Influence of N, P additions on the transfer of nickel from phytoplankton to copepods.
We examined the influence of macronutrient (nitrate and phosphate) additions on Ni uptake by phytoplankton (Prorocentrum donghaiense and Skeletonema costatum) and its subsequent transfer to marine copepods (Calanus sinicus and Labidocera euchaeta). Ni uptake by phytoplankton after 24h of exposure was markedly dependent on nutrient conditions, with a higher nutrient quota facilitating Ni accumulation in the algae. Trophic transfer was quantified by measurements of the Ni assimilation efficiency in C. sinicus and L. euchaeta, feeding on the algae under different nutrient treatments. Ni assimilation efficiency generally increased with an increase of nutrient concentration in the algae. A significant positive-correlation was found between the Ni assimilation efficiencies of the copepods and the %intracellular Ni in the algal cells. However, ambient nutritional conditions had little effect on the physiological turnover rate constant of Ni by copepods. Thus, nutrient enrichment may lead to an increase in Ni uptake and transfer in marine plankton.
Wang
Ming-hua
MH
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, People's Republic of China.
Wang
Da-zhi
DZ
Wang
Gui-zhong
GZ
Huang
Xu-guang
XG
Hong
Hua-sheng
HS
D000818:Animals; D033342:Copepoda / Q000378:metabolism*; D003470:Culture Media; D004435:Eating / Q000502:physiology; D005068:Eutrophication / Q000502:physiology; D009532:Nickel / Q000493:pharmacokinetics*; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism*; D010758:Phosphorus / Q000032:analysis / Q000378:metabolism*; D010839:Phytoplankton / Q000378:metabolism*; D012623:Seawater / Q000737:chemistry; D013997:Time Factors
D003470:Culture Media; D010758:Phosphorus; D009532:Nickel; D009584:Nitrogen