Stress responses to chemical alarm cues in Nile tilapia

2015 ◽  
Vol 149 ◽  
pp. 8-13 ◽  
Author(s):  
Fábio Henrique Carretero Sanches ◽  
Caio Akira Miyai ◽  
Cândido Ferreira Pinho-Neto ◽  
Rodrigo Egydio Barreto
Keyword(s):  
Stress Responses ◽  
Nile Tilapia ◽  
Alarm Cues ◽  
Chemical Alarm Cues

The ‘club’ cell and behavioural and physiological responses to chemical alarm cues in the Nile tilapia

2010 ◽  
Vol 43 (1) ◽  
pp. 75-81 ◽  
Author(s):  
Rodrigo Egydio Barreto ◽  
Augusto Barbosa Júnior ◽  
Ana Catarina Casari Giassi ◽  
Anette Hoffmann
Keyword(s):  
Nile Tilapia ◽  
Physiological Responses ◽  
Alarm Cues ◽  
Club Cell ◽  
Chemical Alarm Cues

scholarly journals Living in mixed species groups promotes predator learning in degraded habitats

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Douglas P. Chivers ◽  
Mark I. McCormick ◽  
Eric P. Fakan ◽  
Randall P. Barry ◽  
Maud C. O. Ferrari
Keyword(s):  
Predation Risk ◽  
Abiotic Factors ◽  
Alarm Cues ◽  
Learning Mechanisms ◽  
Trade Offs ◽  
Chemical Alarm Cues ◽  
Pomacentrus Amboinensis ◽  
Predator Foraging ◽  
Predator Learning ◽  
Predator Odour

AbstractLiving in mix-species aggregations provides animals with substantive anti-predator, foraging and locomotory advantages while simultaneously exposing them to costs, including increased competition and pathogen exposure. Given each species possess unique morphology, competitive ability, parasite vulnerability and predator defences, we can surmise that each species in mixed groups will experience a unique set of trade-offs. In addition to this unique balance, each species must also contend with anthropogenic changes, a relatively new, and rapidly increasing phenomenon, that adds further complexity to any system. This complex balance of biotic and abiotic factors is on full display in the exceptionally diverse, yet anthropogenically degraded, Great Barrier Reef of Australia. One such example within this intricate ecosystem is the inability of some damselfish to utilize their own chemical alarm cues within degraded habitats, leaving them exposed to increased predation risk. These cues, which are released when the skin is damaged, warn nearby individuals of increased predation risk and act as a crucial associative learning tool. Normally, a single exposure of alarm cues paired with an unknown predator odour facilitates learning of that new odour as dangerous. Here, we show that Ambon damselfish, Pomacentrus amboinensis, a species with impaired alarm responses in degraded habitats, failed to learn a novel predator odour as risky when associated with chemical alarm cues. However, in the same degraded habitats, the same species learned to recognize a novel predator as risky when the predator odour was paired with alarm cues of the closely related, and co-occurring, whitetail damselfish, Pomacentrus chrysurus. The importance of this learning opportunity was underscored in a survival experiment which demonstrated that fish in degraded habitats trained with heterospecific alarm cues, had higher survival than those we tried to train with conspecific alarm cues. From these data, we conclude that redundancy in learning mechanisms among prey guild members may lead to increased stability in rapidly changing environments.

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