 |
| Titel |
European sea bass, Dicentrarchus labrax, in a changing ocean |
| VerfasserIn |
E. C. Pope, R. P. Ellis, M. Scolamacchia, J. W. S. Scolding, A. Keay, P. Chingombe, R. J. Shields, R. Wilcox, D. C. Speirs, R. W. Wilson, C. Lewis, K. J. Flynn |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 9 ; Nr. 11, no. 9 (2014-05-12), S.2519-2530 |
| Datensatznummer |
250117397
|
| Publikation (Nr.) |
 copernicus.org/bg-11-2519-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Ocean acidification, caused by rising concentrations of carbon dioxide
(CO2), is widely considered to be a major global threat to marine
ecosystems. To investigate the potential effects of ocean acidification on
the early life stages of a commercially important fish species, European sea
bass (Dicentrarchus labrax), 12 000 larvae were incubated
from hatch through metamorphosis under a matrix of two temperatures (17 and
19 °C) and two seawater pCO2 levels (ambient and
1,000 μatm) and sampled regularly for 42 days. Calculated daily
mortality was significantly affected by both temperature and pCO2,
with both increased temperature and elevated pCO2 associated with
lower daily mortality and a significant interaction between these two
factors. There was no significant pCO2 effect noted on larval
morphology during this period but larvae raised at 19 °C possessed
significantly larger eyes and lower carbon:nitrogen ratios at the end of the
study compared to those raised under 17 °C. Similarly, when the
incubation was continued to post-metamorphic (juvenile) animals (day 67–69),
fish raised under a combination of 19 °C and 1000 μatm
pCO2 were significantly heavier. However, juvenile D. labrax
raised under this combination of 19 °C and 1000 μatm
pCO2 also exhibited lower aerobic scopes than those incubated at
19 °C and ambient pCO2. Most studies investigating the
effects of near-future oceanic conditions on the early life stages of marine
fish have used incubations of relatively short durations and suggested that these
animals are resilient to ocean acidification. Whilst the increased survival
and growth observed in this study supports this view, we conclude that more work
is required to investigate whether the differences in juvenile physiology
observed in this study manifest as negative impacts in adult fish. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|