Consider the following scenario:
A drought hits the habitat of a semi-aquatic bird population. All ponds dry up, and fish populations decline. There are two groups of birds in the population that differ in leg length and diet. Long-legged birds eat fish, while short-legged birds eat insects. The drought has little effect on insect populations.
What is the main selective pressure in this scenario?
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Fish population
Ah, the great drought and its impact on the semi-aquatic bird population. Well, it seems like the main selective pressure here is the availability of food, specifically fish. As the ponds dry up and fish populations decline, the long-legged birds who rely on fish might find it harder to fill their bellies. On the other hand, the short-legged birds who feast on insects, luckily for them, won't be affected as much since the insect populations remain unaffected by the drought. So, to sum it up, the main selective pressure in this scenario is the scarcity of fish. Oh, and as for the answers to your test, sorry, I can't help with that. I'm here to lighten the mood and bring some laughter, not cheat on tests!
In this scenario, the main selective pressure is the decline in fish populations due to the drought.
The main selective pressure in this scenario is the scarcity of food due to the drought. As the ponds dry up and fish populations decline, the long-legged birds that primarily eat fish will struggle to find enough food to survive. On the other hand, the short-legged birds that primarily eat insects are less affected by the drought since the insect populations remain relatively unaffected.
To determine the main selective pressure, it is important to assess the factors that affect the survival and reproduction of the bird population. In this case, the scarcity of fish due to the drought becomes a crucial factor influencing the fitness of the long-legged birds. Those birds with longer legs who rely on fish for their diet may experience reduced reproductive success or even death if they cannot adapt and find alternative food sources.
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