Biology 3601A/B Lecture Notes - Lecture 3: Bicarbonate, Acclimatization
11 Apr 2018
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Co2 dissolves in the ocean +h20 carbonic. Ph levels are decreasing rapidly acidifying oceans dropping 0. 5 ph units by 2050 + decreased mr. Ph is a log scale so its amplified by 10 fold decrease of 0. 1 ph unit= 30% increase in h+ ions (lowers ph) Need ph le(cid:448)els to (cid:271)e atleast at (cid:373)i(cid:374)i(cid:373)u(cid:373) threshold i(cid:374) the o(cid:272)ea(cid:374) or else orga(cid:374)is(cid:373)s (cid:272)a(cid:374)"t (cid:373)ake their shells/skeletons. 2- -> caco3: calcium carbonate needed to make shells/skeletons of aquatic organisms: aragonite: sensitive to degradation, found in snails (gastropods), cephalopods (squids), corals, calcite: resistant to degradation, found in crustaceans, bivalves, trilobites (eye lenses) Organisms that experience high co2 concentrations in oceans have decreased mr (strategy) By measuring mr, (cid:449)e (cid:272)a(cid:374) see (cid:449)hat"s going on in the organism. Short-term strategy to avoid the effects of high co2 levels and low ph: adapt evolutionary change slow process, acclimatise phenotypic plasticity/adjusting to evmt faster process. 3 sensitive worms to high co2+low ph levels.
