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Your search keyword '"Oliveira, Rui F."' showing total 409 results
Start Over Author "Oliveira, Rui F." Publication Type Academic Journals
409 results on '"Oliveira, Rui F."'

16. Social zebrafish: Danio rerio as an emerging model in social neuroendocrinology.

Author

Kareklas, Kyriacos, Teles, Magda C., Nunes, Ana Rita, and Oliveira, Rui F.

Subjects
ZEBRA danio, BRACHYDANIO, NEUROENDOCRINOLOGY, NEUROENDOCRINE system, FUNCTIONAL connectivity
Abstract

The fitness benefits of social life depend on the ability of animals to affiliate with others and form groups, on dominance hierarchies within groups that determine resource distribution, and on cognitive capacities for recognition, learning and information transfer. The evolution of these phenotypes is coupled with that of neuroendocrine mechanisms, but the causal link between the two remains underexplored. Growing evidence from our research group and others demonstrates that the tools available in zebrafish, Danio rerio, can markedly facilitate progress in this field. Here, we review this evidence and provide a synthesis of the state‐of‐the‐art in this model system. We discuss the involvement of generalized motivation and cognitive components, neuroplasticity and functional connectivity across social decision‐making brain areas, and how these are modulated chiefly by the oxytocin‐vasopressin neuroendocrine system, but also by reward‐pathway monoamine signaling and the effects of sex‐hormones and stress physiology. [ABSTRACT FROM AUTHOR]

Published
2023
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45. Differential Effects of Food Restriction and Warming in the Two-Spotted Goby: 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., and Faria, Ana Margarida

Subjects
SATURATED fatty acids, HIGH temperatures, OCEAN temperature, GOBIIDAE, WATER temperature, FISH eggs, FISH reproduction
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2022
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46. Phenotypic architecture of sociality and its associated genetic polymorphisms in zebrafish.

Author

Gonçalves, Claúdia, Kareklas, Kyriacos, Teles, Magda C., Varela, Susana A. M., Costa, João, Leite, Ricardo B., Paixão, Tiago, and Oliveira, Rui F.

Subjects
BRACHYDANIO, SINGLE nucleotide polymorphisms, PHENOTYPES, SOCIAL pressure, SOCIAL skills, ZEBRA danio, GENETIC polymorphisms
Abstract

Sociality relies on motivational and cognitive components that may have evolved independently, or may have been linked by phenotypic correlations driven by a shared selective pressure for increased social competence. Furthermore, these components may be domain‐specific or of general‐domain across social and non‐social contexts. Here, we used zebrafish to test if the motivational and cognitive components of social behavior are phenotypically linked and if they are domain specific or of general domain. The behavioral phenotyping of zebrafish in social and equivalent non‐social tests shows that the motivational (preference) and cognitive (memory) components of sociality: (1) are independent from each other, hence not supporting the occurrence of a sociality syndrome; and (2) are phenotypically linked to non‐social traits, forming two general behavioral modules, suggesting that sociality traits have been co‐opted from general‐domain motivational and cognitive traits. Moreover, the study of the association between single nucleotide polymorphisms (SNPs) and each behavioral module further supports this view, since several SNPs from a list of candidate "social" genes, are statistically associated with the motivational, but not with the cognitive, behavioral module. Together, these results support the occurrence of general‐domain motivational and cognitive behavioral modules in zebrafish, which have been co‐opted for the social domain. [ABSTRACT FROM AUTHOR]

Published
2022
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