Biogeography is the study of the distribution of biological organisms. The scale of analysis ranges from very small micro-topography regimes to continental dimensions. Fundamental concepts in this field of study are the nature of barrier formation and response of species to their patterns of travel and migration; in particular, the presence of rivers, mountain ranges, deserts and other natural boundaries are examples of large scale barriers. Besides such major landform barriers there are soil, topographic and meteorological factors that influence the distribution of each species. In the case of smaller scale regimes that are applicable for some bacteria or limited range plant species, there are often very restricted niches; for example, certain bacteriaextremophiles may be limited to such localized features as small geyser pools, and some rare plants may have a single extant colony defined specialized soils such as serpentine and narrow climatic zone. Inherent in the concept of biogeography are the processes of speciation, extinction, dispersal and migration.
Chile has eight ecoregions that occur entirely or partly within its borders on the mainland and three ecorgions offshore:
CactusLast Updated on 2014-08-20 18:54:05Cactus is a family of plants that are specially adapted to survive arid conditions, most often having leaves reduced to spines, and succulent characteristics. The scientific family name Cactaceae is applied to this group comprising 121 different genera. This plant family is concentrated in the Americas and has a surprisingly broad latitude range in both the Northern and Southern Hemispheres.
A considerable number of cacti species are threatened, chiefly due to habitat loss to agriculture, trampling by illegal human immigration into the southwestern USA, large-scale desert solar power projects, and overcollecting.
The cactus family is generally considered native to the Americas. A notable exception is Mistletoe cactus, Rhipsalis baccifera, which is thought to have spread, fairly recently, from the American tropics to the subtropics and the deserts of the... More »
Whale Sanctuary of El Vizcaíno, MexicoLast Updated on 2014-07-10 15:39:44
The Whale Sanctuary of El Vizcaino (27° 23'-27° 59'N, 114° 30'-114° 55'W) is a World Heritage Site located in Mexico and comprises two lagoons which lie in the central part of the Baja California peninsula, between the Gulf of California and the Pacific Ocean. Forms part of the Municipality of Mulege, Bajo California Sur State. Accessible via the north-south highway. Both lagoons are situated on the west side of the peninsula, Laguna Ojo de Liebre is connected to the Bahia Sebastian Vizcaino, and Laguna San Ignacio lies east of the town of Punta Abrejos, into which Rio San Ignacio flows.
Federal Decree of 6 December 1971, promulgated on 14 January 1972, declared Laguna Ojo de Liebre a marine refuge zone for whales. On 28 March 1980, the Decree was modified to include the lagoons of Manuela and Guerrero Negro. On 11 September 1972, a Decree... More »
African Convention on the Conservation of Nature and Natural ResourcesLast Updated on 2014-07-09 16:51:53
Entry into Force: 16 June 1969
We, the Heads of State and Government of Independent African States,
Fully conscious that soil, water, flora and faunal resources constitute a capital of vital importance to mankind;
Confirming, as we accepted upon declaring our adherence to the Charter of the Organization of African Unity, that we know that it is our duty "to harness the natural and human resources of our continent for the total advancement of our peoples in spheres of human endeavour";
Fully conscious of the ever-growing importance of natural resources from an economic, nutritional, scientific, educational, cultural and aesthetic point of view;
Conscious of the dangers which threaten some of these irreplaceable assets;
Accepting that the utilization of the natural resources must aim at satisfying the needs of man according to the carrying capacity of the... More »
Eastern Carpathian beech forestsLast Updated on 2014-07-08 14:27:50Primeval beech forests of the Carpathians are comprised of ten reserves are in the eastern Carpathian Mountains, five clustered in eastern Slovakia and southwestern Ukraine near the Polish border, and five in southwest Ukraine near the point the mountains pass into Romania. These forests, classified as substantially primeval by the United Nations, are situated between 47°56’12”N to 49°05’10”N and 22°11’23”E to 24°23’35”E.
1908: First Ukrainian forest Natural Reserve established in Stuzhytsia;
1920s: Several Ukrainian beech forests became Protected Areas;
1968: The Carpathian Biosphere Reserve created by Soviet Council decree 568;
1977: The Eastern Carpathian National Park established in Slovakia
1980: Karpatskiy National Park (50,303 ha)... More »
Lake MalawiLast Updated on 2014-07-07 18:09:35Lake Malawi is a lacustrine freshwater body and a national park in the country of Mozambique in east Africa. Located on a peninsula between distant mountains at the southern end of Lake Malawi, this water body with its deep clear waters and varied habitats, is home to over six hundred species of cichlid fish, nearly all endemic. Their importance for the study of evolution by adaptive radiation is comparable with that of the Galapagos Islands finches.
The Lake Malawi World Heritage Site was inscribed in the year 1984 by the United Nations on the World Heritage List under Natural Criteria vii, ix and x. The site is placed in the IUCN Management Category II (National Park). The Biogeographical Province is denoted: Lake Malawi (3.29.14)
The National Park is at the southern end of Lake Malawi (also called Lake Nyasa) on and around the Nankhumba Peninsula. The Park includes the... More »
Drag and drop the content to change the order of featured content. The top nine will be displayed.