Samuel K Wasser
Biographic Data
| ID | 629541 |
|---|---|
| NAME | Samuel K Wasser |
| GIVEN NAMES | Samuel K |
| FAMILY NAME | Wasser |
| SIGNATURE | WASSER S K |
| AFFILIATIONS | University of Washington |
| ORCID | 0000-0002-2678-1904 |
| VERIFIED | Yes |
| TOTAL WORKS | 13 |
| TOTAL CITATIONS | 8 |
| WORKS AS AUTHOR | 13 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1983 |
| LATEST PUBLICATION YEAR | 2022 |
| H-INDEX | 2 |
Elephant genotypes reveal the size and connectivity of transnational ivory traffickers
Lifetime reproductive success, longevity, and reproductive life history of female yellow baboons (Papio cynocephalus)of Mikumi National Park, Tanzania
The relationship between longevity and lifetime reproductive success (LRS) was studied in free-ranging female baboons of Mikumi National Park, Tanzania. A severe population decline occurred between the 12th and 20th years of the study. The total sample consisted of 72 females born and reaching adulthood before the start of the population decline. There were 27 females who were adult at the start of the study and 45 who became adult within the 12 …
Validity of an estimator of reproductive success
Lifetime reproductive success is a major component of individual fitness and a central dependent variable for the study of natural selection. For long-lived animals, such as apes or baboons, assessment of lifetime reproductive success requires observations of identified individuals in continuous, long-term studies from which it is difficult and often impossible to obtain an adequate sample of necessary reproductive and survival data. This situati…
Validity of an estimator of reproductive success
Lifetime reproductive success is a major component of individual fitness and a central dependent variable for the study of natural selection. For long-lived animals, such as apes or baboons, assessment of lifetime reproductive success requires observations of identified individuals in continuous, long-term studies from which it is difficult and often impossible to obtain an adequate sample of necessary reproductive and survival data. This situati…
Environmental variation and developmental rate among free ranging yellow baboons ( Papio cynocephalus )
Behavioral development was observed for the first 3 months of life on 18 infants from three troops of yellow balloons ( Papio cynocephalus ) in Mikumi National Park, Tanzania. Developmental rates were determined for each subject on six major behaviors using the slope from regression equations performed on developmental functions changes in behavior with age. These slopes were examined statistically for associations with social and physical variab…
Psychosocial stress and infertility
Secondary sex ratio and maternal dominance rank among wild yellow baboons ( Papio cynocephalus ) of Mikumi National Park, Tanzania
The Trivers and Willard model predicts that offspring of dominant mothers will be biased toward males and offspring of subordinate mothers towards females, whereas a local‐resource‐competition hypothesis predicts the reverse. Available data bearing upon these alternative predictions are inconsistent. It has been suggested that the local‐resource‐competition hypothesis will predominate when resources are scarce, and the Trivers‐Willard hypothesis …
Infertility, abortion, and biotechnology
Forthcoming in American Journal of Primatology
Eight‐year study of social and ecological correlates of mortality among immature baboons of Mikumi National Park, Tanzania
The Cox Proportional Hazards Regression Model was used to examine ecological and sociodemographic correlates of mortality among 164 immature yellow baboons born over an 8‐year period at Mikumi National Park, Tanzania. Ecological correlates were derived from seasonal rainfall. Mortality was lowest for immatures born during the late rainy season, when it was likely that nourishment for pregnant and lactating females was greatest. High mortality was…
Proximate and ultimate causes of reproductive suppression among female yellow baboons at Mikumi National Park, Tanzania
Attack coalitions, whereby two or more individuals attack another animal simultaneously, were studied in 53 sexually mature female baboons from one small and two large troops at Mikumi National Park, Tanzania. For 14 months, three observers recorded coalition behavior throughout the day, using focal group sampling on a behavior‐dependent basis. Coalition rates were considerably greater in the two large troops than in the small troop, and primaril…
Measurement of excreted steroids in Macaca nemestrina
A practical method for the quantitative measurement of the estrogenic steroid estradiol‐17β in the feces of pigtailed macaques ( Macaca nemestrina ) is described. The method, which includes homogenization, filtration, ether extraction, and sephadex purification, produces an 85.3% recovery of 3H‐estradiol. Comparable recovery of 3H‐progesterone (64.1%) and 3H‐testoster‐one (67.9%) is also obtained. Estradiol, measured by radioimmunoassay methodolo…
Reproductive Suppression Among Female Mammals
Female mammals experience a very high and often unappreciated rate of reproductive failure. Among human pregnancies alone, over 50 per cent fail between conception and parturition, and the majority of these failures are unexplained. These findings present important problems for evolutionary theory as well as for health care practices. This paper addresses these high rates of reproductive failure among mammals, by extending the work of a number of…
Reproductive Suppression Among Female Mammals
Female mammals experience a very high and often unappreciated rate of reproductive failure. Among human pregnancies alone, over 50 per cent fail between conception and parturition, and the majority of these failures are unexplained. These findings present important problems for evolutionary theory as well as for health care practices. This paper addresses these high rates of reproductive failure among mammals, by extending the work of a number of…
Measurement of excreted steroids in Macaca nemestrina
A practical method for the quantitative measurement of the estrogenic steroid estradiol‐17β in the feces of pigtailed macaques ( Macaca nemestrina ) is described. The method, which includes homogenization, filtration, ether extraction, and sephadex purification, produces an 85.3% recovery of 3H‐estradiol. Comparable recovery of 3H‐progesterone (64.1%) and 3H‐testoster‐one (67.9%) is also obtained. Estradiol, measured by radioimmunoassay methodolo…
Forthcoming in American Journal of Primatology
Eight‐year study of social and ecological correlates of mortality among immature baboons of Mikumi National Park, Tanzania
The Cox Proportional Hazards Regression Model was used to examine ecological and sociodemographic correlates of mortality among 164 immature yellow baboons born over an 8‐year period at Mikumi National Park, Tanzania. Ecological correlates were derived from seasonal rainfall. Mortality was lowest for immatures born during the late rainy season, when it was likely that nourishment for pregnant and lactating females was greatest. High mortality was…
Proximate and ultimate causes of reproductive suppression among female yellow baboons at Mikumi National Park, Tanzania
Attack coalitions, whereby two or more individuals attack another animal simultaneously, were studied in 53 sexually mature female baboons from one small and two large troops at Mikumi National Park, Tanzania. For 14 months, three observers recorded coalition behavior throughout the day, using focal group sampling on a behavior‐dependent basis. Coalition rates were considerably greater in the two large troops than in the small troop, and primaril…
Infertility, abortion, and biotechnology
Secondary sex ratio and maternal dominance rank among wild yellow baboons ( Papio cynocephalus ) of Mikumi National Park, Tanzania
The Trivers and Willard model predicts that offspring of dominant mothers will be biased toward males and offspring of subordinate mothers towards females, whereas a local‐resource‐competition hypothesis predicts the reverse. Available data bearing upon these alternative predictions are inconsistent. It has been suggested that the local‐resource‐competition hypothesis will predominate when resources are scarce, and the Trivers‐Willard hypothesis …
Psychosocial stress and infertility
Environmental variation and developmental rate among free ranging yellow baboons ( Papio cynocephalus )
Behavioral development was observed for the first 3 months of life on 18 infants from three troops of yellow balloons ( Papio cynocephalus ) in Mikumi National Park, Tanzania. Developmental rates were determined for each subject on six major behaviors using the slope from regression equations performed on developmental functions changes in behavior with age. These slopes were examined statistically for associations with social and physical variab…
Validity of an estimator of reproductive success
Lifetime reproductive success is a major component of individual fitness and a central dependent variable for the study of natural selection. For long-lived animals, such as apes or baboons, assessment of lifetime reproductive success requires observations of identified individuals in continuous, long-term studies from which it is difficult and often impossible to obtain an adequate sample of necessary reproductive and survival data. This situati…
Validity of an estimator of reproductive success
Lifetime reproductive success is a major component of individual fitness and a central dependent variable for the study of natural selection. For long-lived animals, such as apes or baboons, assessment of lifetime reproductive success requires observations of identified individuals in continuous, long-term studies from which it is difficult and often impossible to obtain an adequate sample of necessary reproductive and survival data. This situati…
Lifetime reproductive success, longevity, and reproductive life history of female yellow baboons (Papio cynocephalus)of Mikumi National Park, Tanzania
The relationship between longevity and lifetime reproductive success (LRS) was studied in free-ranging female baboons of Mikumi National Park, Tanzania. A severe population decline occurred between the 12th and 20th years of the study. The total sample consisted of 72 females born and reaching adulthood before the start of the population decline. There were 27 females who were adult at the start of the study and 45 who became adult within the 12 …
Elephant genotypes reveal the size and connectivity of transnational ivory traffickers
Biology (12 works) · Animal Behavior and Reproduction (9 works) · Primate Behavior and Ecology (8 works) · Demography (7 works) · Population (7 works) · Pregnancy (7 works) · Ecology (5 works) · Geography (5 works) · Offspring (5 works) · Wildlife Ecology and Conservation (5 works)