Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica
Krill availability in adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica
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南极洲帕尔默站附近邻近阿德利企鹅和巴布亚企鹅觅食区的磷虾供应情况
DOI：
10.1002/lno.11750
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发表时间：
2021
影响因子：
4.5
通讯作者：
Schofield, Oscar
中科院分区：
文献类型：
--
作者：
Nardelli, Schuyler C.;Cimino, Megan A.;Conroy, John A.;Fraser, William R.;Steinberg, Deborah K.;Schofield, Oscar
沿着南极半岛西部的帕尔默深峡谷是一个生物热点，有丰富的浮游植物和磷虾，支持峡谷顶端的阿德利企鹅和巴布亚企鹅栖息地。近岸研究主要集中在驱动初级生产和企鹅觅食的物理机制上，但对更细尺度的磷虾分布和密度知之甚少。我们设计了两个声学调查网格与电导率温度深度配置文件内相邻的阿德利企鹅和巴布亚企鹅觅食区附近的帕尔默站，南极洲。这些网格于2019年1月至3月进行采样，以评估磷虾可用性的变化及其与海洋学特性的关联。磷虾密度在这两个地区是相似的，但磷虾群更长，更大的gentoo觅食区，这也是分层少，叶绿素浓度较低。在企鹅聚居地附近的近岸区域，深度整合的磷虾密度从夏季到秋季（1月至3月）增加，与叶绿素浓度无关，这表明生活史驱动的成年磷虾迁移，而不是资源驱动的生物量增加。磷虾生物量的白天深度加深，通过夏季和成为脱钩的叶绿素最大值在3月昼夜垂直迁移幅度可能增加。在我们的研究中，帕尔默站附近的企鹅似乎没有受到磷虾可用性的限制，磷虾深度的区域差异与两种企鹅的觅食行为相匹配。了解南极沿海热点地区的精细尺度物理强迫和生态相互作用对于预测环境变化将如何影响这些生态系统至关重要。
The Palmer Deep canyon along the West Antarctic Peninsula is a biological hotspot with abundant phytoplankton and krill supporting Adélie and gentoo penguin rookeries at the canyon head. Nearshore studies have focused on physical mechanisms driving primary production and penguin foraging, but less is known about finer‐scale krill distribution and density. We designed two acoustic survey grids paired with conductivity–temperature–depth profiles within adjacent Adélie and gentoo penguin foraging regions near Palmer Station, Antarctica. The grids were sampled from January to March 2019 to assess variability in krill availability and associations with oceanographic properties. Krill density was similar in the two regions, but krill swarms were longer and larger in the gentoo foraging region, which was also less stratified and had lower chlorophyll concentrations. In the inshore zone near penguin colonies, depth‐integrated krill density increased from summer to autumn (January–March) independent of chlorophyll concentration, suggesting a life history‐driven adult krill migration rather than a resource‐driven biomass increase. The daytime depth of krill biomass deepened through the summer and became decoupled from the chlorophyll maximum in March as diel vertical migration magnitude likely increased. Penguins near Palmer Station did not appear to be limited by krill availability during our study, and regional differences in krill depth match the foraging behaviors of the two penguin species. Understanding fine‐scale physical forcing and ecological interactions in coastal Antarctic hotspots is critical for predicting how environmental change will impact these ecosystems.
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DOI：
10.1016/j.dsr2.2011.08.002
发表时间：
2012-01-01
影响因子：
3
作者：
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通讯作者：
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影响因子：
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DOI：
--
发表时间：
2011
期刊：
影响因子：
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DOI：
--
发表时间：
2015
期刊：
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影响因子：
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作者：
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