cover of episode Lab Notes: More than whale food — krill are climate heroes

Lab Notes: More than whale food — krill are climate heroes

2025/1/28
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@Belinda Smith : 我主持了本期节目,主要关注南极磷虾对碳循环和气候变化的影响。我们采访了@Abby Smith 博士,了解了磷虾的生物学特性、数量、在食物链中的作用以及它们对碳循环的贡献。通过对磷虾排泄物中碳含量的研究,我们了解到磷虾在碳封存中扮演着重要的角色,其贡献可能比我们之前预想的还要大。同时,我们也讨论了气候变化对磷虾种群的影响,以及未来研究方向。 Abby Smith: 我是澳大利亚南极洲司的海洋研究员,主要研究南极磷虾。南极磷虾(Euphausia superba)是地球上生物量最大的物种之一,对南大洋的生态系统至关重要。它们以浮游植物为食,通过排泄物将大量的碳从表层水体运输到深海,从而实现碳封存。我们的研究首次揭示了南极磷虾在冬季海冰下的行为,发现它们的垂直迁移具有季节性差异,这可能会影响对磷虾碳封存量估算的准确性。夏季,磷虾主要在上层水域觅食,冬季则靠近海底,这导致冬季碳运输效率降低。我们的研究结果表明,之前对磷虾碳封存量的估算可能高估了实际值,因为之前的模型没有考虑到磷虾垂直迁移的季节性变化。气候变化,特别是海水变暖和海洋酸化,可能会对磷虾的生存和繁殖产生负面影响,这需要我们进一步关注。 Belinda Smith: 本期节目中,我们深入探讨了南极磷虾在海洋生态系统和全球碳循环中的作用,以及气候变化对其的影响。Abby Smith博士的研究为我们提供了宝贵的数据和见解,帮助我们更准确地评估磷虾对碳封存的贡献,并为未来的气候变化研究提供了新的方向。

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This chapter introduces Antarctic krill (Euphausia superba), highlighting their importance in the marine food web and their significant role in carbon sequestration. It emphasizes the surprising contribution of marine life to carbon cycling, contrasting it with the more commonly known carbon capture by forests.
  • Antarctic krill are a crucial part of the marine food web, serving as a primary food source for whales, seals, and penguins.
  • Krill play a significant role in global carbon cycles by consuming phytoplankton and producing carbon-rich fecal pellets that sink to the ocean floor.
  • The ocean's contribution to oxygen production is often underestimated, with phytoplankton responsible for approximately 50% of global oxygen production.

Shownotes Transcript

Antarctic krill (Euphausia superba) do much more than fill whales' bellies. These tiny crustaceans also play a huge role in Earth's carbon cycle.

They sequester around 40 million tonnes of carbon each year, mostly in their poo — that's the equivalent of taking 35 million cars off the road.

Yet there's plenty we don't know about these thumb-sized critters.

Now a new study has revealed what they get up to under the Antarctic winter sea ice, and how this behaviour affects carbon calculations.

Dive into the secret life of krill on Lab Notes, the show that brings you the science of new discoveries and current events.Get in touch with us: labnotes@abc.net.au