| Texto completo | |
| Autor(es): Mostrar menos - |
Moreira, Gabriel Rodrigues Martins
;
De Lima Junior, Joao Manoel
;
Nomura, Cassiana Seimi
;
De Jesus, Jany Hellen Ferreira
;
Uher, Emmanuelle
;
Dufour, Aurelie
;
Do Noscimiento, Maria-Isabelle Marcus
;
Grover, Renaud
;
Migon, Christophe
;
Ferrier-Pages, Christine
;
Esposito, Breno Pannia
Número total de Autores: 11
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF TRACE ELEMENTS IN MEDICINE AND BIOLOGY; v. 89, p. 9-pg., 2025-06-01. |
| Resumo | |
Introduction: Scleractinian corals rely on symbiosis with Symbiodiniaceae, a family of marine dinoflagellates, for photosynthetic products, which sustains their growth in nutrient-poor environments. Manganese (Mn) is a critical element for photosynthesis as an essential cofactor for the oxygen-evolving complex of the photosynthetic machinery. Also, Mn is an essential metal involved in antioxidant mechanisms that maintain normal cellular function in heat stressed corals. Objectives: This study aims to investigate the effects of different Mn species on photosynthetic efficiency in the coral Stylophora pistillata under thermal stress. A Mn-alginate device for controlled Mn supplementation was developed for this purpose. Methods: Coral nubbins were exposed to the following Mn species: manganese(II) chloride (MnCl2), manganese(II) ethylenediamine-N,N '-disuccinate (MnEDDS), manganese(II) desferrioxamine (MnDFO), and manganese(III) citrate (MnCIT). Photosynthetic parameters were measured using fluorometry. Mn-alginate gel dishes were prepared for controlled release, and their impacts on coral health indicators were evaluated at 26 degrees C and 31 degrees C, including photosynthetic efficiency, oxygen production, and symbiont density. Results: Free Mn(II) (MnCl2) and MnEDDS significantly enhanced photosynthetic efficiency. Mn-alginate effectively delivered Mn in controlled bursts. Under thermal stress, Mn supplementation improved photosynthetic activity and favored symbiont density. Mn-alginate dishes were stable in seawater and biocompatible, releasing Mn optimally at elevated temperatures. Conclusion: Mn-alginate gel dishes are an efficient and safe method for improving coral photosynthesis and mitigating thermal stress impacts, supporting reef conservation efforts in a changing climate. (AU) | |
| Processo FAPESP: | 21/10894-5 - Bioveiculadores de minerais para corais e zooxantelas |
| Beneficiário: | Breno Pannia Esposito |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |