The segregation along the horizontal space dimension of the niche has been investigated in six copepod species occurring together in a brackish water habitat.All but one species show an aggregated pattern which may be described by a negative binomial distribution. The aggregations are small with a radius of 5-15 cm and are distributed randomly in the habitat. Aggregation of different species do not overlap; niche-overlap in this dimension show a somewhat wider utilization of space by the dominant species and insignificant overlap between species; there was no competition for space at the time of the investigation.
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