DOI: 10.1111/gcb.13527
论文题名: Effects of ocean acidification increase embryonic sensitivity to thermal extremes in Atlantic cod, Gadus morhua
作者: Dahlke F.T. ; Leo E. ; Mark F.C. ; Pörtner H.-O. ; Bickmeyer U. ; Frickenhaus S. ; Storch D.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期: 4 起始页码: 1499
结束页码: 1510
语种: 英语
英文关键词: aerobic metabolism
; Atlantic cod
; embryonic development
; hatching success
; mitochondrial respiration
; ocean acidification
; ocean warming
; thermal tolerance window
Scopus关键词: Gadus morhua
英文摘要: Thermal tolerance windows serve as a powerful tool for estimating the vulnerability of marine species and their life stages to increasing temperature means and extremes. However, it remains uncertain to which extent additional drivers, such as ocean acidification, modify organismal responses to temperature. This study investigated the effects of CO2-driven ocean acidification on embryonic thermal sensitivity and performance in Atlantic cod, Gadus morhua, from the Kattegat. Fertilized eggs were exposed to factorial combinations of two PCO2 conditions (400 μatm vs. 1100 μatm) and five temperature treatments (0, 3, 6, 9 and 12 °C), which allow identifying both lower and upper thermal tolerance thresholds. We quantified hatching success, oxygen consumption (MO2) and mitochondrial functioning of embryos as well as larval morphometrics at hatch and the abundance of acid–base-relevant ionocytes on the yolk sac epithelium of newly hatched larvae. Hatching success was high under ambient spawning conditions (3–6 °C), but decreased towards both cold and warm temperature extremes. Elevated PCO2 caused a significant decrease in hatching success, particularly at cold (3 and 0 °C) and warm (12 °C) temperatures. Warming imposed limitations to MO2 and mitochondrial capacities. Elevated PCO2 stimulated MO2 at cold and intermediate temperatures, but exacerbated warming-induced constraints on MO2, indicating a synergistic interaction with temperature. Mitochondrial functioning was not affected by PCO2. Increased MO2 in response to elevated PCO2 was paralleled by reduced larval size at hatch. Finally, ionocyte abundance decreased with increasing temperature, but did not differ between PCO2 treatments. Our results demonstrate increased thermal sensitivity of cod embryos under future PCO2 conditions and suggest that acclimation to elevated PCO2 requires reallocation of limited resources at the expense of embryonic growth. We conclude that ocean acidification constrains the thermal performance window of embryos, which has important implication for the susceptibility of cod to projected climate change. © 2016 John Wiley & Sons Ltd 资助项目: Dahlke, F.T.
; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, Germany
; 电子邮件: flemming.dahlke@awi.de
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60989
Appears in Collections: 影响、适应和脆弱性
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作者单位: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, Bremerhaven, Germany; University of Bremen, NW 2 Loebener Str., Bremen, Germany; Hochschule Bremerhaven, An der Karlstadt 8, Bremerhaven, Germany
Recommended Citation:
Dahlke F.T.,Leo E.,Mark F.C.,et al. Effects of ocean acidification increase embryonic sensitivity to thermal extremes in Atlantic cod, Gadus morhua[J]. Global Change Biology,2017-01-01,23(4)