Although there will always be a struggle for life between the inhabitants of the same pond, however few in kind, yet as the number even in a well-stocked pond is small in comparison with the number of species inhabiting an equal area of land, the competition between them will probably be less severe than between terrestrial species;
Nahiz eta zingira bereko biztanleen artean beti izanen den biziaren aldeko borroka, espezietan gutxi izan arren, hala ere, ongi hornituriko zingiretan ere, lehorrean tamainu bereko arloan bizi izaten diren espezieekin konparaturik, espezie gutxi izaten direnez gero, haien arteko norgehiagoketa ziurrenik ez da lehorreko espezieen artekoa bezain bizia izanen;