The abyssal ecosystem refers to an ecosystem in the deep parts of an ocean. Here are some examples of animals that you can find in an abyssal ecosystem: http://www.oddee.com/item_79915.aspx. You can also see examples in the documentary Planet Earth or even in the movie Finding Nemo.
An abyssal ecosystem is an ecosystem that exists below the euphotic zone (exposed to sufficient sunlight), where there is insufficient light to catalyze photosynthesis. This zone is extremely dark and relatively cold, except for hydrothermal vent ecosystems. Organic material that is used for sustenance is transported from the upper portion of the water column.
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