Epidemic mortality of the sponge Ircinia variabilis (Schmidt, 1862) associated to proliferation of a Vibrio bacterium.

Microbial Ecology
Loredana StabiliElda Gaino

Abstract

In recent years, several episodes of mass mortality of sessile epibenthic invertebrates, including sponges, have been recorded worldwide. In the present study, we report a disease event on Ircinia variabilis recorded in September 2009 along the southern Adriatic and Ionian seas (Apulian coast), with the aim to quantify the mortality incidence on the sponge population, to investigate the effect of the disease on the sponge tissues and to assess whether the disease is associated with vibrios proliferation. The injured sponges showed wide necrotic areas on the surface or disruption of the body in several portions. Necrotic areas were whitish and often were covered with a thin mucous coat formed by bacteria. In the most affected specimens, sponge organisation resulted partial or complete loss, with the final exposure of the dense skeletal network of spongine fibres to the environment. The results of microbiological cultural analysis using in parallel Marine Agar 2216 and thiosulphate/citrate/bile salts/sucrose agar demonstrated that, in affected specimens, vibrios represented 15.8 % of the total I. variabilis surface culturable bacteria. Moreover, all the isolated vibrios, grown from the wide whitish areas that characterize the sur...Continue Reading

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Citations

May 15, 2015·PloS One·Cristina Gioia Di Camillo, Carlo Cerrano
Nov 5, 2016·Marine Environmental Research·Esther Rubio-PortilloAlfonso A Ramos-Esplá
Nov 9, 2016·Critical Reviews in Microbiology·Ganesan SathiyanarayananJoseph Selvin
Aug 14, 2012·Applied and Environmental Microbiology·Patrick M ErwinXavier Turon
Dec 29, 2020·Journal of Invertebrate Pathology·Charlotte E Davies
Nov 22, 2017·International Journal of Biological Macromolecules·Sayak BhattacharyaJoydeep Mukherjee

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