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Salps in the Lazarev Sea, Southern Ocean: I. Feeding dynamics

机译：南大洋拉扎列夫海的鱼：I.饲养动态

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摘要

Feeding dynamics of the Antarctic salps Ihlea racovitzai and Salpa thompsoni were studied in the Lazarev Sea in fall 2004, summer 2005-2006 and winter 2006. Pigment concentrations in the guts of both species were positively correlated with ambient surface chlorophyll a (chl a). No evidence was found for salp clogging even at dense surface concentrations of up to 7 μg chl a L~(-1). However, gut pigment concentrations had a lower range than ambient pigment concentrations, suggesting that salps increased retention times of ingested material in low-food environments. For medium-sized /. racovitzai and 5. thompsoni, estimated individual daily rations reached 7-10 and >100% of body carbon in winter and summer, respectively. Daily respiratory needs of /. racovitzai and 5. thompsoni accounted for 28 and 22% of daily carbon assimilation based on pigment ingestion rates in winter, and for 2 and 1% in summer, respectively. The grazing impact of the salp populations on the phytoplankton standing stock was negligible during all seasons due to generally low salp densities. Fatty acid trophic biomarkers in the salps suggest high year-round contributions of flagellates and modest contributions of diatoms to the salp's diet. These markers showed low seasonal variability for I. racovitzai. The more pronounced seasonality of trophic markers in S. thompsoni were likely related to their generally deeper residence depth in winter linked to a seasonal alternation of sexual and asexual generations.
机译：2004年秋季，2005-2006年夏季和2006年冬季，在拉扎列夫海研究了南极小sal Ihlea racovitzai和Salpa thompsoni的进食动态。这两种物种的肠道中的色素浓度均与周围表面叶绿素a（chl a）正相关。即使在高达7μgchl a L〜（-1）的致密表面浓度下，也没有发现沙门阻塞的证据。但是，肠道色素的浓度范围比周围色素的浓度范围低，这表明在低食物环境中，胡扯增加了被摄入物质的保留时间。适用于中号/。 racovitzai和5. thompsoni，估计个人的日定量在冬季和夏季分别达到7-10和100％的人体碳。每天的呼吸需要量为/。根据冬季的色素摄入率，racovitzai和5. thompsoni分别占每日碳同化的28％和22％，夏季分别占2％和1％。在整个季节，由于总体上低的鲑鱼密度，鲑鱼种群对浮游植物站立种群的放牧影响可忽略不计。 sal中的脂肪酸营养生物标志物表明鞭毛的全年高贡献和硅藻对to饮食的适度贡献。这些标记显示了racovitzai的低季节性变化。索氏链球菌中营养标记的季节性更为明显，可能与它们在冬季普遍更深的居住深度有关，这与性世代和无性世代的季节性交替有关。

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  • 来源
    《Marine biology》 |2011年第9期|p.2009-2026|共18页
  • 作者

    Lena von Harbou; Corinna D. Dubischar; Evgeny A. Pakhomov; Brian P. V. Hunt; Wilhelm Hagen; Ulrich V. Bathmann;

  • 作者单位

    Alfred Wegener Institute for Polar and Marine Research,Am Handelshafen 12, 27515 Bremerhaven, Germany;

    Alfred Wegener Institute for Polar and Marine Research,Am Handelshafen 12, 27515 Bremerhaven, Germany;

    Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada;

    Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada;

    Marine Zoology, University of Bremen,P.O. Box 330440, 28334 Bremen, Germany;

    Alfred Wegener Institute for Polar and Marine Research,Am Handelshafen 12, 27515 Bremerhaven, Germany;

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