Jacob C Dunn

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Little is known about how resource limitation affects the feeding ecology of primates in forest fragments. Here, we describe seasonal variation in the diet and feeding effort of 2 groups (RH and RC3) of howlers (Alouatta palliata mexicana) living in different sized forest fragments in Los Tuxtlas, Mexico. The RH group, which lived in a larger and more(More)
Males often face a trade-off between investments in precopulatory and postcopulatory traits [1], particularly when male-male contest competition determines access to mates [2]. To date, studies of precopulatory strategies have largely focused on visual ornaments (e.g., coloration) or weapon morphology (e.g., antlers, horns, and canines). However,(More)
The threat that forest fragmentation and habitat loss presents for several Alouatta taxa requires us to determine the key elements that may promote the persistence of howler monkeys in forest fragments and to evaluate how changes in the availability of these elements may affect their future conservation prospects. In this study we analyzed the relationship(More)
Environmental stressors impact physiology in many animal species. Accordingly, the monitoring of fecal glucocorticoid metabolites (fGCM) has been increasingly used to evaluate the physiological costs of habitat disturbance on wild animal populations, providing a powerful tool for conservation and management. Several studies have suggested that primates in(More)
Lianas are important components in the dynamics of tropical forests and represent fallback foods for some primates, yet little is known about their impact on primate ecology, behavior or fitness. Using 2 yr of field data, we investigated liana consumption and foraging effort in four groups of howler monkeys (two in bigger, more conserved forest fragments(More)
The Mexican howler monkey (Alouatta palliata mexicana) is a critically endangered primate, which is paleoendemic to Mexico. However, despite the potential significance of genetic data for its management and conservation, there have been no population genetic studies of this subspecies. To examine genetic diversity in the key remaining forest refuge for A.(More)
There are a growing number of reports of antibiotic resistance (ATBR) in bacteria living in wildlife. This is a cause for concern as ATBR in wildlife represents a potential public health threat. However, little is known about the factors that might determine the presence, abundance and dispersion of ATBR bacteria in wildlife. Here, we used culture and(More)
A fundamental assumption in bioacoustics is that large animals tend to produce vocalizations with lower frequencies than small animals. This inverse relationship between body size and vocalization frequencies is widely considered to be foundational in animal communication, with prominent theories arguing that it played a critical role in the evolution of(More)
Natural selection has resulted in the acoustic convergence of many animal vocalizations. During agonistic interactions vocalizations may vary depending on the role an individual plays in the interaction and on the severity of the attack. Motivation-structural rules describe how aggressors are thought to have evolved to use low-frequency vocalizations,(More)
Long-term field studies of primates are critical for our understanding of life history and the processes driving changes in demography. Here, we present the first long-term demographic data for the northernmost population of the mantled howler monkey (Alouatta palliata). We followed 10 groups of howler monkeys living in a highly fragmented landscape between(More)