ooo H20 2:34 PM blackboard.bsu.edu In his experiments on competition between fou
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ooo H20 2:34 PM blackboard.bsu.edu In his experiments on competition between four beetle species confusum and castaneum, Park (1954) found that one species usually out-competed the other species to extinction, but that the outcome depended upon physical conditions (temperature a humidity). What do the results of Park's experiments suggest about how species might co-exist in natural environments, in spite of competition? Researchers have characterized the niches of Galapagos finches by beak size (which determines the size of seeds that can be eaten) and how this allows for competing species to co- exist. Explain how a similar comparison of niches for red fox. coyote, and wolf (al predators that make their living in the same manner) might explain how these species are able to co-exist in North America.Explanation / Answer
In Galapagos archipelago there are more than 19 islands and all of them are well separted from one another by the ocean water. Hence, the ancestral population on each island was sufficiently isolated from other such populations. The ancestors of finches, reaching there, fitted into the different islands.
The islands differ from each other in many features of the environment and in the food plants available. so the islands were provided witha variety of ecological niches.
As a result, each island population developed it own adaptation in its particular island condition. These adaptations included genetical changes, morphological changes and behavioural changes. As these adaptations were different from one island to other, the different populations did not interbreed when they came into contact with each other. When there was no interbreeding each population would be considered as a separate species. This is how the different species of the islands originated.
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