The role of tactile interactions in flight responses in the Bronze Cory catfish<i>(Corydoras aeneus)</i>

Riley, Riva J; Gillie, Beth R; Jungwirth, Arne; Savage, James L.; Boogert, Neeltje J.; Manica, Andrea

doi:10.1101/449272

Cited by 3 publications

(4 citation statements)

References 26 publications

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“…We are confident that, on the whole, these nudges represented directed interactions from the initiator to the recipient. While it cannot be excluded with absolute certainty that some tactile interactions were the result of unintentional collisions between individuals, we have also shown that during flight responses, individuals who perceive a threat earlier are more likely to initiate nudges with group-mates [15]. These findings add support to our interpretation that nudging is a directed interaction between individuals (as demonstrated in our electronic supplement video).…”

Section: Video Scoringsupporting

confidence: 86%

“…This highly social neotropical species exhibits an unusual behaviour during coordinated activities whereby individuals often nudge each other. We first noticed this behaviour in wild fish (Riley 2011, personal observation) and have since observed that this nudging behaviour occurs during both foraging and group flight responses to potential threats, in which nudging improves coordination ([15]; for a demonstration of this behaviour, see the example video provided in the electronic supplementary material). Individuals also use nudges when initiating and participating in group movements.…”

Section: Introductionmentioning

confidence: 99%

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Coping with strangers: how familiarity and active interactions shape group coordination in Corydoras aeneus

et al. 2019

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Social groups composed of familiar individuals exhibit better coordination than unfamiliar groups; however, the ways familiarity contributes to coordination are poorly understood. Prior social experience probably allows individuals to learn the tendencies of familiar group-mates and respond accordingly. Without prior experience, individuals would benefit from strategies for enhancing coordination with unfamiliar others. We used a social catfish, Corydoras aeneus , that uses discrete, observable tactile interactions to assess whether active interactions could facilitate coordination, and how their role might be mediated by familiarity. We describe this previously understudied physical interaction, ‘nudges’, and show it to be associated with group coordination and cohesion. Furthermore, we investigated nudging and coordination in familiar/unfamiliar pairs. In all pairs, we found that nudging rates were higher during coordinated movements than when fish were together but not coordinating. We observed no familiarity-based difference in coordination or cohesion. Instead, unfamiliar pairs exhibited significantly higher nudging rates, suggesting that unfamiliar pairs may be able to compensate for unfamiliarity through increased nudging. By contrast, familiar individuals coordinated with comparatively little nudging. Second, we analysed nudging and cohesion within triplets of two familiar and one unfamiliar individual (where familiar individuals had a choice of partner). Although all individuals nudged at similar rates, the unfamiliar group-mate was less cohesive than its familiar group-mates and spent more time alone. Unfamiliar individuals that nudged their group-mates more frequently exhibited higher cohesion, indicating that nudging may facilitate cohesion for the unfamiliar group-mate. Overall, our results suggest that nudges can mitigate unfamiliarity, but that their usage is reduced in the case of familiar individuals, implying a cost is associated with the behaviour.

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Section: Video Scoringsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Coping with strangers: how familiarity and active interactions shape group coordination in Corydoras aeneus

et al. 2019

Self Cite

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“…It is interesting that the ABF of groups was also affected by social cohesion, in that the more cohesive the group the greater the ABF. In bronze corydoras, individuals that are close to each other can better utilise social cues and may also perceive less risk because there are other individuals in their immediate vicinity ( Riley et al, 2019 ). A more remote possibility could be that, if individuals are closer together, they may reduce the amount of oxygen available for others in the group ( Nadler et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…Behavioural observations were recorded using a remotely operated Panasonic 4K video camcorder (Panasonic HC-VX980EB-K) mounted above the arena. The recordings were taken from above as bronze corydoras are bottom dwelling and mainly shoal in two dimensions, so social behaviour can be accurately measured from this angle ( Riley et al, 2019 ).…”

Section: Methodsmentioning

confidence: 99%

Social dynamics obscure the effect of temperature on air breathing in Corydoras catfish

Pineda

Aragao

McKenzie

et al. 2020

Journal of Experimental Biology

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In some fishes, the ability to breathe air has evolved to overcome constraints in hypoxic environments but comes at a cost of increased predation. To reduce this risk, some species perform group air breathing. Temperature may also affect the frequency of air breathing in fishes, but this topic has received relatively little research attention. This study examined how acclimation temperature and acute exposure to hypoxia affected the air-breathing behaviour of a social catfish, the bronze corydoras Corydoras aeneus, to determine whether individual oxygen demand influenced the behaviour of entire groups. Groups of seven fish were observed in an arena to measure air-breathing frequency of individuals and consequent group air-breathing behaviour, under three oxygen concentrations (100%, 60%, 20% air saturation) and two acclimation temperatures (25°C & 30°C). Intermittent flow respirometry was used to estimate oxygen demand of individuals. Increasingly severe hypoxia increased air-breathing at the individual and group levels. While there were minimal differences in air-breathing frequency among individuals in response to an increase in temperature, the effect of temperature that did exist manifested as an increase in group air-breathing frequency at 30°C. Groups that were more socially cohesive during routine activity took more breaths but, in most cases, air-breathing among individuals this was not temporally clustered. There was no association between an individual's oxygen demand and its air-breathing frequency in a group. For Corydoras aeneus, while air-breathing frequency is influenced by hypoxia, behavioural variation among groups could explain the small overall effect of temperature on group air-breathing frequency.

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The development of social interactions inCorydoras aeneuslarvae

Riley

Roe

Gillie

et al. 2018

Preprint

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9 10 Very young animals develop life skills as they mature, and for social animals this 11 includes the acquisition of social abilities such as communication. Many animals exhibit 12 changeable patterns of social behavior based on development, and social experience during the 13 juvenile period can be vital for the development of necessary social behaviors in adulthood. We 14 investigated the development of a distinctive tactile interaction behavior in Corydoras aeneus, 15 the Bronze Cory catfish. Adults use this behavior to coordinate group activities during foraging 16 and flight responses from predators, and the development of this behavior in larvae is of interest 17 in investigating how communication and social behaviors develop as an individual matures, and 18which factors affect their development. We found that larvae respond to applied tactile 19 stimulation with a flight response far less often as larvae matured, implying that larvae become 20 less sensitive to tactile stimulation with age. Given that adults frequently interact with one 21 another tactilely, this development is consistent with developing appropriate social behavior in 22 adulthood. We also found that social exposure affects the development of the larval response to 23 tactile interactions with conspecifics, and that isolation in the earliest larval stage leads to a 24 greater likelihood of responding to a tactile interaction with a conspecific with a flight response. 25This suggests that social exposure is important for developing an appropriate response to tactile 26 stimulation in social settings and underscores the particular importance of early life experiences 27 in the development of sociality. 28

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The role of tactile interactions in flight responses in the Bronze Cory catfish(Corydoras aeneus)

Cited by 3 publications

References 26 publications

Coping with strangers: how familiarity and active interactions shape group coordination in Corydoras aeneus

Coping with strangers: how familiarity and active interactions shape group coordination in Corydoras aeneus

Social dynamics obscure the effect of temperature on air breathing in Corydoras catfish

The development of social interactions inCorydoras aeneuslarvae

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