Bacterial infection and coral bleaching

Article Abstract:

The vibrio AK-1 bacteria bleaches the stony corals, Oculina patagonica, by disrupting the symbioses between the coral hosts and algal cells. The extratentacular coenosarc of the coral tissue is bleached while the tentacular rim of the polyp is generally unaffected. Almost 70-90% of the algal cells are lost from the bleached areas, and the bleaching is affected by the seawater temperature. An increase in temperature decreases the resistance capacity of the corals and increases the infective capability of the bacterium.

Diseases, Bacterial infections, Animals, Animal diseases

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Coral polyp expulsion

Article Abstract:

Marine biologists have found widely abundant encrusting coral species living in warm, shallow waters reproduce using a rare form of asexual reproduction. The reproduction process involves budding rather than the more usual process of fragmentation. The corals appear to require fast-changing currents to propagate in this way since no evidence of asexual reproduction is found in corals living in deeper waters.

Demographic aspects, Testimony, Reproduction, Asexual, Asexual reproduction, Budding, Grafting (Horticulture)

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Delivery of a nematocyst toxin

Article Abstract:

In the cnidarians, the toxins for venom are stored in the tubules of the nematocysts and are translocated via the spirally located series of extended hollow tubular barbs, which looks like a multiheaded poisonous arrow. The toxin is present on the internal surface of the everted-discharged tubule and gets stored near the bases of the low barbs and their lumina.

Physiological aspects, Toxins, Coelenterata, Cnidarians, Nematocysts, Cnidocytes

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