Histopatological effects of bleaching and disease on the coral Siderastrea stellata from coastal reefs of Brazil

IF 0.5 4区生物学 Q4 ZOOLOGY Iheringia Serie Zoologia Pub Date : 2021-05-07 DOI:10.1590/1678-4766E2021007

C. F. C. Sassi, G. M. D. Farias, Amanda de S. Vasconcelos, Rebeca S. de Macedo, Jéssica P. de S. França, R. Sassi

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引用次数: 1

Abstract

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, diseases, and colonies with alteration in the color pattern promoted degradation of reproductive cells, resulting in the consequent interruption of the reproduction of the coral S. stellata, which is one of the most common Brazilian coral species. The implications of these indirect effects of bleaching, disease, and changes in coral color patterns in the population dynamics of Brazilian reefs are discussed.

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巴西沿海珊瑚礁白化和疾病对星状珊瑚的组织病理学影响

对1868年白色鼠疫病和颜色模式改变的Siderastrea stellata Verrill漂白标本进行组织学分析，发现严重的组织和细胞紊乱，如外上皮溶解，胃真皮增生，上皮细胞和虫黄藻凋亡，肠系膜丝和生殖细胞降解。真菌菌丝、硅藻和蓝藻存在于病变样品和菌落中，颜色模式发生改变。此外，漂白和病变样品显示，每100µm2胃真皮的虫黄藻数量显著减少，V期卵母细胞的直径和体积显著减少。我们发现，漂白事件、疾病和颜色模式改变的菌落促进了生殖细胞的降解，导致S. stellata珊瑚的繁殖中断，这是巴西最常见的珊瑚物种之一。讨论了这些漂白、疾病和珊瑚颜色模式变化的间接影响对巴西珊瑚礁种群动态的影响。

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来源期刊

Iheringia Serie Zoologia 生物-动物学

CiteScore

1.00

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Iheringia, Série Zoologia, edited by the “Museu de Ciências Naturais” of the “Fundação Zoobotânica do Rio Grande do Sul”, publishes original research findings in zoology with emphasis on taxonomy, systematics, morphology, natural history, and community or population ecology of species from current Neotropical fauna. Scientific notes will not be accepted for publication. Species lists without a taxonomic approach, or that are not the result of studies on the ecology or natural history of communities will not normally be accepted. The same applies to identification keys of groups of taxa defined by political boundaries. Authors wishing to inquire about the scope of the journal or the suitability of a particular topic are encouraged to contact the Editorial Board prior to submission. Furthermore, articles with a main focus on agronomy, veterinary, zootechny or other areas involving applied zoology will not be accepted. Its abbreviated title is Iheringia, Sér. Zool., which should be used in bibliographies, footnotes and bibliographical references and strips.