explain adaptive radiations
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Adaptive radiation is when members of a single group or lineage evolutionarily diverge into a variety of different forms. These forms are dictated by selection pressures and the use of habitats or resources.
What Is Adaptive Radiation?
Look around you. How many different types of life can you see, just sitting at your desk? If you factor in all the bacteria, viruses, insects, plants, and animals, you probably can see a huge number of species without even turning your head. But how did all these species get here? Why do we see organisms evolving the way we do? One of the reasons organisms are the way they are has to do with adaptive radiation.
Adaptive radiation is the evolutionary divergence of members of a single lineage into a variety of different adaptive forms. Usually the adaptive forms differ in their use of resources or habitats, and this divergence happens in a relatively short interval of geological time. In short, it's the tendency of a group of animals to evolve in response to selective pressures and adapt to their environments in different ways.
What Is Adaptive Radiation?
Look around you. How many different types of life can you see, just sitting at your desk? If you factor in all the bacteria, viruses, insects, plants, and animals, you probably can see a huge number of species without even turning your head. But how did all these species get here? Why do we see organisms evolving the way we do? One of the reasons organisms are the way they are has to do with adaptive radiation.
Adaptive radiation is the evolutionary divergence of members of a single lineage into a variety of different adaptive forms. Usually the adaptive forms differ in their use of resources or habitats, and this divergence happens in a relatively short interval of geological time. In short, it's the tendency of a group of animals to evolve in response to selective pressures and adapt to their environments in different ways.
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Hi,hope this helps you...
Adaptive radiation describes the rapid evolutionary diversification of a single ancestral line
It occurs when members of a single species occupy a variety of distinct niches with different environmental conditions
Consequently, members evolve different morphological features (adaptations) in response to the different selection pressures
An example of adaptive radiation can be seen in the variety of beak types seen in the finches of the Galapagos Islands
These finches have specialised beak shapes depending on their primary source of nutrition (e.g. seeds, insects, nuts, nectar)
Adaptive Radiation (Darwin’s Finches)
Daphne Major
Daphne Major is a volcanic island that forms part of the archipelago that is collectively referred to as the Galapagos Islands
It is the native habitat of a variety of bird species known as Darwin’s finches (subfamily: Geospizinae)
Darwin’s finches demonstrate adaptive radiation and show marked variation in beak size and shape according to diet
Finches that feed on seeds possess compact, powerful beaks – with larger beaks better equipped to crack larger seed cases
In 1977, an extended drought changed the frequency of larger beak sizes within the population by natural selection
Dry conditions result in plants producing larger seeds with tougher seed casings
Between 1976 and 1978 there was a change in average beak depth within the finch population
Finches with larger beaks were better equipped to feed on the seeds and thus produced more offspring with larger beaks
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