Lotka proposed that natural selection was, at its root, a struggle among organisms for available energy; Lotka's principle states that organisms that survive and prosper are those that capture and use energy more efficiently than its competitors.
Lotka je predložio da je prirodna selekcija bila, u svom korenu, borba među organizama za raspoloživu energiju; Lotkin princip tvrdi da organizmi koji preživljavaju i prosperiraju su oni koji efektivnije zarobljavaju i koriste energiju nego njihova konkurencija.