<i>Alouatta pigra</i> males ignore <i>A. palliata</i> loud calls: A case of failed rival recognition?

Kitchen, Dawn M.; Cortés‐Ortiz, Liliana; Dias, Pedro Américo D.; Canales‐Espinosa, Domingo; Bergman, Thore J.

doi:10.1002/ajpa.23443

Cited by 6 publications

(4 citation statements)

References 59 publications

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“…Because numeric response variables (i.e., latency to move, number of calls produced, and total reaction duration) were correlated (Spearman correlation between all responses: p < .022), we combined all three of these variables into a “response strength index” using a principal component analysis (PCA; McGregor, ). Following Kitchen, Cortés‐Ortiz, Dias, Canales‐Espinosa, and Bergman (), we focused on the component that explained the most variance, hereafter referred to as PC1. Since data were approximately normally distributed, PC1 was analyzed using a linear mixed model (LMM) with subject identity nested within group identity as a random factor, and presentation mode (audio and visual), predator type (jaguar and harpy eagle), and the interaction of presentation mode and predator type as fixed factors.…”

Section: Methodsmentioning

confidence: 99%

Model vs. playback experiments: The impact of sensory mode on predator‐specific escape responses in saki monkeys

Adams

Kitchen

2020

Ethology

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Although experimentally simulating predator presence helps improve sample sizes in studies of free‐ranging animals, few studies have examined whether auditory playbacks and visual models produce similar results. Additionally, it is unclear if anti‐predator strategies are specific to predator hunting styles in understudied Neotropical pitheciid primates, limiting what we can generalize about this phenomenon across this taxonomic order. We conducted predator simulation experiments to assess whether wild Rylands' bald‐faced saki monkeys (Pithecia rylandsi) recognize predators based solely on acoustic cues, exhibit predator‐specific responses to different predator types, and vary responses to presentations in different sensory modes. In our playback experiments, sakis had weak responses to non‐predator control vocalizations compared to jaguar growls and harpy eagle shrieks. In most predator playbacks, subjects' first glance corresponded to the direction from which simulated predators would typically attack (above vs. below). However, although sakis exhibited appropriate movement responses to harpy playbacks (i.e., descending canopy), they exhibited no clear movement patterns when presented with jaguar playbacks. In contrast, jaguar model experiments consistently elicited fast approaches, mobbing‐style responses, and long alarm calling bouts. Thus, if we had relied on playbacks alone, we might have concluded that sakis have only generalized responses to terrestrial ambush predators. In fact, in all variables measured (e.g., latency, number of calls, and response duration), models of both predator species elicited stronger reactions than playbacks. Results indicate that bald‐faced sakis can identify predators based solely on vocalizations, but do not exhibit predator‐specific escape responses to terrestrial predators based on acoustic cues alone. The differential response to playbacks and models calls into question the reliability of using acoustic‐only stimuli to assess the specificity of anti‐predator behavior to predator hunting styles in some primate species.

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Section: Methodsmentioning

confidence: 99%

Model vs. playback experiments: The impact of sensory mode on predator‐specific escape responses in saki monkeys

Adams

Kitchen

2020

Ethology

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“…We defined a vocal response as a loud call produced within 60 min of the initial loud call (Kitchen, 2004;Kitchen et al, 2018).…”

Section: Behavioral Data Collectionmentioning

confidence: 99%

Vocal and movement responses of mantled howler monkeys (Alouatta palliata) to natural loud calls from neighbors

Ceccarelli

Rangel‐Negrín

Coyohua-Fuentes

et al. 2021

American J Primatol

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Loud calls (i.e., long-range acoustic signals) regulate resource competition among neighboring groups of conspecifics in several nonhuman primate species. Ultimate explanations for primate loud calls include mate, offspring, and food defense. Additionally, loud calls may provide valuable information pertaining to the identity and health status of callers, their competitive abilities, and their spatial location. The loud calls of howler monkeys (Alouatta) have been thoroughly studied and seem to play an important function in the defense of valuable resources in a variety of socioecological contexts. Here, we examined whether the behavioral responses of mantled howler monkeys (Alouatta palliata) to natural loud calls from neighbors are linked to three factors: food availability, familiarity, and distance between groups.We studied three groups of mantled howler monkeys at La Flor de Catemaco (Los Tuxtlas, Mexico) for 15 months (1817 observation hours), during which we recorded 236 neighbor loud calls. Food availability per se did not influence the behavior of groups receiving loud calls, although males produced longer vocal responses toward unfamiliar neighbors when food availability decreased. Groups vocalized quicker and both vocalized and moved for longer after loud calls from unfamiliar neighbors.Additionally, groups vocalized and moved for longer at shorter distances from unfamiliar neighbors compared with familiar neighbors. Finally, groups usually moved away from calling neighbors that were closer. These results indicate that the behavioral responses of mantled howler monkeys to loud calls from neighbor groups are associated with the integration of information pertaining to caller identity as well as to their ecological and spatial context.

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“…By using both field observations/recording and laboratory analysis of genetic admixture of individuals from the hybrid zone, we determined that acoustic features of vocalizations were strongly associated with genetic ancestry, but temporal features of the vocalizations showed evidence of plasticity. Finally, we explored the effect of vocal differences in recognizing potential same‐sex rivals in the context of hybridization by conducting playback experiments with naïve (allopatric) populations of each species, and found specific differences in the response to heterospecific callers (Kitchen, Cortés‐Ortiz, Dias, Canales‐Espinosa, & Bergman, ). Specifically, A. palliata males responded equally to calls from both species, but A. pigra only responded to conspecific calls, suggesting that A. pigra males may not be able to recognize interspecific rivals that could compete for reproductive opportunities.…”

Section: Project Outcomesmentioning

confidence: 99%

From Mexico to Michigan and back: An international collaboration investigating primate behavior, ecology, and evolution from multiple perspectives

Cortés‐Ortiz

Espinosa

Dias

et al. 2019

American J Primatol

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Evolutionary research benefits form the integration of laboratory and field components to determine factors and processes that affect the evolutionary trajectories of species. Our shared interest in understanding hybridization with genetic admixture as a process that may impact social, behavioral, and ecological features of primates, brought us together in a collaborative project aimed at addressing how vocal variation in two species of howler monkeys in Mexico affects and is affected by hybridization. To achieve this goal, we joined our academic expertise in studying primate genetics, ecology, and behavior under different natural and experimental conditions. We took advantage of decades of experience studying

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Alouatta pigra males ignore A. palliata loud calls: A case of failed rival recognition?

Cited by 6 publications

References 59 publications

Model vs. playback experiments: The impact of sensory mode on predator‐specific escape responses in saki monkeys

Model vs. playback experiments: The impact of sensory mode on predator‐specific escape responses in saki monkeys

Vocal and movement responses of mantled howler monkeys (Alouatta palliata) to natural loud calls from neighbors

From Mexico to Michigan and back: An international collaboration investigating primate behavior, ecology, and evolution from multiple perspectives

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