Jordan's rule

Jordan's rule

[′jȯrd·ənz ‚rül]
(evolution)
The rule that organisms which are closely related tend to occupy adjacent rather than identical or distant ranges.
(vertebrate zoology)
The rule that fishes in areas of low temperatures tend to have more vertebrae than those in warmer waters.
References in periodicals archive ?
Israel along with the Palestinian Authority, Arab League, EU and Turkey formally recognize Jordan's rule as custodian of the Holy Sites.
Jordan's rule was that the gun should be fired mostly with .38 Special ammunition and carried with magnums.
According to the water-sharing plan, which took into account Jordan's rule over the West Bank, the kingdom would get a share of 720m cubic meters of water a year, but this amount was calculated to meet the country's needs at a time when Jordan only had half of its current population.
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