Population Dynamics Of Fishes -- See Fish populations Here are entered works on groups of fish, all of the same species, that occupy a particular area. Works on groups of fish populations interacting and living together in a particular environment are entered under Fish communities.
Population Geography -- See Also the narrower term Emigration and immigration Here are entered works on migration across national borders in modern times. Works on the movement of population within the borders of a single country are entered under Migration, Internal. Works on the spread of population, largely in prehistoric times, are entered under Human beings--Migrations. Works on the mass migrations of peoples are entered under Migrations of nations. --subdivision Emigration and immigration under names of countries, cities, etc. for works on migration across national borders from a particular place, and/or migration across national borders to a particular place