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- W2904911289 startingPage "20181724" @default.
- W2904911289 abstract "Ediacaran fossils document the early evolution of complex megascopic life, contemporaneous with geochemical evidence for widespread marine anoxia. These data suggest early animals experienced frequent hypoxia. Research has thus focused on the concentration of molecular oxygen (O 2 ) required by early animals, while also considering the impacts of climate. One model, the Cold Cradle hypothesis, proposed the Ediacaran biota originated in cold, shallow-water environments owing to increased O 2 solubility. First, we demonstrate using principles of gas exchange that temperature does have a critical role in governing the bioavailability of O 2 —but in cooler water the supply of O 2 is actually lower. Second, the fossil record suggests the Ediacara biota initially occur approximately 571 Ma in deep-water facies, before appearing in shelf environments approximately 555 Ma. We propose an ecophysiological underpinning for this pattern. By combining oceanographic data with new respirometry experiments we show that in the shallow mixed layer where seasonal temperatures fluctuate widely, thermal and partial pressure ( p O 2 ) effects are highly synergistic. The result is that temperature change away from species-specific optima impairs tolerance to low p O 2 . We hypothesize that deep and particularly stenothermal (narrow temperature range) environments in the Ediacaran ocean were a physiological refuge from the synergistic effects of temperature and low p O 2 ." @default.
- W2904911289 created "2018-12-22" @default.
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- W2904911289 date "2018-12-12" @default.
- W2904911289 modified "2023-10-01" @default.
- W2904911289 title "Oxygen, temperature and the deep-marine stenothermal cradle of Ediacaran evolution" @default.
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- W2904911289 doi "https://doi.org/10.1098/rspb.2018.1724" @default.
- W2904911289 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6304043" @default.
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