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Chimpanzee quiet hoo variants differ according to context.

ABSTRACT: In comparative studies of evolution of communication, the function and use of animal quiet calls have typically been understudied, despite that these signals are presumably under selection like other vocalizations, such as alarm calls. Here, we examine vocalization diversification of chimpanzee quiet 'hoos' produced in three contexts-travel, rest and alert-and potential pressures promoting diversification. Previous playback and observational studies have suggested that the overarching function of chimpanzee hoos is to stay in contact with others, particularly bond partners. We conducted an acoustic analysis of hoos using audio recordings from wild chimpanzees (Pan troglodytes schweinfurthii) of Budongo Forest, Uganda. We identified three acoustically distinguishable, context-specific hoo variants. Each call variant requires specific responses from receivers to avoid breaking up the social unit. We propose that callers may achieve coordination by using acoustically distinguishable calls, advertising their own behavioural intentions. We conclude that natural selection has acted towards acoustically diversifying an inconspicuous, quiet vocalization, the chimpanzee hoo. This evolutionary process may have been favoured by the fact that signallers and recipients share the same goal, to maintain social cohesion, particularly among those who regularly cooperate, suggesting that call diversification has been favoured by the demands of cooperative activities.

SUBMITTER: Crockford C

PROVIDER: S-EPMC5990785 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Chimpanzee quiet hoo variants differ according to context.

Crockford Catherine C Gruber Thibaud T Zuberbühler Klaus K

Royal Society open science 20180523 5

In comparative studies of evolution of communication, the function and use of animal quiet calls have typically been understudied, despite that these signals are presumably under selection like other vocalizations, such as alarm calls. Here, we examine vocalization diversification of chimpanzee quiet 'hoos' produced in three contexts-travel, rest and alert-and potential pressures promoting diversification. Previous playback and observational studies have suggested that the overarching function o ...[more]

PMID: 29892396

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Project description:BackgroundPractice facilitation is an implementation strategy used to build practice capacity and support practice changes to improve health care outcomes. Yet, few studies have investigated how practice facilitation strategies are tailored to different primary care contexts.ObjectiveTo identify contextual factors that drive facilitators' strategies to meet practice improvement goals, and how these strategies are tailored to practice context.DesignSemi-structured, qualitative interviews analyzed using inductive (open coding) and deductive (thematic) approaches. This study was conducted as part of a larger study, HealthyHearts New York City, which evaluated the impact of practice facilitation on adoption of cardiovascular disease prevention and treatment guidelines.Participants15 facilitators working in two practice contexts: small independent practices (SIPs) and Federally Qualified Health Centers (FQHCs).Main measuresStrategies facilitators use to support and promote practice changes and contextual factors that impact this approach.Key resultsContextual factors were described similarly across settings and included the policy environment, patient needs, site characteristics, leadership engagement, and competing priorities. We identified four facilitation strategies used to tailor to contextual factors and support practice change: (a) remain flexible to align with practice and organizational priorities; (b) build relationships; (c) provide value through information technology expertise; and (d) build capacity and create efficiencies. Facilitators in SIPs and FQHCs described using the same strategies, often in combination, but tailored to their specific contexts.ConclusionsDespite significant infrastructure and resource differences between SIPs and FQHCs, the contextual factors that influenced the facilitator's change process and the strategies used to address those factors were remarkably similar. The findings emphasize that facilitators require multidisciplinary skills to support sustainable practice improvement in the context of varying complex health care delivery settings.

Project description:BackgroundKnee osteoarthritis risk is high after anterior cruciate ligament reconstruction (ACLR) and arthroscopic meniscal surgery, and higher among individuals who undergo both. Although osteoarthritis development is multifactorial, altered walking mechanics may influence osteoarthritis progression. The purpose of this study was to compare gait mechanics after ACLR among participants who had undergone no medial meniscal surgery, partial medial meniscectomy, or medial meniscal repair.MethodsThis was a secondary analysis of data collected prospectively as part of a clinical trial. Sixty-one athletes (mean age of 21.4 ± 8.2 years) who had undergone primary ACLR participated in the study when they achieved impairment resolution (5.3 ± 1.7 months postoperatively), including minimal to no effusion, full knee range of motion, and ≥80% quadriceps-strength symmetry. Participants were classified by concomitant medial meniscal treatment: no involvement or nonsurgical management of a small, stable tear; partial meniscectomy; or meniscal repair. Participants underwent comprehensive walking analyses. Joint contact forces were estimated using a previously validated, electromyography-driven musculoskeletal model. Variables were analyzed using a mixed-model analysis of variance with group and limb comparisons (α = 0.05); group comparisons of interlimb differences in measurements (surgical minus contralateral limb) were performed to determine significant interactions.ResultsThe participants in the partial meniscectomy group walked with a higher peak knee adduction moment (pKAM) in the surgical versus the contralateral limb as compared with those in the meniscal repair group and those with no medial meniscal surgery (group difference for partial versus repair: 0.10 N-m/kg-m, p = 0.020; and for partial versus none: 0.06 N-m/kg-m, p = 0.037). Participants in the repair group walked with a smaller percentage of medial to total tibiofemoral loading in the surgical limb compared with both of the other groups (group difference for repair versus partial: -12%, p = 0.001; and for repair versus none: -7%, p = 0.011). The participants in the repair group loaded the medial compartment of the surgical versus the contralateral limb 0.5 times body weight less than did the participants in the partial meniscectomy group.ConclusionsParticipants in the partial meniscectomy group walked with higher pKAM and shifted loading toward the medial compartment of the surgical limb, while participants in the repair group did the opposite, walking with lower pKAM and unloading the surgical limb relative to the contralateral limb. These findings may partially explain the conflicting evidence regarding pKAM after ACLR and the elevated risk for osteoarthritis (whether from overloading or underloading) after ACLR with concomitant medial meniscectomy or repair.Level of evidenceTherapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

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Chimpanzee quiet hoo variants differ according to context.

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Chimpanzee quiet hoo variants differ according to context.

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