Relationship between chlorophyll a concentration, light attenuation and diving depth of the Southern elephant seal Mirounga leonina.
Relationship between chlorophyll a concentration, light attenuation and diving depth of the Southern elephant seal Mirounga leonina.
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DOI：
10.1371/journal.pone.0047444
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Guinet C
中科院分区：
文献类型：
--
作者：
Jaud T;Dragon AC;Garcia JV;Guinet C
最近，一些南极海洋环境研究利用从仪器化顶级捕食者收集的海洋学参数来获取生态和物理信息。浮游植物浓度通常通过叶绿素荧光的主动测量来量化。本研究采用光吸收系数（K0.75）作为浮游植物浓度的指标。这种测量易于获得且需要低电力，可以评估浮游植物的精细水平结构。作为这项研究的一部分，南象海豹 (SES) 同时配备了荧光计和光记录仪。沿着 SES 轨迹，K0.75 的变化与叶绿素（由荧光计在透光层内测量的浓度）密切相关。对于SES的觅食行为，海豹潜入水底的深度高度依赖于150 m处的光照强度，这表明SES的猎物如蜈蚣等的垂直分布与光照水平密切相关。因此，浮游植物浓度的变化不仅可能对SES的猎物丰度产生直接影响，而且还可能决定它们的垂直可达性，从而可能对SES的觅食效率产生影响。
Recently, a number of Antarctic marine environmental studies have used oceanographic parameters collected from instrumented top predators for ecological and physical information. Phytoplankton concentration is generally quantified through active measurement of chlorophyll fluorescence. In this study, light absorption coefficient (K0.75) was used as an indicator of phytoplankton concentration. This measurement, easy to obtain and requiring low electric power, allows for assessing of the fine scale horizontal structuring of phytoplankton. As part of this study, Southern elephant seals (SES) were simultaneously equipped with a fluorometer and a light logger. Along the SES tracks, variations in K0.75 were strongly correlated with chlorophyll, a concentration measured by the fluorometer within the euphotic layer. With regards to SES foraging behaviour, bottom depth of the seal’s dive was highly dependent on light intensity at 150 m, indicating that the vertical distribution of SES’s prey such as myctophids is tightly related to light level. Therefore, change in phytoplankton concentration may not only have a direct effect on SES’s prey abundance but may also determine their vertical accessibility with likely consequences on SES foraging efficiency.
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影响因子：
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作者：
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通讯作者：
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DOI：
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