Venha conhecer os trabalhos premiados do Prémio de Doutoramento em Ecologia Fundação Amadeu Dias 2020.
Os 3 vencedores apresentarão o trabalho que lhes valeu a vitória nesta renhida edição do Prémio de Doutoramento em Ecologia.
Esta sessão será transmitida em directo do canal do youtube da SPECO
Trasmissão em directo no youtube
José Ricardo Paula
Cleaning stations in a changing ocean: Bio ecologicalCleaning stations in a changing ocean: Bio ecologicalresponses of cleaning mutualisms to ocean warming and acidification
Symbiotic relationships reveal interesting adaptations to deal with challenging marine environments. One of the most charismatic symbiosis is the mutualism between cleaner fishes and their clients. In this case, small fishes occupy specific territories, known as “cleaning stations” and provide a service to their clients, eating ectoparasites and dead tissue. To engage in cleaning interactions, cleaner wrasses (Labroides dimidiatus) evolved a set of cognitive and behavioural tools. Yet, the ecological conditions where cleaning symbiosis evolved are changing due to human- induced environmental stressors, such as ocean warming and ocean acidification. The present dissertation aimed to understand, within a multidisciplinary and integrative approach, how cleaning symbiosis respond to ocean warming and acidification (OWA). More specifically, this dissertation centred around two major research questions: 1) “Is cooperative cleaning behaviour affected by OWA? If so, what are the neurobiological mechanisms and is there potential for adaptation?” 2) “Are parasites resilient to OWA? If so, how they impact client fishes and how their abundance can be controlled?”. In Chapter 2 and 3, I show that both OWA can affect cleaning behaviour through the disruption of dopaminergic, serotoninergic and GABAergic systems. Yet, in Chapter 4, cleaner wrasse cognitive performance, although impacted by OA, presented a certain potential for adaptation through directional selection. Regarding the second question, Chapter 5 reveals that ectoparasites are tolerant to OA, while Chapter 6 shows that only clients without access to cleaning services were physiologically affected by OA. Lastly, Chapter 7 shows that corals control gnathiids abundance and loss of coral cover from extreme events, such as mass bleaching, can decrease by 80% the predation on gnathiids. In conclusion, this dissertation shows that OWA can disturb cleaning symbiosis through behavioural changes mediated by neurobiological changes. Although there is some potential for adaptation, the combination of these climatic stressors and the unpredictability of extreme events renders the probability of adaptation. Finally, it is important to note that this disruption can lead to cascade effects on coral reef ecosystems, since the need for cleaning services can increase with a greater abundance of CO2-tolerant gnathiid ectoparasites (due to decreased abundance control).