Elizabeth Hadly (Stanford) 1: Loss of biodiversity in a human-dominated world
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- Опубликовано: 1 окт 2024
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Loss of biodiversity in a human dominated world (Part 1):
A growing human population is forcing many animals into small, geographically separate populations with limited genetic diversity.
The tiger: A species on the brink (Part 2):
Human activity has greatly reduced historic tiger range. Assisted interbreeding between isolated populations could improve genetic diversity and fitness.
Detailed Description:
In her first talk, Dr. Hadly explains how a growing human population has led to a striking loss of biodiversity worldwide. Today, 51% of land area has been converted to human use and the small areas of land that are protected are becoming increasingly isolated. These shrinking “islands” of protected land support fewer species. Isolated small populations show increased inbreeding and reduced genetic diversity making them more vulnerable to collapse. Climate change is exacerbating this loss of biodiversity by forcing animals to migrate and introducing them to novel species and diseases. Hadly illustrates her talk with stories of both populations under threat as well as those that have successfully rebounded.
Tigers are typically portrayed as powerful predators that dominate their environments, however, their numbers have been dramatically declining for years. Historically, tigers ranged throughout most of Southeast Asia. As the number of humans has grown, tigers have been forced into small, distantly separated populations, or subspecies, reducing genetic diversity within each group. In her second talk, Hadly explains models developed in her lab to study the impact of interbreeding between these separate populations. They showed that increasing gene flow between subspecies, via artificial insemination or assisted migration, would greatly increase genetic diversity and improve the likelihood that tigers will survive.
Speaker Biography:
Elizabeth Hadly is the Paul S. and Billie Achilles Chair of Environmental Science and a professor of biology at Stanford University. She is a Senior Fellow in the Stanford Woods Institute for the Environment, and, in September 2016, Hadly will become the Faculty Director for the Stanford Jasper Ridge Biological Preserve.
Hadly’s lab studies the ecology and evolution of vertebrates. In particular, they are interested in how vertebrates, from amphibians to mammals, have responded to environmental changes over the past 10,000 years. Projects span the globe from North and South America to Asia.
In addition to her research commitments, Hadly is senior associate Vice Provost for undergraduate education. She is also a scientific advisor to California Governor Jerry Brown and an advocate for effective scientific communication. Hadly and University of California, Berkeley paleoecologist Anthony Barnosky together wrote a consensus statement on climate change that Governor Brown has used to inform and influence policy makers nationally and internationally.
Hadly received her BA in Anthropology at the University of Colarado, Boulder, her MS in Quaternary Science at Northern Arizona University, Flagstaff and her PhD in Integrative Biology at the University of California, Berkeley.
Learn more about Liz Hadly here: web.stanford.ed...
Hi Liz it's Ryan great information. I am definitely seeing urbanization take over where I live. Walkable cities are the only answer. I think that changes in lifestyle are too miniscule to make an impact. So as soon as space tourism is available I am going mars or the moon permnitly. We need to treat resources like water and oil with the same price tag as valuable goods gasoline should be 7 dollars. Thank you for taking the time to read this
From farmers,villagers and all humans species must be educated indispensability of biodiversity around the world 🌎 even given something incentive to get attention to learners.🙏🏿🌳🌳🦚🦜🐘🦌🦆
Only 5000 views after half a decade.
Thank you Elizabeth for this inspiring talk. I just found out about CRISPR (late, I know) and I will read more about it soon (especially the risks and ethics), but it sounds like that could be a way to fix the genetic diversity problem right?
And this is yet another video highlighting deforestation and livestock as big causes of species loss, does this also result in ecologists eating much more plant-based? :)
HI, Dr Hadly, thank you very much for sharing your great knowledge! I just would like to point out that there is one important misleading slide in your talk (3:51), when you compare livestocks, pets, humans and "wild ANIMALS". Animals as we all know include much more than mammals and I would say that there are far more biomass of wild animals (including everything other than mammals but also wild mammals), than humans and livestocks and pets.
I think it is important to point out this mistake, because most of people really have an overestimated idea of human importance in the ecological and evolutionary sense, which this comparison (livestock, pets, humans and wild animals) helps to support.
All the best,
This is the true inconvenient truth.