Information AboutRefugia |
| CATEGORIES ABOUT REFUGIA | |
| ecology | |
| biomes | |
| biogeography | |
| regions of south america | |
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In the most basic biological sense refugia (singular: refugium) refer to locations of isolated or Relict Population s of once widespread animal or plant species. This isolation ( Allopatry ) can be the result of human activities - such as Deforestation , over hunting, etc. - or climatic changes. Present examples of such refuge species may be the Mountain Gorilla , now isolated to specific mountains in central Africa, and the Australian Sea Lion , presently isolated to specific breeding beaches in South Australia due to over hunting. This isolation, in many cases, can be seen as only a temporary state; however, some refugia may be long-standing, thereby having many Endemic Species , not found elsewhere, which survive as Relict Population s. More specifically, however, Jürgen Haffer first proposed the concept of refugia to help explain the Biological Diversity of bird populations in the Amazonian river basin. Haffer forwarded that climatic change in the late Pleistocene led to reduced reservoirs of habitable forests in which populations become allopatric. Over time the various species in these refugia evolved differently from their counterpart species in different refugia. As the Pleistocene came to an end, the more arid conditions gave way to the present humid rainforest environment, reconnecting the refugia. However, the period of isolation was sufficient to cause Speciation events, turning these once unified species into Parapatric Sister Species . This mode of speciation has since been expanded, being used to explain population patterns in other areas of the world, such as by this model is still highly controversial, however. Refugia may also refer to a concentration of human population south of the continental Ice Sheet s during the Ice Age ANIMAL SCIENCE Refugia is the proportion of the population that is not selected by drug treatment. -"In refuge" from drug It provides a pool of suspectible genes. It dilutes resistant genes in the population. Until recently, overlooked as the most important component of drug resistance selection. SEE ALSO
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