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Metacommunity ecology

An ocean tide refers to the cyclic rise and fall of seawater. Tides are caused by slight variations in gravitational attraction between the Earth, the moon and the sun in geometric relationship with locations on the Earth’s surface. Tides are periodic primarily because of the cyclical influence of the Earth’s rotation.

Marine ecosystem services refer to benefits that people obtain from marine ecosystems, including the open ocean, coastal seas, and estuaries. More than one third of the world’s population lives in coastal areas (Table 1), and people throughout the world depend intimately on the oceans and coasts

Sometimes plant names are just plain confusing. The desert willow is not a true willow, but it does grow in deserts. Actually, desert willow is in the trumpet creeper family (Bignoniaceae), which has many showy-flowered species found mostly in the tropics.

Viral hemorrhagic fevers (VHFs) refer to a group of illnesses that are caused by several distinct families of viruses. In general, the term “viral hemorrhagic fever” is used to describe a severe multisystem syndrome (multisystem in that multiple organ systems in the body are affected).

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The Horn of Africa has been a renowned source of biological resources for thousands of years. The ancient Egyptians, Greeks and Romans sent expeditions and caravans to the region for frankincense, myrrh and other natural commodities to be taken back North along the incense route through the Arabian deserts.

Erosion is defined as the removal of soil, sediment, regolith, and rock fragments from the landscape. Most landscapes show obvious evidence of erosion. Erosion is responsible for the creation of hills and valleys. It removes sediments from areas that were once glaciated,