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| Titel |
Effect of ocean acidification on early life stages of Atlantic herring (Clupea harengus L.) |
| VerfasserIn |
A. Franke, C. Clemmesen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 12 ; Nr. 8, no. 12 (2011-12-15), S.3697-3707 |
| Datensatznummer |
250006250
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| Publikation (Nr.) |
 copernicus.org/bg-8-3697-2011.pdf |
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| Zusammenfassung |
| Due to atmospheric accumulation of anthropogenic CO2 the partial
pressure of carbon dioxide (pCO2) in surface seawater increases and the
pH decreases. This process known as ocean acidification might have severe
effects on marine organisms and ecosystems. The present study addresses the
effect of ocean acidification on early developmental stages, the most
sensitive stages in life history, of the Atlantic herring (Clupea harengus L.). Eggs of the
Atlantic herring were fertilized and incubated in artificially acidified
seawater (pCO2 1260, 1859, 2626, 2903, 4635 μatm) and a control
treatment (pCO2 480 μatm) until the main hatch of herring larvae
occurred. The development of the embryos was monitored daily and newly
hatched larvae were sampled to analyze their morphometrics, and their
condition by measuring the RNA/DNA ratios. Elevated pCO2 neither
affected the embryogenesis nor the hatch rate. Furthermore the results
showed no linear relationship between pCO2 and total length, dry
weight, yolk sac area and otolith area of the newly hatched larvae. For
pCO2 and RNA/DNA ratio, however, a significant negative linear
relationship was found. The RNA concentration at hatching was reduced at
higher pCO2 levels, which could lead to a decreased protein
biosynthesis. The results indicate that an increased pCO2 can affect
the metabolism of herring embryos negatively. Accordingly, further somatic
growth of the larvae could be reduced. This can have consequences for the
larval fish, since smaller and slow growing individuals have a lower
survival potential due to lower feeding success and increased predation
mortality. The regulatory mechanisms necessary to compensate for effects of
hypercapnia could therefore lead to lower larval survival. Since the
recruitment of fish seems to be determined during the early life stages,
future research on the factors influencing these stages are of great
importance in fisheries science. |
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