Global Variation in Bird Clutch Size
Author Information
Author(s): Walter Jetz, Cagan H. Sekercioglu, Katrin Böhning-Gaese
Primary Institution: University of California San Diego
Hypothesis
What factors determine the variation in clutch size among bird species across different environments?
Conclusion
The study found that intrinsic factors like development mode and extrinsic factors like temperature seasonality significantly influence bird clutch size.
Supporting Evidence
- Clutch sizes vary widely, with more than half of all birds laying 2 or 3 eggs.
- Precocial species have larger clutches than altricial species.
- Clutch size increases with temperature seasonality.
Takeaway
Some birds lay more eggs than others, and this study helps us understand why by looking at both the birds' traits and their environments.
Methodology
The study analyzed clutch size data from 5,290 bird species, integrating intrinsic and extrinsic factors in a combined model.
Potential Biases
Potential bias may arise from the exclusion of certain species and reliance on averaged data.
Limitations
The study excluded brood parasites and pelagic species, which may limit the generalizability of the findings.
Participant Demographics
The study included a diverse range of 5,290 landbird species from various geographic regions.
Statistical Information
P-Value
0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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