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Göteborgs universitets publikationer

Supplemental effects of diet mixing on absorption of ingested organic carbon in the marine copepod Acartia tonsa

Författare och institution:
Peter Thor (Institutionen för marin ekologi); M. Koski (-); K. W. Tang (-); S. H. J¢nasd¢ttir (-)
Publicerad i:
Marine Ecology Progress Series, 331 s. 131-138
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
We investigated increased carbon absorption efficiencies (AEs) as a possible cause for positive effects of diet mixing on copepod egg production rates (EPRs) and hatching success (EHS). Female Acartia tonsa were fed 14C/51Cr dual-labelled Dunaliella tertiolecta (Dun), Amphidinium carterae (Amp), Phaeocystis globosa (Pha), and 3 pairwise 1:1 mixes of the 3 diets. AEs, derived from the ratios of labels in algae and copepod faecal pellets, were 44% on Dun, 37% on Amp, and 49% on Pha, but increased significantly to 61% on Dun + Amp. As a result, EPRs remained low in all tested diets except for Dun + Amp, where it was twice that in the individual diets. Linear multiple regression analysis revealed that EPRs were strongly dependent on the ingestion and absorption of the fatty acids 18:3(n-3) and 22:6(n-3) so that the simultaneous ingestion and absorption of 18:3(n-3) from Dun and 22:6(n-3) from Amp enhanced EPR in the Dun + Amp diet. EHS was low with the Dun diet, which was devoid of 20:5(n-3) and 22:6(n-3). Multiple regression analysis showed that EHS depended on 16:1(n-7) and any or all of 22:6(n-3), 20:5(n-3), or 18:5(n-3).
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Biologiska vetenskaper ->
Ekologi ->
Marin ekologi
absorption efficiency, carbon, Copepod, copepods, diet, diet mixing, diet quality, MARINE, MARINE COPEPOD, ORGANIC-CARBON, absorption, Acartia, Acartia Tonsa, ACARTIA-TONSA
Postens nummer:
Posten skapad:
2008-01-11 13:25

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