Limestone is a sedimentary rock whose chief mineral component is calcite (calcium carbonate: CaCO3). Limestone can be formed by precipitation of calcite...
East African montane moorlandsLast Updated on 2015-07-01 19:34:45
The East African montane moorlands is a relatively small alpine ecoregion in eastern Africa. The habitat is virtually treeless since it occupies a zone above the treeline. This ecoregion, classified as an element of the montane grasslands and scrublands biome, has a land area measuring only about 1300 square miles. The ecoregion, lying at the upper zones of ancient volcanoes, exhibits low species richness of higher level faunal organisms, but manifests moderate plant and animal endemism, including support of certain extremophiles. There is particularly high endemism among amphibians and small mammals of the ecoregion. Many of the plant species that occur in the ecoregion have adapted interesting morphological features to allow survival in the extreme cold here.
The upper elevations of the ecoregion have persistent glacial cover. Although some of the ecoregion (e.g. Mount Kilamanjaro)... More »
HerbivoreLast Updated on 2015-06-11 10:34:01A herbivore is an animal that derives energy and nutrients by feeding on plants. Different types of herbivores eat different plant parts. For example, folivores feed on leaves, frugivores feed on fruits, granivores feed on seeds, pollinivores feed on pollen, and nectarivores feed on nectar. Herbivores can vary greatly in size, ranging from the largest terrestrial animals (elephants) and large marine mammals such as manatees and dugongs, to small insects, nematodes, and thrips. Herbivores are primary consumers (they receive their energy by consuming primary producers), so they play an important trophic role in ecological communities and food webs.
Because mature leaves are low in nutrients, and difficult to digest because of their high cellulose content, animals use many different strategies to eat leaves. Animals that feed on grass leaves are generally... More »
ComorosLast Updated on 2015-06-03 13:33:51Comoros is a nation of 730,000 people composed of three islands (Ngazidja or "Grande Comore", Mwali or "Mohéli" and Nzwani or "Anjouan") in the Indian Ocean, at the northern mouth of the Mozambique Channel, about two-thirds of the way between northern Madagascar and northern Mozambique.
Comoros also claims a fourth island Mayotte or "Mahoré" which is under French administration. One of the world's poorest countries, the islands comprising Comoros have inadequate transportation links, a young and rapidly increasing population, and few natural resources. The country is not self-sufficient in food production. Rice, the main staple, accounts for the bulk of imports.
The low educational level of the labor force contributes to a subsistence level of economic activity, high unemployment, and a... More »
Zambezian flooded grasslandsLast Updated on 2015-06-01 15:56:03
WWF Terrestrial Ecoregions Collection
Located within the miombo and mopane woodlands of the Central African Plateau, Zambezian flooded grasslands are an anomaly of productivity and abundance in a landscape characterized by nutrient deficient soil and associated vegetation. Unlike the surrounding woodlands that generally support animals only in rather low densities, the wetlands and floodplains of this ecoregion provide habitats to sizable faunal populations, since food and water are abundant throughout the majority of the year. Large populations of waterbirds gather during the rainy season, and numerous herd animals and carnivores frequent the landscape. However, in a climate of rapid population growth and increasing need for land and natural resources, this fragile ecoregion may face increasing threat. Several conservation measures... More »
Spratly IslandsLast Updated on 2015-06-01 15:45:31The Spratly Islands consist of more than 150 small islands or reefs scattered over a sea area of nearly 360,000 square kilometres in the South China Sea, about two-thirds of the way from southern Vietnam to the southern Philippines. The closest countries to the Spratly Islands are Malaysia, Vietnam, Brunei and the Philippines.
Abundant in marine biodiversity, the Spratly Islands lie in rich fishing grounds and potential gas and oil deposits. (See Energy profile of South China Sea)
These islands are strategically located near several primary strategic shipping lanes in the central South China Sea.
There are no indigenous inhabitants. But there are scattered garrisons occupied by military personnel of several claimant states, notably the Philippines.
They are claimed in their entirety by Taiwan, Vietnam and China, while portions are claimed by Malaysia and... More »
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