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Vulnerability of early developmental stages of the endangered species Acipenser sturio to pollution and global warming

Abstract : European sturgeon (Acipenser sturio) is an anadromous fish which has been in sharp decline since the beginning of the 20th century. The last wild population of European sturgeon is settled in the Gironde Garonne Dordogne catchment. Because of global change, temperatures have risen and frequency and severity of hypoxic events have increased in this catchment. In addition, the A. sturio population faces chronic pollutant exposure due to increasing agricultural, industrial and domestic releases. The goal of this work is to examine the sensitivity of A. sturio early developmental stages to temperature variations, oxygen depletion and pollutions in environmentally realistic exposure conditions. Embryo-larvae were exposed to combined temperature conditions, ranged from 12°C to 30°C, and dissolved oxygen, ranged from 30 to 90 % O2 saturation (% O2 sat) and to four natural spawning grounds sediments. Lethal and sub-lethal effects were evaluated using embryonic and larval mortality, hatching success, malformation rate, yolk sac resorption, tissue development, routine metabolic rate (RMR), swimming speed and DNA damage (only for sediment exposure). Embryonic survival peaked at 20°C and no survival was recorded at 30°C. No hatching occurred at 50 % O2 sat or below. Malformation rate appeared to be minimum at 20°C and 90 % O2 sat. Maximum RMR were recorded at 20°C under 90 % O2 sat and at 16°C under 70 % O2 sat. At 20°C, RMR was lower at 70% O2 sat than at 90% O2 sat. Swimming speed peaked at 16°C. A. sturio's temperature optimum was shown to be close to 20°C. Its upper tolerance limit is between 26 and 30°C. Its lower tolerance limit was not reached and is supposed to be below 12°C. Oxygen depletion induce sublethal effects at 70 % and lethal effects at 50 % O2 sat. Strikingly, sediment quality of spawning ground had no effect on embryo-larval survival and hatching success. A significant increase of developmental defects and percentage of apoptotic cells was observed for one of the studied sediment. Current temperature, oxygen and sediment quality conditions in the Gironde basin are globally sustainable for A. sturio but a slight O2 levels decrease would impair European sturgeon maintenance capacity in the basin.
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Conference papers
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https://hal.inrae.fr/hal-02601434
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Submitted on : Saturday, May 16, 2020 - 6:41:16 AM
Last modification on : Wednesday, November 17, 2021 - 12:27:18 PM

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  • HAL Id : hal-02601434, version 1
  • IRSTEA : PUB00044490

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INRAE | IRSTEA | INRA | EPHE | CNRS | INSU | PSL

Citation

Nicolas Delage, Philippe Jatteau, C. Clerandeau, Mireille Ledevin, Hélicia Goubin, et al.. Vulnerability of early developmental stages of the endangered species Acipenser sturio to pollution and global warming. Primo 18, May 2015, Trondheim, Norway. pp.21. ⟨hal-02601434⟩

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