Effects of predator odour on antipredator responses of Nile tilapia

Miyai, Caio Akira; Sanches, Fábio Henrique Carretero; Pinho-Neto, Cândido Ferreira; Barreto, Rodrigo Egydio

doi:10.1016/j.physbeh.2016.06.033

Cited by 18 publications

(9 citation statements)

References 78 publications

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“…In experiment two, the sociability of the O. amphimelas pair was unaffected by the presence of O. niloticus, and there was little evidence for a difference in activity between stimulus and control trials. Under the risk of potential predation, reduced activity (Sanches et al 2015;Miyai et al 2016;Ioannou et al 2017) and increased sociability (Ioannou 2020;Romenskyy et al 2020) are known behavioural responses, however neither were observed in this experiment when the stimulus chamber contained the O. niloticus. This niloticus through avoidance behaviours.…”

Section: Discussionmentioning

confidence: 53%

Simulated encounters with a novel competitor reveal the potential for maladaptive behavioural responses to invasive species

et al. 2021

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During the early stage of biological invasions, interactions occur between native and non-native species that do not share an evolutionary history. This can result in ecological naïveté, causing native species to exhibit maladaptive behavioural responses to novel enemies, leading to negative consequences for individual fitness and ecosystem function. The behavioural response of native to non-native species during novel encounters can determine the impact of non-native species, and restrict or facilitate their establishment. In this study we simulated novel encounters between a widespread invasive fish species, the Nile tilapia (Oreochromis niloticus), and a threatened native Manyara tilapia (Oreochromis amphimelas). In the first experiment single adult O. niloticus were presented with a stimulus chamber (a transparent plastic cylinder) which was empty during control trials and contained a pair of juvenile O. amphimelas in stimulus trials. In the second experiment, the reciprocal set up was used, with pairs of juvenile O. amphimelas as the focal species and adult O. niloticus as the stimulus. Both species approached the stimulus chamber more readily during stimulus trials, a behavioural response which would increase the prevalence of interspecific interactions in situ. This included physical aggression, observed from the competitively dominant O. niloticus towards O. amphimelas. Despite an initial lack of fear shown by O. amphimelas, close inspection of the stimulus chamber often resulted in an energetically costly dart response. Under field conditions we predict that naïve native individuals may readily approach O. niloticus, increasing the likelihood of interactions and exacerbating widely reported negative outcomes.

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Section: Discussionmentioning

confidence: 53%

Simulated encounters with a novel competitor reveal the potential for maladaptive behavioural responses to invasive species

et al. 2021

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“…To assess the swimming activity, I put a grid design on the back wall of the aquarium that had nine identical quadrants and quantified the frequency of quadrants changes (Barreto et al 2010;Miyai et al 2016). The presence of an animal in one quadrant was scored considering the bigger part of a fish body that was inside a quadrant.…”

Section: Fish Behaviormentioning

confidence: 99%

Mianserin affects alarm reaction to conspecific chemical alarm cues in Nile tilapia

Barreto

2016

Fish Physiol Biochem

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In this study, I show that mianserin, a chemical with serotonin and adrenoceptor antagonist activities, increases fish vulnerability to a potential predator threat, when prey fish must deal with this threat based on conspecific chemical alarm cues. For that, I evaluated whether mianserin, diluted in the water, influences the behavioral responses of Nile tilapia (Oreochromis niloticus) to conspecific skin extract (chemical alarm cues). I found that, while mianserin did not abolished antipredator responses, this drug mitigates some components of this defensive reaction. Thus, a potential decrease in serotonin and adrenergic activities reduces the ability of dealing with predators when perceiving conspecific chemical alarm cues.

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“…In vertebrates, the primary response to stress is a rapid elevation in glucocorticoids (such as cortisol or corticosterone), which quickly releases glucose into the blood priming the body for increased activity if required (secondary stress response) [ 43 ]. As such, olfactory cues of risk have been shown to alter the behaviour and physiology in fishes [ 44 , 45 ]. For instance, risk cues have been shown to increase cortisol concentrations and induce defensive behaviours in zebrafish ( Danio rerio ) [ 46 ], likely in anticipation of an imminent threat.…”

Section: Introductionmentioning

confidence: 99%

Habitat complexity and predator odours impact on the stress response and antipredation behaviour in coral reef fish

et al. 2023

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Mass coral bleaching events coupled with local stressors have caused regional-scale loss of corals on reefs globally. Following the loss of corals, the structural complexity of these habitats is often reduced. By providing shelter, obscuring visual information, or physically impeding predators, habitat complexity can influence predation risk and the perception of risk by prey. Yet little is known on how habitat complexity and risk assessment interact to influence predator-prey interactions. To better understand how prey’s perception of threats may shift in degraded ecosystems, we reared juvenile Pomacentrus chrysurus in environments of various habitat complexity levels and then exposed them to olfactory risk odours before simulating a predator strike. We found that the fast-start escape responses were enhanced when forewarned with olfactory cues of a predator and in environments of increasing complexity. However, no interaction between complexity and olfactory cues was observed in escape responses. To ascertain if the mechanisms used to modify these escape responses were facilitated through hormonal pathways, we conducted whole-body cortisol analysis. Cortisol concentrations interacted with habitat complexity and risk odours, such that P. chrysurus exhibited elevated cortisol levels when forewarned with predator odours, but only when complexity levels were low. Our study suggests that as complexity is lost, prey may more appropriately assess predation risk, likely as a result of receiving additional visual information. Prey’s ability to modify their responses depending on the environmental context suggests that they may be able to partly alleviate the risk of increased predator-prey interactions as structural complexity is reduced.

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Effects of predator odour on antipredator responses of Nile tilapia

Cited by 18 publications

References 78 publications

Simulated encounters with a novel competitor reveal the potential for maladaptive behavioural responses to invasive species

Simulated encounters with a novel competitor reveal the potential for maladaptive behavioural responses to invasive species

Mianserin affects alarm reaction to conspecific chemical alarm cues in Nile tilapia

Habitat complexity and predator odours impact on the stress response and antipredation behaviour in coral reef fish

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