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Gwen Noda

Science Magazine: Sign In - 0 views

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    Keeping Coral Clean

    Seaweed overgrowth is a major problem for coral reefs and also seems to be a consequence of excessive harvesting of herbivorous fish. Dixson and Hay (p. 804) examined this effect on Fijian reefs. Species of small herbivorous gobies and coral-associated damselfish were compared for their effect on the toxic Chlorodesmis seaweed in experiments that required caging colonies of the branching coral Acropora nasuta and the associated fish species. Only the gobies actively removed algal fronds attached to the cages and only one species (itself toxic to predators) ate them; the damselfish simply defected from the arena when toxic algae were present. The hydrophobic toxins exuded in the algal mucus lysed coral polyps releasing cell constituents that, together with the algal toxin, attract the gobies, which then eat the algal fronds. Interestingly, the toxic goby became more toxic to predators after consumption of the seaweed, which may help to drive symbiosis with a coral colony.
Gwen Noda

Back from the dead: 800,000-year-old plankton - CBS News - 0 views

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    Not really back from the dead:
    A single-celled alga that went extinct in the North Atlantic Ocean about 800,000 years ago has returned after drifting from the Pacific through the Arctic thanks to melting polar ice. And while its appearance marks the first trans-Arctic migration in modern times, scientists say it signals something potentially bigger.
Gwen Noda

Harmful Algae : Red Tide - 0 views

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    Harmful Algae

    This website from NOAA and the Woods Hole Oceanographic Institution is meant to serve as a comprehensive resource for information about harmful algal blooms (HABs). Links include basic information about HABs, how they affect humans and ecosystems, the latest HAB news, and information about meetings and conferences.
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