Biology, 21.03.2020 11:10 safiyyahrahman8937
In the southeastern United States, marshes are dominated by two species of smooth cordgrass; Spartina alterniflora dominates the seaward edge of the marsh, while Spartina patens dominates the high marsh. You work with researchers and determine that if S. patensis is removed from the high marsh, S. alterniflora will occupy all of the marsh, into the high marsh. If, however, S. alterniflora is removed from the seaward side of the marsh, S. patens will only grow a small portion further seaward, and it does not seem to tolerate being submerged for long periods during high tide. Which of the following is a conclusion you can draw based on this experiment?
1- S. alterniflora is prevented from colonizing the high marsh under normal growing conditions due to predation, resulting in a more seaward realized niche.
2- When S. alterniflora is removed, S. patens can grow in all areas of its fundamental niche, indicating that its distribution is limited by competition to a smaller realized niche.
3- The fundamental niche of S. alterniflora is expanded by its mutualistic relationship with S. patens.
4- When S. patensis is removed, S. alterniflora can grow in all areas of its fundamental niche, indicating that its distribution is limited by competition to a smaller realized niche.
5- The experiment indicates that S. alterflora is a superior competitor and that is why it is found on the seaward side of marshes.
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