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Do large predatory ...
Do large predatory fish track ocean oxygenation?
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- Dahl, Tais W. (author)
- Nordic Center for Earth Evolution
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- Hammarlund, Emma U (author)
- Lund University,Lunds universitet,Stockholms universitet,Institutionen för geologiska vetenskaper,University of Southern Denmark, Denmark; Swedish Museum of Natural History, Sweden,Avdelningen för translationell cancerforskning,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Translational Cancer Research,Department of Laboratory Medicine,Faculty of Medicine
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(creator_code:org_t)
- 2014-11-05
- 2011
- English.
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In: Communicative & Integrative Biology. - : Informa UK Limited. - 1942-0889. ; 4:1, s. 92-94
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Abstract
Subject headings
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- The Devonian appearance of 1-10 meter long armored fish (placoderms) coincides with geochemical evidence recording a transition into fully oxygenated oceans. A comparison of extant fish shows that the large individuals are less tolerant to hypoxia than their smaller cousins. This leads us to hypothesize that Early Paleozoic O2 saturation levels were too low to support >1 meter size marine, predatory fish. According to a simple model, both oxygen uptake and oxygen demand scale positively with size, but the demand exceeds supply for the largest fish with an active, predatory life style. Therefore, the largest individuals may lead us to a lower limit on oceanic O2 concentrations. Our presented model suggests 2-10 meter long predators require >30-50% PAL while smaller fish would survive at <25% PAL. This is consistent with the hypothesis that low atmospheric oxygen pressure acted as an evolutionary barrier for fish to grow much above ~1 meter before the Devonian oxygenation.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Keyword
- vertebrate evolution
- oxygen
- fish metabolism
- Paleozoic
- ocean oxygenation
- Placoderms
- geokemi
- Geochemistry
- Journal Article
Publication and Content Type
- ref (subject category)
- art (subject category)
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