Time to turn our focus to the mighty river systems of the Pacific Northwest to examine a mysterious titan of the deep—the white sturgeon! BTW there is only one episode left before the summer break and encore presentations.

The guest for this episode is Dr. Stuart Willis, a fisheries geneticist with the Hagerman Genetics Lab. Together, we trace the evolutionary history of an apex scavenger, map how massive hydroelectric developments alter river ecology, and unpack the realities of polyploid genomics. From culturally vital First Nations fisheries to the modern engineering challenges of conservation aquaculture, we explore what it takes to protect a species that measures its life span in centuries.

Dr. Willis discusses the realities of mapping genomes, explaining how his past voyages into the Amazon prepared him for the ambiguous data limits of tracking prehistoric chromosomes. We confront the problems managing fragile river basins sectioned off by dams, and mapping hazards like river temperature spikes, sediment loss, and invasive species. The result is a look at how genetic tracking tools inform state policy decisions, highlighting the critical ecological reliance Sturgeon have on marine-derived nutrients brought by dwindling salmon runs.

Topics Covered

The Hydroelectric Stroke: How run-of-river dams slow down river current

Ploidy Paradoxes: Demystifying chromosomes from diploidy to octoploidy. Why female sturgeon dictate genetic sex markers

Hopeful Monsters: How extreme environments exploit isolated niches. Nutrient Lifelines: Why freshwater health requires marine salmon runs

Chapters

(00:00) Mysterious Sturgeon of the Fraser

(04:00) STEM Career Paths and Amazon Field Work

(07:50) Two Mighty Rivers: Fraser vs. Columbia

(10:30) Run-of-River Dams and Ecological Strokes

(11:50) Anadromous Lifecycles vs. Catadromous Eels

(13:30) Prehistoric Features and Electroreception Tech

(16:00) Periodic Life History and Delayed Maturity

(20:45) Wrapping Your Head Around Cell Ploidy

(24:00) Autopolyploidization and Evolutionary Magic

(27:50) Rediploidization and Genomes Simplifying Over Time

(32:25) Hopeful Monsters in Isolated Island Niches

(38:15) Tortoiseshell Cats and ZW Sex Determination

(42:00) Hatchery Pentaploids and Spontaneous Mutants

(44:40) Null Alleles & Failed Diagnostic Assays

(47:50) Structural Variation and Conservation Tools

(52:20) Declining Salmon Runs and Marine Nutrients

(56:30) Call Outs, Sequoias of the Deep

Links:

Paper

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Whimsical Wavelengths: Deep-dive conversations where a working scientist unpacks how we know what we know, one paper, one idea, or whimsical detour at a time. Hosted by Dr. Jeffrey Zurek (P.Geo).