BIRDD LAB Week 2

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Dec 6, 2023

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Determining the correlation between average rainfall and selection of beak size in Geospiza fortis. Madeline, Case, Mithuna, Hannah
Background – Broad Rationale How does climate change affect the evolution of certain animals? (Huang 2013)
Background How can rainfall affect the evolution of certain species, like Geospiza fortis ? (Beausoleil, 2019)
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Preliminary Research The beak size in G. Fortis varies between islands that have different amounts of rainfall. Floreana Isabela San Cristobal 15.6 15.8 16 16.2 16.4 16.6 16.8 17 17.2 17.4 17.6 Islands Average Beak Length (mm) Figure 1. Average beak length (mm) of female G. fortis between islands Floreana, Isabella, and San Cristobal, with standard error included
Hypothesis An increase in rainfall on the island Isabela will have an effect on the average beak size of G. Fortis. Grant, P. R., & Boag, P. T. (1980).
Research Question Does the average beak length of G. Fortis increase with an increase in average rainfall at different locations on the island Isabela?
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Hypotheses H 0 : The average beak length of G. fortis is not affected by rainfall on the island Isabela H a : The average beak length of G. fortis is affected by rainfall on the island Isabela (Kleindorfer and Dudaniec, 2020)
Methods We will choose three locations on the Island Isabella, each with low, medium, and high amounts of rainfall.
Resources Beausoleil, M.-O., Frishkoff, L. O., M'Gonigle, L. K., Raeymaekers, J. A., Knutie, S. A., De León, L. F., Huber, S. K., Chaves, J. A., Clayton, D. H., Koop, J. A., Podos, J., Sharpe, D. M., Hendry, A. P., & Barrett, R. D. (2019). Temporally varying disruptive selection in the medium ground finch (Geospiza Fortis). Proceedings of the Royal Society B: Biological Sciences, 286(1916), 20192290–20192290. https://doi.org/10.1098/rspb.2019.2290 Huang, P., Xie, S. P., Hu, K., Huang, G., & Huang, R. (2013). Patterns of the seasonal response of tropical rainfall to global warming. Nature Geoscience , 6 (5), 357-361. Grant, P. R., & Boag, P. T. (1980). Rainfall on the galápagos and the demography of Darwin’s finches. The Auk , 97 (2), 227–244. https://doi.org/10.1093/auk/97.2.227 Kleindorfer, S., & Dudaniec, R. Y. (2020). Hybridization fluctuates with rainfall in Darwin’s tree finches. Biological Journal of the Linnean Society , 130 (1), 79–88. https://doi-org.uc.idm.oclc.org/10.1093/biolinnean/blaa029
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