Homeostasis in Estuarine Animals: Adapting to Variable Environments
Estuaries are unique habitats with fluctuating abiotic factors such as salinity, temperature, oxygen, and density caused by tidal movements. To survive in these stressful environments, organisms employ various strategies. Osmoconformers, like jellyfish and squid, adjust their blood concentration to match surrounding water. In contrast, osmoregulators maintain specific internal concentrations, using mechanisms such as contractile vacuoles and chloride secretory cells to cope with salinity changes. Understanding these adaptations is crucial for conserving estuarine biodiversity.
Homeostasis in Estuarine Animals: Adapting to Variable Environments
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AH BiologyEnvironmental Biology Homeostasis and Estuarine Animals
Tidal movements results in: Variable abiotic factors: • Salinity • Temperature • Oxygen • Density
http://vimeo.com/4997994 Organisms can respond to change by:
Osmoconformers • Their blood concentration varies with the environment, ie they passively tolerate changes in salinity • eg jellyfish, squid
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
2. Hyper/Hypo Regulation • At the freshest conc. the organism is hypertonic but as conc. increases it becomes hypotonic. • eg prawn
How do they do it? • Contractile vacuoles • Chloride secretory cells, etc
