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acta ethologica
Journal Prestige (SJR): 0.769

Citation Impact (citeScore): 1
Number of Followers: 7

Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1437-9546 - ISSN (Online) 0873-9749
Published by Springer-Verlag

[2468 journals]

Ethologists assemble - macrobehaviour needs you
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  Abstract: Abstract The emerging field of macrobehaviour explores behavioural variation across large geographic, taxonomic, and temporal scales, and its ecological and evolutionary consequences. This unifying framework merges macroecology with ethology, both enhancing our understanding of how behaviour mediates ecological dynamics at scales above the population level, and offering an approach that can broaden the impact of ethological research. Here, I urge ethologists to engage with the field, outlining what “macro” means, why we must act now, why we need your expertise, how you can get involved, and how this line of research offers reciprocal benefits to both disciplines. Together, we can amplify the impact of ethological research while accelerating insight that could inform solutions to the global biodiversity crisis.
  PubDate: 2025-02-06
  DOI: 10.1007/s10211-025-00458-y
Thanatosis in juvenile notolabrus celidotus, the New Zealand spotty wrasse
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  Abstract: Abstract The present study reports a decrease in activity and sudden immobile state, known as thanatosis, in the New Zealand endemic wrasse, Notolabrus celidotus. We observed tonic immobility immediately after wrasse collection in field studies. Escape is the primary defence of juvenile N. celidotus and our observation suggests that thanatosis can be a secondary strategy when the first has failed. The response occurred after N. celidotus was manipulated by being removed from a fishnet and placed into buckets, allowing for the conclusion that N. celidotus may use thanatosis as a secondary defence strategy following physical restraint events.
  PubDate: 2025-02-01
  DOI: 10.1007/s10211-025-00455-1
Mobbing behaviour of hosts and non-hosts towards cuckoo Cuculus canorus of
different sex
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  Abstract: Abstract The common cuckoo Cuculus canorus is an obligate brood parasite of many Eurasian bird species that exploit the parental care of their hosts. Although only females lay eggs in nests of passerine hosts, male and female cuckoos should cooperate to have a success in nest parasitism. Many bird species mobbing cuckoos as an element of deterrence of cuckoos from the breeding territory of the host. However, mobbing behaviour is costly, although only cuckoo females pose a threat to the dangers of the host. Because only the presence of a female cuckoo is dangerous, due to laying eggs in the nests of hosts, birds should mainly attack cuckoo females. Therefore, we tested for differences in anti-parasite response using field experiments with female and male cuckoo dummies, in 92 breeding sites with prime habitats in Poland. tested for differences in cuckoo responses in anti-parasite response using field experiments and cuckoo dummies (male and female) placed at 92 breeding sites with prime habitats in Poland. The host species that behaved most aggressively towards cuckoos was the barn swallow Hirundo rustica, while the most aggressive behaviour recorded in the non-host group was the great tit Parus major. Generally, host species reacted to cuckoo female dummies with a significantly higher probability than cuckoo males dummies. We conclude that differences in reaction by hosts and non-hosts may have arisen from selection for recognition of danger (parasite female) by reduction of reproductive success.
  PubDate: 2025-02-01
  DOI: 10.1007/s10211-024-00450-y
Embracing behavior of Japanese macaques on Shodoshima Island
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  Abstract: Abstract The embracing behavior of Japanese macaques (Macaca fuscata) is a limited number of non-technological and non-subsistence behavior with cultural variations. Existing data were obtained from only two populations. This study first reports the behavior of a provisioned Japanese macaque group on Shodoshima Island, Kagawa Prefecture. Embracing behavior of three adult males and 14 adult females were recorded using focal animal sampling over three months. Behaviors immediately before and after embracing were analyzed. A total of 39 embracing behaviors were observed. Only five females exhibited embracing and there was no evidence of social transmission of this behavior, indicating that embracing is not ingrained as a “culture” in this population. Four of the five females were young adults, suggesting that females, specifically young individuals, were more prone to the behavior. Behaviors immediately before and after embracing tended to be grooming or huddling, suggesting that embracing reduces the tension triggered by physical contact and spatial proximity. This study contributes to the knowledge of cultural variations in non-technological or non-subsistence behaviors.
  PubDate: 2025-02-01
  DOI: 10.1007/s10211-024-00453-9
Halloween day! a molossid bat trapped in a communal spider web in the
Paraná flooded savanna of eastern Argentina
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  Abstract: Abstract Bats are prey for several vertebrate and invertebrate predators including spiders. We report the first case of a subadult female mastiff bat (Molossus molossus, Molossidae) trapped in a communal spider web of Parawixia bistriata (Araneidae, Araneae) with photographs and videotapes. This event occurred in the garden of a house next to a wetland in the east of Santa Fe province, Argentina (Paraná flooded savanna ecoregion). The day after the event, the bat was found dead entangled in the spider web. However, it remained in the spider web for three days until falling due to the effects of a strong storm. During this time in the spider web, the bat was daily visited during twilight by one to four spiders at a time. Over three days, the spiders strengthened the web around the bat and bit it with their chelicerae, which could indicate that they engaged in cooperative feeding on the trapped mammal.
  PubDate: 2025-02-01
  DOI: 10.1007/s10211-024-00451-x
Vigilance levels of sika deer in nonhunting areas with moderate human
activity
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  Abstract: Abstract During predator–prey coexistence, prey species have developed anti-predator behavior to reduce predation risk. In terrestrial ecosystems, humans are the major predators of wild cervids (Cervidae, Cetartiodactyla, Mammalia) in regions where large carnivores have gone extinct due to anthropogenic persecution. Typical anti-predator behavior exhibited by wild cervids includes increasing nocturnality and vigilance. We investigated diel activity and vigilance in sika deer (Cervus nippon) in nonhunting areas using camera-trapping techniques, to determine whether human visitation (i.e., nonlethal effects) increases their nocturnality and vigilance. We established two study sites––inside (low risk) and outside (high risk) of a wildlife reserve at University of Tokyo Chichibu Forest, Saitama, Japan. We hypothesized that in sika deer, nocturnality and vigilance would increase at high-risk site (outside of the reserve), due to the high rate of human visitation. However, vigilance level and diel activity between the two study sites were not different. In female deer, vigilance increased in winter regardless of the site studied. Our findings suggest that hunting activities (e.g., drive hunting with dogs) outside of the studied areas triggered anti-predator behaviors, such as increased vigilance, in sika deer, although our studied sites were not designated as hunting area. Further studies need to elucidate what types of human activities and intensity levels trigger anti-predator behaviors by wild ungulates.
  PubDate: 2025-02-01
  DOI: 10.1007/s10211-024-00454-8
Association between social centrality and morphotypical masculinization in
female wild cavies (Cavia aperea)
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  Abstract: Abstract Understanding the morphotypical masculinization gradient and its impact on social behavior in a natural animal model is essential for unraveling sexual differentiation dynamics and their ecological implications. In this study, we examined the presence of a morphotypical masculinization gradient in female wild cavies (Cavia aperea) and its association with social behavior. Experimental colonies in four enclosures with different initial population densities were established. Between October 2017 and June 2018, we collected two datasets. The first dataset included body mass and anogenital distance (AGD) from 48 females, collected every 15–30 days. Simultaneously, focal behavioral observations were carried out during the intervals between recaptures. The behavioral dataset encompassed 65 marked cavies (males and females); 50 in high-density and 15 low-density conditions. Behavioral data were utilized to construct a focal association index matrix. Social centrality by spatial proximity measures were calculated using eigenvector analysis. Using the AGDI as a proxy for masculinization, we categorized females into three groups based on their AGDI values: low, middle, and high. The AGDI demonstrated high repeatability, underscoring its stability as a metric. Morphotype analysis revealed distinct distributions of AGDI values across varying initial density conditions. No significant associations were found between AGDI values and social centrality. These findings enhance our understanding of social dynamics in C. aperea and emphasize the significance of accounting for morphotypical variability in ecological research.
  PubDate: 2025-02-01
  DOI: 10.1007/s10211-024-00452-w
Evaluation of the toxicity of the pesticide acephate and its by-product
methamidophos over the behaviour of zebrafish Danio rerio (Cypriniformes,
Cyprinidae)
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  Abstract: Abstract Depending on its concentration and bioavailability, the pesticide acephate and its by-product methamidophos may cause deleterious effects on the physiology and behaviour of various animals when in contact with water. Studies investigating the negative impacts of acephate in animals have used zebrafish larvae as a model species, but the effect on adult individuals remains unclear. Our main objective was to assess the behavioural changes in adult zebrafish (Danio rerio) exposed to acephate and methamidophos. To this end, 160 individuals of zebrafish were divided into three groups: acephate, methamidophos (exposed) and control groups (non-exposed), where subjects in the treatment groups were exposed to 7 µg/L of acephate and 7 µg/L methamidophos for 28 days. To compare the groups, behavioural assessments were conducted using scan sampling with instantaneous behaviour recordings every 30 s for ten minutes each day. Fish behaviour and fish location in the water column were compared between treatment and controls using Generalized Linear Mixed Models. The results showed an alteration in swimming patterns, an increase in aggression, an increase in abnormal behaviours and other stress-related behaviours, such as gasping for air, provoked by acephate and methamidophos. These behavioural alterations may have serious consequences for wild fish communities, such as an increased risk of predation and may contribute to the extinction of local populations. These findings highlight the usefulness of behaviour in assessing the environmental impact caused by pesticides.
  PubDate: 2025-01-28
  DOI: 10.1007/s10211-025-00456-0
Unusual intra-specific aggression in striped hyena
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  Abstract: Abstract This study documents a rare aggressive interaction between two striped hyenas (Hyaena hyaena) observed in northern Israel. Agonistic behaviors, which include aggression, submission, and threat displays, are essential for managing social hierarchies and mitigating harm in animal societies. Although striped hyenas typically engage in ritualized behaviors to resolve conflicts non-lethally, the observed confrontation involved intense biting, vocalizations, and significant injuries. The fight’s cause remains unclear. This observation, combined with limited prior reports of similar behavior, highlights the need for continued research and citizen science contributions to better understand the complex and variable social dynamics of striped hyenas. Clinical trial number: Not applicable
  PubDate: 2025-01-23
  DOI: 10.1007/s10211-025-00457-z
Blue-winged parrotlet Forpus xanthopterygius (Aves: Psittacidae), feeding
over water in Southeast Brazil
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  Abstract: Abstract The blue-winged parrot Forpus xanthopterygius is widely distributed in South America, where it lives in groups in different types of environments and feeds on fruits, seeds, flowers and nectar. In 2023 we observed a group of these birds moving from a forested area to an area of aquatic vegetation on the bank of a water reservoir in Southeast Brazil. The birds landed among the leaves of a cluster of Polygonum ferrugineum, approximately 45 cm above the water surface, and consumed flower buds and flowers — a plant species not yet reported for their diet. This behavior occurred during the driest period of the year (April), and may represent an alternative diet due to the scarcity of the preferred resources of this bird species during this period. The species is known to use habitats associated with water and to feed at low heights or even on the ground. However, this behavior of searching for resources on aquatic vegetation at the water surface in the middle of an urban reservoir has not been described and shows the adaptability of these birds to human environments and their high capacity to find food in the most varied types of habitats.
  PubDate: 2024-10-01
  DOI: 10.1007/s10211-024-00447-7
Scared of the dark' Nychthemeral sociality in territorial black wildebeest
(Connnochaetes gnou) bulls
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  Abstract: Abstract The degree of prey sociality reflects trade-offs between predation risk, and competition for mates and resources. Consequently, the degree of sociality is predicted to differ spatiotemporally. Variations in nychthemeral sociality are, however, understudied. We assessed the activity of solitary, territorial black wildebeest bulls (Connochaetes gnou) over rutting and non-rutting seasons. We predicted that solitary bulls would reduce their nocturnal use of territorial stands and join herds to reduce predation risk from nocturnally hunting lions (Panthera leo), but that these responses would differ across rutting and non-rutting seasons. We used camera trap data and modelled solitary bull and herd activity over 24-hour daily cycles, across rutting and non-rutting seasons. We calculated the proportion of images with solitary bulls and herds across nocturnal and diurnal periods, across both seasons. We show that solitary bulls are predominantly diurnal across both seasons, but the probability of nocturnal detection is higher in the rutting than in the non-rutting season. Furthermore, we recorded a lower proportion of solitary bulls to herds at night in the non-rutting relative to the rutting season. Thus, wildebeest bulls may trade-off predation risk for mate acquisition during the rutting season but reduce risky solitary behaviour during the non-rutting season.
  PubDate: 2024-10-01
  DOI: 10.1007/s10211-024-00448-6
Assessing the impact of engine and non-engine urban noises on the calls of
urban frogs: a natural experiment
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  Abstract: Abstract Urban noise can potentially disturb the acoustic signals of animals inhabiting urban areas. Although a wide variety of noises from different sources is common in cities, the impact of non-engine noise on animal calls is less studied. In a natural experiment, we evaluated the effect of different urban noises on the advertisement calls of urban frogs (Eleutherodactylus nitidus) in the metropolitan area of Puebla, Mexico. We recorded and analyzed 672 advertisement calls from 28 male frogs and the corresponding environmental noises from three distinct localities. Our analysis focused on four acoustic properties of the calls: inter-call interval, call duration, dominant frequency, and call amplitude. To standardize the amplitude measurements of sound pressure levels produced by noise and frog calls, we employed a practical approach using a reference signal for calibration. We treated the longitudinal data of different noises occurring before, during, and after advertisement calls as repeated measures within the urban locations. During our samplings, frogs called amidst spontaneous urban noises, including dog barking, fireworks, and vehicle engine sounds. Our results indicate that vehicle engine sounds and dog barking do not cause significant distortions in the calls of these urban frogs. However, we observed slight variations in the dominant frequency of calls, decreasing by 11 Hz, during and after fireworks. Given the observed plasticity of E. nitidus in response to noise, urban noises may not pose a severe problem for this urban frog.
  PubDate: 2024-10-01
  DOI: 10.1007/s10211-024-00449-5
Alloparenting and family behaviours in leopards (Panthera pardus fusca)
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  Abstract: Abstract We documented alloparenting and social group behavior within a leopard (Panthera pardus fusca) population in the Jhalana Reserve Forest (JRF), northwest India. Our observations revealed subadult offspring assisting their mothers in raising their newborn litters, exhibiting previously undocumented alloparenting behaviors. We propose that the familial intra-specific interactions and inter-specific competition collectively influence the social structure of the leopard population. Specifically we suggest that the inter-specific competition and predation, particularly with striped hyenas (Hyaena hyaena), may encourage alloparenting in leopards. Aditionally, we hypothesize that alloparenting, combined with natal philopatry, serves as an alternative strategy for leopards to enhance the survival chances of their progeny.
  PubDate: 2024-08-09
  DOI: 10.1007/s10211-024-00446-8
Heterospecific mating interference in ladybird beetles: age dependent
patterns and consequences
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  Abstract: Abstract The ladybird beetles Cheilomenes sexmaculata and Propylea dissecta serve as effective bio-control agents, preying upon aphid populations and thereby mitigating plant damage. These beetles coexist together and show different reproductive strategies. Previous studies have found prevalent heterospecific mating between C. sexmaculata male and P. dissecta female, documenting the effects of heterospecific male C. sexmaculata on the reproductive output of P. dissecta female. In light of these observations, we conducted an experiment examining the influence of heterospecific male age on the reproductive output of P. dissecta. This study involved three age groups of male: (a) young (10–20 days), (b) middle (30–40 days), and (c) old (50–60 days). These males were introduced into Petri dishes with conspecific mates of P. dissecta. Across all experimental treatments, we examined the impact of three different age cohorts of C. sexmaculata males on the mating and reproductive attributes of P. dissecta. Our findings unveiled that older heterospecific males, which displayed reduced choosiness and heightened activity, engaged in reproductive interference to a greater degree than younger C. sexmaculata males during conspecific P. dissecta mating. Further, post-mating encounters with young heterospecific males led to a reduction in the reproductive output of female P. dissecta. The insights gained from this study hold significant implications for comprehending the feasibility of releasing multiple species of ladybird beetles within the same agricultural field. Such understanding of interspecies interactions and their consequences is vital for optimizing integrated pest management strategies.
  PubDate: 2024-07-26
  DOI: 10.1007/s10211-024-00445-9
Intra-sexual selection in a North American annual killifish: does the
color-polymorphism matter'
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  Abstract: Abstract The decision to escalate aggression in a contest is based on the assessment of oneself and the opponent's capabilities, previous experiences and the asymmetries between contenders. Interestingly, there is increasing evidence that color polymorphism may also influence the result in a contest during agonistic encounters. Therefore, this research aimed to analyze, for the first time, the intra-sexual competition of adult males of the Mexican Rivulus Millerichthys robustus, testing the influence of color polymorphic variations during agonistic contests. The results of this study suggest that the aggressiveness between morphotypes is of orange and red over yellow. The orange morph was related to winning the greatest number of encounters, whereas yellow lost the most. The red morpho registered the greatest number of ties. Interestingly, in contests between more aggressive morphs (orange and red), fish tended to modulate and lower aggressiveness levels, possibly to avoid injuries. In contrast, the least aggressive morphotype (yellow) tended to raise its aggressiveness against the most successful morphotype and lower it in matches against its own color, changing to a scheme between contenders with symmetrical aggression levels. These results suggest that differential aggression between morphotypes can influence the evolution of color polymorphism in M. robustus, differentially influencing the fitness of the individuals.
  PubDate: 2024-07-23
  DOI: 10.1007/s10211-024-00444-w
Correction to: Copulation behaviour in the Southern Lapwing (Vanellus
chilensis)
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  PubDate: 2024-06-28
  DOI: 10.1007/s10211-024-00443-x
Copulation behaviour in the Southern Lapwing (Vanellus chilensis)
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  Abstract: Abstract The Southern Lapwing (Vanellus chilensis) is a widespread bird across Southern America and commonly found in any large open areas, including agriculture and urban. Despite being a conspicuous species, little is known about its copulatory behaviour. In this research, we studied the copulation behaviour of Southern Lapwings and identified specific behaviours that preceded copulation events. Focal observations were made during one year on two pairs of lapwings that inhabit an urban area in the southeastern Pampas region, Argentina. A total of 110 intra-pair copulations were recorded (pair 1 = 64 and pair 2 = 46). Frequent copulations began 97 and 64 days before the first egg-laying, respectively, although the highest frequency occurred before the onset of the first nesting attempt. The Southern Lapwing copulated during all daylight hours, with a peak in the morning. Copulation occurred for up to five consecutive days, and the maximum number of copulations observed in a single day was four. Courtship and territory defence were the most common behaviours preceding copulation. Among the multiple hypotheses that have been proposed to explain frequent intra-pair copulation, our results seem to support two of them: the territory signalling hypothesis and the social bond hypothesis. The high population density coupled with the low availability of territories and a strong social bond based on cooperation and coordination could support both hypotheses, respectively. Given that the social environment can modify the behaviour of plovers, future research should evaluate the copulation behaviour at different population densities and the adaptive functional significance of this behaviour.
  PubDate: 2024-06-13
  DOI: 10.1007/s10211-024-00442-y
First record of mutual allogrooming in wild northern red muntjac Muntiacus
Vaginalis
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  Abstract: Abstract We report the first record of mutual allogrooming in free-ranging wild northern red muntjac (Muntiacus vaginalis) from dense tropical forests of Similipal Tiger Reserve, Odisha, India. This observation is similar to reciprocal allogrooming behaviour between social partners, reported only in Impala (Aepyceros melampus) in free-ranging conditions. We video-recorded cooperative allogrooming between two female (one adult and another juvenile) northern red muntjacs. Behavioural quantification suggests that although both individuals exchanged equal numbers of grooming bouts, the adult female received a greater share of grooming time and episodes, respectively. The time spent on grooming as well as the number of tongue strokes delivered were found to be negatively correlated between the two individuals. The grooming pattern could possibly be attributed to kin selection and detailed work is required to understand this behaviour in this poorly-studied primitive deer. Our record indicates the possible existence of cooperative allogrooming in other ungulates of the Order Artiodactyla.
  PubDate: 2024-06-07
  DOI: 10.1007/s10211-024-00441-z
Effect of parental age on developmental rate polymorphism of the ladybird
beetle, Propylea dissecta
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  Abstract: Abstract Parental age plays a major role in determining the life history attributes of an organism. Variation in parental age can have a big impact on offspring development, body mass and structure of population. To test the hypothesis that the increase in parental age has negative effects on offspring development of next generation, we observed the effect of parental age on the selected population of developmental variants (slow and fast developers) in a ladybird beetle, Propylea dissecta Mulsant (Coleoptera: Coccinellidae). The newly emerged adults were divided into two lines: Slow and Fast developers on the basis of their total developmental durations. Adult body mass, slow-fast emergence, sex-ratio, percentage of immature survival of newly emerged adults was recorded. Total developmental duration increased with the increase in age across generation and more fast developers were found in the offspring of young age groups; however, only slow developers were produced by old age groups. Offspring of older age showed higher immature mortality which supports slow-growth-higher mortality hypothesis. Thus, it can be concluded that young age beetles show better performance in terms of growth and developmental duration in P. dissecta in comparison to middle age and old age groups.
  PubDate: 2024-05-28
  DOI: 10.1007/s10211-024-00440-0
Females of the sailfin tetra prefer red illuminated environments
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  Abstract: Abstract The preference for colours has profound impacts on the fitness of visually oriented species, influencing the search for food resources and mates of better quality while also modulating various physiological and behavioural features. Such processes may be more important to sexually dimorphic species, especially coloured ones since visual signals play an important role in intra- and intersexual communication. Amazon small streams vary widely regarding the amount of dissolved organic carbon resulting in black (red-biased) and clear (mostly transparent) water types. The sailfin tetra Crenuchus spilurus is a small sexually dimorphic species composed of two main genetic lineages that live in black and clear water types. Recently, we have shown that the female sexual preference for male ornaments colouration differs between individuals inhabiting black and clear water types. Females from black waters do not choose males primarily based on colouration under strongly red-biased lighting, but females from clear waters do, which suggests that the importance of red colours for sexual behaviour differs between lineages of the sailfin tetra. Here, we evaluated the sailfin tetra female environmental colour preference through the choice between a red and a full spectrum illuminated environments. Females from black waters and clear waters preferred red-lightened environments. Such results suggest that the females are attracted to the red colouration outside the context of mating, irrespective of the prevailing lighting condition of their native environment. This preference for red illuminated environments may be important for several processes, including physiological and behavioural features.
  PubDate: 2024-05-02
  DOI: 10.1007/s10211-024-00439-7

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