Growth of submerged and emergent macrophytes was studied together with heterotrophic bacterioplankton abundance and production in two Hungarian shallow lakes with dominant macrophyte covers. It was expected that bacterioplankton numbers and activity would have an effect on macrophyte biomass accumulation. Bacterial production and abundance showed a strong seasonal pattern with maximum in the warmest months (July, August). It was found that macrophyte biomass increased with heterotrophic bacterial production and abundance up to 5.6 µg C l− 1 h− 1 and 5.30*106 cells, respectively, while over that value was negatively associated with macrophyte growth. It was also shown that the relationship between heterotrophic bacteria and macrophytes also varied seasonally, showing a multifaceted relationship. It was demonstrated that macrophytes are not only the most significant carbon and energy source for the bacteria in shallow, macrophyte-dominated lakes, but are also competing organisms that could be supressed by excessive bacterial activity. These findings could help better understand the interaction between macrophytes and bacterioplankton, and assist wetland managers in quantifying what may be a primary cause of reed die-back.

中文翻译：

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大型植物覆盖度高的浅湖浮游细菌与大型植物的相互作用

研究了沉水和挺水大型植物的生长以及异养浮游细菌丰度和产量在两个具有主要大型植物覆盖的匈牙利浅湖中。预计浮游细菌数量和活性会对大型植物生物量积累产生影响。细菌产量和丰度表现出强烈的季节性模式，在最温暖的月份（7 月、8 月）达到最大值。发现大型植物生物量随着异养细菌产量和丰度的增加而增加，分别高达 5.6 µg C l− 1 h− 1 和 5.30*106 个细胞，而超过该值与大型植物生长呈负相关。还表明异养细菌与大型植物之间的关系也随季节变化，呈现出多方面的关系。研究表明，大型植物不仅是浅水、大型植物占主导地位的湖泊中细菌最重要的碳和能源来源，而且还是可能被过度细菌活动抑制的竞争生物。这些发现有助于更好地了解大型植物和浮游细菌之间的相互作用，并帮助湿地管理者量化可能是芦苇枯死的主要原因。