The numerous explanations for why Earth's biodiversity is concentrated at low latitudes fail to explain variation in the strength and even direction of the gradient through deep time. Consequently, we do not know if today's gradient is representative of what might be expected on other planets or is merely an idiosyncrasy of Earth's history. We propose a hierarchy of factors driving the latitudinal distribution of diversity: (i) over geologically long time spans, diversity is largely predicted by climate; (ii) when climatic gradients are shallow, diversity tracks habitat area; and (iii) historical contingencies linked to niche conservatism have geologically short-term, transient influence at most. Thus, latitudinal diversity gradients, although variable in strength and direction, are largely predictable on our planet and possibly others.
The hierarchy of factors predicting the latitudinal diversity gradient.
Published 2022 in Trends in Ecology & Evolution
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- Publication year
2022
- Venue
Trends in Ecology & Evolution
- Publication date
2022-09-01
- Fields of study
Medicine, Environmental Science
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- Source metadata
Semantic Scholar, PubMed
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