In the following scenario, what mechanism(s) of evolution appear to be in play? Also from what lake do you think this population may be most closely related to? What may explain how the population in A came to be here? On the Paruna River, Southern Brazil This oxbow lake (a lake formed when a section of a river is cut off) floods when the winter rains occur (call in lake A). At those times animals from the lake and river can mix. Currently it is the dry season (low water levels in the river) and no flooding has occurred for the past five years. In this lake there is a population of leaf-mimic fish. These fish spend most of the day floating on their sides, acting like dead leaves. At this time they show mainly the brown color morph (some fish are yellow, orange, red, likely to match the species of tree that surrounds the body of water). At this time the lake is surrounded by a tree that drops leaves which are brown in color. Color pattern in this fish is genetic. A few miles downriver is another small oxbow lake, it has mostly red colored leaf mimic fish (call this lake B), upstream is oxbow lake C, it has brown and orange colored leaf mimics. The main predator of the fish kingfishers (fish hunting birds that look for movement at the water surface, they dive in to catch a fish).
In the following scenario, what mechanism(s) of evolution appear to be in play? Also from what lake do you think this population may be most closely related to? What may explain how the population in A came to be here? On the Paruna River, Southern Brazil This oxbow lake (a lake formed when a section of a river is cut off) floods when the winter rains occur (call in lake A). At those times animals from the lake and river can mix. Currently it is the dry season (low water levels in the river) and no flooding has occurred for the past five years. In this lake there is a population of leaf-mimic fish. These fish spend most of the day floating on their sides, acting like dead leaves. At this time they show mainly the brown color morph (some fish are yellow, orange, red, likely to match the species of tree that surrounds the body of water). At this time the lake is surrounded by a tree that drops leaves which are brown in color. Color pattern in this fish is genetic. A few miles downriver is another small oxbow lake, it has mostly red colored leaf mimic fish (call this lake B), upstream is oxbow lake C, it has brown and orange colored leaf mimics. The main predator of the fish kingfishers (fish hunting birds that look for movement at the water surface, they dive in to catch a fish).
Chapter17: Processes Of Evolution
Section: Chapter Questions
Problem 14SA: Match the evolutionary concepts. ____gene flow a. can lead to interdependent species ____sexual...
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Transcribed Image Text:In the following scenario, what mechanism(s) of evolution appear to be in play? Also from what lake do you think this
population may be most closely related to? What may explain how the population in A came to be here?
On the Paruna River, Southern Brazil
This oxbow lake (a lake formed when a section of a river is cut off) floods when the winter rains occur (call in lake A). At
those times animals from the lake and river can mix. Currently it is the dry season (low water levels in the river) and no
flooding has occurred for the past five years.
In this lake there is a population of leaf-mimic fish. These fish spend most of the day floating on their sides, acting like
dead leaves. At this time they show mainly the brown color morph (some fish are yellow, orange, red, likely to match
the species of tree that surrounds the body of water). At this time the lake is surrounded by a tree that drops leaves
which are brown in color. Color pattern in this fish is genetic. A few miles downriver is another small oxbow lake, it has
mostly red colored leaf mimic fish (call this lake B), upstream is oxbow lake C, it has brown and orange colored leaf
mimics.
The main predator of the fish kingfishers (fish hunting birds that look for movement at the water surface, they dive in to
catch a fish).
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