Centre for Environmental and Marine Studies & Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal.
Mar Pollut Bull. 2012 Feb;64(2):263-71. doi: 10.1016/j.marpolbul.2011.11.020. Epub 2011 Dec 16.
We compare the environmental characteristics and bacterial communities associated with two rushes, Juncus maritimus and Bolboschoenus maritimus, and adjacent unvegetated habitat in a salt marsh subjected to historical mercury pollution. Mercury content was higher in vegetated than unvegetated habitat and increased with sampling depth. There was also a significant relationship between mercury concentration and bacterial composition. Habitat (Juncus, Bolboschoenus or unvegetated), sample depth, and the interaction between both, however, explained most of the variation in composition (~70%). Variation in composition with depth was most prominent for the unvegetated habitat, followed by Juncus, but more constrained for Bolboschoenus habitat. This constraint may be indicative of a strong plant-microbe ecophysiological adaptation. Vegetated habitat contained distinct bacterial communities associated with higher potential activity of aminopeptidase, β-glucosidase and arylsulphatase and incorporation rates of (14)C-glucose and (14)C-acetate. Communities in unvegetated habitat were, in contrast, associated with both higher pH and proportion of sulphate reducing bacteria.
我们比较了两个芦苇，即盐沼地中受历史汞污染影响的盐角草（Juncus maritimus）和扁秆藨草（Bolboschoenus maritimus），以及毗邻无植被生境的环境特征和相关细菌群落。有植被的生境中的汞含量高于无植被的生境，且随采样深度增加而增加。汞浓度与细菌组成之间也存在显著的相关性。然而，生境（盐角草、扁秆藨草或无植被）、采样深度以及两者之间的相互作用解释了大部分组成的变化（约 70%）。无植被生境的组成随深度的变化最为显著，其次是盐角草，但扁秆藨草生境的变化更为受限。这种限制可能表明植物-微生物之间存在强烈的生理生态适应。有植被的生境含有独特的细菌群落，与较高的氨肽酶、β-葡萄糖苷酶和芳基硫酸酯酶活性以及（14）C-葡萄糖和（14）C-乙酸盐的掺入率相关。相比之下，无植被生境中的群落与较高的 pH 值和硫酸盐还原菌的比例相关。
