Search results
Results from the WOW.Com Content Network
From this model, conclusions are made on the average survival time for a propagule's offspring, the average survival time of a saturated population, and characteristics of successful propagules. In Chapter 5, MacArthur and Wilson examine why species can be excluded from insular environments and how the niche of a species changes after introduction.
Example of an island model consisting of eight islands and two neighbourhood structures: a simple unidirectional ring (black arrows) and a more complex structure (green and black arrows) In the island model, also called the migration model or coarse grained model, evolution takes place in strictly divided subpopulations. These can be organised ...
The equilibrium model of island biogeography describes the number of species on an island as an equilibrium of immigration and extinction. The logistic population model, the Lotka–Volterra model of community ecology, life table matrix modeling, the equilibrium model of island biogeography and variations thereof are the basis for ecological ...
The "island model" [5] is quite artificial and proposes the idea that a population is divided into two geographically, unique subpopulations (islands) with random mating occurring with exchange of individuals occurring when a migrant is drawn randomly from the total population. In a more realistic model, where short-distance dispersal is taken ...
The theory of island biogeography was originally used to study oceanic islands, but those concepts can be extrapolated to other areas of study. Island species dynamics give information about how species move and interact within Island Like Systems (ILS). Rather than an actual island, ILS are primarily defined by their isolation within an ecosystem.
Tristan da Cunha, a group of volcanic islands in the South Atlantic Ocean, is the most isolated inhabited archipelago on the planet, making its 242 residents quite self-sufficent.
A population ecology concept is r/K selection theory, one of the first predictive models in ecology used to explain life-history evolution. The premise behind the r/K selection model is that natural selection pressures change according to population density. For example, when an island is first colonized, density of individuals is low.
Island Population: The marine iguana is an endemic species of the Galapagos Islands, but it evolved from a mainland ancestor of land iguana. Due to geographic isolation gene flow between the two species was limited and differing environments caused the marine iguana to evolve in order to adapt to the island environment.