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Your search keyword '"Oliveira, Rui F."' showing total 244 results
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244 results on '"Oliveira, Rui F."'

28. Impaired Reproductive Performance and Stressed Offspring

Author

Lopes, Ana F., Murdoch, Robyn, Martins-Cardoso, Sara, Madeira, Carolina, Costa, Pedro M., Félix, Ana S., Oliveira, Rui F., Bandarra, Narcisa M., Vinagre, Catarina, Lopes, Ana R., Gonçalves, Emanuel J., Faria, Ana Margarida, UCIBIO - Applied Molecular Biosciences Unit, and DCV - Departamento de Ciências da Vida

Subjects
ocean warming, reproduction, Ecology, food availability, Pomatochistus flavescens, SDG 13 - Climate Action, SDG 14 - Life Below Water, Aquatic Science, Ecology, Evolution, Behavior and Systematics, behaviour
Abstract

Publisher Copyright: © 2022 by the authors. Climate change is a growing threat to marine organisms and ecosystems, and it is already modifying ocean properties by, for example, increasing temperature and decreasing pH. Increasing water temperature may also lead to an impairment of primary productivity and an overall depletion of available zooplankton. Understanding how the crossover between warming and zooplankton availability impacts fish populations has paramount implications for conservation and mitigation strategies. Through a cross factorial design to test the effects of ocean temperature and food availability in a temperate marine teleost, Pomatochistus flavescens, we showed that hindered feeding impacted sheltering and avoidance behaviour. Also, low food availability impaired fish reproduction, particularly male reproduction, as the expression of cyp11b1, a gene with a pivotal role in the synthesis of the most important fish androgen, 11-ketotestosterone, was significantly reduced under a low food regime. In contrast, temperature alone did not affect reproductive success, but offspring showed increased saturated fatty acid content (embryos) and increased lipid peroxidation (larvae). Altogether, food availability had a stronger effect on fitness, showing that coping with elevated temperatures, an ability that may be expected in shallow-water fish, can be indirectly impacted, or even overwhelmed, by the effects of ocean warming on primary productivity and downstream ecological processes. publishersversion published

Published
2022

29. Differential Effects of Food Restriction and Warming in the Two-Spotted Goby: Impaired Reproductive Performance and Stressed Offspring

Author

Lopes, Ana F., primary, Murdoch, Robyn, additional, Martins-Cardoso, Sara, additional, Madeira, Carolina, additional, Costa, Pedro M., additional, Félix, Ana S., additional, Oliveira, Rui F., additional, Bandarra, Narcisa M., additional, Vinagre, Catarina, additional, Lopes, Ana R., additional, Gonçalves, Emanuel J., additional, and Faria, Ana Margarida, additional

Published
2022
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31. Fishing for Sociality: How What We See Helps us With Social Interactions

Author

Nunes, Ana Rita, Félix, Ana S., and Oliveira, Rui F.

Subjects
General Medicine
Abstract

Far in the distance, you see something moving...is it a woman? When you look closely, you recognize the motion pattern and body form: it is definitely your mother. As she approaches, you recognize her face and see that she is moving quickly; you can guess that she is worried because you are late for lunch! Humans can visually distinguish others, their emotions, and their intentions by looking at how they move and the shapes of their bodies. But individuals with social difficulties like autism struggle to get the same information from these visual cues. So, it is important for doctors and scientists to understand how the brain perceives this information. In our work, we studied small fish that rely on visual characteristics, the way we do, to recognize their fellows, and we explored how cues from movement and body shape help these fish to interact with others.

Published
2022

50. Innate chemical, but not visual, threat cues have been co‐opted as unconditioned stimulus for social fear learning in zebrafish.

Author

Pinho, Julia S., Castilho, Marisa, Sollari, Joao S., and Oliveira, Rui F.

Subjects
SOCIAL learning, FUNCTIONAL connectivity, LEARNING in animals, ASSOCIATIVE learning, OLFACTORY bulb, ZEBRA danio
Abstract

Animals can use social information to detect threat in the environment. In particular, social learning allows animals to learn about dangers without incurring in the costs of trial‐and‐error learning. In zebrafish, both chemical and visual social cues elicit an innate alarm response, which consists of erratic movement followed by freezing behavior. Injured zebrafish release an alarm substance from their skin that elicits the alarm response. Similarly, the sight of conspecifics displaying the alarm response can also elicit the expression of this response in observers. In this study, we investigated if these social cues of danger can also be used by zebrafish as unconditioned stimulus (US) in learning. We found that only the chemical cue was effective in the social fear conditioning. We suggest that this differential efficacy of social cues results from the fact that the alarm cue is a more reliable indicator of threat, than the sight of an alarmed conspecific. Therefore, although multiple social cues may elicit innate responses not all have been evolutionarily co‐opted to act as US in associative learning. Furthermore, the use of the expression of the immediate early genes as markers of neuronal activity showed that chemical social fear conditioning is paralleled by a differential activation of the olfactory bulbs and by a different pattern of functional connectivity across brain regions involved in olfactory processing. [ABSTRACT FROM AUTHOR]

Published
2020
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