Lemaire Channel Whale Pump
Lemaire Channel, Antarctic Peninsula (65°S) · Antarctica · polar
About this place
Analyze Megaptera novaeangliae spiral bubble-net acoustics and Savoca et al.'s Southern Ocean iron 'Whale Pump'.
For kids: Discover how giant humpback whales blow spiral bubble nets AND fertilize the ocean like giant sea gardeners!
Lemaire Channel Whale Pump · 360° Habitat Camp
What to look for
- Bubble-net & Whale-Pump channel — Euphausia superba & Fe recycling. Centre the calm fjord channel where spiral bubble nets trap krill
- Twin-peak 'Kodak Gap' walls — Wind-shielded fjord stratification. Scan the 1,000 m glaciated cliffs sheltering Lemaire Channel from gales
- Crabeater-seal ice floes — Lobodon carcinophaga krill sieve. Locate the drift-ice floes used by krill-filtering crabeater seals
Source: Roman & McCarthy (2010), PLoS ONE & Savoca et al. (2021), Nature — Baleen whale iron recycling & the krill paradox.
Ask together: Isn't it surprising that having MORE hungry whales in the ocean actually helps grow MORE krill and fish for everyone?
Field quiz
Kids' question: How do giant whales act like 'ocean gardeners' that help tiny sea plants and krill grow?
- They bring rich nutrients up to sunny surface water so ocean plants bloom!
- They plant seaweed seeds with their tails
- They water coral reefs with buckets
Answer
They bring rich nutrients up to sunny surface water so ocean plants bloom!
Adults' question: What resolved the 20th-century 'Krill Paradox'—why Southern Ocean krill stocks declined rather than boomed after industrial whaling?
- Whale fecal plumes recycled >10,000 t/yr of limiting iron into the euphotic zone, fueling diatom blooms that fed krill
- Whales previously ate all krill predators exclusively
- Ships accidentally removed sea salt
- Krill require whale songs to hatch
Answer
Whale fecal plumes recycled >10,000 t/yr of limiting iron into the euphotic zone, fueling diatom blooms that fed krill
360° photo: eneerhut, CC BY-SA 4.0
See it live: Live check: Southern Ocean Wildlife Station
- By day
- Krill- & squid-foraging Southern Ocean penguins & seabirds Southern Ocean whale recovery directly rebuilds iron-fueled trophic webs supporting subantarctic and Antarctic seabirds.
- By night
- Southern Ocean night swell & nocturnal colony chorus Diel vertical migration brings krill swarms into surface waters at night, shaping penguin and whale dive depths.
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