Hillard S Kaplan
Biographic Data
| ID | 99801 |
|---|---|
| NAME | Hillard S Kaplan |
| GIVEN NAMES | Hillard S |
| FAMILY NAME | Kaplan |
| SIGNATURE | KAPLAN H S |
| AFFILIATIONS | Hillard S Kaplan, Economic Science Institute, Chapman University, One University Drive, Orange, CA 92866 USA |
| VERIFIED | No |
| TOTAL WORKS | 13 |
| TOTAL CITATIONS | 81 |
| AUTHOR COUNT | 13 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1995 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 4 |
Exceptionally low mortality despite widespread Covid-19 infection among Indigenous Tsimane and Moseten of Bolivia
Cultural transmission vectors of essential knowledge and skills among Tsimane forager-farmers
Humans transmit cultural information to others in a variety of ways that can affect productivity, cultural success, and ultimately fitness. Not all potential transmitters are expected to be equally preferred by learners or equally willing to influence their culture acquisition. Across socioeconomic opportunities and ages in the human life course, costs and benefits to both learners and potential transmitters are expected to vary, affecting rates …
Who helps Tsimane youth
We examine various forms of helping behaviour among Tsimane Amerindians of Bolivia, focusing on the provision of shelter, childcare, food, sickcare, cultural influence and traditional story knowledge. Kin selection theory traditionally explains nepotistic nurturing of youth by closely related kin. However, less attention has been given to understanding the help provided by individuals without close genetic relatedness. To explain who provides var…
Information transmission and the oral tradition
High resting metabolic rate among Amazonian forager‐horticulturalists experiencing high pathogen burden
OBJECTIVES: Resting metabolic rate (RMR) reflects energetic costs of homeostasis and accounts for 60 to 75% of total energy expenditure (TEE). Lean mass and physical activity account for much RMR variability, but the impact of prolonged immune activation from infection on human RMR is unclear in naturalistic settings. We evaluate the effects of infection on mass-corrected RMR among Bolivian forager-horticulturalists, and assess whether RMR declin…
Conflict or congruence? Maternal and infant-centric factors associated with shorter exclusive breastfeeding durations among the Tsimane
Fertility Theory
Skill ontogeny among Tsimane forager‐horticulturalists
OBJECTIVES: We investigate whether age profiles of Tsimane forager-horticulturalists' reported skill development are consistent with predictions derived from life history theory about the timing of productivity and reproduction. Previous studies of forager skill development have often focused on a few abilities (e.g. hunting), and neglected the broad range of skills and services typical of forager economies (e.g. childcare, craft production, musi…
Age-independent increases in male salivary testosterone during horticultural activity among Tsimane forager-farmers
Fatty acid composition in the mature milk of Bolivian forager‐horticulturalists
Breast milk fatty acid (FA) composition varies greatly among individual women, including in percentages of the long-chain polyunsaturated FAs (LCPUFA) 20:4n-6 (arachidonic acid, AA) and 22:6n-3 (docosahexaenoic acid, DHA), which are important for infant neurological development. It has been suggested that owing to wide variation in milk LCPUFA and low DHA in Western diets, standards of milk FA composition should be derived from populations consum…
The emergence of humans
Two striking differences between humans and our closest living relatives, chimpanzees and gorillas, are the size of our brains (larger by a factor of three or four) and our life span (longer by a factor of about two). Our thesis is that these two distinctive features of humans are products of coevolutionary selection. The large human brain is an investment with initial costs and later rewards, which coevolved with increased energy allocations to …
U New Mexico for the Record
Does observed fertility maximize fitness among New Mexican men
Does observed fertility maximize fitness among New Mexican men
Skill ontogeny among Tsimane forager‐horticulturalists
OBJECTIVES: We investigate whether age profiles of Tsimane forager-horticulturalists' reported skill development are consistent with predictions derived from life history theory about the timing of productivity and reproduction. Previous studies of forager skill development have often focused on a few abilities (e.g. hunting), and neglected the broad range of skills and services typical of forager economies (e.g. childcare, craft production, musi…
High resting metabolic rate among Amazonian forager‐horticulturalists experiencing high pathogen burden
OBJECTIVES: Resting metabolic rate (RMR) reflects energetic costs of homeostasis and accounts for 60 to 75% of total energy expenditure (TEE). Lean mass and physical activity account for much RMR variability, but the impact of prolonged immune activation from infection on human RMR is unclear in naturalistic settings. We evaluate the effects of infection on mass-corrected RMR among Bolivian forager-horticulturalists, and assess whether RMR declin…
Conflict or congruence? Maternal and infant-centric factors associated with shorter exclusive breastfeeding durations among the Tsimane
Who helps Tsimane youth
We examine various forms of helping behaviour among Tsimane Amerindians of Bolivia, focusing on the provision of shelter, childcare, food, sickcare, cultural influence and traditional story knowledge. Kin selection theory traditionally explains nepotistic nurturing of youth by closely related kin. However, less attention has been given to understanding the help provided by individuals without close genetic relatedness. To explain who provides var…
Does observed fertility maximize fitness among New Mexican men
U New Mexico for the Record
The emergence of humans
Two striking differences between humans and our closest living relatives, chimpanzees and gorillas, are the size of our brains (larger by a factor of three or four) and our life span (longer by a factor of about two). Our thesis is that these two distinctive features of humans are products of coevolutionary selection. The large human brain is an investment with initial costs and later rewards, which coevolved with increased energy allocations to …
Fatty acid composition in the mature milk of Bolivian forager‐horticulturalists
Breast milk fatty acid (FA) composition varies greatly among individual women, including in percentages of the long-chain polyunsaturated FAs (LCPUFA) 20:4n-6 (arachidonic acid, AA) and 22:6n-3 (docosahexaenoic acid, DHA), which are important for infant neurological development. It has been suggested that owing to wide variation in milk LCPUFA and low DHA in Western diets, standards of milk FA composition should be derived from populations consum…
Age-independent increases in male salivary testosterone during horticultural activity among Tsimane forager-farmers
Fertility Theory
Skill ontogeny among Tsimane forager‐horticulturalists
OBJECTIVES: We investigate whether age profiles of Tsimane forager-horticulturalists' reported skill development are consistent with predictions derived from life history theory about the timing of productivity and reproduction. Previous studies of forager skill development have often focused on a few abilities (e.g. hunting), and neglected the broad range of skills and services typical of forager economies (e.g. childcare, craft production, musi…
High resting metabolic rate among Amazonian forager‐horticulturalists experiencing high pathogen burden
OBJECTIVES: Resting metabolic rate (RMR) reflects energetic costs of homeostasis and accounts for 60 to 75% of total energy expenditure (TEE). Lean mass and physical activity account for much RMR variability, but the impact of prolonged immune activation from infection on human RMR is unclear in naturalistic settings. We evaluate the effects of infection on mass-corrected RMR among Bolivian forager-horticulturalists, and assess whether RMR declin…
Conflict or congruence? Maternal and infant-centric factors associated with shorter exclusive breastfeeding durations among the Tsimane
Information transmission and the oral tradition
Cultural transmission vectors of essential knowledge and skills among Tsimane forager-farmers
Humans transmit cultural information to others in a variety of ways that can affect productivity, cultural success, and ultimately fitness. Not all potential transmitters are expected to be equally preferred by learners or equally willing to influence their culture acquisition. Across socioeconomic opportunities and ages in the human life course, costs and benefits to both learners and potential transmitters are expected to vary, affecting rates …
Who helps Tsimane youth
We examine various forms of helping behaviour among Tsimane Amerindians of Bolivia, focusing on the provision of shelter, childcare, food, sickcare, cultural influence and traditional story knowledge. Kin selection theory traditionally explains nepotistic nurturing of youth by closely related kin. However, less attention has been given to understanding the help provided by individuals without close genetic relatedness. To explain who provides var…
Exceptionally low mortality despite widespread Covid-19 infection among Indigenous Tsimane and Moseten of Bolivia
Population (8 works) · Biology (7 works) · Demography (7 works) · Evolutionary Psychology and Human Behavior (6 works) · Sociology (6 works) · Evolutionary Game Theory and Cooperation (5 works) · Economics (4 works) · Medicine (4 works) · Developmental psychology (3 works) · Ecology (3 works)