HHMI's Holiday Lectures on Science
Episodes
Episodes of HHMI's Holiday Lectures on Science
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"Trophic Cascades in Rivers" by Mary E. Power, PhDThe ecosystem of a river depends on complex interactions between primary producers, grazers, and predators, which in turn are determined both by the traits of the individual species involved an
"Untangling Salt Marsh Food Webs" by Brian R. Silliman, PhDCoastal wetlands are dominated by a variety of plants adapted to a stressful environment. In the absence of a significant number of herbivores, the growth of these plants was thought t
"Floods, Droughts, and Food Chains" by Mary E. Power, PhDMany rivers of the world have vast seasonal changes in flow rates. Dr. Mary Power leads us in an exploration of Northern California’s Eel River and how the community of herbivores and pr
"Climate Stress and Coastal Food Webs" by Brian R. Silliman, PhDMany rivers of the world have vast seasonal changes in flow rates. Dr. Mary Power leads us in an exploration of Northern California’s Eel River and how the community of herbivores
"Ecology, Food Webs, and the Chesapeake Bay" with Sean Carroll, PhD, Beth McGee, PhD, Mary E. Power, PhD, and Brian R. Silliman, PhDA discussion of the Chesapeake Bay Watershed, its complex food web, and the challenges of conserving and restor
"Africa's Savanna Ecosystems" by Robert M. Pringle, PhDSavannas cover 20 percent of Earth’s surface and much of Africa. The patterns and processes that occur in this globally important biome illustrate core concepts in ecology.
"Patterns in Nature" by Corina E. Tarnita, PhDRegular spatial patterns abound in natural systems. Understanding how patterns arise in ecosystems provides insights into how these ecosystems function.
"How Species Coexist" by Robert M. Pringle, PhDLarge herbivores in the African savanna coexist by partitioning ecological niches by time, space, and diet.
"Modeling Populations and Species Interactions" by Corina E. Tarnita, PhDGorongosa National Park in Mozambique provides several examples for how to model the growth of animal populations and then check the models against actual data.
"Communities as Ecological Networks" by Robert M. Pringle, PhD and Corina E. Tarnita, PhDEcosystems include complex interactions between animals and plants, which can be measured experimentally and investigated using mathematical models.
"Conserving and Restoring Ecosystems" by Robert M. Pringle, PhDTwo important questions in ecology are "How do we conserve ecosystems?" and "When we try to restore damaged ecosystems, what state do we restore them to?"
"The Science of Camera Traps" by Alexandra Swanson, PhD and Roland Kays, PhDA discussion of camera traps and their use in ecological research.
"Patterns and Processes in Ecology" with Sean Carroll, PhD, Robert M. Pringle, PhD, Corina E. Tarnita, PhD,Alexandra Swanson, PhD and Roland Kays, PhDThe 2015 Holiday Lecture discussion session.
"Learning from Past Extinctions" by Anthony D. Barnosky PhDThe fossil record contains evidence of five mass extinctions, when more than 75 percent of species went extinct. Mammals are a key group for comparing past and present extinction rates
"Humans, Biodiversity, and Habitat Loss" by Elizabeth A. Hadly PhDHuman activities have caused the extinctions of many species in the past, and that is also happening today. Human population growth is driving habitat destruction and climate ch
"Rescuing Species" by by Elizabeth A. Hadly PhDThe loss of biodiversity also means a loss of genetic diversity, which is the biological toolkit for adaptation. As populations of animals become increasingly isolated due to habitat fragmentation
"Extreme Life of the Sea" by Stephen R. Palumbi PhDOcean biodiversity is also threatened by human activities. But because the ocean is huge and has highly diverse environments, marine organisms appear to be more resilient than land animals whe
"Ocean Species Respond to Climate Change" by Stephen R. Palumbi PhDCoral reefs are threatened by many human activities, including global ocean warming from climate change. Some corals can survive unusually high temperatures by virtue of their
"Dodging Extinction" by Anthony D. Barnosky PhDThe current threats to biodiversity are tightly coupled to human demand for power, food, and money. We can avoid a sixth mass extinction by rethinking how we use energy, how we feed the world, and
"Saving Biodiversity" with Anthony D. Barnosky PhD, Elizabeth A. Hadly PhD, Stephen R. Palumbi PhDA sixty minute discussion on biodiversity with the lecturers and students attending the 2014 Holiday Lectures. Moderated by HHMI vice president o
"Sizing Up the Brain Gene By Gene" by Christopher Walsh, MD PhDThe human brain is a complex network of cells whose organization and function are controlled by many genes. By working with patients who have developmental brain disorders, Dr. Chr
"Cancer As a Genetic Disease" by Charles Sawyers, MDDespite decades of research, cancer continues to be a major cause of death in the United States. The disease is traditionally treated by a combination of surgery, radiation, and chemotherapy,
"Decoding the Autism Puzzle" by Christopher Walsh, MD PhDAutism is a general term for a spectrum of disorders of brain development that range in severity from mild to severe. Because autism is not a single disease, it has been difficult to id
"From Cancer Genomics to Cancer Drugs" by Charles Sawyers, MDBased on early successes with targeted drug therapy, the cancer research community prioritized sequencing the genomes of thousands of tumor samples to identify every gene mutated in
"Dog Genomics and Dogs as Model Organisms" by Elinor Karlsson, PhDDr. Elinor Karlsson of the Broad Institute discusses using dogs in genome-wide association studies (GWAS), and the genetic evidence for dog domestication, as revealed by copy-nu
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