Felipe P da Costa, Maria F Arruda, Karina Ribeiro, Daniel M A Pessoa
{"title":"The importance of color and body size for reproductive decision making by males and females of the giant river prawn, Macrobrachium rosenbergii (de Man, 1879) (Decapoda, Caridea, Palaemonidae).","authors":"Felipe P da Costa, Maria F Arruda, Karina Ribeiro, Daniel M A Pessoa","doi":"10.1016/j.beproc.2024.105137","DOIUrl":"10.1016/j.beproc.2024.105137","url":null,"abstract":"<p><p>The selection and expression of conspicuous colorations in animals is often related to anti-predation strategies and sociosexual communication. The giant river prawn, Macrobrachium rosenbergii (de Man, 1879) is a species with three male morphotypes that vary in claws' coloration and the size of the animals. It has been suggested that male reproductive quality might be associated to their coloration, but evidence is still conflicting. In addition, a possible communication function of orange patches, that occupies a large portion of egg-bearing females' cephalothorax, has never been investigated before. For that matter, in this study, we evaluated the importance of visual cues for reproductive decision making by males and females of the giant river prawn. Through two-choice discrimination experiments, we verified whether: 1) females would be equally attracted to the presence of males expressing different claw colorations and body sizes; 2) female reproductive status and body size would influence males' decision making. Under the tested experimental conditions, females predominantly chose larger over smaller males, while males showed no significant preference for any kind of female. It is possible that body size is one of the cues that females use to identify males' morphotype. The choice of larger males could provide greater protection for females against harassment by other males. Further studies should employ visual cues in combination with chemical ones for a better understanding of mate choice in this species.</p>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":" ","pages":"105137"},"PeriodicalIF":1.3,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142926348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Emma Suvi McEwen , Matthias Allritz , Josep Call , Sarah E. Koopman , Emilie Rapport Munro , Cristóbal J. Bottero Cantuarias , Charles R. Menzel , Francine L. Dolins , Karline R.L. Janmaat , Kenneth Schweller
{"title":"Training primates to forage in virtual 3D environments","authors":"Emma Suvi McEwen , Matthias Allritz , Josep Call , Sarah E. Koopman , Emilie Rapport Munro , Cristóbal J. Bottero Cantuarias , Charles R. Menzel , Francine L. Dolins , Karline R.L. Janmaat , Kenneth Schweller","doi":"10.1016/j.beproc.2024.105126","DOIUrl":"10.1016/j.beproc.2024.105126","url":null,"abstract":"<div><div>Virtual environment software is increasingly being employed as a non-invasive method in primate cognition research. Familiar and novel stimuli can be presented in new ways, opening the door to studying aspects of cognition in captivity which previously may not have been feasible. Despite the increased complexity of visual input compared to more traditional computerised studies, several groups of captive primates have now been trained to navigate virtual three-dimensional environments. Here, we outline a method for training primates to use a computerised virtual foraging task presented on a touchscreen. We document how to tailor this method to groups facing different training challenges. We present data from three groups: touchscreen-experienced chimpanzees (<em>Pan troglodytes</em>), touchscreen-naïve orang-utans (<em>Pongo abelii</em>), and chimpanzees tested in a group setting. Subjects from all groups mastered basic navigation challenges with relative ease (some in as little as 16 days), setting them up for systematic studies of primate cognition within virtual environments. The training method we present is flexible, yet structured, and we encourage other researchers to adapt it to implement virtual environment research with more individuals and across more species.</div></div>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":"224 ","pages":"Article 105126"},"PeriodicalIF":1.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Behavioural ProcessesPub Date : 2025-01-01Epub Date: 2024-12-27DOI: 10.1016/j.beproc.2024.105135
Heather M Manitzas Hill, Manon Themelin, Kathleen M Dudzinski, Michael Felice, Todd Robeck
{"title":"Individual variation in activity budgets of a stable population of killer whales in managed care across a year.","authors":"Heather M Manitzas Hill, Manon Themelin, Kathleen M Dudzinski, Michael Felice, Todd Robeck","doi":"10.1016/j.beproc.2024.105135","DOIUrl":"10.1016/j.beproc.2024.105135","url":null,"abstract":"<p><p>Activity budget investigations are necessary to understand how individuals within a group manage their daily activities, thus providing insights into the social dynamics of a species. Our objective was to explore and describe the behavioral activities within a group of managed care killer whales. From 261 hours of coded surface video collected from April 2022 to January 2023, we scan-sampled day-time hours to examine eight behavioral categories exhibited by 8-9 killer whales bimonthly. Minimal sex differences were found within each behavioral category across month and hour block. Females exhibited significantly more attention to trainers and rubbing on the environment than males. Individual variability was documented for all behavioral categories. The youngest male showed the most (43 % of scans) proximity and social interactions with conspecifics whereas all adults, both females and males, showed similar levels of social behavior. Three adult females and one adult male spent about a third of all scans observing their trainer(s) as they moved around the habitat. This observational behavior has been described in other delphinids as anticipatory behavior indicating a willingness to participate in future interactions with their trainers whether food rewards were available or not, and has been confirmed to represent a state of positive well-being. All killer whales actively engaged with peers and their environment in about 40 % of the documented scans. These findings are similar in degree to that observed in various other delphinid populations and support the interpretation that this killer whale group is in receive of positive welfare, displaying normal levels of social and individual behaviors for this species. Our results add to the growing body of knowledge about how killer whales manage their actions, both with conspecifics and their environment, across different social settings given their surroundings.</p>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":" ","pages":"105135"},"PeriodicalIF":1.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142902553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Behavioural ProcessesPub Date : 2025-01-01Epub Date: 2024-12-19DOI: 10.1016/j.beproc.2024.105134
Yukiko Ogura, Ai Kawamori, Toshiya Matsushima
{"title":"Chicks make stochastic decisions based on gain rates of different time constants.","authors":"Yukiko Ogura, Ai Kawamori, Toshiya Matsushima","doi":"10.1016/j.beproc.2024.105134","DOIUrl":"10.1016/j.beproc.2024.105134","url":null,"abstract":"<p><p>The marginal value theorem (MVT) predicts that optimal foragers leave a patch when the instantaneous gain rate decreases to the average long-term gain rate. However, various animals systematically deviate from this optimum by staying too long or overharvesting relative to this optimum. We hypothesised that animals do not represent their optimal stay time but instead determine their departure point probabilistically. To test this hypothesis, we conducted behavioural experiments and modelling using chicks. The chicks ran on a treadmill with feeders on both sides, and their travel time to the feeder was experimentally controlled. As predicted by the MVT, the chicks stayed longer at the feeder when forced to run more. However, they stayed even longer than predicted by the MVT. Therefore, we constructed and compared stochastic decision-making models with the MVT-based model. The stochastic models explained the chicks' behaviour better than the MVT-based model. These results suggest that chicks leave probabilistically based on their immediate foraging history rather than representing an optimal stay time.</p>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":" ","pages":"105134"},"PeriodicalIF":1.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142871005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cost does not prevent pigeons from investing in the future.","authors":"Sarah Cowie, Michael Davison","doi":"10.1016/j.beproc.2024.105125","DOIUrl":"10.1016/j.beproc.2024.105125","url":null,"abstract":"<p><p>One of the simplest forms of behavior, operant behavior, appears fundamentally prospective, implying potential similarity to 'sophisticated' prospective behaviors like planning in terms of underlying mechanisms. But differences between paradigms for studying behavior resulting from 'simple' versus 'sophisticated' mechanisms prevent true comparison of underlying mechanisms. To aid development of an operant paradigm with more similarity to 'sophisticated' prospective paradigms, we replicated and extended Cowie and Davison's (2021) investing task. Pigeons were required to emit an investing response to ensure food at a different time and different response location. We asked if investing depended on whether the behavior was a single, discrete key peck (typical in operant paradigms) or an extended sequence of pecks (echoing behaviors in planning paradigms), and whether facilitative effects of an immediate stimulus change persisted when the stimulus change no longer occurred. Pigeons invested successfully whether investing required one or more responses, and for extended investing responses, performance did not worsen significantly with increasing response requirements. Experience investing with an immediate stimulus change did not enhance subsequent investing without the stimulus change. Findings show simple learning mechanisms can support extended activities with no immediate consequences. Further, they support the investing paradigm as a potential tool for investigations of overlap in mechanisms controlling 'simple' and 'sophisticated' behavior.</p>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":" ","pages":"105125"},"PeriodicalIF":1.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142827294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sex-based differences, diurnal and seasonal trends in thermoregulatory behaviour of nesting Painted Stork (Mycteria leucocephala)","authors":"Paritosh Ahmed, Abdul Jamil Urfi","doi":"10.1016/j.beproc.2024.105115","DOIUrl":"10.1016/j.beproc.2024.105115","url":null,"abstract":"<div><div>To cope with heat stress, storks wet their legs by excreting on them, known as urohidrosis, and perform wing-spreading in which the wings are half extended in the form of an inverted triangle. While several studies have highlighted the role of urohidrosis as an important cooling mechanism and suggested a possible thermoregulatory function of wing-spreading, sex-based comparisons and trends of these behaviours throughout the breeding season remain unexplored. Here we explore thermoregulation in a wild population of Painted Storks (<em>Mycteria leucocephala</em>) nesting in the National Zoological Park, Delhi, India, through the non-invasive videography technique. Temperature, humidity and wind speed significantly influenced both urohidrosis and wing-spreading behaviours. Male storks exhibited higher rates of urohidrosis and spend more time wing-spreading compared to females. Seasonal and diurnal differences were observed with more urohidrosis and wing-spreading during the hottest hours of the day and early part of the nesting season in August-September. The rate of both behaviours declined as the nesting season progressed till November when ambient temperatures dropped.</div></div>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":"223 ","pages":"Article 105115"},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Julia Laura Pompeu de Abreu, Vinícius de Avelar São-Pedro
{"title":"Experimental evidence of aposematic signal in black tadpoles","authors":"Julia Laura Pompeu de Abreu, Vinícius de Avelar São-Pedro","doi":"10.1016/j.beproc.2024.105124","DOIUrl":"10.1016/j.beproc.2024.105124","url":null,"abstract":"<div><div>Aposematism is a widespread defense mechanism in animals. Anuran amphibians are known for their extensive repertoire of defenses, especially in the adult stage. Color-based mechanisms are particularly common in this group, although their use during the larval stage is still understudied. The hypothesis of aposematism in tadpoles has been suggested for several species that present conspicuous coloration and unpalatability. Tadpoles of some bufonid toads have been considered aposematic for decades, as they have a conspicuous black color, are unpalatable, and form aggregations that make them even more visible. However, few empirical studies have tested aposematism in these larvae against visually oriented predators, such as birds. In this paper, we tested whether the uniform black coloration acts as an aposematic signal in anuran larvae. The research was conducted through field predation experiments using artificial replicas of tadpoles of different colors (brown, gray, and black). The survival of black replicas was significantly higher than that of control groups, supporting the aposematism hypothesis. Given that the replicas varied only in color, we conclude that the differential attacks among treatments were carried out by visually oriented predators, probably birds, that had learned to recognize and avoid black tadpoles.</div></div>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":"223 ","pages":"Article 105124"},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142725353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shota Okabe , Yuki Takayanagi , Ryosuke O. Tachibana , Ayumu Inutsuka , Masahide Yoshida , Tatsushi Onaka
{"title":"Behavioural response of female Lewis rats toward 31-kHz ultrasonic calls","authors":"Shota Okabe , Yuki Takayanagi , Ryosuke O. Tachibana , Ayumu Inutsuka , Masahide Yoshida , Tatsushi Onaka","doi":"10.1016/j.beproc.2024.105111","DOIUrl":"10.1016/j.beproc.2024.105111","url":null,"abstract":"<div><div>Rodent ultrasonic vocalisations can be used to assess social behaviour and have attracted increasing attention. Rats emit 50-kHz and 22-kHz calls during appetitive and aversive states, respectively. These calls induce behavioural and neural responses in the receiver by transmitting the internal states of the rats, thus serving communicative functions. Recently, we discovered that female Lewis rats emit 31-kHz calls under social isolation and inequality conditions; however, the biological significance of 31-kHz calls remains unknown. In the present study, we conducted three playback experiments to examine the behavioural effects of 31-kHz calls. In the first experiment, Lewis female rats were exposed to four types of sound: 22-kHz, 50-kHz, 31-kHz calls, and environmental noise. As a result, rats stayed significantly longer in the area with a sound-producing speaker, regardless of the sound type, than in the silent speaker area. The duration spent around the sound-producing speaker was particularly extended during the 50-kHz or 31-kHz call playback, compared to the environmental noise or 22-kHz call playback. In the second experiment, rats were exposed to refined versions of sound stimuli that were synthesised to preserve prominent frequency components while removing background noise from original calls. Rats significantly preferred to stay around the speaker for the synthesised 50-kHz and 31-kHz sounds, but not for the synthesised 22-kHz sound. However, in the third experiment, additional 31-kHz sound synthesised from calls emitted by a different rat did not elicit a significant preference for the source side. These results suggest that the rats paid attention to the 31-kHz call, although it is plausible that acoustic variability in the 31-kHz USV may affect their approach behaviour.</div></div>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":"223 ","pages":"Article 105111"},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142340283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Amphipods (Gammarus pseudolimnaeus) do not demonstrate a left-right preference in a 3-D printed aquatic T-maze","authors":"Joshua E. Wolf, Melissa Larsen","doi":"10.1016/j.beproc.2024.105123","DOIUrl":"10.1016/j.beproc.2024.105123","url":null,"abstract":"<div><div>Crustaceans are increasingly used as research subjects in experiments investigating learning in invertebrates. While many of these species may be useful models it is essential to document the presence or absence of behavioral laterality, especially considering the long-held belief that functional lateralization was unique to humans or other vertebrate species. Neglecting this fundamental step weakens the applicability of results and may unnecessarily complicate experimental design. Amphipods (<em>Gammarus pseudolimnaeus)</em> may be a useful invertebrate for studying simple discriminations or escape behavior, but research on their potential behavioral laterality is absent. The current study investigated whether amphipods demonstrate a left-right bias when navigating an aquatic T-maze by placing them in the maze and recording their choices across multiple trials. Our results suggested that amphipods do not show a strong left-right bias during initial navigation of an aquatic T-maze. These findings may encourage other researchers to test invertebrates for behavioral laterality, utilize amphipods in studies of simple forms of learning, and potentially simplify future experimental design.</div></div>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":"223 ","pages":"Article 105123"},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142602990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Individual consistency of hissing displays across night and day in a free-living female songbird","authors":"Bert Thys , Rianne Pinxten , Marcel Eens","doi":"10.1016/j.beproc.2024.105113","DOIUrl":"10.1016/j.beproc.2024.105113","url":null,"abstract":"<div><div>Birds have evolved a variety of antipredator strategies, which have been extensively studied during day-time. Yet, how diurnal birds directly respond to nocturnal predation threats remains largely elusive, despite that predation risk can be high during both night- and day-time. One form of antipredator behaviour found in several tit species when confronted with a predator at the nest is the hissing display. As for many forms of antipredator behaviour, studies on hissing displays have so far focussed on the day-time. Here, we exposed cavity-nesting free-living female great tits (<em>Parus major</em>) to simulated predator intrusions inside their nest box during both night- and day-time. We showed that 28 % of females uttered at least one hissing call during night-time, while the occurrence of hissing calls was higher during day-time (84 %). Hissing females at night, compared to non-hissing females, produced more hissing calls during day-time, providing evidence for individual cross-context consistency. Night-time hissing behaviour did not predict lay date, clutch size, breeding or nest success, indicating the absence of consequences in terms of current reproduction. Together, we reveal the hitherto undescribed occurrence of hissing displays at night in a cavity-nesting bird, while simultaneously strengthening the evidence for the existence of hissing behavioural types.</div></div>","PeriodicalId":8746,"journal":{"name":"Behavioural Processes","volume":"222 ","pages":"Article 105113"},"PeriodicalIF":1.3,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142493875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}