Concept explainers
To write:
A scenario where a small island may or may not have a huge number of species.
Introduction:
In
Edward O. Wilson and Robert MacArthur proposed ‘The Equilibrium Model of Island Biogeography’ in 1960. It is a comprehensive model that explains uneven distribution on the new island.
According to Edward O. Wilson and Robert MacArthur, the number of species present on an island reflects the balance between the rates of immigration and extinction. The model predicts that island size is directly proportional to the number of species. The number of species increases with an increase in island size. The number of species decreases with decrease in the distance from the source pool.
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Principles of Biology
- What limits species’ ranges?arrow_forwardThe following graph shows a different equilibrium point for two different-sized islands. What would happen if there were 50 species on both islands? Rate of colonization- Small $ S 30 60 Number of species on island Large Rate of extinction- O Both the small and large island would have an increase in species extinction O The small island would have an increase in extinction and the large island would have an increase in colonization O Both the small and large island would have an increase in species colonization O Nothing would happen, species number does not affect extinction nor colonization The small island would have an increase in colonization and the large island would have an increase in extinctionarrow_forwardDo you think that environmental changes are always bad for a species or do you think such changes can actually help certain species?arrow_forward
- Do you think generalist or specialized species would be better able to adapt and avoid extinction if the environment changed rapidly, for example, as a result of forced climate change? Why?arrow_forwardWhat do you mean lay species diversity? Name two measures of species diversity?arrow_forwardWhat would be the best way to make non- biologists aware of the ecological and economic costs of global warming as it affects coral reefs and jelly populations?arrow_forward
- In your region, what species are threatened with extinction? Why are they vulnerable? Suggest steps that could be taken to increase their populations.arrow_forwardHow does protecting the biodiversity of an area increases the survival of a species’ population? Use the principles of threats to biodiversity (e.g. overexploitation, habitat loss, invasive species, etc.), species dominance or evenness, and genetics of the species (e.g. inbreeding, mutations, founder effect bottlenecks, etc.). Use a Philippine endemic species as an example in your answer.arrow_forwardIn what ways do you think species matter and it is important to protect species from extinction, or keep them flourishing? Is there something about species or biodiversity that makes it inherently to-be-valued?arrow_forward
- Why do you think variation of species is important in maintaining the natural biodiversity of organisms? Can you briefly explain why there is species variationarrow_forwardDo you expect that natural selection acting within a species would increase the population size of the species? Do you expect that it would increase the rate at which new species arise, thus increasing the number of species?arrow_forwardEcologists use a rank-abundance curve to display relative species abundance, which is a component of biodiversity. It can also be used to demonstrate species richness and evenness. Figure 1 shows the rank- abundance curve for caddisflies (Order Trichoptera) of two aquatic habitats in northern Portugal (data from L.S.W. Tera). Pollution of streams, on the other hand, reduces the diversity of Trichoptera and several other groups of stream insects, reducing both species richness and species diversity. Interpret why those happened. These rank-abundance curves show that the mountain stream caddisfly community has higher species richness and greater species evenness. 0.1 - Mountain stream 0.01 Greater richness and species evenness 0,001 Coastal ponds 0.0001 20 40 60 80 Abundance rank Figure 1: Rank-abundance curve for caddisflies (Order Trichoptera) of two aquatic habitats in northern Portugal (data from L.S.W. Tera). Proportional abundancearrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College