Sommer
Dados Biográficos
| ID | 43495 |
|---|---|
| NOME | Sommer |
| SOBRENOME | Sommer |
| ASSINATURA | SOMMER |
| AFILIAÇÕES | University College London |
| ORCID | 0000-0001-6749-3362 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 27 |
| TOTAL DE CITAÇÕES | 58 |
| TOTAL COMO AUTOR | 27 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1987 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2022 |
| ÍNDICE H | 5 |
The Anthropologist as a Primatologist
Population history of chimpanzees introduced to Lake Victoria’s Rubondo Island
Quantitative estimates of glacial refugia for chimpanzees ( Pan troglodytes ) since the Last Interglacial (120,000 BP)
Paleoclimate reconstructions have enhanced our understanding of how past climates have shaped present‐day biodiversity. We hypothesize that the geographic extent of Pleistocene forest refugia and suitable habitat fluctuated significantly in time during the late Quaternary for chimpanzees ( Pan troglodytes ). Using bioclimatic variables representing monthly temperature and precipitation estimates, past human population density data, and an extensi…
Homosexuality, Biosocial Theories of
The biological basis of homosexuality is the subject of ongoing investigations. Researchers in this field explore potential causes through two complementary approaches. On the one hand, there is a focus on mechanisms that generate the trait (proximate causes), with evidence for a multifacetted influence of genes and intrauterine hormones. On the other hand, researchers also consider the functions that might have favored the evolution of homosexua…
Nocturnal activity in wild chimpanzees ( Pan troglodytes )
OBJECTIVES: We investigated occurrences and patterns of terrestrial nocturnal activity in wild chimpanzees (Pan troglodytes) and modelled the influence of various ecological predictors on nocturnal activity. METHODS: Data were extracted from terrestrial camera-trap footage and ecological surveys from 22 chimpanzee study sites participating in the Pan African Programme: The Cultured Chimpanzee. We described videos demonstrating nocturnal activity,…
Sustained myrmecophagy in Nigerian chimpanzees
OBJECTIVE: At some sites across Africa, chimpanzees consume army ants, often aided by plant tools, although consumption frequencies vary greatly. Other populations do not eat these insects at all, despite apparent abundance. The relative importance of this type of myrmecophagy for chimpanzee diet therefore remains unclear. We investigate if army ants constitute a preferred food or a fallback resource for chimpanzees at Gashaka, Nigeria, where arm…
Food begging and sharing in wild bonobos (Pan paniscus)
Why do Mothers Harm their Babies? Evolutionary Perspectives
Young conspecifics are killed in many animal species, often by unrelated males. The role that females — particularly mothers — play in harming infants is often overlooked, as it appears an evolutionary paradox. Life-history theory offers potential explanations, as females are under pressure to time births optimally, produce an optimal number of offspring and secure paternal investment. Furthermore, socio-cultural circumstances across human societ…
Apes finding ants
Some chimpanzee populations prey upon army ants, usually with stick tools. However, how their prey's subterranean nesting and nomadic lifestyle influence the apes' harvesting success is still poorly understood. This is particularly true for chimpanzees (Pan troglodytes ellioti) at Gashaka/Nigeria, which consume army ants (Dorylus rubellus) with much higher frequency than at other sites. We assessed various harvesting and search options theoretica…
Molecular diversity of entodiniomorphid ciliate Troglodytella abrassarti and its coevolution with chimpanzees
The entodiniomorphid ciliate Troglodytella abrassarti is a colonic mutualist of great apes. Its host specificity makes it a suitable model for studies of primate evolution. We explored molecular diversity of T. abrassarti with regard to large geographical distribution and taxonomic diversity of its most common host, the chimpanzee. We found a very low diversification of T. abrassarti in chimpanzees across Africa. Distribution of two types of T. a…
Visual depictions of female genitalia differ depending on source
Very little research has attempted to describe normal human variation in female genitalia, and no studies have compared the visual images that women might use in constructing their ideas of average and acceptable genital morphology to see if there are any systematic differences. The objective of the present work was to determine if visual depictions of the vulva differed according to their source so as to alert medical professionals and their pat…
Andreas Paul, 1951-2010
Living on the edge
Baboons are the most successful and ubiquitous African primates, renowned for their behavioral and reproductive flexibility, which enable them to inhabit a wide variety of habitat types. Owing to a number of long‐term field studies, comparative behavioral, developmental, demographic, and life‐history data are available from several populations, but study sites show a heavy bias toward South and East African savannahs, with little research in West…
Leaf-swallowing in Nigerian chimpanzees
Subsistence Technology of Nigerian Chimpanzees
Play in chimpanzees of the Arnhem Zoo
Grooming site preferences in wild white-handed gibbons (Hylobates lar)
Weaving a tight social net
Father-son recognition in hanuman langurs (Presbytis entellus)
Cycles, sexuality, and conception in free‐ranging langurs ( Presbytis entellus )
Reproductive parameters and sexual behavior of free‐ranging Hanuman langurs ( Presbytis entellus ) were studied over a 13‐year period at Jodhpur, India in a population that breeds throughout the year. Long‐term monitoring of individually identified females living in one‐male‐multi‐female troops revealed a mean cycle length of 24.1 days (n = 113), a mean gestation of 200.3 days (n = 31), menarche at 29.0 months (n = 10), first conception at 35.0 m…
Dominance, age, and reproductive success in free-ranging female hanuman langurs (Presbytis entellus)
Male reproductive success in harem troops of hanuman langurs (Presbytis entellus)
Referate
Referate
Male competition and coalitions in langurs (Presbytis entellus) at Jodhpur, Rajasthan, India
Subsistence Technology of Nigerian Chimpanzees
Weaving a tight social net
Male reproductive success in harem troops of hanuman langurs (Presbytis entellus)
Abortions in free ranging Hanuman langurs (Presbytis entellus) — a male induced strategy
Nocturnal activity in wild chimpanzees ( Pan troglodytes )
OBJECTIVES: We investigated occurrences and patterns of terrestrial nocturnal activity in wild chimpanzees (Pan troglodytes) and modelled the influence of various ecological predictors on nocturnal activity. METHODS: Data were extracted from terrestrial camera-trap footage and ecological surveys from 22 chimpanzee study sites participating in the Pan African Programme: The Cultured Chimpanzee. We described videos demonstrating nocturnal activity,…
Male competition and coalitions in langurs (Presbytis entellus) at Jodhpur, Rajasthan, India
Visual depictions of female genitalia differ depending on source
Very little research has attempted to describe normal human variation in female genitalia, and no studies have compared the visual images that women might use in constructing their ideas of average and acceptable genital morphology to see if there are any systematic differences. The objective of the present work was to determine if visual depictions of the vulva differed according to their source so as to alert medical professionals and their pat…
Sustained myrmecophagy in Nigerian chimpanzees
OBJECTIVE: At some sites across Africa, chimpanzees consume army ants, often aided by plant tools, although consumption frequencies vary greatly. Other populations do not eat these insects at all, despite apparent abundance. The relative importance of this type of myrmecophagy for chimpanzee diet therefore remains unclear. We investigate if army ants constitute a preferred food or a fallback resource for chimpanzees at Gashaka, Nigeria, where arm…
Infanticide among free-ranging langurs (Presbytis entellus) at jodhpur (Rajasthan/India)
Male competition and coalitions in langurs (Presbytis entellus) at Jodhpur, Rajasthan, India
Abortions in free ranging Hanuman langurs (Presbytis entellus) — a male induced strategy
Male reproductive success in harem troops of hanuman langurs (Presbytis entellus)
Referate
Referate
Dominance, age, and reproductive success in free-ranging female hanuman langurs (Presbytis entellus)
Cycles, sexuality, and conception in free‐ranging langurs ( Presbytis entellus )
Reproductive parameters and sexual behavior of free‐ranging Hanuman langurs ( Presbytis entellus ) were studied over a 13‐year period at Jodhpur, India in a population that breeds throughout the year. Long‐term monitoring of individually identified females living in one‐male‐multi‐female troops revealed a mean cycle length of 24.1 days (n = 113), a mean gestation of 200.3 days (n = 31), menarche at 29.0 months (n = 10), first conception at 35.0 m…
Father-son recognition in hanuman langurs (Presbytis entellus)
Grooming site preferences in wild white-handed gibbons (Hylobates lar)
Weaving a tight social net
Play in chimpanzees of the Arnhem Zoo
Leaf-swallowing in Nigerian chimpanzees
Subsistence Technology of Nigerian Chimpanzees
Living on the edge
Baboons are the most successful and ubiquitous African primates, renowned for their behavioral and reproductive flexibility, which enable them to inhabit a wide variety of habitat types. Owing to a number of long‐term field studies, comparative behavioral, developmental, demographic, and life‐history data are available from several populations, but study sites show a heavy bias toward South and East African savannahs, with little research in West…
Visual depictions of female genitalia differ depending on source
Very little research has attempted to describe normal human variation in female genitalia, and no studies have compared the visual images that women might use in constructing their ideas of average and acceptable genital morphology to see if there are any systematic differences. The objective of the present work was to determine if visual depictions of the vulva differed according to their source so as to alert medical professionals and their pat…
Andreas Paul, 1951-2010
Molecular diversity of entodiniomorphid ciliate Troglodytella abrassarti and its coevolution with chimpanzees
The entodiniomorphid ciliate Troglodytella abrassarti is a colonic mutualist of great apes. Its host specificity makes it a suitable model for studies of primate evolution. We explored molecular diversity of T. abrassarti with regard to large geographical distribution and taxonomic diversity of its most common host, the chimpanzee. We found a very low diversification of T. abrassarti in chimpanzees across Africa. Distribution of two types of T. a…
Apes finding ants
Some chimpanzee populations prey upon army ants, usually with stick tools. However, how their prey's subterranean nesting and nomadic lifestyle influence the apes' harvesting success is still poorly understood. This is particularly true for chimpanzees (Pan troglodytes ellioti) at Gashaka/Nigeria, which consume army ants (Dorylus rubellus) with much higher frequency than at other sites. We assessed various harvesting and search options theoretica…
Food begging and sharing in wild bonobos (Pan paniscus)
Why do Mothers Harm their Babies? Evolutionary Perspectives
Young conspecifics are killed in many animal species, often by unrelated males. The role that females — particularly mothers — play in harming infants is often overlooked, as it appears an evolutionary paradox. Life-history theory offers potential explanations, as females are under pressure to time births optimally, produce an optimal number of offspring and secure paternal investment. Furthermore, socio-cultural circumstances across human societ…
Sustained myrmecophagy in Nigerian chimpanzees
OBJECTIVE: At some sites across Africa, chimpanzees consume army ants, often aided by plant tools, although consumption frequencies vary greatly. Other populations do not eat these insects at all, despite apparent abundance. The relative importance of this type of myrmecophagy for chimpanzee diet therefore remains unclear. We investigate if army ants constitute a preferred food or a fallback resource for chimpanzees at Gashaka, Nigeria, where arm…
Homosexuality, Biosocial Theories of
The biological basis of homosexuality is the subject of ongoing investigations. Researchers in this field explore potential causes through two complementary approaches. On the one hand, there is a focus on mechanisms that generate the trait (proximate causes), with evidence for a multifacetted influence of genes and intrauterine hormones. On the other hand, researchers also consider the functions that might have favored the evolution of homosexua…
Nocturnal activity in wild chimpanzees ( Pan troglodytes )
OBJECTIVES: We investigated occurrences and patterns of terrestrial nocturnal activity in wild chimpanzees (Pan troglodytes) and modelled the influence of various ecological predictors on nocturnal activity. METHODS: Data were extracted from terrestrial camera-trap footage and ecological surveys from 22 chimpanzee study sites participating in the Pan African Programme: The Cultured Chimpanzee. We described videos demonstrating nocturnal activity,…
Population history of chimpanzees introduced to Lake Victoria’s Rubondo Island
Biology (23 obras) · Primate Behavior and Ecology (19 obras) · Demography (15 obras) · Zoology (14 obras) · Animal ecology (11 obras) · Ecology (11 obras) · Animal Behavior and Reproduction (10 obras) · Psychology (10 obras) · Population (9 obras) · Sociology (8 obras)