Pedrós-Alió C, Calderón-Paz JI, MacLean MH, Medina G, Marrasé C, Gasol JM, Guixa-Boixereu N
Departament de Biologia Marina i Oceanografia, Institut de Ciències del Mar, CSIC, Passeig Joan de Borbó s/n, 08039, Barcelona, Spain
FEMS Microbiol Ecol. 2000 Apr 1;32(2):143-155. doi: 10.1111/j.1574-6941.2000.tb00708.x.
The microbial food web was studied along a gradient of salinity in two solar salterns used for the commercial production of salt. The different ponds in the salterns provide a wide range of ecosystems with food webs of different complexities. Abundance of prokaryotes, cell volume, prokaryotic heterotrophic production, chlorophyll a, abundance of heterotrophic flagellates, ciliates and phytoplankton were determined in several ponds in each saltern. Increases in salinity resulted in a progressive reduction in the abundance and number of different groups of eukaryotic microorganisms present, but an increase in biomass of prokaryotes. Maximal activity of both phyto- and bacterioplankton was found at a salinity of around 100 per thousand, where there was also a maximum in chlorophyll a concentration. Growth rates of heterotrophic prokaryotes decreased with increasing salinity. Bacterivory disappeared above 250 per thousand salinity, whereas other loss factors such as viral lysis appeared to be of minor importance throughout the gradient [Guixa-Boixereu et al. (1996) Aquat. Microb. Ecol. 11, 215-227].
在两个用于商业制盐的太阳能盐场中，沿着盐度梯度对微生物食物网进行了研究。盐场中的不同池塘提供了一系列具有不同复杂程度食物网的生态系统。在每个盐场的几个池塘中测定了原核生物的丰度、细胞体积、原核生物异养生产、叶绿素a、异养鞭毛虫、纤毛虫和浮游植物的丰度。盐度增加导致存在的不同真核微生物群体的丰度和数量逐渐减少，但原核生物的生物量增加。在盐度约为千分之一百时，浮游植物和浮游细菌的活性最高，此时叶绿素a浓度也最高。异养原核生物的生长速率随盐度增加而降低。在盐度高于千分之二百五十时，噬菌作用消失，而其他损失因素如病毒裂解在整个梯度中似乎不太重要[吉夏-博伊克斯雷乌等人（1996年）《水生微生物生态学》11卷，215 - 227页]。
