BIOL 350 Lecture Notes - Lecture 10: Chondrichthyes, Jellyfish, Osmoregulation
Document Summary
Organisms vary in their tolerance to different solute concentrations. Stenohaline function within a fairly small range (cid:272)a(cid:374)"t tolerate (cid:373)u(cid:272)h (cid:272)ha(cid:374)ge i(cid:374) os(cid:373)olarit(cid:455) Euryhaline can survive much larger fluctuations in the external osmolality they can adjust e. g. barnacles and muscles. Aquatic organisms: water is not limited: water balance is physiological. Terrestrial organisms: problem of acquiring water: water balance is physiological, behavioural and requires evolutionary adaptations slide 23 time frame of adaptations to different salt concentrations genetic adaptation: conditions change over evolutionary time, ex. Phenotypic plasticity: conditions change from one generation to the next: ex. Urine very diluted: salt water: resist the loss of water from their tissues. Both osmoconformers and osmoregulators can be stenohaline or euryhaline. Osmoconformer: save energy: conformers still regulate intracellular ions and water volumes (just not to same extent as osmoregulators) Many marine vertebrates and some marine invertebrates as osmoregulators.
