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1. Lawson, Adam Matthew. Latitudinal Gradients in Climatic Niche Evolution.

Degree: 2014, University of Toronto

Either tropical niche divergence or tropical niche conservatism could drive the latitudinal diversity gradient. Greater niche divergence in the tropics could accelerate reproductive isolation leading to more rapid species formation. Alternatively, latitudinal asymmetry in niche conservatism, whereby tropical species are more conserved than high latitude species, could promote more dispersal in to than out of the tropics, leading to greater tropical richness. Here I test whether rates of climatic niche evolution vary across the latitudinal gradient for 164 closely related pairs of species. Using the evolutionary ages at which sister species diverge, and the niche divergence between them, I applied Brownian motion models to test whether rates of climatic niche evolution varied with latitude. My results indicate that climatic niche conservatism is strongest in the tropics. This suggests that the latitudinal diversity gradient is driven by the inability of tropical to adapt to temperate climates and colonize non-tropical latitudes.

MAST

Advisors/Committee Members: Weir, Jason, Ecology and Evolutionary Biology.

Subjects/Keywords: climatic niche; latitudinal gradients; species richness; New Wolrd birds; New World mammals; evolutionary rates; 0329

…niche conservatism, and the latitudinal diversity gradient of New World birds. Journal of… …on the exchange, diversification, and distribution of New World Birds. Ecography. 33, 333… …For example, birds adapting to different habitat types sing at different pitches (Weir… …gradient for closely related pairs of New World bird and mammal species. I quantify climatic… …Published molecular phylogenies were used to obtain 111 avian, and 53 mammalian New World sister… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lawson, A. M. (2014). Latitudinal Gradients in Climatic Niche Evolution. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/44035

Chicago Manual of Style (16th Edition):

Lawson, Adam Matthew. “Latitudinal Gradients in Climatic Niche Evolution.” 2014. Masters Thesis, University of Toronto. Accessed January 21, 2020. http://hdl.handle.net/1807/44035.

MLA Handbook (7th Edition):

Lawson, Adam Matthew. “Latitudinal Gradients in Climatic Niche Evolution.” 2014. Web. 21 Jan 2020.

Vancouver:

Lawson AM. Latitudinal Gradients in Climatic Niche Evolution. [Internet] [Masters thesis]. University of Toronto; 2014. [cited 2020 Jan 21]. Available from: http://hdl.handle.net/1807/44035.

Council of Science Editors:

Lawson AM. Latitudinal Gradients in Climatic Niche Evolution. [Masters Thesis]. University of Toronto; 2014. Available from: http://hdl.handle.net/1807/44035

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