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首页> 外文期刊>Estuarine Coastal and Shelf Science >Selective uptake of prokaryotic picoplankton by a marine sponge (Callyspongia sp.) within an oligotrophic coastal system
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Selective uptake of prokaryotic picoplankton by a marine sponge (Callyspongia sp.) within an oligotrophic coastal system

机译：贫营养性沿海系统中海洋海绵（Callyspongia sp。）对原核微微浮游生物的选择性吸收

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摘要

Marine sponges are key players in the transfer of carbon from the pelagic microbial food web into the benthos. Selective uptake of prokaryotic picoplankton (<2 μm) by a demosponge (Callyspongia sp.), and carbon flux through this process, were examined for the first time in the oligotrophic coastal waters of southwestern Australia, where sponge abundance and biodiversity ranks among the highest in the world. Water sampling and flow rate measurements were conducted over five sampling occasions following the InEx method of Yahel et al. (2005), with heterotrophic bacteria and autotrophic Synechococcus cyano-bacteria identified and enumerated by flow cytometry. Callyspongia sp. demonstrated high filtration efficiencies, particularly for high DNA (HDNA) bacteria (up to 85.3% in summer 2008) and Synechococcus (up to 91.1 % in autumn 2007), however efficiency varied non-uniformly with time and food type (p < 0.01). Overall filtration efficiency for Synechococcus (86.6 ± 6.3%; mean ± s.d.) was always significantly higher (p<0.05) than for low DNA (LDNA) bacteria (40 ±17.2%), except during winter 2007 (p = 0.14) when ambient Synechococcus concentrations were lowest. When compared to ambient abundances of the different food types, Callyspongia sp. exhibited consistently negative selectivity for LDNA bacteria and positive selectivity for Synechococcus, while HDNA bacteria was generally a neutral or positive selection. The total carbon removal rate (sum of all prokaryotic picoplankton cells), calculated on a per unit area basis, varied significantly with time (p < 0.01), with lowest rates recorded during the winter (0.5 ± 0.4-0.6 ± 0.8 mg C m~(-2) d~(-1)) and highest values recorded in summer (3.5 ± 1.9 mg C m~(-2) d~(-1)). These flux estimates quantify the role of a demosponge species in the ultimate fate of prokaryotic picoplankton within the nearshore food webs of southwestern Australia, and support the conclusion that sponges actively select food particles that optimise their nutritional intake.
机译：海洋海绵是将碳从中层微生物食物网转移到底栖动物中的关键参与者。在澳大利亚西南部的贫营养性沿海水域中，首次检测了脱粘海绵（Callyspongia sp。）对原核皮层浮游生物（<2μm）的选择性吸收以及通过该过程的碳通量，其中海绵丰度和生物多样性位居最高在世界上。按照Yahel等人的InEx方法，在五个采样时机进行了水采样和流量测量。 （2005），通过流式细胞术鉴定并列举了异养细菌和自养蓝藻蓝藻细菌。 Callyspongia sp。表现出较高的过滤效率，特别是对于高DNA（HDNA）细菌（2008年夏季高达85.3％）和Synechococcus（2007年秋季高达91.1％），但是效率随时间和食物类型的变化而不一致（p <0.01） 。 Synechococcus的总体过滤效率（86.6±6.3％;平均±sd）始终显着高于低DNA（LDNA）细菌（40±17.2％）（p <0.05），除了2007年冬季（p = 0.14）球菌浓度最低。与不同食物类型的环境丰富度相比，Callyspongia sp。对LDNA细菌表现出一致的负选择性，对Synechococcus表现出正选择性，而HDNA细菌通常呈中性或阳性选择。以每单位面积为基础计算的总碳去除率（所有原核微微浮游细胞的总和）随时间变化显着（p <0.01），冬季记录的最低去除率（0.5±0.4-0.6±0.8 mg C m 〜（-2）d〜（-1））和夏季记录的最高值（3.5±1.9 mg C m〜（-2）d〜（-1））。这些通量估计值量化了棉铃虫物种在澳大利亚西南部近岸食物网内原核微微浮游生物最终命运中的作用，并支持海绵积极选择食物颗粒以优化其营养摄入量的结论。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2009年第2期|289-297|共9页
  • 作者

    Christine E. Hanson; M.James McLaughlin; Glenn A. Hyndes; Joanna Strzelecki;

  • 作者单位

    Centre for Marine Ecosystems Research, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia School of Environmental Systems Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;

    Centre for Marine Ecosystems Research, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia CSIRO Marine and Atmospheric Research, Floreat Laboratories, Private Bag 5, Wembley, WA 6913, Australia;

    Centre for Marine Ecosystems Research, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia;

    CSIRO Marine and Atmospheric Research, Floreat Laboratories, Private Bag 5, Wembley, WA 6913, Australia;

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  • 正文语种 eng
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  • 关键词

    suspension feeding; InEx; flow cytometry; Synechococcus; heterotrophic bacteria; southwestern Australia;

    机译：悬浮饲料InEx;流式细胞仪球菌;异养细菌澳大利亚西南部;

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