Animal reactivity to camera traps and its effects on abundance estimate using distance sampling in the Taï National Park, Côte d’Ivoire

PeerJ, Год журнала: 2022, Номер 10, С. e13510 - e13510

Опубликована: Май 27, 2022

The use of camera traps (CTs) has become an increasingly popular method studying wildlife, as CTs are able to detect rare, nocturnal, and elusive species in remote difficult-to-access areas. It thus makes them suited estimate animal density abundance, identify activity patterns new behaviours animals. However, animals can react when they see the this lead bias population estimates. While may provide many advantages, improved understanding their impacts on individual’s behaviour is necessary avoid erroneous Yet, impact detected individuals, such human odour near device environment, or infrared illumination, received relatively little attention. To date, there no clear procedure remove potential bias. Here, we trap distance sampling (CTDS) (1) quantify resulting from different responses determining (2) test if olfactory, visual auditory signals have influence animals’ reaction CTs. Between March 2019 2020, deployed at 267 locations distributed systematically over entire Taï National Park. We obtained 58,947 videos which analysed four medium- to-large-bodied (Maxwell’s duiker ( Philantomba maxwellii ), Jentink’s Cephalophus jentinki pygmy hippopotamus Choeropsis liberiensis ) Western chimpanzee Pan troglodytes verus )) displaying towards then established species-specific ethograms describing behavioural Using these responses, observed that Maxwell’s reacted weakly (about 0.11% data), contrary duiker, with high frequencies, representing 32.82%, 52.96% 16.14% data, respectively. Not taking into account artificial doubling tripling populations’ sizes. All more close distances. Besides, significantly night than during day. Finally, for olfactory signals, probability first days after installation was weak but concerned 18% video captures chimpanzees decreasing time, remained (65% 70% respectively). Careful consideration should be given animal’s response analysis field, by reducing human’s around installation.

Язык: Английский

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Ecological, social, and intrinsic factors affecting wild orangutans’ curiosity, assessed using a field experiment

Scientific Reports, Год журнала: 2023, Номер 13(1)

Опубликована: Авг. 14, 2023

Abstract The readiness to interact with and explore novel stimuli—i.e., curiosity—is the cornerstone of innovation. Great apes show broad complex innovation repertoires. However, little is known about factors that affect curiosity in wild apes. To shed light on apes’ curiosity, we measured reactions Sumatran orangutans ( Pongo abelii ) an experiment apparatus. Overall, individuals were reluctant touch compared adults, immatures showed higher tendencies (measured through looking durations probability touching apparatus) approach latencies distances) apparatus but more likely behavioral signs agitation. presence conspecifics who approached increased visual exploration tendencies. Prevailing habitat food availability positively affected had a negative effect These findings indicate intrinsic, social, ecological novelty suggest exploration, neophobia neophilia are independently regulated. Because can be essential pathway innovation, our results acting different elements must considered understand evolution innovative

Язык: Английский

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The Role of Umwelt in Animal Curiosity: A Within and Between Species Comparison of Novelty Exploration in Mongooses

Animal Behavior and Cognition, Год журнала: 2023, Номер 10(4), С. 329 - 354

Опубликована: Ноя. 1, 2023

In its broadest sense, curiosity has been described as an intrinsic motivation to acquire novel information; this ‘novelty-seeking’ is notably in the absence of any immediate reward. One way examine information seeking animals, present animals with objects and measure gather through exploration. While a standardized common paradigm, few studies have focused on what factors influence how perceive novelty, whilst considering predicted impacts animal’s ‘umwelt’ study we assessed explorative behaviors mongooses both intra interspecific view. First, meerkats (Suricata suricatta) tested their natural environment, established that they distinguish familiar from unfamiliar show increased exploration objects. We also found odor influenced meerkats’ action, so non-odorous items were manipulated longer. Presence conspecifics approaches but not per se. Human presence interacted individual’s level habituation impact novelty strong captivity effect between captive wild meerkats. Between species analysis showed yellow (Cynictis penicillate), less social mongoose than meerkats, higher levels exploration, when within same habitat. Thus, these findings multiple factors, including perceptual abilities (merkwelt) (sozialwelt), are decisive for explore environment must be considered designing paradigm tests interpretations.

Язык: Английский

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For emergency only: terrestrial feeding in Coimbra-Filho’s titis reflects seasonal arboreal resource availability

Primates, Год журнала: 2020, Номер 62(1), С. 199 - 206

Опубликована: Авг. 29, 2020

Язык: Английский

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First report of a leopard (Panthera pardus)–bonobo (Pan paniscus) encounter at the LuiKotale study site, Democratic Republic of the Congo

Primates, Год журнала: 2021, Номер 62(4), С. 555 - 562

Опубликована: Май 5, 2021

Abstract Predation is a major cause of mortality in non-human primates, and considered selective force the evolution primate societies. Although larger body size as protection against predation, evidence for predation on great apes by carnivores comes from chimpanzees ( Pan troglodytes ), gorillas Gorilla gorilla orangutans Pongo spp.). Here, we describe first encounter between wild bonobos paniscus ) leopard Panthera pardus ). A single was confronted group habituated three hours. Two adult males one adolescent female bonobo actively harassed leopard, which remained still most reacted only to close approaches bonobos. While no observed, their behaviours confirm that perceive leopards potential predators. Our report adds novel information descriptions other African ape species, sheds light behavioural repertoire bonobos’ anti-predation strategies. For future investigations, suggest tagging remotely monitor movements allow assessment rates several factors influencing pressure.

Язык: Английский

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