Food web structure in two counter-rotating eddies based on δ15N and δ13C isotopic analyses

Waite, Anya M.; Muhling, Barbara A.; Holl, Carolyn M.; Beckley, L.E.; Montoya, Joseph P.; Strzelecki, Joanna; Thompson, Peter A.; Pesant, Stéphane

doi:10.1016/j.dsr2.2006.12.010

Cited by 90 publications

(102 citation statements)

References 60 publications

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“…Furthermore, experimental feeding of P. cygnus phyllosomas of the same developmental stages as examined in this current study showed that lipid is rapidly accumulated when prey are readily available (Saunders et al 2012). To the contrary, previous research has shown that the CEs of the Leeuwin Current generally exhibit oligotrophic oceanic conditions by global standards, whereas AEs have been classed as mesotrophic in nature (Waite et al 2007a, Waite et al 2007b. As a result, the AEs have consistently been found to be more biologically productive than are CEs, supporting significantly higher zooplankton biomass and more abundant mesozooplankton, which could be expected to provide much better feeding conditions for a generalist predator of zooplankton, such as phyllosomas.…”

Section: Comparison Between Ces or Aes Replicatesmentioning

confidence: 54%

“…Therefore, each eddy is sufficiently large and persistent to create a localised marine environment that is partially isolated from the surrounding subtropical surface waters. Each eddy develops its own distinctive food web, which very frequently includes entrapped phyllosomas of P. cygnus (Strzelecki et al 2007;Waite et al 2007a). …”

Section: Introductionmentioning

confidence: 99%

“…Studies of mesoscale eddies formed by the Leeuwin Current have consistently found that, within AEs, there is higher primary productivity that supports a greater biomass of zooplankton, than in CEs (Paterson et al 2007;Strzelecki et al 2007;Waite et al 2007aWaite et al , 2007b. The marked differences in the physical and biological conditions within an individual eddy could reduce the opportunities of phyllosomas to feed and accumulate sufficient nutrients to facilitate their subsequent migration and recruitment as pueruli into coastal waters.…”

Section: Introductionmentioning

confidence: 99%

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Condition of larvae of western rock lobster (Panulirus cygnus) in cyclonic and anticyclonic eddies of the Leeuwin Current off Western Australia

Wang

O’Rorke

Waite

et al. 2015

Mar. Freshwater Res.

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Abstract. Changes in the offshore oceanographic processes are suspected to be the cause of a recent dramatic decline in the settlement of post-larvae of the Western Australian spiny lobster (Panulirus cygnus), which has greatly reduced the productivity from the world's second-largest spiny lobster fishery. The present study assessed whether there are differences in the nutritional condition of the larvae of P. cygnus sampled from two pairs of cyclonic eddies (CEs) and anticyclonic eddies (AEs). Morphometric and biochemical analyses were undertaken on the mid-late-stage larvae (VI, VII, VIII) sampled offshore from two pairs of adjacent counter-rotating mesoscale eddies in the Leeuwin Current off Western Australia. The results showed that larvae captured from CEs had greater average total dry mass (P , 0.001) than those from AEs. Stage VIII larvae from CEs contained more protein (P , 0.008) (38.5% AE 5.4 s.e.) and lipid (P , 0.005) (67.2% AE 12.1) than did those from AEs. The possible causes for these differences are uncertain but may be related to differences in water temperatures in CEs v. AEs influencing the ability of phyllosomas to accumulate nutritional reserves.

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Section: Comparison Between Ces or Aes Replicatesmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Condition of larvae of western rock lobster (Panulirus cygnus) in cyclonic and anticyclonic eddies of the Leeuwin Current off Western Australia

Wang

O’Rorke

Waite

et al. 2015

Mar. Freshwater Res.

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“…Low oxygen zones are a feature of the Indian Ocean north-west of Australia (Stramma et al 2010;Thompson et al 2011b;Rossi et al 2013b) and may contribute to the anomalously high d 15 N values in WAM sediments at ,258S (e. g. Voss et al 2001) where the mean (AEs.d.) background isotopic composition of subeuphotic nitrate is typically 6.6 AE 0.7% (Waite et al 2007b(Waite et al , 2013. The d 15 N values of sinking fluxes are often equal to the isotopic composition of subeuphotic nitrate that is supplied to the euphotic zone by mixing or upwelling assuming nitrate is fully utilised (Galbraith et al 2008;Robinson et al 2012;Tesdal et al 2013).…”

Section: Organic Carbonmentioning

confidence: 99%

Baseline biogeochemical data from Australia's continental margin links seabed sediments to water column characteristics

Radke

Nicholas

Thompson

et al. 2017

Mar. Freshwater Res.

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Abstract. Surficial marine sediments are an important source of nutrients for productivity and biodiversity, yet the biogeochemistry of these sediments is poorly known in Australia. Seabed samples were collected at .350 locations in Australia's western, northern and eastern continental margins during Federal Government surveys . Parameters analysed included measures of organic matter (OM) source (d 13 C, d 15 N and C : N ratios), concentration (percentage total organic carbon, %TOC, and surface area-normalised TOC, OC : SA) and bioavailability (chlorin indices, total reactive chlorins, total oxygen uptake, total sediment metabolism (TSM), sediment oxygen demand (SOD) and SOD and TSM normalised against TOC). The aim of the present study was to summarise these biogeochemical 'baseline' data and make contextualised inferences about processes that govern the observed concentrations. The OM was primarily from marine sources and the OC : SA broadly reflected water column productivity (based on Moderate Resolution Imaging Spectroradiometer, MODIS). Approximately 40% of sediments were organic poor by global standards, reflecting seawater oligotrophy; ,12% were organic rich due to benthic production, high water column productivity and pockmark formation. OM freshness varied due to pigment degradation in water columns and dilution with refractory OM in reworked sediments. d 15 N values confirmed the importance of N 2 fixation to Timor Sea productivity, and point to recycling of fixed nitrogen within food chains in Western Australia.

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“…6). terms from the δ 15 N values: (i) for Group 1, where δ 15 N nitrate values were between −1 and 4 ‰, we estimated the percent of the nitrate signal attributable to nitrogen fixation, using a simple linear mixing model with two end points, assuming a δ 15 N = −1 ‰ for N-fixation (Montoya et al, 2002) and δ 15 N = 6.6 ‰ for deep nitrification (Waite et al, 2007a) (Fig. 8b).…”

Section: Primary Research Voyagementioning

confidence: 99%

Formation and maintenance of high-nitrate, low pH layers in the eastern Indian Ocean and the role of nitrogen fixation

et al. 2013

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We investigated the biogeochemistry of low dissolved oxygen high-nitrate (LDOHN) layers forming against the backdrop of several interleaving regional water masses in the eastern Indian Ocean, off northwest Australia adjacent to Ningaloo Reef. These water masses, including the forming Leeuwin Current, have been shown directly to impact the ecological function of Ningaloo Reef and other iconic coastal habitats downstream. Our results indicate that LDOHN layers are formed from multiple subduction events of the Eastern Gyral Current beneath the Leeuwin Current (LC); the LC originates from both the Indonesian Throughflow and tropical Indian Ocean. Density differences of up to 0.025 kg m⁻³ between the Eastern Gyral Current and the Leeuwin Current produce sharp gradients that can trap high concentrations of particles (measured as low transmission) along the density interfaces. The oxidation of the trapped particulate matter results in local depletion of dissolved oxygen and regeneration of dissolved nitrate (nitrification). We document an associated increase in total dissolved carbon dioxide, which lowers the seawater pH by 0.04 units. Based on isotopic measurements (δ¹⁵N and δ¹⁸O) of dissolved nitrate, we determine that ~ 40–100% of the nitrate found in LDOHN layers is likely to originate from nitrogen fixation, and that, regionally, the importance of N-fixation in contributing to LDOHN layers is likely to be highest at the surface and offshore

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Food web structure in two counter-rotating eddies based on δ15N and δ13C isotopic analyses

Cited by 90 publications

References 60 publications

Condition of larvae of western rock lobster (Panulirus cygnus) in cyclonic and anticyclonic eddies of the Leeuwin Current off Western Australia

Condition of larvae of western rock lobster (Panulirus cygnus) in cyclonic and anticyclonic eddies of the Leeuwin Current off Western Australia

Baseline biogeochemical data from Australia's continental margin links seabed sediments to water column characteristics

Formation and maintenance of high-nitrate, low pH layers in the eastern Indian Ocean and the role of nitrogen fixation

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