For general information...
1 ha is one hectare.
Metric unit of area equal to 10,000 square metres (2.47 acres).
Trafalgar Square, London's only metric square, was laid out as one hectare.
Also, a "lentic" habitat is one which is stagnant or very slow moving like a swamp, pond or lake, as opposed to a "lotic" habitat which would be riverine or moving, such as streams, rivers, creeks, etc.
