Andrew P. Nosal (Scripps/UCSD): Not Just on Vacation: Why Leopard Sharks Hang Out in La Jolla
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- Опубліковано 5 вер 2024
- www.ibiology.o...
Every year from June to December, hundreds to thousands of leopard sharks (Triakis semifasciata) congregate in this one particular spot along the southern California shoreline. Why are they here? Andrew Nosal answers this question and articulates why we should care. He intensely studied these sharks and their behavior over the course of several years. He discovered that most of the sharks are mature pregnant females. During the day, these pregnant females spend most of their time swimming in the warm, calm waters that are unique to the La Jolla area. At night, they forage for squid in a nearby marine canyon. Because sharks lack the ability to regulate their internal temperature (i.e., they are ectothermic), Nosal concludes the pregnant sharks are attracted to La Jolla’s warm waters to support the developing fetuses for the same reason that hens sit on their eggs. He emphasizes the importance of protecting the leopard sharks, especially considering how they carry the next generation of sharks and could easily be wiped out by careless human activity.
Speaker Biography:
Andrew P. Nosal is currently a postdoctoral researcher at Scripps Institution of Oceanography, where he conducts research on the behavior, ecology, and conservation of sharks and rays. Nosal is most interested in the causes and consequences of movement phenomena like aggregation (grouping) behavior, sexual segregation (spatial separation of males and females), and seasonal migration. He works closely with the Birch Aquarium and various media outlets to educate the public about sharks and rays and to dispel myths about these amazing animals. He is passionate about communicating science and, as a PhD student, received two awards for best student oral presentation at international conferences in Minneapolis, MN and Sapporo, Japan. When Nosal is not following sharks and rays, he loves hanging out and traveling with his wife and young daughter.
Really clear and focused presentation! An interesting and necessary project as well. Thanks!
Great video for just about any age group. So many questions - mortality rate of leopard shark pups? Where else in the world are they found? Is the heavy sea lion population taking a toll of the leopard shark count? Why do they migrate north?
Do you have an Instagram account that lets us stay up to date on your findings, studies, travels, etc.?
Great lecture - thanks Andy!
Great lecture -- thank you for so clearly explaining your good work1
Cool work bud, hope you find out where the two (or more) groups travel to.
16:04 that my leopard shark i adopted named spoto
So is this why I can never catch big mature sharks in North San Diego County? Are there any other places in San Diego where this happens, at least to some effect?
Magnificent video
That tiny speck of area where the sharks gather sustain their existence just like our tiny rock in the vast universe sustain us.
Please subtitles ibiolgy.
Espanish
3:50 Interesting -- and telling -- that you are concerned that the sharks are vulnerable to humans, and not vice versa.
He makes this statement because humans kill approximately 100 million sharks each year, WAY more than the small amount of people killed by sharks. So sharks, as most other animals, are certainly more vulnerable to and heavily exploited by humans.
17:24 That's a VERY POOR REASON for not doing science.
you’re a poor reason to not do science