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THE COLOR OF ENVIRONMENTAL NOISE
Author(s) -
Vasseur David A.,
Yodzis Peter
Publication year - 2004
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.1890/02-3122
Subject(s) - white noise , fragility , noise (video) , ecology , range (aeronautics) , environmental noise , temperate climate , latitude , power law , spectral line , environmental science , atmospheric sciences , physics , biology , mathematics , statistics , acoustics , artificial intelligence , computer science , image (mathematics) , sound (geography) , materials science , composite material , astronomy , thermodynamics
Biological populations are strongly influenced by the random variation in their environment. The spectrum of frequencies in noise is particularly important to dynamics and persistence. Here we present an analysis of the variance spectra of a wide variety of long‐term time series of environmental variables. Spectra were well approximated by the inverse power law 1/ f β within the appropriate range of frequencies f ; however, the majority of spectra were “flattened” at low frequencies. With some qualification we found the spectral exponents (β) to corroborate an earlier suggestion that terrestrial noise tends to be “white” (β < 0.5), while marine environments tend to be “red” (β ≈ 1) or “brown” (β ≈ 2). As well, we found a tendency for whiter noise in temperate latitudes than in either high or low latitudes. These results have wide‐ranging consequences for ecosystem fragility and species conservation.