Fen

A fen is a sere, a phase in the natural ecological succession from the open water of a lake to (for example) woodland. It is thus, a type of wetland.

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The ecological succession begins with fresh water filling a depression in the land surface. However, the subsequent course of development depends on the conditions; the acidity of the water, the climate and so on. In a north European climate, given a near-neutral or somewhat basic pH, submerged plants will colonize the lake while from its margin, emergent vegetation, typically a reed bed will spread.

Sere: SERE (Survival, Evasion, Resistance and Escape) is a US military program developed at the end of the Korean War which provides service members with training in survival, evading capture and dealing with a prisoner-of-war environment. The school is intended to train aircrews, special forces and other...

Ecological succession: Ecological succession, a fundamental concept in ecology, is the process by which a natural community moves from a simpler level of organisation to a more complex community. Succession is a natural process that occurs after some form or disturbance which simplifies the system. Ecological succession...

Lake: A lake is a body of water surrounded by land. The majority of lakes are fresh water, and most lie in the northern hemisphere at higher latitudes. Large lakes are sometimes referred to as "inland seas" and small seas are sometimes referred to as lakes....