Human Disturbance Influences Reproductive Success and Growth Rate in California Sea Lions
Author Information
Author(s): French Susannah S., González-Suárez Manuela, Young Julie K., Durham Susan, Gerber Leah R.
Primary Institution: Utah State University
Hypothesis
How does human activity affect the reproductive rate and growth of California sea lions?
Conclusion
Increased human presence is linked to lower reproductive rates in California sea lions, which could lead to population declines.
Supporting Evidence
- Increased human presence was associated with lower reproductive rates.
- Higher body growth rates in pups were observed with increased exposure to humans.
- Human disturbance is a significant factor affecting the reproductive success of California sea lions.
Takeaway
When people are around, California sea lions have fewer babies, but the babies that are born grow faster because there are fewer of them competing for food.
Methodology
Data was collected from six breeding colonies of California sea lions in the Gulf of California, measuring reproductive rates, pup body condition, and growth rates in relation to human exposure.
Potential Biases
Potential biases in demographic counts due to the difficulty of observing all pups and females.
Limitations
The study did not account for individual-level responses of pups to human activity due to measurement scale mismatches.
Participant Demographics
California sea lions from six different islands in the Gulf of California.
Statistical Information
P-Value
0.053
Statistical Significance
p=0.053
Digital Object Identifier (DOI)
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