碳氮结合影响浮游生物食物网对富集的响应

IF 1.6 4区 环境科学与生态学 Q3 ECOLOGY
Junwen Guo, Sonia Brugel, Agneta Andersson, Mehdi Cherif
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引用次数: 0

摘要

摘要/ ABSTRACT摘要:在水生生态系统中,浮游食物网底部的氮主要有两种形式:溶解有机氮(DON)和溶解无机氮(DIN)。在DON中,N与有机C相关,可能促进异养和自养。在硝酸丁是主要的N形式和可解离溶解有机C (DOC)的环境中,异养生物也可能被促进,但它们可能与自养生物竞争DIN。相关或解离的CN营养源对生物体与食物网功能之间相互作用的影响知之甚少,以前也没有研究过。为了解决这个问题,我们在一个沿海微生物食物网中进行了一个微观实验,其中氮和碳的营养来源要么以1种分子化合物(DON)相关联,要么以2种分离的分子化合物(DIN和DOC)相分离。结果表明,C和N输入的结合或分离对所有营养水平都有显著影响,最可能是通过其对细菌-浮游植物相互作用的影响,这种相互作用在增加耦合和增加竞争之间转换。食物网所有组成部分的生物量都受益于单个DON分子中C和N的结合。我们的研究表明,碳氮之间的关联程度是影响微生物食物网生产力和效率的重要因素。因此,在研究水生系统时应考虑碳和氮的关联。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Carbon-nitrogen association influences response of the microplankton food web to enrichment
ABSTRACT: In aquatic ecosystems, there are 2 major forms of N available at the base of the planktonic food web: dissolved organic N (DON) and dissolved inorganic N (DIN). In DON, N is associated with organic C, which may promote both heterotrophs and autotrophs. In environments where DIN nitrate is the prevailing N form and dissociated dissolved organic C (DOC) is available, heterotrophs may also be promoted, but they may compete with the autotrophs for DIN. The influence of associated or dissociated CN nutrient sources on the interaction between organisms and the food web function is poorly known and has not been studied before. To approach this question, we performed a microcosm experiment with a coastal microbial food web, where N and C nutrient sources were provided either associated in 1 molecular compound (DON), or dissociated in 2 separate molecular compounds (DIN and DOC). The results showed that association or dissociation of C and N input had marked effects on all trophic levels, most probably through its effect on bacteria-phytoplankton interaction, which switched between increased coupling and increased competition. The biomass of all components of the food web benefitted from the association of C and N in a single DON molecule. Our study indicated that the degree of association between C and N is an important factor affecting the productivity and efficiency of the microbial food web. Therefore, the C and N association should be considered when studying aquatic systems.
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来源期刊
Aquatic Microbial Ecology
Aquatic Microbial Ecology 环境科学-海洋与淡水生物学
CiteScore
3.30
自引率
0.00%
发文量
8
审稿时长
3.0 months
期刊介绍: AME is international and interdisciplinary. It presents rigorously refereed and carefully selected Research Articles, Reviews and Notes, as well as Comments/Reply Comments (for details see AME 27:209), Opinion Pieces (previously called ''As I See It'') and AME Specials. For details consult the Guidelines for Authors. Papers may be concerned with: Tolerances and responses of microorganisms to variations in abiotic and biotic components of their environment; microbial life under extreme environmental conditions (climate, temperature, pressure, osmolarity, redox, etc.). Role of aquatic microorganisms in the production, transformation and decomposition of organic matter; flow patterns of energy and matter as these pass through microorganisms; population dynamics; trophic interrelationships; modelling, both theoretical and via computer simulation, of individual microorganisms and microbial populations; biodiversity. Absorption and transformation of inorganic material; synthesis and transformation of organic material (autotrophic and heterotrophic); non-genetic and genetic adaptation; behaviour; molecular microbial ecology; symbioses.
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