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| Titel |
The effects of intermittent exposure to low-pH and low-oxygen conditions on survival and growth of juvenile red abalone |
| VerfasserIn |
T. W. Kim, J. P. Barry, F. Micheli |
| 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 ; 10, no. 11 ; Nr. 10, no. 11 (2013-11-13), S.7255-7262 |
| Datensatznummer |
250085412
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| Publikation (Nr.) |
 copernicus.org/bg-10-7255-2013.pdf |
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| Zusammenfassung |
| Exposure of nearshore animals to hypoxic, low-pH waters upwelled from below
the continental shelf and advected near the coast may be stressful to marine
organisms and lead to impaired physiological performance. We mimicked
upwelling conditions in the laboratory and tested the effect of fluctuating
exposure to water with low-pH and/or low-oxygen levels on the mortality and
growth of juvenile red abalone (Haliotis rufescens, shell length 5–10 mm).
Mortality rates of juvenile abalone exposed to low-pH (7.5, total scale) and low-O2
(40% saturation, mg L−1) conditions for periods of 3 to 6 h
every 3–5 days over 2 weeks did not differ from those exposed to control
conditions (O2: 100% saturation, 12 mg L−1; pH 8.0). However,
when exposure was extended to 24 h, twice over a 15-day period, juveniles
experienced 5–20% higher mortality in the low-oxygen treatments compared
to control conditions. Growth rates were reduced significantly when
juveniles were exposed to low-oxygen and low-pH treatments. Furthermore,
individual variation of growth rate increased when juveniles were exposed
simultaneously to low-pH and low-O2 conditions. These results indicate
that prolonged exposure to low-oxygen levels is detrimental for the survival
of red abalone, whereas pH is a crucial factor for their growth. However,
the high individual variation in growth rate under low levels of both pH and
oxygen suggests that cryptic phenotypic plasticity may promote resistance to
prolonged upwelling conditions by a portion of the population. |
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