Beyond biomass: Resource effects on primary production and consumer nutrient assimilation in streams

IF 2.8 2区 生物学 Q2 ECOLOGY Freshwater Biology Pub Date : 2024-07-17 DOI:10.1111/fwb.14310
Alexandra Schlenker, Mario Brauns, Patrick Fink, Markus Weitere
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超越生物量:资源对溪流初级生产和消费者营养同化的影响
水生生态系统的初级生产受资源供应(自下而上)的强烈控制。同时,食草动物对藻类施加自上而下的压力。资源和食草动物对藻类群落的影响已在底栖和浮游系统中得到广泛研究。然而,大多数研究只关注对藻类存量的净影响,而对其背后的生态功能和过程却往往一无所知。在这里,我们测试了光照(L)和限制性养分磷(P)这两种资源对底栖藻类(浮游植物)初级生产(净氧生产)和下一营养级同化作用(特别是食草动物的氮同化作用)的影响。为此,我们在溪流中层水槽中种植了天然的浮游生物群落,同时还种植了两种本地食草类群和 15N 作为示踪剂。两种资源最初都会增加净初级生产量,但在更成熟的群落中,这种效应在 36 天后趋于平衡。虽然两种资源对藻类生物量仍有很强的积极影响,但生物量的净初级生产量随资源水平的提高而降低,在双高(+L,+P)处理中最低。食草动物的氮同化反应与其生物量相比,与围岩质量(化学计量和分类组成)的反应关系更为密切。此外,光对两种食草动物的氮同化都有负面影响。这些研究结果表明,生态功能(这里指初级生产和食草动物的同化作用)的反应并不一定与藻类生物量成正比,因此不容易从常用的生物量作为功能的代表来预测。
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来源期刊
Freshwater Biology
Freshwater Biology 生物-海洋与淡水生物学
CiteScore
5.90
自引率
3.70%
发文量
162
审稿时长
2 months
期刊介绍: Freshwater Biology publishes papers on all aspects of the ecology of inland waters, including rivers and lakes, ground waters, flood plains and other freshwater wetlands. We include studies of micro-organisms, algae, macrophytes, invertebrates, fish and other vertebrates, as well as those concerning whole systems and related physical and chemical aspects of the environment, provided that they have clear biological relevance. Studies may focus at any level in the ecological hierarchy from physiological ecology and animal behaviour, through population dynamics and evolutionary genetics, to community interactions, biogeography and ecosystem functioning. They may also be at any scale: from microhabitat to landscape, and continental to global. Preference is given to research, whether meta-analytical, experimental, theoretical or descriptive, highlighting causal (ecological) mechanisms from which clearly stated hypotheses are derived. Manuscripts with an experimental or conceptual flavour are particularly welcome, as are those or which integrate laboratory and field work, and studies from less well researched areas of the world. Priority is given to submissions that are likely to interest a wide range of readers. We encourage submission of papers well grounded in ecological theory that deal with issues related to the conservation and management of inland waters. Papers interpreting fundamental research in a way that makes clear its applied, strategic or socio-economic relevance are also welcome. Review articles (FRESHWATER BIOLOGY REVIEWS) and discussion papers (OPINION) are also invited: these enable authors to publish high-quality material outside the constraints of standard research papers.
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