Andreas Koenig
Biographic Data
| ID | 627059 |
|---|---|
| NAME | Andreas Koenig |
| GIVEN NAMES | Andreas |
| FAMILY NAME | Koenig |
| SIGNATURE | KOENIG A |
| AFFILIATIONS | Stony Brook University |
| ORCID | 0000-0003-1494-9156 |
| VERIFIED | Yes |
| TOTAL WORKS | 35 |
| TOTAL CITATIONS | 92 |
| AUTHOR COUNT | 35 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1991 |
| LATEST PUBLICATION YEAR | 2024 |
| H-INDEX | 5 |
Consumption of underground storage organs is associated with improved energetic status in a graminivorous primate
Exploratory analysis reveals arthropod consumption in 10 lemur species using DNA metabarcoding
Arthropods (insects, spiders, etc.) can fulfill major nutritional requirements for primates, particularly in terms of proteins, fats, vitamins, and minerals. Yet, for many primate species we know very little about the frequency and importance of arthropod consumption. Traditional methods for arthropod prey identification, such as behavioral observations and fecal dissections, offer limited taxonomic resolution and, as a result, underestimate true…
Behavioral and physiological responses to instability in group membership in wild male woolly monkeys ( Lagothrix lagotricha poeppigii )
In group‐living species, integrating into a new social group after dispersal is an important life history milestone associated with physical and social challenges. Generally, this process seems to be accompanied by heightened glucocorticoid (GC) concentrations; however, most studies of physiological responses to group transfer have been conducted on species with despotic social relationships, where integrating individuals are often targets of fre…
The effect of data provenance on estimates of gestation length in African and Asian colobines
OBJECTIVES: It seems to be commonly accepted that gestation length within the subfamily Colobinae lasts several weeks longer in the African tribe (Colobini) than in the Asian tribe (Presbytini) even though closely related taxa of similar body mass should have similar life histories. Suspecting problems with data provenance to cause the difference, we revisited the published records expecting similar gestation lengths in both tribes if based on ve…
The function of geophagy in Nepal gray langurs: Sodium acquisition rather than detoxification or prevention of acidosis
OBJECTIVES: Geophagy has several hypothesized functions, among them (1) detoxification of plant secondary compounds, for example, tannins, (2) buffering stomach pH to alleviate acidosis caused by high sugar intake, and (3) supplementing the diet with mineral nutrients. We tested these hypotheses in Nepal gray langurs (Semnopithecus schistaceus), a foregut fermenter for which fruits and leaves dominate the diet at different times of the year. MATE…
The importance of protein in leaf selection of folivorous primates
Protein limitation has been considered a key factor in hypotheses on the evolution of life history and animal communities, suggesting that animals should prioritize protein in their food choice. This contrasts with the limited support that food selection studies have provided for such a priority in nonhuman primates, particularly for folivores. Here, we suggest that this discrepancy can be resolved if folivores only need to select for high protei…
Characteristics of alpha males in Nepal gray langurs
In species with strong male-male competition, access to females in multimale-multifemale groups is usually regulated via a dominance hierarchy. The highest ranking (alpha) male often has priority of access and sires most offspring. The alpha male can change in three basic ways: (i) a recent immigrant or a resident challenges and becomes the new alpha; (ii) formation of a new group; (iii) succession-becoming alpha after higher ranking males have l…
Transparency, usability, and reproducibility: Guiding principles for improving comparative databases using primates as examples
Recent decades have seen rapid development of new analytical methods to investigate patterns of interspecific variation. Yet these cutting‐edge statistical analyses often rely on data of questionable origin, varying accuracy, and weak comparability, which seem to have reduced the reproducibility of studies. It is time to improve the transparency of comparative data while also making these improved data more widely available. We, the authors, met …
Dominance relationships in male Nepal gray langurs ( S emnopithecus schistaceus )
OBJECTIVES: Reproductive skew is proposed to link to despotism in dominance hierarchies. While studies illustrating male skew are plentiful, demonstrating the link to despotism is rare. Likewise, it is often unknown which factors (e.g., resource holding potential, age, physical condition) affect a male's dominance rank. Here we investigated correlates of male rank and hierarchy characteristics in Nepal gray langurs (Semnopithecus schistaceus), a …
The meaning of weaning in wild Phayre's leaf monkeys: Last nipple contact, survival, and independence
In primates and other mammals, weaning is an equivocal concept, as is reflected in the numerous ways it is measured: a) first intake of solid food, b) conflict over access to the nipple, c) ability to survive without mother, d) maternal resumption of cycling, or e) the cessation of nipple contact. The lack of a consistent definition means that weaning age, although it falls between gestation (fetal growth) and age at first reproduction (most ener…
The Effects of Group Size and Reproductive Status on Vigilance in Captive C allithrix jacchus
Previous work on mammals and birds has often demonstrated a negative relationship between group size and individual vigilance. However, this relationship has received only weak support in nonhuman primates. This result may be due to the failure to distinguish different forms of vigilance such as antipredatory vigilance and social monitoring. Here, we tested the effects of group size, reproductive status (breeding vs. nonbreeding), and sex on anti…
Hominoid dispersal patterns and human evolution
Recent advances in DNA and isotope analyses have allowed tentative reconstructions of dispersal strategies of Plio-Pleistocene hominins.1, 2 Comparing their findings to dispersal patterns of some extant apes and humans suggested groups of related males and unrelated females in Neandertals indicating patrilocality2 and Pan-like male philopatry in australopiths.1 Here we review the demographic, ethnographic, and genetic evidence of dispersal patter…
Primate life histories and dietary adaptations: A comparison of Asian colobines and Macaques
Primate life histories are strongly influenced by both body and brain mass and are mediated by food availability and perhaps dietary adaptations. It has been suggested that folivorous primates mature and reproduce more slowly than frugivores due to lower basal metabolic rates as well as to greater degrees of arboreality, which can lower mortality and thus fecundity. However, the opposite has also been proposed: faster life histories in folivores …
Selection of sleeping trees in pileated gibbons ( Hylobates pileatus )
Selection and use patterns of sleeping sites in nonhuman primates are suggested to have multiple functions, such as predation avoidance, but they might be further affected by range defense as well as foraging constraints or other factors. Here, we investigate sleeping tree selection by the male and female members of one group of pileated gibbons ( Hylobates pileatus ) at Khao Ang Rue Nai Wildlife Sanctuary, Thailand. Data were collected on 113 ni…
Andreas Paul, 1951-2010
The lost dream of ecological determinism: Time to say goodbye? … Or a White Queen's proposal
“‘What is the matter?’ she [Alice] said, as soon as there was a chance of making herself heard. ‘Have you pricked your finger?’ ‘I haven't pricked it yet ,’ the [White] Queen said, ‘but I soon shall – oh, oh, oh!’” (emphasis as in 1:82 )
How Reliable are Density Estimates for Diurnal Primates
Genital swellings in silvered langurs: What do they indicate
The occurrence of genital swellings was examined in adult female silvered langurs ( Trachypithecus cristatus ). In contrast to the exaggerated swellings found in cercopithecines and apes, genital swellings in silvered langurs are confined to the vulva and the surrounding perineum, but they may nevertheless convey information similar to that of exaggerated swellings (i.e., correlate with the receptive period and fertility). If so, genital swelling…
The importance of ingestion rates for estimating food quality and energy intake
Testing ecological or socioecological models in primatology often requires estimates of individual energy intake. It is a well established fact that the nutrient content (and hence the energy content) of primate food items is highly variable. The second variable in determining primate energy intake, i.e., the ingestion rate, has often been ignored, and few studies have attempted to estimate the relative importance of the two predictors. In the pr…
What Hanuman langur males know about female reproductive status
In species with a high risk of infanticide, a conflict of interest exists between the sexes over the amount of paternity information that is available to males. While females are expected to keep males unaware of their reproductive status in order to confuse paternity, selection should favor those male traits that enhance the males' assessment of female status and consequently of paternity probability. In Hanuman langurs ( Semnopithecus entellus …
How important are affiliation and cooperation? A reply to Sussman et al
Quo Vadis EIP? How Eco‐industrial Parks are Evolving
Versatile Hardware and Software Tools for Educating Students in Power Electronics
A new power electronics laboratory has been constructed at the University of Missouri-Rolla. Key components of the laboratory are a set of custom-designed hardware and software tools. The novel hardware tools include five mobile power electronics testbeds that each contain the semiconductor devices, gate-drive boards, voltage and current sensors, and computer interface connections required to study a wide range of circuit topologies and control t…
Agonistic behavior and dominance relationships in female phayre's leaf monkeys – preliminary results
Socioecological theory suggests a link between the strength of competition for food/safety, rates of agonism, structure of dominance hierarchies, and dispersal among group‐living females. This study presents preliminary data on agonistic behavior and dominance relationships for female Phayre's leaf monkeys ( Trachypithecus phayrei ), a species in which females routinely disperse. Behavioral observations were conducted on two groups (four adult fe…
Competition for Resources and Its Behavioral Consequences Among Female Primates
Competition for Resources and Its Behavioral Consequences Among Female Primates
The meaning of weaning in wild Phayre's leaf monkeys: Last nipple contact, survival, and independence
In primates and other mammals, weaning is an equivocal concept, as is reflected in the numerous ways it is measured: a) first intake of solid food, b) conflict over access to the nipple, c) ability to survive without mother, d) maternal resumption of cycling, or e) the cessation of nipple contact. The lack of a consistent definition means that weaning age, although it falls between gestation (fetal growth) and age at first reproduction (most ener…
Primate life histories and dietary adaptations: A comparison of Asian colobines and Macaques
Primate life histories are strongly influenced by both body and brain mass and are mediated by food availability and perhaps dietary adaptations. It has been suggested that folivorous primates mature and reproduce more slowly than frugivores due to lower basal metabolic rates as well as to greater degrees of arboreality, which can lower mortality and thus fecundity. However, the opposite has also been proposed: faster life histories in folivores …
Hominoid dispersal patterns and human evolution
Recent advances in DNA and isotope analyses have allowed tentative reconstructions of dispersal strategies of Plio-Pleistocene hominins.1, 2 Comparing their findings to dispersal patterns of some extant apes and humans suggested groups of related males and unrelated females in Neandertals indicating patrilocality2 and Pan-like male philopatry in australopiths.1 Here we review the demographic, ethnographic, and genetic evidence of dispersal patter…
How Reliable are Density Estimates for Diurnal Primates
Long-term study of infant-carrying behavior in captive common marmosets (Callithrix jacchus): Effect of nonreproductive helpers on the parents' carrying performance
Social relationships and individual contribution to cooperative behaviour in captive common marmosets (Callithrix jacchus)
Infant carrying in a polygynous group of common marmosets ( Callithrix jacchus )
In a captive group of common marmosets ( Callithrix jacchus ), consisting of six group members and the three infants of the two breeding females, we analyzed participation of all group members in infant carrying, and suckling by the two breeding females. During the first two weeks of the infants' lives, the two breeding females carried their own infant(s) almost exclusively due primarily to the mutual avoidance by the two females. At the beginnin…
Infant survival and number of helpers in captive groups of common marmosets ( Callithrix jacchus )
In a colony of captive marmoset monkeys ( Callithrix jacchus ), the survival rate of infants up to the age of 90 days after birth was analyzed with special reference to the number of members in the group. The number of group members (newborns excluded) varied between two (parents only) and 18 (parents plus non‐reproductive helpers); the number of adult group members varied between two and 15. Five hundred ninety‐two live‐born, parent‐reared infan…
Long-term study of infant-carrying behavior in captive common marmosets (Callithrix jacchus): Effect of nonreproductive helpers on the parents' carrying performance
Effects of familiarity on the behaviour towards intruders in captive common marmosets (Callithrix jacchus)
Group size, composition, and reproductive success in wild common marmosets ( Callithrix jacchus )
Data from published sources about size and composition of wild common marmoset groups ( Callithrix jacchus ) were analyzed to see if the number of juveniles in a group is closely related to the number of other group members. Mean group size was 8.7 members including 4.4 adults (1.8 females, 2.5 males), 2.9 subadults, and 1.4 juveniles. The number of juveniles was significantly positively correlated to the number of adult males. Groups with one or…
Ecology, nutrition, and timing of reproductive events in an Asian primate, the Hanuman langur ( Presbytis entellus )
Ecological conditions, feeding and ranging behaviour as well as physical condition of female Hanuman langurs ( Presbytis entellus ) were studied in order to analyse the major influences on the timing of reproductive events. The langurs inhabited a semi‐evergreen forest dominated by Sal trees ( Skorea robusta ). The climate was dominated by the summer monsoon lasting from May to September. Availability of plant phytophases was markedly seasonal, w…
Visual scanning by common marmosets (Callithrix jacchus): Functional aspects and the specialrrole of adult males
When females should contest for food - testing hypotheses about resource density, distribution, size, and quality with Hanuman langurs ( Presbytis entellus )
Socioecology of Hanuman langurs: The story of their success
Competition for Resources and Its Behavioral Consequences Among Female Primates
Versatile Hardware and Software Tools for Educating Students in Power Electronics
A new power electronics laboratory has been constructed at the University of Missouri-Rolla. Key components of the laboratory are a set of custom-designed hardware and software tools. The novel hardware tools include five mobile power electronics testbeds that each contain the semiconductor devices, gate-drive boards, voltage and current sensors, and computer interface connections required to study a wide range of circuit topologies and control t…
Agonistic behavior and dominance relationships in female phayre's leaf monkeys – preliminary results
Socioecological theory suggests a link between the strength of competition for food/safety, rates of agonism, structure of dominance hierarchies, and dispersal among group‐living females. This study presents preliminary data on agonistic behavior and dominance relationships for female Phayre's leaf monkeys ( Trachypithecus phayrei ), a species in which females routinely disperse. Behavioral observations were conducted on two groups (four adult fe…
Quo Vadis EIP? How Eco‐industrial Parks are Evolving
The importance of ingestion rates for estimating food quality and energy intake
Testing ecological or socioecological models in primatology often requires estimates of individual energy intake. It is a well established fact that the nutrient content (and hence the energy content) of primate food items is highly variable. The second variable in determining primate energy intake, i.e., the ingestion rate, has often been ignored, and few studies have attempted to estimate the relative importance of the two predictors. In the pr…
What Hanuman langur males know about female reproductive status
In species with a high risk of infanticide, a conflict of interest exists between the sexes over the amount of paternity information that is available to males. While females are expected to keep males unaware of their reproductive status in order to confuse paternity, selection should favor those male traits that enhance the males' assessment of female status and consequently of paternity probability. In Hanuman langurs ( Semnopithecus entellus …
How important are affiliation and cooperation? A reply to Sussman et al
Genital swellings in silvered langurs: What do they indicate
The occurrence of genital swellings was examined in adult female silvered langurs ( Trachypithecus cristatus ). In contrast to the exaggerated swellings found in cercopithecines and apes, genital swellings in silvered langurs are confined to the vulva and the surrounding perineum, but they may nevertheless convey information similar to that of exaggerated swellings (i.e., correlate with the receptive period and fertility). If so, genital swelling…
How Reliable are Density Estimates for Diurnal Primates
The lost dream of ecological determinism: Time to say goodbye? … Or a White Queen's proposal
“‘What is the matter?’ she [Alice] said, as soon as there was a chance of making herself heard. ‘Have you pricked your finger?’ ‘I haven't pricked it yet ,’ the [White] Queen said, ‘but I soon shall – oh, oh, oh!’” (emphasis as in 1:82 )
Selection of sleeping trees in pileated gibbons ( Hylobates pileatus )
Selection and use patterns of sleeping sites in nonhuman primates are suggested to have multiple functions, such as predation avoidance, but they might be further affected by range defense as well as foraging constraints or other factors. Here, we investigate sleeping tree selection by the male and female members of one group of pileated gibbons ( Hylobates pileatus ) at Khao Ang Rue Nai Wildlife Sanctuary, Thailand. Data were collected on 113 ni…
Andreas Paul, 1951-2010
Primate life histories and dietary adaptations: A comparison of Asian colobines and Macaques
Primate life histories are strongly influenced by both body and brain mass and are mediated by food availability and perhaps dietary adaptations. It has been suggested that folivorous primates mature and reproduce more slowly than frugivores due to lower basal metabolic rates as well as to greater degrees of arboreality, which can lower mortality and thus fecundity. However, the opposite has also been proposed: faster life histories in folivores …
The Effects of Group Size and Reproductive Status on Vigilance in Captive C allithrix jacchus
Previous work on mammals and birds has often demonstrated a negative relationship between group size and individual vigilance. However, this relationship has received only weak support in nonhuman primates. This result may be due to the failure to distinguish different forms of vigilance such as antipredatory vigilance and social monitoring. Here, we tested the effects of group size, reproductive status (breeding vs. nonbreeding), and sex on anti…
Hominoid dispersal patterns and human evolution
Recent advances in DNA and isotope analyses have allowed tentative reconstructions of dispersal strategies of Plio-Pleistocene hominins.1, 2 Comparing their findings to dispersal patterns of some extant apes and humans suggested groups of related males and unrelated females in Neandertals indicating patrilocality2 and Pan-like male philopatry in australopiths.1 Here we review the demographic, ethnographic, and genetic evidence of dispersal patter…
Primate Behavior and Ecology (33 works) · Biology (30 works) · Ecology (20 works) · Zoology (20 works) · Animal Behavior and Reproduction (19 works) · Demography (16 works) · Animal Vocal Communication and Behavior (14 works) · Population (12 works) · Ecology (11 works) · Psychology (10 works)