Why Mountain Passes are Higher in the Tropics
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Tropical species that evolved in comparatively aseasonal environments should have narrower thermal niches, reduced acclimation to temperature fluctuations, and exist at or near their thermal optima.
“As Janzen (3) pointed out, tropical species that evolved in comparatively aseasonal environments should have narrower thermal niches, reduced acclimation to temperature fluctuations, and exist at or near their thermal optima.”
From Climate-driven declines in arthropod abundance restructure a rainforest food web (2018) · cites this paper as [3]
Even small increments in temperature can precipitate sharp decreases in fitness and abundance in tropical species.
“Consequently, even small increments in temperature can precipitate sharp decreases in fitness and abundance.”
From Climate-driven declines in arthropod abundance restructure a rainforest food web (2018) · cites this paper as [3]
Over a 35-y period at La Selva, Costa Rica, Anolis capito, Anolis humilis, and Anolis apletophallus decreased by 23%, 78%, and 71%, respectively.
“Over a 35-y period at La Selva, Costa Rica, Anolis capito, Anolis humilis, and Anolis apletophallus decreased by 23%, 78%, and 71%, respectively (3)”
From Climate-driven declines in arthropod abundance restructure a rainforest food web (2018) · cites this paper as [3]
This hypothesis also provides a parsimonious explanation for why similar cross-taxa, concordant decreases in reptiles, anurans, and birds have occurred in Costa Rican rainforests and are likely occurring across a broad range of tropical ecosystems.
“This hypothesis also provides a parsimonious explanation for why similar cross-taxa, concordant decreases in reptiles, anurans, and birds have occurred in Costa Rican rainforests (3, 63), and are likely occurring across a broad range of tropical ecosystems.”
From Climate-driven declines in arthropod abundance restructure a rainforest food web (2018) · cites this paper as [3]
Limited dispersal across abiotic barriers shapes genetic structure in T. montana.
“supporting limited dispersal across abiotic barriers (Janzen, 1967)”
From Treeshrews (Scandentia): an integrative review of taxonomy, ecology, evolution, and conservation (2026) · cites this paper as Janzen, 1967
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- Authors
- Janzen, D. H.
- Corresponding author
- Janzen, Daniel H.
- ORCID
- Janzen, Daniel H.
- Venue
- The American Naturalist
- Publisher
- University of Chicago Press
- Published
- 1967-05
- Volume
- 101
- Issue
- 919
- Pages
- 233-249
- ISSN
- 0003-0147 (ISSN-L)
- 1537-5323
- OpenAlex
- W2023033196
- Cited by
- 2,056
- References
- 8
- Citations by year
- 2026: 116 · 2025: 149 · 2024: 148 · 2023: 136 · 2022: 136 · 2021: 131 · 2020: 152 · 2019: 156 · 2018: 108 · 2017: 89 · 2016: 99 · 2015: 68 · 2014: 73 · 2013: 73 · 2012: 68
- FWCI
- 4.02
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The American Naturalist (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Geography and Environmental Studies
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological and Geophysical Studies
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Keywords
- mountain pass, tropical mountains, altitude, elevation gradient, species distribution
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