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Eco Evo Exam 4(c.22)
Definitions
Term | Definition |
---|---|
Landscape ecology | The field of study that considers the spatial arrangement of habitats at different scales and examines how they influence individuals, populations, communities, and ecosystems. |
Legacy effect | A long-lasting influence of historical processes on the current ecology of an area. |
Local diversity | The number of species in a relatively small area of homogeneous habitat, such as a stream. Also known as Alpha diversity. |
Regional diversity | The number of species in all of the habitats that comprise a large geographic area. Also known as Gamma diversity. |
Beta diversity | The number of species that differ in occurrence between two habitats. |
Regional species pool | The collection of species that occurs within a region. |
Species sorting | The process of sorting species in the regional pool among localities according to their adaptations and interactions. |
Species-area curve | A graphical relationship in which increases in area (A) are associated with increases in the number of species (S). |
Species accumulation curve | A graph of the number of species observed in relation to the number of individuals sampled. |
Stepping stones | Small intervening habitat patches that dispersing organisms can use to move between large favorable habitats. |
Equilibrium theory of island biogeography | A theory stating that the number of species on an island reflects a balance between the colonization of new species and the extinction of existing species. |
Potential evapotranspiration (PET) | The amount of water that could be evaporated from the soil and transpired by plants, given the average temperature and humidity. |
Energy-diversity hypothesis | A hypothesis that sites with higher amounts of energy are able to support more species. |
Continental drift | The movement of landmasses across the surface of Earth. |
Pangaea | The single landmass that existed on Earth about 250 Mya and subsequently split into Laurasia and Gondwana. |
Laurasia | The northern landmass that separated from Pangaea about 150 Mya and subsequently split into North America, Europe, and Asia. |
Gondwana | The southern landmass that separated from Pangaea about 150 Mya and subsequently split into South America, Africa, Antarctica, Australia, and India. |
Nearctic region | The biogeographic region of the Northern Hemisphere that roughly corresponds to North America. |
Palearctic region | The biogeographic region of the Northern Hemisphere that corresponds to Eurasia. |
Neotropical region | The biogeographic region of the Southern Hemisphere that corresponds to South America. |
Afrotropical region | The biuogeographic region of the Southern Hemisphere that corresponds to most of Africa. Also known as Ethiopian region. |
Indomalayan region | The biogeographic region of the Southern Hemisphere that corresponds to India and Southeast Asia. Also known as Oriental region. |
Australasian region | The biogeographic region of the Southern Hemisphere that corresponds to Australia, New Zealand, and New Guinea. |