Benítez, S., Lagos, N.A.,
Osores, S., Opitz, T.,
Duarte, C., Navarro, J.M.
and Lardies, M.A.
2018
High pCO2 levels affect
metabolic rate, but not
feeding behavior and fitness,
of farmed giant mussel
Choromytilus chorus.
Aquaculture Environment Interactions 10:
267-278.
NOTE:
Choromytilus chorus is a
giant mussel species
that inhabits subtidal
and intertidal locations
off the coast
of southern Chile.
Annual production
has increased a lot
in recent years,
from 339 tons
of biomass in 2012,
to 2,090 tons in 2014.
SUMMARY:
Under elevated
pCO2 conditions,
C. chorus juveniles
experienced increased
metabolic rates.
Other physiological traits
remained unaffected,
including clearance
and ingestion rates,
ammonia excretion,
adsorption efficiency,
growth rates,
biomass production,
net calcification, and
net dissolution rates.
No juveniles experienced
mortality in any of the
three pCO2 treatments.
"One possible explanation
for this tolerance is that
C. chorus inhabits
a wide range of
environmental conditions
(e.g. estuaries and the
marine environment),
involving variable
carbonate availability
(see Melzner et al., 2013;
Vargas et al., 2017)
and thus has acclimatized
to overcome the
negative effects
of high pCO2
conditions."
DETAILS:
Benítez et al. (2018)
exposed juvenile C. chorus
specimens in a laboratory
setting to three pCO2
treatment conditions
(500, 750 or 1200 µatm)
over a period of 30 days
to evaluate its physiological
response to ocean acidification.
Benítez et al. write that
"similar results
have been reported
in other studies of bivalves
from estuarine
and upwelling zones
(e.g. Duarte et al., 2014;
Lagos et al., 2106;
Lardies et al., 2017)
and also in
other mussel species
that appear resilient
to elevated pCO2
(e.g. Thomsen and
Melzner, 2010;
Mackenzie et al., 2014;
Clements et al., 2018)."
REFERENCES:
Clements, J.C., Hicks, C.,
Tremblay, R. and Comeau, L.A.
2018.
Elevated seawater temperature,
not pCO2, negatively affects
post-spawning adult mussels
Mytilus edulis) under food limitation.
Conservation Physiology 6:
cox078.
Duarte, C., Navarro, J.M.,
Acuña, K., Torres, R.,
Manriquez, P.H.,
Lardies, M.A.,
Vargas, C.A. et al.
2014.
Combined effects of temperature
and ocean acidification
on the juvenile individuals
of the mussel Mytilius chilensis.
Journal of Sea Research 85:
308-314.
Lagos, N.A., Benítez, S.,
Duarte, C., Lardies, M.A.,
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and Vargas, C.A.T.
2016.
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on shell characteristics
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aquaculture in an
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Aquaculture Environment Interactions 8:
357-370.
Lardies, M.A., Benítez, S.,
Osores, S., Vargas, C.A.,
Duarte, C., Lohrmann, K.B.
and Lagos, N.A.
2017.
Physiological and histo-pathological
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Melzner, F., Thomsen, J.,
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Future ocean acidification
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Moderate seawater acidification
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metabolic depression
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Mytilus edulis.
Marine Biology 157:
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Vargas, C.A., Lagos, N.A.,
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Manríquez, P.H., Aguilera, V.M.,
Broitman, B., Widdicombe, S.
and Dupont, S.
2017.
Species-specific responses
to ocean acidification
should account for local
adaptation and adaptive plasticity.
Nature Ecology & Evolution 1:
0084.