A billion years of temperature variability: a key driver of Earth's long-term habitability

Bergmann, Kristin; Boekelheide, Nicholas; Clarke, Julia W; Cantine, Marjorie; Wilcots, Julia; Anderson, Nancy; Jost, A. B.; Laub, Olivia; Drozd, Juliana; Mackey, Tyler J.; Meyer, Fran; Eyster, Athena

doi:10.1002/essoar.10511918.1

Cited by 2 publications

(4 citation statements)

References 25 publications

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“…(2023)). This is especially true when compared to other times in the Tonian or Cambro‐Ordovician where much hotter tropical temperatures of ~35–45°C have been suggested (Bergmann, Boekelheide, et al., 2022; Goldberg et al., 2021; Hearing et al., 2018).…”

Section: Discussionmentioning

confidence: 90%

“…590-550 Ma period suggest that while the Shuram CIE interval itself may have been associated with substantial warming, the temperatures prior to and during the appearance of the Avalon assemblage were not actually that hot (Bergmann, Osburn, et al, 2022, in agreement with the worldwide occurrences of glaciogenic sedimentological evidence as seen in Hoffman and Li (2009) and Wang et al (2023)). This is especially true when compared to other times in the Tonian or Cambro-Ordovician where much hotter tropical temperatures of ~35-45°C have been suggested (Bergmann, Boekelheide, et al, 2022;Goldberg et al, 2021;Hearing et al, 2018).…”

Section: The Role Of Physiology In the Origination Of Ediacaran Organ...mentioning

confidence: 85%

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Deep‐water first occurrences of Ediacara biota prior to the Shuram carbon isotope excursion in the Wernecke Mountains, Yukon, Canada

Boag,

Busch,

Gooley

et al. 2024

Geobiology

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Ediacara‐type macrofossils appear as early as ~575 Ma in deep‐water facies of the Drook Formation of the Avalon Peninsula, Newfoundland, and the Nadaleen Formation of Yukon and Northwest Territories, Canada. Our ability to assess whether a deep‐water origination of the Ediacara biota is a genuine reflection of evolutionary succession, an artifact of an incomplete stratigraphic record, or a bathymetrically controlled biotope is limited by a lack of geochronological constraints and detailed shelf‐to‐slope transects of Ediacaran continental margins. The Ediacaran Rackla Group of the Wernecke Mountains, NW Canada, represents an ideal shelf‐to‐slope depositional system to understand the spatiotemporal and environmental context of Ediacara‐type organisms' stratigraphic occurrence. New sedimentological and paleontological data presented herein from the Wernecke Mountains establish a stratigraphic framework relating shelfal strata in the Goz/Corn Creek area to lower slope deposits in the Nadaleen River area. We report new discoveries of numerous Aspidella hold‐fast discs, indicative of frondose Ediacara organisms, from deep‐water slope deposits of the Nadaleen Formation stratigraphically below the Shuram carbon isotope excursion (CIE) in the Nadaleen River area. Such fossils are notably absent in coeval shallow‐water strata in the Goz/Corn Creek region despite appropriate facies for potential preservation. The presence of pre‐Shuram CIE Ediacara‐type fossils occurring only in deep‐water facies within a basin that has equivalent well‐preserved shallow‐water facies provides the first stratigraphic paleobiological support for a deep‐water origination of the Ediacara biota. In contrast, new occurrences of Ediacara‐type fossils (including juvenile fronds, Beltanelliformis, Aspidella, annulated tubes, and multiple ichnotaxa) are found above the Shuram CIE in both deep‐ and shallow‐water deposits of the Blueflower Formation. Given existing age constraints on the Shuram CIE, it appears that Ediacaran organisms may have originated in the deeper ocean and lived there for up to ~15 million years before migrating into shelfal environments in the terminal Ediacaran. This indicates unique ecophysiological constraints likely shaped the initial habitat preference and later environmental expansion of the Ediacara biota.

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Section: Discussionmentioning

confidence: 90%

Section: The Role Of Physiology In the Origination Of Ediacaran Organ...mentioning

confidence: 85%

Deep‐water first occurrences of Ediacara biota prior to the Shuram carbon isotope excursion in the Wernecke Mountains, Yukon, Canada

Boag,

Busch,

Gooley

et al. 2024

Geobiology

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“…Temperature also regulates diffusive transport mechanisms and oxygen solubility, however in opposing directions 15, and references therein . From the icehouse climate in the Cryogenian Period (720-635 Ma), global temperatures successively increased to define a greenhouse climate in the Cambrian Period (543-505 Ma), as indicated by oxygen isotope paleothermometry 9,13 (Fig. 1B).…”

Section: Mainmentioning

confidence: 99%

“…Here, we hypothesize that persistent transient periods of fluctutating O2 concentrations led to physiological stress in which HIF-α function was essential for optimal fitness. Changes to oxygen fluctuations patterns in shallow settings hinge on two particular geophysical conditions during the Cambrian Period: the global greenhouse climate 9,13 and the expansion of shallow continental shelf areas 14 . Temperature fundamentally controls the rate of photosynthetic oxygen production, as well as oxygen consumption through heterotrophic respiration rate at the sediment-water interface.…”

Section: Mainmentioning

confidence: 99%

Benthic daily oxygen variability and stress as drivers for animal diversification in the Cambrian

Hammarlund

Bukkuri

Norling

et al. 2023

Preprint

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The delay between the origin of animals in the Neoproterozoic and their Cambrian diversification remains perplexing. Animal diversification mirrors an expansion in marine shelf area, but the mechanisms linking this environmental change to early organismal ecology are unclear. In this study, we used a biogeochemical model to consider oxygen dynamics at the sunlit sediment–water interface over night-day (diel) cycles in the early Cambrian under a greenhouse climate. We found that temperatures dictated the diurnal benthic oxic-anoxic shifts that were physiologically stressful to early animals and this dynamic expanded over nutrient-rich shelf areas as continents were flooded in the Cambrian. We suggest that the combination of a greenhouse climate and continental flooding combined to amplify diurnal benthic redox variability, which promoted the adaptive radiation of animals tolerant to oxygen fluctuations and stress, the Metazoa.

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A billion years of temperature variability: a key driver of Earth's long-term habitability

Cited by 2 publications

References 25 publications

Deep‐water first occurrences of Ediacara biota prior to the Shuram carbon isotope excursion in the Wernecke Mountains, Yukon, Canada

Deep‐water first occurrences of Ediacara biota prior to the Shuram carbon isotope excursion in the Wernecke Mountains, Yukon, Canada

Benthic daily oxygen variability and stress as drivers for animal diversification in the Cambrian

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