Journal article
Production and ecosystem structure in cold‐core vs. warm‐core eddies: Implications for the zooplankton isoscape and rock lobster larvae
Limnology and Oceanography, Vol.64(6), pp.2405-2423
2019
Abstract
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.
Details
- Title
- Production and ecosystem structure in cold‐core vs. warm‐core eddies: Implications for the zooplankton isoscape and rock lobster larvae
- Authors/Creators
- A.M. Waite (Author/Creator) - The University of Western AustraliaE. Raes (Author/Creator) - Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und MeeresforschungL.E. Beckley (Author/Creator) - Murdoch UniversityP.A. Thompson (Author/Creator) - Hobart CorporationD. Griffin (Author/Creator) - Hobart CorporationM. Saunders (Author/Creator) - The University of QueenslandC. Säwström (Author/Creator) - Edith Cowan UniversityR. O'Rorke (Author/Creator) - University of AucklandM. Wang (Author/Creator) - Chinese Academy of Fishery SciencesJ.P. Landrum (Author/Creator) - Pew Charitable TrustsA. Jeffs (Author/Creator) - University of Auckland
- Publication Details
- Limnology and Oceanography, Vol.64(6), pp.2405-2423
- Publisher
- Wiley-Blackwell
- Identifiers
- 991005542310507891
- Copyright
- © 2019 The Authors
- Murdoch Affiliation
- School of Environmental and Conservation Sciences
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.2 Marine Biology
- 3.2.154 Phytoplankton Dynamics
- Web Of Science research areas
- Limnology
- Oceanography
- ESI research areas
- Environment/Ecology