Production and ecosystem structure in cold‐core vs. warm‐core eddies: Implications for the zooplankton isoscape and rock lobster larvae
Production and ecosystem structure in cold‐core vs. warm‐core eddies: Implications for the zooplankton isoscape and rock lobster larvae
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冷核与暖核涡流中的生产和生态系统结构：对浮游动物等景观和岩龙虾幼虫的影响
DOI：
10.1002/lno.11192
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发表时间：
2019
影响因子：
4.5
通讯作者：
A. Jeffs
中科院分区：
文献类型：
--
作者：
A. Waite;E. Raes;L. Beckley;P. Thompson;D. Griffin;M. Saunders;Christin Säwström;R. O’Rorke;Miao Wang;Jason P. Landrum;A. Jeffs
东印度洋的反气旋（暖芯）中尺度涡旋（WCEs）比气旋（冷芯）涡旋（CCEs）具有更高的表面叶绿素特征。奇怪的是，WCEs主机岩龙虾幼虫（phyllosomas）与较低的脂质储存和蛋白质储备比phyllosomas在CCE，这表明较差的营养状况。我们评估初级生产力和浮游动物同位素数据，从八个漩涡在四个研究航次（2003-2011年），以确定这种矛盾可能会发生。我们发现WCE和CCE每单位叶绿素a的生产力相同，但深度整合初级生产力（PP）在具有较浅混合层（ML）的涡旋中更大，特别是在CCE中。由于密度跃层更接近地表，所以在CCE中的ML往往比在WCE中更浅。这一点，再加上CCE真光区的分层比WCE更强，支持了CCE中更大的鞭毛虫和甲藻种群。这些浮游植物为浮游动物提供了高质量的营养，浮游动物在具有最浅ML的CCE中平均低约0.6营养级进食，积累了高脂质储存。相反，WCEs的平均ML比CCE深约70 m，并拥有更多硅藻的浮游植物群落。硅藻为浮游动物提供较低质量的食物，WCEs中的浮游动物脂质储存随着营养水平下降，并且可能在初始（或季节性）营养注入后随着时间的推移而下降。因此，CCE中的叶状体比暖心漩涡中的叶状体具有更高的能量和脂质含量。解决的矛盾，因此，是较高的表面叶绿素签名的WCEs是不代表的营养价值的猎物领域的叶状体。我们还得出结论，混合层深度的年际变化发生在区域尺度上，控制PP。
Anticyclonic (warm‐core) mesoscale eddies (WCEs) in the Eastern Indian Ocean carry higher surface chlorophyll signatures than cyclonic (cold‐core) eddies (CCEs). Paradoxically, WCEs host rock lobster larvae (phyllosomas) with lower lipid stores and protein reserves than phyllosomas in CCEs, suggesting a poorer nutritional status. We assess primary productivity and zooplankton isotopic data from eight eddies across four research voyages (2003–2011) to determine how this contradiction might occur. We find that WCEs and CCEs are equally productive per unit chlorophyll a, but depth‐integrated primary production (PP) is greater in eddies with shallower mixed layers (MLs), especially in CCEs. MLs tend to be shallower in CCEs than in WCEs because the pycnocline is closer to the surface. This, in combination with stronger stratification in CCE euphotic zones than those of WCEs, supports greater flagellate and dinoflagellate populations in CCEs. These phytoplankton provide high‐quality nutrition for zooplankton, which feed on average ~ 0.6 trophic level lower in CCEs with the shallowest MLs, accumulating high lipid stores. Conversely, WCEs have, on average, ~ 70 m deeper MLs than CCEs, and host a phytoplankton community with more diatoms. Diatoms provide lower quality food for zooplankton, and zooplankton lipid stores in WCEs decline with trophic level, and possibly, with time after initial (or seasonal) nutrient injection. As a result, phyllosomas in CCEs have higher energy and lipid content than those in warm‐core eddies. The resolution of the paradox, therefore, is that the higher surface chlorophyll signatures of WCEs are not representative of the nutritional value of the prey field of the phyllosoma. We also conclude that interannual variations of mixed layer depth occur at a regional scale, controlling PP.
DOI：
10.1073/pnas.1309345110
发表时间：
2013-12-17
影响因子：
11.1
作者：
Assmy, Philipp;Smetacek, Victor;Wolf-Gladrow, Dieter
通讯作者：
Wolf-Gladrow, Dieter