Effects of plankton community structure on energy pathways and tropic efficiency (PATH)

浮游生物群落结构对能量途径和热带效率（PATH）的影响

• 批准号: 190110099
• 负责人: Professorin Dr. Monika Winder
• 金额: --
• 依托单位: Institutionen för ekologi, miljö och botanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/190110099?language=en
• 关键词: Effects; plankton; community; structure; energy

A current challenge to ecologists is to predict how compositional shifts at the base of the aquatic food web propagate up to higher trophic levels. Energy or resource availability for upper trophic levels is governed by food-chain length and by factors that regulate the rate of energy transfer from primary producers to consumers. The goal of this project is to test the overall prediction that phytoplankton community structure and species composition are key regulators of energy and food quality transfer to mesozooplankton. We will (i) test the stability of fatty acid-specific δ13C isotope between the phytoplankton-zooplankton interface, which will be an important requirement as biomarker for trophic interactions, and (ii) manipulate natural microbial species composition and bacterial activity in mesocosms and measure carbon and nutritional transfer efficiency to copepods and their interactive effects with appendicularians. Copepods are a key link for carbon and nutritional flux and appendicularians are abundant filter-feeding organisms that are expected to increase with climate warming. Trophic efficiency will be estimated from production rates, dietary sources and nutritional transfer using combined fatty acid-specific δ13C isotope biomarkers. An improved understanding on how shifts in food-web structure affects energy and carbon flux through the plankton food web will be important because these processes have profound influence on fisheries and climate.

生态学家目前面临的一个挑战是预测水生食物网底部的成分变化如何传播到更高的营养级。高营养级的能源或资源供应取决于食物链的长度和调节初级生产者向消费者的能源转移速度的因素。该项目的目标是检验浮游植物群落结构和物种组成是向中型浮游动物转移能量和食物质量的关键调节器的总体预测。我们将（i）测试脂肪酸特异性δ 13 C同位素在浮游植物-浮游动物界面之间的稳定性，这将是营养相互作用的生物标志物的重要要求，（ii）操纵围隔生态系统中的天然微生物物种组成和细菌活性，并测量碳和营养向桡足类的转移效率及其与浮游动物的相互作用效应。桡足类是碳和营养通量的关键环节，而浮游动物是大量的滤食性生物，预计随着气候变暖，它们的数量将增加。营养效率将使用组合的脂肪酸特异性δ 13 C同位素生物标志物从生产率、膳食来源和营养转移来估计。更好地了解食物网结构的变化如何通过浮游生物食物网影响能量和碳通量将是重要的，因为这些过程对渔业和气候有着深远的影响。

项目成果

Meta-analysis of amino acid stable nitrogen isotope ratios for estimating trophic position in marine organisms

• DOI: 10.1007/s00442-015-3305-7
• 发表时间: 2015-07-01
• 期刊: OECOLOGIA
• 影响因子: 2.7
• 作者: Nielsen, Jens M.;Popp, Brian N.;Winder, Monika
• 通讯作者: Winder, Monika

Increased appendicularian zooplankton alter carbon cycling under warmer more acidified ocean conditions

在温暖、酸化的海洋条件下，附肢浮游动物年龄碳循环增加

• DOI: 10.1002/lno.10516
• 发表时间: 2017
• 期刊: Limnology and Oceanography
• 影响因子: 4.5
• 作者: Winder M;Bermudez JR;Bouquet JM;Hansen T;Brandes J;Berger S;Sazhin A; Jens C. Nejstgaard;Ulf BåmstedtHans H. Jakobsen;Jörg Dutz;Frischer ME;Troedsson C;Thompson E
• 通讯作者: Thompson E