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Production and ecosystem structure in cold-core vs. warm-core eddies: Implications for the zooplankton isoscape and rock lobster larvae

文献类型： 外文期刊

作者： Waite, Anya M. 1 ; Raes, Eric 3 ; Beckley, Lynnath E. 7 ; Thompson, Peter A. 6 ; Griffin, David 6 ; Saunders, Megan 8 ;

作者机构： 1.Univ Western Australia, Sch Civil Environm & Min Engn, Crawley, WA, Australia

2.Univ Western Australia, Oceans Inst, Crawley, WA, Australia

3.Univ Bremen, Helmholz Ctr Polar & Marine Res, Alfred Wegener Inst, Bremen, Germany

4.Dalhousie Univ, Ocean Frontier Inst, 1355 Oxford St, Halifax, NS, Canada

5.Dalhousie Univ, Dept Oceanog, 1355 Oxford St, Halifax, NS, Canada

6.CSIRO Oceans & Atmosphere, Hobart, Tas, Australia

7.Murdoch Univ, Environm & Conservat Sci, Murdoch, WA, Australia

8.Univ Queensland, Sch Chem Engn, St Lucia, Qld, Australia

9.Edith Cowan Univ, CMER, Sch Sci, Joondalup, WA, Australia

10.Univ Auckland, Inst Marine Sci, Auckland, New Zealand

11.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Key Lab Trop & Subtrop Fishery Resource Applicat, Guangzhou, Guangdong, Peoples R China

12.Pew Charitable Trusts, Lenfest Ocean Program, Washington, DC USA

期刊名称：LIMNOLOGY AND OCEANOGRAPHY （ 影响因子：4.745； 五年影响因子：5.203 ）

ISSN： 0024-3590

年卷期： 2019 年 64 卷 6 期

页码：

收录情况： SCI

摘要： 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.

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