Can you help with the following premises based on the change in the bone structure of the gasterosteus aculeatus species? Please read carefully the fragment below to answer the questions:
Lakes formed 12,000 years ago in Canada due to melting ice. The lakes were colonized by marine species of spiny fish called Gasterosteus aculeatus (three-spine stickleback). The current populations of these lake-dwelling fish show a reduction in their outer body armor when compared to their marine ancestors who have a broader armor. Outer body armor refers to the lateral bony plates that develop in these fish. Please see image below:
Research with these populations shows that the reduction in body armor benefits the rapid growth of these fish. This growth, in turn, translates into a decrease in mortality as predators tend to hunt small fish and an increase in nutritional reserve capacity during winter. These advantages allow the greatest reproductive success of these organisms.
Note: For additional information on what is argued in the previous excerpt, you can access the following link: https://www.nsf.gov/news/news_summ.jsp?cntn_id=112436
- In your words. What is the case study about?
- What role do mutations play in the fragment presented above?
- How is the mechanism of natural selection represented in this situation?
- How does a reduction in body armor represent an adaptation?
- What is your personal opinion based on the case study?
TH E STICKLEBACK FISH: An excellent model for understanding evolution in the wild at many levels Lateral plates develop MOLECULAR r- b k __'°""° ac . , '_ GENETIC LEVEL Three regions of a stickleback chromosome have been linked to the ' . e 1- , . ~ ~ loss of lateral plates, ocean" _ Freshwater ﬁsh don't ' I ' . ' and one lateral plate . develop as many plates '- gene has been ' ' identified. MORPHOLOGICAL 8: DEVELOPMENTAL LEVEL POPU LATION LEVEL Younger ﬁsh without the low form Selection on the forms of ("he gene SUVViVE better No the plate gene varies throughout a stickleback Older ﬁsh with the low form life in fresh waters of the gene survive better
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