Lack of evidence for elevated CO2-induced bottom-up effects on marine copepods: a dinoflagellate - calanoid prey - predator pair

被引:16
作者
Isari, Stamatina [1 ,2 ]
Zervoudaki, Soultana [1 ]
Peters, Janna [3 ]
Papantoniou, Georgia [4 ]
Pelejero, Carles [2 ,5 ]
Saiz, Enric [2 ]
机构
[1] Hellen Ctr Marine Res, Inst Oceanog, PO 712,46-7 Km Ave Athens Sounio, Athens 19013, Greece
[2] CSIC, Inst Ciencias Mar, Pg Maritim Barceloneta 37-49, Barcelona 08003, Spain
[3] Univ Hamburg, Inst Hydrobiol & Fisheries Sci, Grosse Elbstr 133, D-22767 Hamburg, Germany
[4] Univ Athens, Dept Biol, Athens 15701, Greece
[5] ICREA, Pg Lluis Co 23, Barcelona 08010, Catalonia, Spain
关键词
Acartia grani; bottom-up; copepods; dinoflagellates; food quality; Heterocapsa; ocean acidification; pH; EGG-PRODUCTION RATE; OCEAN ACIDIFICATION; REPRODUCTIVE SUCCESS; FOOD QUALITY; CONCENTRATING MECHANISMS; NUTRIENT LIMITATION; CO2; CONCENTRATION; HATCHING SUCCESS; ACARTIA-TONSA; CARBONIC-ACID;
D O I
10.1093/icesjms/fsv078
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Rising levels of atmospheric CO2 are responsible for a change in the carbonate chemistry of seawater with associated pH drops (acidification) projected to reach 0.4 units from 1950 to 2100. We investigated possible indirect effects of seawater acidification on the feeding, fecundity, and hatching success of the calanoid copepod Acartia grani, mediated by potential CO2-induced changes in the nutritional characteristics of their prey. We used as prey the autotrophic dinoflagellate Heterocapsa sp., cultured at three distinct pH levels (control: 8.17, medium: 7.96, and low: 7.75) by bubbling pure CO2 via a computer automated system. Acartia grani adults collected from a laboratory culture were acclimatized for 3 d at food suspensions of Heterocapsa from each pH treatment (ca. 500 cells ml(-1); 300 iwg C l(-1)). Feeding and egg production rates of the preconditioned females did not differ significantly among the three Heterocapsa diets. Egg hatching success, monitored once per day for the 72 h, did not reveal significant difference among treatments. These results are in agreement with the lack of difference in the cellular stoichiometry (C: N,C: P, and N : P ratios) and fatty acid concentration and composition encountered between the three tested Heterocapsa treatments. Our findings disagree with those of other studies using distinct types of prey, suggesting that this kind of indirect influence of acidification on copepods may be largely associated with inter specific differences among prey items with regard to their sensitivity to elevated CO2 levels.
引用
收藏
页码:650 / 658
页数:9
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