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首页> 外文期刊>Marine ecology progress series >Diurnal bioturbating activities of Monoporeia affinis: effects on benthic oxygen and nutrient fluxes
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Diurnal bioturbating activities of Monoporeia affinis: effects on benthic oxygen and nutrient fluxes

机译：单孢菌的昼夜生物扰动活动：对底氧和养分通量的影响

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ABSTRACT: A laboratory experiment was carried out to investigate the overall effects from the diurnal bioturbating activities of Monoporeia affinis on benthic solute fluxes. Investigations were performed on Baltic Sea sediments during a 12:12 h light:dark cycle, where light conditions (1 µmol photons m–2 s–1) corresponded to those at a simulated water depth of 25 m in July. Oxygen consumption, nutrient [NO2– + NO3–, NH4+, Si(OH)4 and HPO42–] fluxes and denitrification rates were analysed after organic material enrichment (5 g C m–2) of the sediment. Significant effects from the diurnal activity of M. affinis could be observed, as enhanced solute fluxes of O2, NO2– + NO3–, NH4+ and HPO42– were found during day (light) compared to night (dark) treatments. The diurnal activity of M. affinis showed no effect on denitrification rates. Irrigation of M. affinis, however, stimulated denitrification of the nitrate supplied from the overlying water (Dw) by about 50% compared to the control (no macrofauna). No effect on coupled nitrification/denitrification (Dn) was found. Diurnal activity of meiofauna seemed to have effects on solute fluxes as control cores (no macrofauna) also showed enhanced fluxes during the day compared to at night. In addition, effects from the endogenous diurnal activity of M. affinis were observed in cores kept in total darkness. This study highlights the importance of diurnal activity patterns of benthic fauna during studies of nutrient dynamics and sediment mineralisation processes.
机译：摘要：进行了一项室内实验，以研究莫诺孢菌的每日生物扰动活动对底栖溶质通量的总体影响。在12:12 h的光：暗周期中对波罗的海沉积物进行了研究，其中的光照条件（1 µmol光子m –2 s -1 ）对应于7月的模拟水深为25 m。氧气消耗，养分[NO 2 – + NO 3 – ，NH 4 有机材料后分析了 + ，Si（OH） 4 和HPO 4 2-]的通量和反硝化速率富集（5 g C m –2 ）。 I的昼夜活动产生重大影响。可以观察到亲和力，因为O 2 ，NO 2 – + NO 3 – ，NH 4 + 和HPO 4 2 – （光）与夜间（黑暗）治疗相比。 M的昼夜活动。 affinis 对反硝化率没有影响。灌溉。然而，亲和性比上一个对照（无大型动物）刺激了上层水（Dw）提供的硝酸盐的反硝化作用约50％。没有发现对耦合硝化/反硝化作用（Dn）的影响。小型动物的昼夜活动似乎对溶质通量有影响，因为对照核心（无大型动物）在白天的通量比晚上有所增加。此外，还受到I M内源性昼夜活动的影响。在完全黑暗的核心中观察到了亲和力。这项研究强调了底栖动物日活动模式在营养动力学和沉积物矿化过程研究中的重要性。

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