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Abnormal ingestive behavior in male zoo gorillas: investigating the dietary and activity patterns associated with regurgitation and reingestion

رفتار غیرطبیعی خوردن در گوریل‌های نر باغ‌وحش: بررسی الگوهای رژیم غذایی و فعالیت مرتبط با بازگرداندن و بازخوردن

Rhiannon L. Schultz, Isabella L. K. Clegg, Roberta Salmi

Frontiers in Ethology 2026 Vol. 5
https://doi.org/10.3389/fetho.2026.1896803

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چکیده

Introduction Regurgitation and reingestion (R&R) is a widely observed, yet poorly understood, abnormal ingestive behavior among zoo-housed apes, including gorillas. While frequently characterized as a stereotypical behavior, emerging hypotheses suggest R&R may serve metabolic or self-regulatory functions in response to altered feeding patterns in captivity. Methods In this study, we investigated which patterns of activity and food intake are associated with increased likelihood of R&R events in 21 male western lowland gorillas across five zoological institutions in the United States. Behavioral observations were recorded using focal and instantaneous sampling to generate activity budgets of R&R behavior. Results R&R was found to be negatively correlated with the time spent feeding and to occur more frequently in the afternoons. Predictive modeling identified high-risk behavioral sequences that may be associated with increased likelihood of R&R. R&R was frequently preceded by travel, feeding, and inactivity, suggesting a potential link to satiety signaling or boredom. Nutrient data were also analyzed to determine whether certain food items were disproportionately associated with the behavior. Commercial primate chow, fruit juice, cabbage, nuts, and carrots were among the foods most likely to be regurgitated and reingested. Discussion These results support the hypothesis that both behavioral context and dietary composition contribute to the expression of R&R in captive gorillas. This research may help identify opportunities for refining feeding strategies and enrichment protocols to mitigate the occurrence of R&R in managed care populations.

چکیده به فارسی

مقدمه: بازگرداندن و بازخوردن (R&R) رفتاری غیرطبیعی در خوردن است که به طور گسترده‌ای در میان میمون‌های بزرگ نگهداری‌شده در باغ‌وحش، از جمله گوریل‌ها، مشاهده می‌شود اما به خوبی درک نشده است. اگرچه این رفتار اغلب به عنوان یک رفتار قالبی توصیف می‌شود، فرضیه‌های جدید پیشنهاد می‌کنند که R&R ممکن است عملکردهای متابولیک یا خودتنظیمی در پاسخ به الگوهای تغذیه‌ای تغییر یافته در اسارت داشته باشد. روش‌ها: در این مطالعه، الگوهای فعالیت و دریافت غذایی که با افزایش احتمال وقوع رویدادهای R&R در ۲۱ گوریل نر غربی جلگه‌ای در پنج مؤسسه جانورشناسی در ایالات متحده مرتبط هستند، بررسی شد. مشاهدات رفتاری با استفاده از نمونه‌گیری متمرکز و لحظه‌ای ثبت شد تا بودجه فعالیت رفتار R&R تهیه شود. نتایج: مشخص شد که R&R با مدت زمان صرف‌شده برای تغذیه همبستگی منفی دارد و بیشتر در ساعات بعدازظهر رخ می‌دهد. مدل‌سازی پیش‌بینانه توالی‌های رفتاری پرخطر را شناسایی کرد که ممکن است با افزایش احتمال R&R مرتبط باشند. R&R اغلب پس از جابه‌جایی، تغذیه و بی‌تحرکی رخ می‌دهد که نشان‌دهنده ارتباط احتمالی با سیگنال‌های سیری یا کسالت است. داده‌های تغذیه‌ای نیز مورد تجزیه و تحلیل قرار گرفت تا مشخص شود آیا برخی از اقلام غذایی به طور نامتناسبی با این رفتار مرتبط هستند یا خیر. خوراک تجاری پریمات، آب‌میوه، کلم، آجیل و هویج از جمله غذاهایی بودند که بیشترین احتمال بازگرداندن و بازخوردن را داشتند. بحث: این نتایج از این فرضیه حمایت می‌کند که هم زمینه رفتاری و هم ترکیب رژیم غذایی در بروز R&R در گوریل‌های اسیر نقش دارند. این پژوهش می‌تواند به شناسایی فرصت‌هایی برای اصلاح راهبردهای تغذیه و پروتکل‌های غنی‌سازی به منظور کاهش وقوع R&R در جمعیت‌های تحت مدیریت کمک کند.

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موضوع‌ها و کلیدواژه‌ها

خودتنظیمیمدیریتactivity budgetboredomcaptive apesfeeding behaviorsatiety signalsstereotypywestern lowland gorillazoo animal welfare

ارجاع

Schultz, R. L., Clegg, I. L. K., & Salmi, R. (2026). Abnormal ingestive behavior in male zoo gorillas: investigating the dietary and activity patterns associated with regurgitation and reingestion. Frontiers in Ethology, 5. https://doi.org/10.3389/fetho.2026.1896803

(Schultz et al., 2026)

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  1. با احترام و بدون توهین، تحقیر، برچسب‌زنی یا حمله‌ی شخصی با دیگران گفتگو کنید.
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