Answer
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Hint: The organisms that are fixed into either saltwater or freshwater habitats. They cannot tolerate the rapid changes in salinity that occur during each tidal cycle in an estuary. Examples include Goldfish and many other marine fishes.
Complete answer:
The organisms that can tolerate the only slight change in salinity and not widely are characterized to be under the category of Stenohaline organisms. These organisms usually live in either freshwater or saltwater environments. They fall into the category of osmoregulators.
Additional Information:
Note: Osmoconformers:
Osmoconformers change their liquid substance osmolarity to match the concentration of the medium. Most of the marine invertebrates are osmoconformers.
Osmoregulators:
Osmoregulators maintain the osmolarity of body fluids despite changes within the medium. Osmoregulators survive better in brackish water. However, most of the freshwater species are osmoregulators.
Complete answer:
The organisms that can tolerate the only slight change in salinity and not widely are characterized to be under the category of Stenohaline organisms. These organisms usually live in either freshwater or saltwater environments. They fall into the category of osmoregulators.
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Additional Information:
Euryhaline | Stenohaline |
The ability of an aquatic organism to adapt to a wide range of salinities. | The ability of an aquatic organism to adapt to a narrow range of salinities. |
Can survive either in freshwater, saltwater or brackish water. | Can live in either freshwater or saltwater. |
Can live in regularly changing salinities. | Freshwater organisms are unable to survive in salt water and vice versa. |
Mainly osmoconformers. | Osmoregulators. |
Mostly marine. | Can be either marine or freshwater organisms. |
Examples include Molly, the green crab, salmon, eels, herring etc. | Examples include Goldfish, haddock etc. |
Note: Osmoconformers:
Osmoconformers change their liquid substance osmolarity to match the concentration of the medium. Most of the marine invertebrates are osmoconformers.
Osmoregulators:
Osmoregulators maintain the osmolarity of body fluids despite changes within the medium. Osmoregulators survive better in brackish water. However, most of the freshwater species are osmoregulators.
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