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Histopatological effects of bleaching and disease on the coral Siderastrea stellata from coastal reefs of Brazil Iheringia, Sér. Zool.
Sassi,Cristiane F. Costa; Farias,Gabriel M. de; Vasconcelos,Amanda de S.; Macedo,Rebeca S. de; França,Jéssica P. de S.; Sassi,Roberto.
ABSTRACT Histological analysis of bleached samples of Siderastrea stellata Verrill, 1868, with white plague disease and with alteration in the color pattern, revealed drastic tissue and cellular disturbances, such as lysis of the external epithelium, hyperplasia of gastrodermis, apoptosis of epithelial cells and zooxanthellae, and degradation of mesenteric filaments and reproductive cells. Fungal hyphae, diatoms, and cyanobacteria were present in diseased samples and colonies with alteration in the color pattern. Furthermore, bleached and diseased samples showed significant reductions in the number of zooxanthellae per 100 µm2 of gastrodermis and significant reductions in the diameters and volumes of stage V oocytes. We found that bleaching events,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazilian reefs; Coral diseases; Coral bleaching; Histopathology; Cellular disturbances.
Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212021000100207
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MECHANISMS OF IMMUNE RESPONSES IN CNIDARIANS Acta biol.Colomb.
OCAMPO,Iván Darío; CADAVID,Luis F.
The immune system maintains the integrity of the organisms through a complex network of molecules, cells, and tissues that recognize internal or external antigenic substances to neutralized and eliminate them. The mechanisms of immune response have evolved in a modular fashion, where members of a given module interact strongly among them, but weakly with members of other modules, providing robustness and evolvability to the immune system. Ancestral modules are the raw material for the generation of new modules through evolution. Thus, the study of immune systems in basal metazoans such as cnidarians seeks to determine the basic tool kit from which the metazoans started to construct their immune systems. In addition, understanding the immune mechanisms in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coral diseases; Cnidarian immunity; Evolutionary immunology.
Ano: 2015 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2015000200001
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