A mass of ice found floating in the ocean or a lake.Often icebergs form when ice calves from land-based glaciers into the water body.Form in cracks that develop in the soil during winter because of thermal contraction.
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Some of these species are beneficial, whereas others can take over and eliminate many native species.
Compare with indicator species, keystone species, and native species.
Mutual or reciprocal influence between two or more similar organisms or individuals of different species.
Major biotic interactions are: competition, mutualism, predation, parasitism, amensalism, and commensialism.
The freezing process causes the water to expand in volume increasing the size and depth of the crack.