Breakdown of phytoplankton pigments in Baltic sediments: effects of anoxia and loss of deposit-feeding macrofauna
Breakdown of phytoplankton pigments in Baltic sediments: effects of anoxia and loss of deposit-feeding macrofauna
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DOI：
10.1016/s0022-0981(00)00212-4
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发表时间：
2000-08-30
影响因子：
2
通讯作者：
Elmgren, R
中科院分区：
文献类型：
--
作者：
Bianchi, TS;Johansson, B;Elmgren, R
我们研究了叶绿素a和类胡萝卜素岩藻黄质III氧化和缺氧的沉积物微观世界的衰减，有和没有沉积物喂养的底栖端足类动物Monoporeia affinis，在57天，在5摄氏度，深冻浮游植物从波罗的海适当的添加到所有，但少数微观世界。在添加植物浮游生物的微宇宙中观察到的叶绿素a和岩藻黄质衰减速率常数的范围为0.04-0.07天（-1）。最快的色素衰减和建立的叶绿素分解产物后，浮游植物除了被发现在好氧处理与片足类动物。在缺氧处理中，或在没有浮游植物添加的处理中，没有发现端足类动物对色素分解的影响。57天后，好氧（96%）比缺氧（80%）处理的叶绿素a的损失更大，表明沉积有机质的保存将在缺氧期间得到加强。由于波罗的海沉积物中的补充和同化缓慢，一次缺氧事件就可能导致长期（数年）缺乏重要的大型底栖动物。因此，缺氧事件不仅会减少植物色素的腐烂，而且可能会减少其他有机物的腐烂，因为它们会持续下去，而且还会通过消除大型动物产生长期影响，因为大型动物在出现时会促进有机物的分解。(C)2000 Elsevier Science B. V.保留所有权利。
We examined the decay of chlorophyll a and the carotenoid fucoxanthin iii oxic and anoxic sediment microcosms, with and without the deposit-feeding benthic amphipod Monoporeia affinis, over 57 days at 5 degrees C, Deep frozen phytoplankton from the Baltic Sea proper was added to all but a few microcosms. The range of chlorophyll a and fucoxanthin decay rate constants observed in microcosms with phytoplanton addition was 0.04-0.07 day(-1). The fastest pigment decay and build-up of chlorophyll breakdown products after phytoplankton addition were found in oxic treatments with amphipods. No effects of amphipods on pigment breakdown were found in anoxic treatments, or in treatments without phytoplankton addition. Greater losses of chlorophyll a in oxic (96%) than in anoxic (80%) treatments after 57 days indicates that preservation of sedimentary organic matter will be enhanced during periods of anoxia. Due to slow recruitment and recolonization in Baltic sediments, a single anoxic event may cause long-term (years) absence of significant macrobenthos. Anoxic events will thus not only reduce decay of plant pigments, and presumably other organic matter, while they last, but will also have longer-term effects, through elimination of macrofauna, which when present enhance organic matter decomposition. (C) 2000 Elsevier Science B.V. All rights reserved.