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AH Biology Environmental Biology

AH Biology Environmental Biology. Homeostasis and Estuarine Animals. Estuaries – a stressed habitat. Tidal movements results in:. Variable abiotic factors: Salinity Temperature Oxygen Density. http://vimeo.com/4997994. Organisms can respond to change by:. Osmoconformers.

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AH Biology Environmental Biology

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  1. AH BiologyEnvironmental Biology Homeostasis and Estuarine Animals

  2. Estuaries – a stressed habitat

  3. Tidal movements results in: Variable abiotic factors: • Salinity • Temperature • Oxygen • Density

  4. http://vimeo.com/4997994 Organisms can respond to change by:

  5. Osmoconformers • Their blood concentration varies with the environment, ie they passively tolerate changes in salinity • eg jellyfish, squid

  6. Osmoregulators • 1. Hyper/Iso Regulation • When the conc. is low the organism keeps its internal conc. hypertonic (less water) to the external conc. As the salt concentration rises it reaches a point where it can no longer control and becomes isotonic. • eg Corophium

  7. 2. Hyper/Hypo Regulation • At the freshest conc. the organism is hypertonic but as conc. increases it becomes hypotonic. • eg prawn

  8. How do they do it? • Contractile vacuoles • Chloride secretory cells, etc

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