title: Effects of nitrate addition and iron speciation on trace element transfer in coastal food webs under phosphate and iron enrichment.
abstract: Coastal organisms are often exposed to both iron enrichment and eutrophication. Trace elements transfer in coastal food webs are critical for marine life and therefore influence coastal ecosystem function and the global carbon cycle. However, how these exposures affect algal element uptake and the subsequent element transfer to marine copepods (Tigriopus japonicus) is unknown. Here we investigated the effects of nitrate addition and iron speciation (Fe (OH)3 or EDTA-Fe) on the biological uptake of Cu, Zn, and Se under phosphate and iron enrichment, using Thalassiosira weissflogii, Skeletonema costatum, and Chlorella vulgaris as model marine algae. Algal element adsorption/absorption generally increased with increasing macronutrient concentrations. Algal element assimilation efficiencies depended on iron speciation and marine algae species. Element assimilation efficiencies of copepods were significantly correlated to the intracellular element concentrations in algal cells. Element uptake and transfer were controlled by eutrophication, iron speciation, and algal species in coastal food webs.
authors: Department of Chemistry and Environmental Science, Zhangzhou Normal University, Zhangzhou 363000, China. lishunxing@fjzs.edu.cn
authors: Shun-Xing
authors: SX
authors: Li
authors: Feng-Jiao
authors: FJ
authors: Liu
authors: Feng-Ying
authors: FY
authors: Zheng
authors: Yue-Gang
authors: YG
authors: Zuo
authors: Xu-Guang
authors: XG
authors: Huang
mesh_terms: D000042:Absorption; D000327:Adsorption; D000818:Animals; D002681:China; D048408:Chlorella vulgaris / Q000378:metabolism; D033342:Copepoda / Q000378:metabolism; D017377:Diatoms / Q000378:metabolism; D020387:Food Chain; D007501:Iron / Q000378:metabolism*; D013058:Mass Spectrometry; D009566:Nitrates / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism*; D013056:Spectrophotometry, Ultraviolet; D014131:Trace Elements / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D009566:Nitrates; D010710:Phosphates; D014131:Trace Elements; D014874:Water Pollutants, Chemical; D007501:Iron