MSC 111 Lecture 22: MSC 111 Physical Factors Affecting Marine life

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How much light energy is available fro primary production. Photic zone: layer to which light penetrates (physics) Euphotic zone: where marine plants trap more energy than they use (biology) Deepest euphotic zone in mediterranean about 150 m. Light can be absorbed (heat) or scattered (change direction) Deep ocean appears blue because wavelengths we see are least absorbed. Coastal waters appear green because plant pigments absorb blue and red pigments. Light levels decrease exponentially as depth increases. Metabolic rate is rate at which energy-releasing reactions proceed within an organism. Doubles with 10 degrees celsius temperature rise (q10): q10 effect- enzymes follow specific relationship. Subtropical gyres have high rates of metabolism. E(cid:272)tother(cid:373)s (cid:894)(cid:862)(cid:272)old-(cid:271)looded(cid:863)(cid:895)- animals that have temperatures close to external temperatures. Barnacles- population expands when bay of biscay and english channel waters warm. Stress at extremes on physiology- zone of tolerance. E(cid:374)dother(cid:373)s(cid:894)(cid:862)(cid:449)ar(cid:373) (cid:271)looded(cid:863)(cid:895)- animals that can maintain almost a constant internal temperature. Requires high energy expenditure in cold environments.

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