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Answer :
Final answer:
The intertidal sea star Pisaster ochraceus and the banded tetra are both keystone species, crucial for maintaining ecosystem structure and biodiversity in their respective habitats.
Explanation:
A keystone species is critical for maintaining the structure and biodiversity of an ecosystem. In the provided information, the intertidal sea star, Pisaster ochraceus, is cited as a keystone species in the northwestern United States due to its role in controlling mussel populations. Without the sea star, mussel numbers increase, resulting in a decrease in algae and a significant shift in the overall species composition, thereby reducing biodiversity. Another example of a keystone species is the banded tetra, which plays a pivotal role in tropical streams by supplying almost all of the necessary phosphorus to the ecosystem. The loss of banded tetras would greatly affect the aquatic community structure and biodiversity.
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