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Physics and ecology focus on different domains of nature and have developed under distinct scientific paradigms. Still, both share critical features, such as dealing with systems of irreducible complexity and inherent uncertainty at a fundamental level. Physics has embraced such complexity earlier and has devised robustanalytical approaches todescribe general principles of its systems, a path that ecosystem ecology has tracked, but organism-based ecology has only started to.Here, we outlineapproaches from physics -from classical to quantum mechanics -to address ecological questions that deal with emergent patterns of biodiversity, such as species' distribution, niche, and trait variation, whichare of particular interest tocommunity ecology, biogeography, and macroecology. These approaches can be further extended, which would providethese fields with a rationale common to other scientificfieldswithin and outside ecology.

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The population dynamics of gypsy moths from different habitats of the southern Urals was ana lyzed. Patterns of cyclic changes in the population density were examined. The conjugation of the time series of gypsy moth population dynamics from different habitats at the territory of the southern Urals was assessed. Relationships between the population density and weather conditions were studied. Based on the results, a statistical model of population dynamics in gypsy moth from the southern Urals was developed. The effects of regulatory and modifying factors on the population dynamics were assessed.