Thingstad T F, Krom M D, Mantoura R F C, Flaten G A F, Groom S, Herut B, Kress N, Law C S, Pasternak A, Pitta P, Psarra S, Rassoulzadegan F, Tanaka T, Tselepides A, Wassmann P, Woodward E M S, Riser C Wexels, Zodiatis G, Zohary T
Department of Biology, University of Bergen, Bergen, Norway.
Science. 2005 Aug 12;309(5737):1068-71. doi: 10.1126/science.1112632.
Phosphate addition to surface waters of the ultraoligotrophic, phosphorus-starved eastern Mediterranean in a Lagrangian experiment caused unexpected ecosystem responses. The system exhibited a decline in chlorophyll and an increase in bacterial production and copepod egg abundance. Although nitrogen and phosphorus colimitation hindered phytoplankton growth, phosphorous may have been transferred through the microbial food web to copepods via two, not mutually exclusive, pathways: (i) bypass of the phytoplankton compartment by phosphorus uptake in heterotrophic bacteria and (ii) tunnelling, whereby phosphate luxury consumption rapidly shifts the stoichiometric composition of copepod prey. Copepods may thus be coupled to lower trophic levels through interactions not usually considered.
在一项拉格朗日实验中，向超贫营养、缺磷的东地中海表层水体添加磷酸盐引发了意想不到的生态系统响应。该系统叶绿素含量下降，细菌产量和桡足类卵丰度增加。尽管氮和磷的共同限制阻碍了浮游植物的生长，但磷可能通过微生物食物网以两种并非相互排斥的途径转移到桡足类：（i）异养细菌通过吸收磷绕过浮游植物区室；（ii）隧道效应，即磷酸盐的奢侈消费迅速改变了桡足类猎物的化学计量组成。因此，桡足类可能通过通常未被考虑的相互作用与较低营养级相联系。
