparency regarding laser alignment issues is both helpful for future photogrammetry studies, and is something that has been under‐reported in past publications (but see Sandel et al, 2022). Our preliminary results demonstrate that laser photogrammetry, with this new accessible design, can be used with wild Bornean orangutans, with the caveat that an extra step must be taken to recheck the laser separation.…”

Section: Discussionmentioning

confidence: 89%

“…An array of photogrammetry studies (both laser and non-laser) have measured body size in wild terrestrial primates. These include gorillas (Breuer et al, 2007;Caillaud et al, 2008;Galbany et al, 2016Galbany et al, , 2017Wright et al, 2019Wright et al, , 2020, macaques (Jadejaroen et al, 2015;Kurita et al, 2012), baboons (Domb & Pagel, 2001), chimpanzees (Emery & Whitten, 2003;Sandel et al, 2022), and geladas (Lu et al, 2016). To our knowledge, laser photogrammetry has only been used twice to estimate growth trajectories in wild terrestrial primates: cross-sectionally in gorillas (Galbany et al, 2017) and cross-sectionally/longitudinally in geladas (Lu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Application of a parallel laser apparatus to measure forearms and flanges of wild Bornean orangutans (Pongo pygmaeus wurmbii)

Brown

Laman

Kane

et al. 2022

American J Primatol

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We constructed a parallel laser photogrammetry apparatus constructed from commercially available parts, and measured forearm lengths and flange widths of 16 wild Bornean orangutans. Our objectives were to validate our method and apparatus, discuss issues encountered, and construct preliminary growth curves.For adult males, we also compared flange width to forearm length as a way to investigate the relationship between body size and flange development. We used a camera cage around a DSLR camera, on top of which we attached two parallel green lasers. We estimated error with repeatability, accuracy, and interobserver reliability measures, and measured forearm lengths in three different ways to see which was most consistent. The longest forearm measure was the most repeatable (CV = 1.64%), and was similar to flange repeatability (3.50%). Accuracy measurements of a known object were high (error = 0.25%), and Interobserver discrepancy low (3.74%). Laser spacing increased with distance to the subject, but we corrected for this using calibration photos after each session. We transparently discuss the issues we encountered with the aim that this accessible method can help expand the use of laser photogrammetry. Preliminary measurements show that male flange widths and forearm length do not reliably increase in tandem, and that female growth plateaus at around the age at first birth (15 years old). We conclude with suggested improvements to the apparatus and method to ensure the lasers remain parallel.

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Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Application of a parallel laser apparatus to measure forearms and flanges of wild Bornean orangutans (Pongo pygmaeus wurmbii)

Brown

Laman

Kane

et al. 2022

American J Primatol

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“…We also use video and laser photogrammetry to non-invasively measure body size and growth (e.g. Sandel et al, 2022 ) and can extract DNA from feces to determine genetic relationships between individuals (e.g. Vigilant et al, 2001 ).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, however, there has been a rapidly emerging expansion in understanding adolescence as many chimpanzee field sites have collected longitudinal data on individuals from birth through adulthood, capturing adolescence as well as other hormonal and behavioral transitions during development (e.g., Walker et al, 2018 ; Sabbi et al, 2020 ; Enigk et al, 2020 ; Bründl et al, 2021 ). From these recent studies, including our own nearly decade-long study of adolescent male chimpanzees at Ngogo in Kibale National Park, Uganda (and recent field research on wild bonobos), we are advancing understanding of the key social features of this period ( Reddy et al, 2021 , Reddy and Mitani, 2019 , Reddy and Mitani, 2020 , Reddy and Sandel, 2020 , Sandel et al, 2017 , Sandel et al, 2020 , Sandel et al, 2022 ; Reddy & Surbeck, unpublished data).…”

Section: Introductionmentioning

confidence: 99%

Puberty initiates a unique stage of social learning and development prior to adulthood: Insights from studies of adolescence in wild chimpanzees

Reddy

Sandel

Dahl

2022

Developmental Cognitive Neuroscience

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“…PLP is a method that combines digital photography with the use of parallel lasers, by which body size measurements of wild animals can be determined. Morphometric measures have been obtained with PLP from marine mammals (e.g., killer whales, Orcinus orca [Durban & Parsons, 2006]), ungulates (e.g., Alpine ibex, Capra ibex [Bergeron, 2007]), and primates (e.g., chimpanzees, Pan troglodytes [Sandel et al, 2022]; western gorillas, Gorilla gorilla gorilla [Galbany et al, 2016]; mountain gorillas, Gorilla beringei beringei [Galbany et al, 2017;Richardson et al, 2022]; yellow baboons, Papio cynocephalus [Richardson et al, 2022]; Assamese macaques, Macaca assamensis [Anzà et al, 2022]; red colobus monkeys, Procolobus rufomitratus [Rothman et al, 2008]; geladas, Theropitecus gelada [Lu et al, 2016]; mantled howler monkeys, Alouatta palliata [Barrickman et al, 2015]). PLP is gaining popularity for measuring body size in wild animals since it is non-expensive, allows to obtain large amounts of data, and, importantly, is a non-invasive method that does not require anaesthesia or animal manipulation.…”

Section: Parallel Laser Photogrammetry and Collection Of Arm-length M...mentioning

confidence: 99%

Mother-infant relationships in wild Guinea baboons (Papio papio)

Diego¹

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During infancy, primates are heavily dependent on their mothers for nursing, transport, and thermoregulation, but also benefit from associating with their mothers for protection and social support. Furthermore, the mother acts as a role model for social learning, facilitates the interaction with the physical environment and the integration into a broader social network. The repeated interactions and reciprocity between mother and infant, along with the time that they spend together, lead to the formation of the mother-infant bond, which is typically recognised as the strongest social bond in the life of primates. The relationship between mothers and infants is dynamic, and they typically spend most of the time in contact and in close proximity just after infants have been born, and mothers frequently nurse and carry their infants, but soon enough time in contact, carrying, and nursing progressively decreases, and proximity increases as mother and infant move along infancy.Weaning is a period typically marked by behaviours of maternal rejection and increase of distance between mother and infant promoted by the mother. By the end of infancy, individuals will be independent from their mothers, and will therefore be able to move and feed by themselves. Even though the mother-infant dependency decreases as infancy progresses, not all mothers behave in the same way towards their infants. The individual variation in maternal care is known as mothering style, and it can have marked differences in the fate of infants' development and survival. Generally, mothers that are more protective produce infants that have higher survival rates and grow faster, and infants of rejecting mothers have lower survival and grow slower, but reach independence earlier.The aim of this thesis was to investigate the mother-infant relationships in wild Guinea baboons living in the Niokolo-Koba National Park in Senegal. Guinea baboons live in a multi-level social organisation, with "units" at their base, several units forming "parties", and several parties grouping to form "gangs". Guinea baboons form strong social bonds with other males, have low levels of aggression, and show high spatial tolerance. Dispersal is female-biased, and even though females form linear and steep dominance hierarchies at the unit level, rank does not depend on kin. As a consequence of females transferring to other units, parties, or gangs, offspring might be left behind if a mother decides to disperse. Altogether, along with the fact that Guinea baboons live in a tolerant social system with regards to their social relationships, make Guinea baboons an interesting species to study mother-infant relationships. Summary 2In chapter 2 I provide a description of the behaviours between mothers and infants throughout infancy. I show that, similar to all primates, mothers and infants spend most of their time in contact and proximity in the early stages of infancy, and these behaviours, along with carry and nipple contact, decrease over time. Other behaviours, however, are very...

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Parallel lasers and digital photography to estimate limb size of chimpanzees (Pan troglodytes) at Ngogo, Kibale National Park, Uganda

Cited by 5 publications

References 35 publications

Application of a parallel laser apparatus to measure forearms and flanges of wild Bornean orangutans (Pongo pygmaeus wurmbii)

Application of a parallel laser apparatus to measure forearms and flanges of wild Bornean orangutans (Pongo pygmaeus wurmbii)

Puberty initiates a unique stage of social learning and development prior to adulthood: Insights from studies of adolescence in wild chimpanzees

Mother-infant relationships in wild Guinea baboons (Papio papio)

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