Pyruvate Oxidoreductases Involved in Glycolytic Anaerobic Metabolism of Polychaetes from the Continental Shelf off Central-South Chile

González, Rodrigo R.; Quiñones, Renato A.

doi:10.1006/ecss.2000.0693

Cited by 53 publications

(37 citation statements)

References 36 publications

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“…nov. is an unusually large species for the deep sea. However, similarly large polychaetes are found within the food-rich, albeit shallower, Chilean OMZ (González & Quiñones 2000). González & Quiñones (2000) showed that polychaetes inhabiting hypoxic/anoxic environments have more than 1 pyruvate oxidoreductase enzyme, which is utilized in anaerobic metabolism.…”

Section: Discussionmentioning

confidence: 99%

“…However, similarly large polychaetes are found within the food-rich, albeit shallower, Chilean OMZ (González & Quiñones 2000). González & Quiñones (2000) showed that polychaetes inhabiting hypoxic/anoxic environments have more than 1 pyruvate oxidoreductase enzyme, which is utilized in anaerobic metabolism. Furthermore those authors demonstrated a positive allometric relationship with anaerobic metabolism (utilizing pyruvate oxidoreductase enzymes) in polychaetes inhabiting hypoxic sediments at the Chilean margin.…”

Section: Discussionmentioning

confidence: 99%

“…Exceptions are the detailed studies of the pelagic copepod Lucicutia grandis by Wishner et al (2000), the Humboldt squid Dosidicus gigas by Rosa & Seibel (2010), the benthic mud-ball forming cirratulid Monticellina sp. by Levin & Edesa (1997) and the spionid Paraprionospio pinnata by González & Quiñones (2000). Responses to the physiological constraints of OMZs have also been documented in several species of calanoid copepods via ontogenetic zonation (Wishner et al 2000, Loick et al 2005, Criales-Hernandez et al 2008.…”

Section: Introductionmentioning

confidence: 96%

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Living on the edge: single-species dominance at the Pakistan oxygen minimum zone boundary

Jeffreys

Levin

Lamont³

et al. 2012

Mar. Ecol. Prog. Ser.

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Oxygen minimum zones (OMZs) are naturally occurring, low-oxygen water masses that create hypoxic conditions where they impinge on the seafloor. Their lower boundaries are characterised by elevated densities of hypoxia-tolerant fauna and an abundant food supply. The polychaete Linopherus sp. nov. (Amphinomidae) is the dominant taxon at the Pakistan margin (PM) lower OMZ, at near suboxic dissolved oxygen (DO) concentrations of 5 to 8 µM. We explored the response of Linopherus sp. nov. to gradients in oxygen and organic matter (OM) availability from depths of 700 to 1100 m during the inter-and late monsoon periods. Linopherus sp. nov. was present from 800 to 1000 m, and highest densities were found at 850 m. Population size structuring was evident and smaller individuals were present at depths of lowest DO concentrations. Linopherus sp. nov. showed morphological adaptation to low DO, and respiratory surface areas were significantly larger in worms at sites of lowest DO concentrations.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Living on the edge: single-species dominance at the Pakistan oxygen minimum zone boundary

Jeffreys

Levin

Lamont³

et al. 2012

Mar. Ecol. Prog. Ser.

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“…These conditions are generated by high oxygen consumption due to the decomposition of organic matter and slow rates of water renewal by ventilation 48) . The OMZ is an important physical barrier to aerobic respiration 15) , making oxygen levels a critical factor for the pelagic biota 4,20,21,30,47) . The sampling area is characterized by upwelling and a semi-permanent subsurface OMZ related to the Equatorial Subsurface Waters (ESSW) that are transported poleward by the Gunther Current 5,68) (Fig.…”

Section: Site Sampling and Hydrographic Measurementsmentioning

confidence: 99%

Methylotrophic Methanogens in the Water Column of an Upwelling Zone with a Strong Oxygen Gradient Off Central Chile

et al. 2007

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The growing biogeochemical and economic importance of biogenic methane contained in gas hydrates necessitates a better understanding of the microorganisms involved in the last phase of organic matter degradation. Here, the distribution and relative abundance of methylotrophic methane-producing Archaea (mMPA) were studied in an upwelling area off central Chile by rRNA dot blot hybridization. The mMPA were detected mostly during active upwelling periods, and were more abundant in the deeper layer of the water column (>50 m), where they represented ~10% of the prokaryote rRNA extractable from seawater samples in the oxygen minimum zone (OMZ). Significant correlations were found between the concentration of rRNA from mMPA and (i) nitrate concentration (r=−0.54, p=0.0392) and (ii) temperature (r=−0.51, p=0.0267). Enrichment experiments with water samples from the OMZ were carried out to evaluate the cellular viability of mMPA. These experiments showed that some of these Archaea remain viable in the planktonic environment although not essentially associated with fecal pellets or any type of compact macroaggregate. The results suggest that mMPA in the water column come mostly from sediment and that a fraction correspond to psychrophilic varieties of facultative methylotrophs.

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“…Polychaetes possess diverse adaptations for maintaining aerobic respiration, including ventilation behavior and respiratory pigments for oxygen storage and transport (Kristensen, 1983;Grieshaber et al, 1994;Burnett and Stickle, 2001;Wu, 2002;Riedel et al, 2016). Conversely, an oxyconforming strategy entails metabolic depression comprising various gene regulation and molecular mechanisms (Wu, 2002), reduced feeding, and the onset of anaerobic metabolism (Gonzalez and Quionones, 2000;Burnett and Stickle, 2001;Wu, 2002). Critical oxygen concentrations specify physiological thresholds (P crit ), below which the aerobic demands of resting metabolism cannot be maintained (Kersey Sturdivant et al, 2015), and thus where respiration strategies shift from oxyregulating to oxyconforming (Herreid, 1980).…”

Section: Discussionmentioning

confidence: 99%

Temperature-Modulated Expression of Allometric Respiration Strategies Supports a Metabolic Scaling Rule

Rakocinski

Gillam

2017

Front. Mar. Sci.

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A model based on the mass-specific oxygen consumption rate of the tolerant polychaete, Capitella telata, related meaningfully to a novel metabolic scaling rule as applied to the infaunal size spectrum. Depending on temperature, C. telata expressed divergent oxyregulating or oxyconforming strategies relative to oxygen availability. A non-linear response surface fitted to the allometric exponents of a family of V O2 curves for 12 treatment combinations of DO saturation and temperature was used to project oxygen consumption rates across the infaunal size spectrum. Plasticity in respiration strategies was evident, based on four simulated dynamic 32 d oxygen-temperature exposure scenarios and on simulated static oxygen-temperature exposures. The oxyconforming strategy of C. telata expressed under hypoxia near the upper thermal limit agreed with a hypothesized allometric scaling rule based on metabolic ecology. Conversely, an oxyregulating respiration strategy was expressed at cooler temperatures under low oxygen concentration, except organisms hyper-regulated relative to normoxic conditions. At warm temperatures, small organisms exhibited relatively greater metabolic depression than large organisms; whereas at cool temperatures, small organisms hyper-regulated relatively more than large organisms. Dichotomous shifts in respiration strategies likely reflect a breakdown in the functioning of special adaptations, and reliance on alternative coping mechanisms. Divergent temperature-dependent respiration strategies illustrate how responses to multiple stressors can be synergistic. Moreover, results imply that population responses to hypoxia may differ, depending on prevailing temperature regimes.

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Pyruvate Oxidoreductases Involved in Glycolytic Anaerobic Metabolism of Polychaetes from the Continental Shelf off Central-South Chile

Cited by 53 publications

References 36 publications

Living on the edge: single-species dominance at the Pakistan oxygen minimum zone boundary

Living on the edge: single-species dominance at the Pakistan oxygen minimum zone boundary

Methylotrophic Methanogens in the Water Column of an Upwelling Zone with a Strong Oxygen Gradient Off Central Chile

Temperature-Modulated Expression of Allometric Respiration Strategies Supports a Metabolic Scaling Rule

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