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bio 315 lec 23
the rising tide of ocean plagues
10
Biology
Undergraduate 3
04/18/2009

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Term
what categories of disease are affecting corals and contributing to their die offs?
Definition
black band disease, bleaching, white plagues
Term
how does overfishing, urchin pathogens affect coral abundance?
Definition
when fish and urchin levels decline there is nothing to feed on the algae,
algae levels grow and outcompete coral leading to their decline
Term
why are marine diseases spreading more rapidly than terrestrial ones?
Definition
water currents carry pathogens quickly and to new areas
land pathogens can get into the water from run offs
Term
what is aspergillus sydowii?
Definition
marine fungal pathogen that originated from a terrestrial run off (host shift)
causes purpling of sea plants, necrosis
Term
what are some drivers of ocean disease?
Definition
climate change
eutrophication
coastal population density---> runoffs, urbanization
Term
what is coral bleaching?
Definition
loss of zooxanthellae symbiont
increasing frequency and severity
induced by elevated sea temps/ symptom of thermal stress
Term
what is the saharan dust hypothesis?
Definition
Term
what are red tides?
Definition
harmful algal blooms, 1 species growing out of control
produce toxic substances that can get into the food that humans eat
Term
what is toxoplasma gondii? what species was affected? how did the pathogen get into the
water?
Definition
newly introduced water pathogen
affected sea otters
runoff into the sea from pet feces on land, sewage treatment, feral cat colonies
Term
what MHC genes?
Definition
highly polymorphic loci that control immune system self/nonself recognition
females selectively mate with male with genes that will enhance immune system of
her progeny
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