bluuebunny/crossref_metadata_2025_split huggingface dataset:
The reproductive status of nonbreeding group members in captive golden lion tamarin social groups
Authors: French Jeffrey A. , Inglett Betty J. , Dethlefs Theresa M. 
Published: June 2005

AbstractReproductive activity is limited to only one female in many species of callitrichid primates (marmosets and tamarins): daughters and subordinate females do not produce offspring. A suppression of ovulatory cyclicity is responsible for the lack of reproductive activity in three species of callitrichids studied to date. This study evaluated the endocrine status of golden lion tamarins (Leontopithecus rosalia) housed as daughters or sons in family groups and of individuals housed in isosexual peer groups. Daughters 17 months of age and older and a subordinate female had high levels of estrogen excretion. Mean levels of estrogen excretion in these females were similar to those of nonpregnant, breeding adult females (17.14 ± 6.82 versus 11.93 ± 6.33 μg/mg creatinine, respectively). Estrogen profiles were similar to those of breeding adult females, with sinusoidal cycles in estrogen excretion. Younger daughters in family groups (10 and 12 months old) showed markedly lower levels of estrogen excretion (0.84 ± 0.58 μg/mg creatinine). Estrogen profiles lacked the sinusoidal nature of cycles in older daughters and breeding females, and elevations in estrogen excretion occurred frequently and remained elevated for 1 or 2 days. Plasma testosterone levels in males varied widely, but mean concentrations did not differ among males housed in different social conditions. These results suggest that older daughters and subordinate females may be capable of expressing normal ovarian function in the presence of a breeding adult female. This finding may account for two unusual observations in the lion tamarin: the high level of female‐female aggression and the presence of groups in the wild with more than one actively breeding female.
Parasites of free‐ranging Cayo Santiago macaques after 46 years of isolation
Authors: File Sharon , Kessler Matt J. 
Published: June 2005

AbstractThree hundred and thirty seven Macaca mulatta from a population that had been isolated on a small island off the coast of Puerto Rico for 46 years were examined for parasites. Anatrichosoma cynamolgi (26%), Strongyloides fuelleborni (54%); Trichuris trichiura (23%); and Balantidium coli (2%) were detected. Toxoplasma antibodies were found in 10% of the sera examined. Milk was examined for Stronglyloides, and blood was examined for microfilariae and protozoa, but no parasites were found in these specimens. The animals in this colony harbored intestinal parasites but were in excellent physical condition, with a high reproductive rate and a low mortality rate. It is concluded that the presence of intestinal and tissue parasites has little measurable effect on the overall health of rhesus in this free‐ranging environment.
A twenty‐year study of long‐term and temporary dominance relations among stumptailed macaques (Macaca arctoides)
Authors: Rhine Ramon J. , Cox Roberta L. , Costello Michael B. 
Published: June 2005

AbstractConsistent individual differences in long‐term dominance are a basic underlying assumption of hypotheses linking dominance and reproductive success. Long‐term and temporary dominance of a colony group of stumptailed macaques was studied for 20 years. There were two variously constituted groups for the first 4 years and a single group for the last 16. Stumptails displayed the matrilineal dominance organization found for several other cercopithecine species. A method was devised to standardize ranks so they could be compared over the years across groups of varying size and composition. No animal maintained the same dominance rank over the entire period of the research or over the last 16 years, but there was considerable consistency over long periods. Although occupants of the male and female alpha positions changed several times, one female was dominant for 18 of the 20 years. She was dominant in 1968, at the start of the study, and at its end in 1988 at which time her 18‐year‐old son was the dominant male. Variation in dominance ranks was greatest among members of mid‐ranking matrilines and least for the lowest ranking. The same female or her son were the lowest ranking animals of their groups in all samples taken over the entire 20 years.
Consumption of cyanogenic bamboo by a newly discovered species of bamboo lemur
Authors: Glander Kenneth E. , Wright Patricia C. , Seigler David S. , Randrianasolo Voara , Randrianasolo Bodovololona 
Published: June 2005

AbstractThree species of bamboo‐eating lemurs were found to be sympatric in the southeastern rain forests of Madagascar. Sympatric species generally differ in habitat utilization or diet, but these three closely related bamboo lemurs lived in the same habitat and all ate bamboo. Behavioral observation revealed that they did select different parts of the bamboo, and chemical analyses confirmed that there was a difference in the secondary compound content present in those selections. The growing tips of Cephalostachyum ef uiguieri selected by the golden bamboo lemur (Hapalemuraureus) contained 15 mg of cyanide per 100 g fresh weight bamboo while the leaves of C. perrieri selected by the gentle bamboo lemur (H. griseus)and the mature culms of C. cf uiguieri selected by the greater bamboolemur (H. simus) did not contain cyanide. Since each individual golden bamboo lemur ate about 500 g of bamboo per day, they daily ingestedabout 12 times the lethal dose of cyanide. The mechanism by which this small primate avoids the acute and chronic symptoms of cyanide poisioning is unknown.
Sex differences in the acquisition of communicative competence by pigtail macaques (Macaca nemestrina)
Authors: Gouzoules Harold , Gouzoules Sarah 
Published: June 2005

AbstractPrevious study of captive pigtail monkeys (Macaca nemestrina) revealed that victims of an attack by a group member employed one of four acoustically different recruitment calls (Gouzoules&Gouzoules: Animal Behaviour 37:383–401, 1989). The calls appear to provide allies with information pertinent to decisions about fight intervention. Each call was associated with an agonistic context distinguished by the relative rank of the opponent and the severity of the attack. Monkeys younger than 3 years of age were significantly less likely to use a contextually appropriate call than were older animals and their calls tended to be acoustically less like the prototype for a given context. Analyses reported on here revealed that, among juveniles, females were more proficient than males in both the proper contextual use and the production of these calls. These findings suggest parallels with human sex differences in the development of communicative competence. The evolutionary origins for these sex differences in macaque vocal development may be based in the different life history patterns males and females exhibit.
Increased cage size does not alter heart rate or behavior in female rhesus monkeys
Authors: Line Scott W. , Morgan Kathleen N. , Markowitz Hal , Strong Sharon 
Published: June 2005

AbstractNewly proposed federal regulations will mandate that singly caged non‐human primates be kept in cages larger than the current minimum standard, or be given 4 hours in an exercise cage per week. In order to evaluate the effectiveness of increasing cage size in improving well‐being, the behavioral and heart rate responses of 10 female rhesus monkeys (Macaca mulatta) to three different cage sizes were measured. With the exception of vocalizations, no significant differences in behavior were obtained. Grunts increased in the largest cage, following the birth of an infant in a cage within view of the test cages. No differences with respect to cage size were found in heart rate or activity level, although there were significant variations at different times of day. We conclude that modest increases in cage size are less likely to enrich the environment of singly caged laboratory primates than are changes in social opportunities or increases in environmental complexity.
Capacitation and the acrosome reaction in squirrel monkey (Saimiri sciureus) spermatozoa evaluated by the chlortetracycline fluorescence assay
Authors: Kholkute S. D. , Lian Ye , Roudebush W. E. , Dukelow W. R. 
Published: June 2005

AbstractCapacitation and the acrosome reaction in squirrel monkey seminal spermatozoa diluted in Tyrode's medium (TALP) and TC‐199 were monitored by a chlortetracycline (CTC) fluorescence assay. Four CTC patterns, similar to those found in human sperm, were readily characterized by fluorescent staining on the heads of the spermatozoa. The appearance of the capacitated (CP) pattern was dependent on the concentration of the bovine serum albumin. Acrosomal loss was observed in a maximum of 15% of the sperm in the populations studied here. Calcium ionophore A23187 (5 μM to 20μM) induced acrosomal loss in 60–70% of capacitated spermatozoa. However in freshly ejaculated sperm incubated under capacitating conditions or in spermatozoa incubated in Ca+ +‐free medium, A23187 failed to induce acrosomal loss. Furthermore, spermatozoa incubated in the presence of seminal plasma or spermatozoa obtained following a 1‐hour “swim‐up” procedure showed an identical timecourse of appearance of the CP pattern, indicating the lack of effect of seminal plasma on capacitation in the squirrel monkey.
Parental behavior and infant development in ruffed lemurs (Varecia variegata) in a northeast Madagascar rain forest
Authors: Morland Hilary Simons 
Published: June 2005

AbstractParental behavior and infant development of black and white ruffed lemurs (Varecia variegata) were studied on Nosy Mangabe Island in northeast Madagascar. Ruffed lemur females produced twins, prepared nests for neonates in the trees, transported infants by mouth, and parked them in the trees. During two consecutive birth seasons, the average birth rate for nine females was 0.58. Two females reproduced in one social group. Lactating females spent most of their time resting with their infants or foraging for food. Infants developed rapidly and were fully mobile by 3–4 months. No female reproduced successfully in 2 consecutive years. In 1988, infant mortality within 3 months of birth was very high (64%). Accidental falls may have been one major cause. Adults of both sexes, including a reproductive female, exhibited alloparental behavior such as guarding infants and nonmaternal nursing. Alloparental care may increase the likelihood of infant survival. Some of these observations are not compatible with the idea that ruffed lemurs live in small pair‐bonded groups, as other researchers have suggested.
Predator recognition in cotton‐top tamarins (Saguinus oedipus)
Authors: Hayes Sheryl L. , Snowdon Charles T. 
Published: June 2005

AbstractCaptive social groups of cotton‐top tamarins (Saguinus oedipus) were presented with inanimate and animate stimuli to determine (1) if the tamarins recognize a snake as a dangerous stimulus and (2) whether the tamarins' response was specific to snakes. Fourteen pairs of tamarins were presented with a live boa constrictor, artificial flowers, and an empty box. Animals visually fixated for a longer period of time and emitted a greater frequency of mild alarm, strong alarm, and mobbing vocalizations during the presentations of the snake than during the presentations of either the flowers or the empty box. However, 97% of the alarm and mobbing vocalizations were emitted from only nine of the 28 individuals. In addition, there was no significant increase in locomotory activity and no significant change in avoidance behavior, as would be expected from reports on wild tamarins responding to snakes. Nine of the 14 pairs of tamarins were presented with a laboratory rat, leaves, and an empty box. The laboratory rat was used to test the animals' response to a moving, non‐food, non‐predatory stimulus. Animals visually fixated for a longer period of time and emitted a greater frequency of strong alarm and mobbing vocalizations during the presentations of the rat than during the presentations of either the leaves or the empty box. Of the 18 tamarins, seven individuals emitted 91% of the alarm and mobbing vocalizations. There was no significant difference between the number of mild alarm, strong alarm, and mobbing vocalizations emitted during the presentations of the snake and during the presentations of the rat. Results of this study suggest that captive cotton‐top tamarins do not demonstrate an alarm response specific to snakes but may simply display fear to moving objects. In addition, the tamarins did not respond to the snake with the degree of behavioral or vocal intensity, as has been reported in wild tamarins.
Subspecific morphological variation in the saddle‐back tamarin (Saguinus fuscicollis)
Authors: Cheverud James M. , Moore Allen J. 
Published: June 2005

AbstractHershkovitz (Living New World, Volume 1. Chicago, University Press of Chicago, 1977, pp. 618–627, 634–666) identified 13 subspecies of Saguinus fuscicollis based on coat color variation on the head, neck, and shoulders. Other morphological differences among the subspecies are unknown. It has been suggested, however, that several of the taxa may be distinct at the specific level. In this report, we examine the level and pattern of facial morphological variation among the subspecific populations to evaluate their taxonomic status.Eleven facial measurements were recorded from the left side of 104 saddle‐back tamarin crania. Significant morphological variation among the subspecies in facial heights and depths was detected with discriminant function analysis. Analyses of morphological differences between subspecies and among individual specimens relative to geographical and evolutionary distances (based on the metachromatic theory) were performed by using quadratic assignment procedures. These analyses indicate an absence of geographically related morphological variation across the species range while phylogenetic relationships are reflected in morphological similarities among groups and individuals. This finding is consistent with the formation of subspecific populations by relatively small founding populations budding off from a larger parent population, invading a new interfluvial basin, and then remaining relatively isolated, as suggested by Hershkovitz (Living New World Monkeys, Volume 1. University of Chicago Press, Chicago, 1977).
Heart rate and social status among male cynomolgus monkeys (Macaca fascicularis) housed in disrupted social groupings
Authors: Kaplan Jay R. , Manuck Stephen B. , Gatsonis Constantine 
Published: June 2005

AbstractThe relationship between social status and telemetrically recorded heart rate (HR) was studied among 29 adult male cynomolgus monkeys (Macaca fascicularis) which had been maintained in six social groups (n = four or five) for 26 months. The membership of each group was reorganized periodically (20 times in 26 months) by shifting monkeys from group to group in a way that maximized each animal's exposure to social strangers. The social behavior of all animals was monitored, via focal sampling, twice per week; social status was based on the outcome of agonistic encounters and was determined every 2 weeks. For four nights on each of two occasions (months 13 and 25 of the experiment), the HRs of all animals were sampled 12 times per hour, 30 seconds per sample between 1800 h and 0900 h. A more limited nocturnal HR sampling was performed during the first month of the experiment. The behavioral observations revealed that, despite the repeated social reorganization, some monkeys were habitually dominant in their groups while others were consistently subordinate. Further, those monkeys falling above the median in dominance status had significantly lower HRs than their subordinate counterparts (104 vs. 117 beats per minuts; P = 0.01). The effect was observed irrespective of the month in which observations were made, and was corroborated by more limited observations made at the beginning of the experiment. Finally, those few monkeys which rose or fell in rank were characterized by inverse changes in HR, supporting the hypothesis that behavioral factors influence HR (rather than visa versa).
Metabolic abnormalities among free‐ranging Macaca mulatta on Cayo Santiago: Comparisons with Macaca mulatta at Sabana Seca
Authors: Howard Charles F. , Kessler Matt J. , Schwartz Susan 
Published: June 2005

AbstractFree‐ranging rhesus macaques (Macaca mulatta) were examined on the island of Cayo Santiago (CS), Puerto Rico, with intravenous glucose tolerance tests (IV‐GTTs). Results were compared to monkeys derived from the island, but subsequently housed in corrals or gang cages at Sabana Seca (SS). Glucose clearance was similar among CS and SS macaques (range 2.99 to 4.50%min); both CS and SS males had significantly greater fasting serum glucose levels (63 ± 1 and 61 ± 2 mg/dl, respectively) than females; concentrations in CS and SS nonpregnant females (49 ± 3 vs. 52 ± 1 mg/dl) were significantly greater than CS and SS pregnant females (38 ± 3 vs. 41 ± 2 mg/dl) at each location. Fasting insulin was significantly less for male CS than for male SS macaques (means of 34 vs. 51 μU/ml); female averages were similar at both locations (range 48 to 61 μU/ml). The acute increment of insulin secretion for CS males was less than for SS males (85 vs. 136 μU/ml) but there were no differences between CS and SS females. The weight and body mass of CS macaques were generally greater than SS macaques. Hyperinsulinemic macaques > 10 years had greater weight and body mass compared to age‐matched controls. Genetics may play a major role in expression of these impairments since the incidence on CS varied from 0 to 54% among the matrilines examined.
Notes on the sexual behavior of the proboscis monkey (Nasalis larvatus)
Authors: Yeager Carey P. 
Published: June 2005

AbstractProboscis monkey (Nasalis larvatus) sexual behavior was studied at the Tanjung Puting National Park in Kalimantan Tengah, Indonesia, for 12 months. Data were collected on one‐male groups and all‐male groups using event sampling for copulations, presents, and same‐sex mounts. Proboscis monkeys follow typical colobine patterns of sexual behavior with females soliciting copulations through head shaking, pout face, and the presentation of the hindquarters. Males appear to be single‐mount ejaculators. Harassment of copulating pairs and female‐female competition for a mate were observed. Same‐sex mounts (female‐female and male‐male) were also observed. Additional data are needed to evaluate their function.
Composition of the diet of lowland gorillas at Lopé in Gabon
Authors: Williamson Elizabeth A. , Tutin Caroline E. G. , Rogers M. Elizabeth , Fernandez Michel 
Published: June 2005

AbstractThis report describes the composition of the diet of lowland gorillas, Gorilla gorilla gorilla, at Lopé in central Gabon. This population inhabits mature evergreen tropical forest and is not habituated to human observers. Data were collected during 6 years of an ongoing long‐term study, from feeding‐trails and by direct observation, but mostly by fecal analysis. Gorillas ate 182 plant foods from 134 species and 36 families. The fruit diet was diverse: 95 species were consumed, most with succulent pulp, and some immature seeds were eaten. Fruit remains were recorded in 98% of dung. Vegetative parts of Aframomum and Marantaceae formed staple foods, as they were abundant, accessible, and available year‐round. Soil and social insects were also ingested; remains of weaver ants were recorded in one third of feces. More foods have been recorded for gorillas at Lopé than elsewhere and this is the most frugivorous population studied so far.
Inanimate environmental enrichment for group‐housed rhesus macaque infants
Authors: Champoux Maribeth , Digregorio Gayle , Schneider Mary L. , Suomi Stephen J. 
Published: June 2005

AbstractThe behavior of peer‐reared infant rhesus macaques raised in enriched and nonenriched housing conditions was examined in order to evaluate the utility and effectiveness of object enrichment in a group housing setting. Environmental enrichment consisted of apparatuses designed to promote motor activity and to provide response‐contingent feedback. Four animals in each condition were tested over a 14‐month period. Behavioral observations were conducted in the home cage and during several test situations specifically designed to assess behavioral and affective responses to novelty and mild stressors. Monkeys in the enriched condition exhibited fewer behavioral and affective signs of disturbance than control infants in all observation conditions.
The relationship of serum estradiol and progesterone concentrations to the enzyme immunoassay measurements of urinary estrone conjugates and immunoreactive pregnanediol‐3‐glucuronide in Macaca mulatta
Authors: Shideler S. E. , Munro C. J. , Tell L. , Owiti G. , Laughlin L. , Chatterton R. , Lasley B. L. 
Published: June 2005

AbstractPaired urine and serum samples from four conceptive and six nonconceptive ovarian cycles of seven adult Macaca mullatta were analyzed by radioimmunoassay (RIA) for circulating estradiol (E2) and progesterone (Po), and urinary estrone conjugates (E1C) and immunoreactive preganediol‐3‐glucuronide (iPDG) using enzyme immunoassay (EIA). Nonconceptive cycles exhibited a fivefold increase in urinary E1C and serum E2 levels from follicular phase levels to the preovulatory peak. Linear correlation between urinary E1C and serum E2 nonconceptive cycle hormone levels was significant (P <0.01, r = 0.69). Luteal phase levels of iPDG and serum Po levels were approximately parallel in nonconceptive cycles. Similarly, conceptive cycle urinary E1C levels and serum E2 measurements had a correlation coefficient that was significant (P<0.01, r = 0.45). Nonconceptive and conceptive cycle iPDG and Po levels were significantly correlated (P = 0.05, r = 0.63, and P<0.01, r = 0.66, respectively). These data demonstrate that EIA measurements of ovarian hormones in daily urine samples can be used to accurately monitor ovarian function and early pregnancy in Macaca mulatta.