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44 results for “Oxygen limitation”
Data from: Oxygen limited thermal tolerance is seen in a plastron breathing insect, and can be induced in a bimodal gas exchanger
<p>Dataset on respiration and ctmax in two freshwater bugs, associated with the paper:<br> <strong>Verberk WCEP & Bilton DT (2015) </strong>Oxygen limited thermal tolerance is seen in a plastron breathing insect, and can be induced in a bimodal gas exchanger. <em>Journal of Experimental Biology </em>218: 2083-2088. doi: 10.1242/jeb.119560</p>
"LARVAL FISH HABITATS AND DEOXYGENATION IN THE NORTHERN LIMIT OF THE OXYGEN MINIMUM ZONE OFF MEXICO"
<p>Dataset associated with the submitted publication - "LARVAL FISH HABITATS AND DEOXYGENATION IN THE NORTHERN LIMIT OF THE OXYGEN MINIMUM ZONE OFF MEXICO"</p> <p>Created: 10/10/2019 by Victor M. Godínez (CICESE). Ver. 1.0</p> <p>Authors: Laura Sánchez-Velasco, Victor M. Godínez, Erick D. Ruvalcaba-Aroche, Amaru Márquez-Artavia, Emilio Beier, Eric D. Barton and S. Patricia A. Jiménez-Rosenberg.<br> Project_info: This data base has been obtained during the project funded by the financial support of SEP-CONACyT (contracts 2014-236864, L. Sanchez-Velasco) and Fronteras de la Ciencia-CONACyT (contracts 2015-2-280, L. Sanchez-Velasco).<br> License: The authors appreciate that users of these data: 1) Contact Laura Sánchez-Velasco (lsvelasc@gmail.com) to follow the uses of the data, and 2) Include the requested acknowledgment (cite using the DOI of this dataset) in any presentations or publications.</p> <p>Variables:<br> five structures for the four surveys (Survey_Feb2010, Survey_Apr2012, Survey_Jun2015, Survey_Mar2016, Survey_Oct2017) with the following variables:<br> Name Units<br> ___________ ________<br> 'Latitude' 'degrees'<br> 'Longitude' 'degrees'<br> 'XX' 'Distance (km)'<br> 'YY' 'Distance (m)'<br> 'Pressure' 'decibars'<br> 'Temperature' 'conservative temperature (oC)' <br> 'Salinity' 'Absolute Salinity (g/Kg)'<br> 'Oxigen' 'dissolved oxygen (mL/L)'<br> 'Fluorescence' '(mg/m^3)'<br> 'xlar' 'Distance (km)' <br> 'ylar' 'Distance (m)'<br> 'Bb' 'Bregmaceros bathymaster (Larvae/10m^2)'<br> 'Bp' 'Benthosema panamense (Larvae/10m^2)'<br> 'Dl' 'Diogenichthys laternatus (Larvae/10m^2)'<br> 'Asp' 'Auxis spp (Larvae/10m^2)'</p> <p><br> One structures for the oldest data with the following variables:<br> Name Units<br> ___________ ________<br> 'Latitude' 'degrees'<br> 'Longitude' 'degrees'<br> 'Time' 'absolute julian day'<br> 'Pressure' 'decibars'<br> 'Temperature' 'conservative temperature (oC)' <br> 'Salinity' 'Absolute Salinity (g/Kg)'<br> 'Oxigen' 'dissolved oxygen (mL/L)</p>
Carbon decomposition data from oxygen-limited soils
To understand carbon (C) decomposition under cyclic, time-varying oxygen (O2) fluctuations, we incubated two disparate soils (Oxisol and Mollisol) under five fluctuating oxygen treatments (0, 2, 4, 8, or 12 days of anoxic conditions followed by 4 days of oxic conditions), and measured C decomposition as CO2 and CH4 (and their stable isotope compostion) at 2–4-day measurement timesteps for 384 days. We also used a process-based mechanistic model to test C decomposition in response to O2 fluctuations. This dataset supports the findings described in the associated manuscript by Huang et al. (2021).
Data from: eDNA-stimulated cell dispersion from Caulobacter crescentus biofilms upon oxygen limitation is dependent on a toxin-antitoxin system
<p><span>In their natural environment, most bacteria preferentially live as complex surface-attached multicellular colonies called biofilms. Biofilms begin with a few cells adhering to a surface, where they multiply to form a mature colony. When conditions deteriorate, cells can leave the biofilm. This dispersion is thought to be an important process that modifies the overall biofilm architecture and that promotes colonization of new environments. In <em>Caulobacter crescentus</em> biofilms, extracellular DNA (eDNA) is released upon cell death and prevents newborn cells from joining the established biofilm. Thus, eDNA promotes the dispersal of newborn cells and the subsequent colonization of new environments. These observations suggest that eDNA is a cue for sensing detrimental environmental conditions in the biofilm. Here we show that </span><span>the toxin-antitoxin system (TAS) <em>ParDE<sub>4</sub></em> stimulates cell death in areas of a biofilm with decreased O<sub>2</sub> availability. In conditions where O<sub>2</sub> availability is low, eDNA concentration is correlated with cell death. Cell dispersal away from biofilms is decreased when <em>parDE<sub>4</sub></em> is deleted, probably due to the lower local eDNA concentration. Expression of <em>parDE<sub>4</sub></em> is positively regulated by O<sub>2</sub> and the expression of this operon is decreased in biofilms where O<sub>2</sub> availability is low. Thus, a programmed cell death mechanism using an O<sub>2</sub>-regulated TAS stimulates dispersal away from areas of a biofilm with decreased O<sub>2</sub> availability and favors colonization of a new, more hospitable environment. </span></p>
Generated data for "Limited ventilation of the central Baltic Sea due to elevated oxygen consumption" paper
<p>This data are essential for reproducing the figures from Naumov et al. "Limited ventilation of the central Baltic Sea due to elevated oxygen consumption" paper. Each archive is named after one of the ten figures and includes the data necessary for that specific figure. Some data are used in more than one figure. In some cases, performing a particular type of analysis with the given data (linear regression, for instance) is necessary to fully reproduce the figure.</p>
Data from: eDNA-stimulated cell dispersion from Caulobacter crescentus biofilms upon oxygen limitation is dependent on a toxin-antitoxin system
Open the record for dataset details and reuse information.
Data from: Oxygen limitations on marine animal distributions and the collapse of epibenthic community structure during shoaling hypoxia
Deoxygenation in the global ocean is predicted to induce ecosystem-wide changes. Analysis of multidecadal oxygen time-series projects the northeast Pacific to be a current and future hot spot of oxygen loss. However, the response of marine communities to deoxygenation is unresolved due to the lack of applicable data on component species. We repeated the same benthic transect (n = 10, between 45 and 190 m depths) over 8 years in a seasonally hypoxic fjord using remotely operated vehicles equipped with oxygen sensors to establish the lower oxygen levels at which 26 common epibenthic species can occur in the wild. By timing our surveys to shoaling hypoxia events, we show that fish and crustacean populations persist even in severe hypoxia (<0.5 mL L−1) with no mortality effects but that migration of mobile species occurs. Consequently, the immediate response to hypoxia expansion is the collapse of community structure; normally partitioned distributions of resident species coalesced and localized densities increased. After oxygen renewal and formation of steep oxygen gradients, former ranges re-established. High frequency data from the nearby VENUS subsea observatory show the average oxygen level at our site declined by ~0.05 mL L−1 year−1 over the period of our study. The increased annual duration of the hypoxic (<1.4 mL L−1) and severely hypoxic periods appears to reflect the oxygen dynamics demonstrated in offshore source waters and the adjacent Strait of Georgia. Should the current trajectory of oxygen loss continue, community homogenization and reduced suitable habitat may become the dominant state of epibenthic systems in the northeast Pacific. In situ oxygen occurrences were not congruent with lethal and sublethal hypoxia thresholds calculated across the literature for major taxonomic groups indicating that research biases toward laboratory studies on Atlantic species are not globally applicable. Region-specific hypoxia thresholds are necessary to predict future impacts of deoxygenation on marine biodiversity.
Data from: Temperature-dependent oxygen limitation and the rise of Bergmann's Rule in species with aquatic respiration
Bergmann's Rule is the propensity for species-mean body size to decrease with increasing temperature. Temperature-dependent oxygen limitation has been hypothesized to help drive temperature–size relationships among ectotherms, including Bergmann's Rule, where organisms reduce body size under warm oxygen-limited conditions, thereby maintaining aerobic scope. Temperature-dependent oxygen limitation should be most pronounced among aquatic ectotherms that cannot breathe aerially, as oxygen solubility in water decreases with increasing temperature. We use phylogenetically-explicit analyses to show that species-mean adult size of aquatic salamanders with branchial or cutaneous oxygen uptake becomes small in warm environments and large in cool environments, whereas body size of aquatic species with lungs (i.e., that respire aerially), as well as size of semi aquatic and terrestrial species do not decrease with temperature. We argue that oxygen limitation drives the evolution of small size in warm aquatic environments for species with aquatic respiration. More broadly, the stronger decline in size with temperature observed in aquatic vs terrestrial salamander species mirrors the relatively strong plastic declines in size observed previously among aquatic vs terrestrial invertebrates, suggesting that temperature-dependent oxygen availability can help drive patterns of plasticity, micro- and macroevolution.
Oxygen supply limits the heat tolerance of avian embryos
<p>Physiologists have primarily focused on two potential explanations for heat stress in animals—the classic model of molecular stability and a more recent model of oxygen limitation. Although the classic model has widespread support, the oxygen-supply model applies to many aquatic animals and some terrestrial ones. In particular, the embryonic stage of terrestrial animals seems most susceptible to oxygen limitation because embryos acquire oxygen from the atmosphere by diffusion rather than ventilation. We report experiments confirming the two conditions of the oxygen-supply model in Japanese quail embryos, Coturnix coturnix. Hypoxia (12% O2) greatly reduced the chance of survival at 47.5°C, and hyperoxia greatly improved the chance of survival at 48.5°C. This finding expands the scope of the oxygen-supply model to a terrestrial, endothermic species, suggesting that oxygen supply generally limits the heat tolerance of embryos.</p>
Data from: Thermal limits in native and alien freshwater peracarid Crustacea: the role of habitat use and oxygen limitation
1. In order to predict which species can successfully cope with global warming and how other environmental stressors modulate their vulnerability to climate related environmental factors, an understanding of the ecophysiology underpinning thermal limits is essential for both conservation biology a nd invasion biology. 2. Heat tolerance and the extent to which heat tolerance differed with oxygen availability were examined for four native and four alien freshwater peracarid crustacean species, with differences in habitat use across species. Three hypotheses were tested: 1) Heat and lack of oxygen synergistically reduce survival of species; 2) Patterns in heat tolerance and the modulation thereof by oxygen differs between alien and native species, and between species with different habitat use; 3) small animals can better tolerate heat than large animals and this difference is more pronounced under hypoxia. 3. To assess heat tolerances under different oxygen levels, animal survival was monitored in experimental chambers in which the water temperature was ramped up (0.25 ˚C min-1). Heat tolerance (CTmax) was scored as the cessation of all pleopod movement, and heating trials were performed under hypoxia (5kPa Oxygen), normoxia (20 kPa) and hyperoxia (60 kPa). 4. Heat tolerance differed across species as did the extent by which heat tolerance was affected by oxygen conditions. Heat tolerant species, e.g., Asellus aquaticus and Crangonyx pseudogracilis, showed little response to oxygen conditions in their CTmax, whereas the CTmax of heat sensitive species, e.g., Dikerogammarus villosus and Gammarus fossarum, was more plastic, being increased by hyperoxia and reduced by hypoxia. 5. In contrast to other studies on crustaceans, alien species were not more heat tolerant than native species. Instead, differences in heat tolerance were best explained by habitat use, with species from standing waters being heat tolerant and species from running waters being heat sensitive. In addition, larger animals displayed lower CTmax, but only under hypoxia. An analysis of data available in the literature on metabolic responses of the study species to temperature and oxygen conditions suggests that oxygen conformers and species whose oxygen demand rapidly increases with temperature (low activation energy) may be more heat sensitive. 6. The alien species D. villosus appeared most susceptible to hypoxia and heat stress. This may explain why this species is very successful in colonizing new areas in littoral zones with rocky substrate which are well aerated due to continuous wave action generated by passing ships or prevailing winds. This species is less capable of spreading to other waters which are poorly oxygenated and where C. pseudogracilis is the more likely dominant alien species.
Blend to Limit Oxygen in ECMO: A Randomised Controlled Registry Trial
ClinicalTrials.gov study NCT03841084. IPD Sharing: NO. Countries: 1. Publications: 3.
Trial of a Limited Versus Traditional Oxygen Strategy During Resuscitation in Premature Newborns
ClinicalTrials.gov study NCT01697904. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Data from: Oxygen supply limits the heat tolerance of lizard embryos
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Data from: Oxygen limitations on marine animal distributions and the collapse of epibenthic community structure during shoaling hypoxia
Open the record for dataset details and reuse information.
Data from: Temperature-dependent oxygen limitation and the rise of Bergmann’s Rule in species with aquatic respiration
Open the record for dataset details and reuse information.
Data from: Oxygen limitation at the larval stage and the evolution of maternal investment per offspring in aquatic environments
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Oxygen supply limits the heat tolerance of avian embryos
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Data from: Thermal limits in native and alien freshwater peracarid Crustacea: the role of habitat use and oxygen limitation
Open the record for dataset details and reuse information.
Data from: Limited oxygen availability in utero may constrain the evolution of live-birth in reptiles
Although viviparity (live birth) has evolved from oviparity (egg laying) at least 140 times in vertebrates, nearly 120 of these independent events occurred within a single reptile taxon. Surprisingly, only squamate reptiles (lizards and snakes) are capable of facilitating embryonic development to increasingly advanced stages inside the mother during extended periods of oviducal egg retention. Viviparity has never evolved in turtle lineages, presumably because embryos enter and remain in an arrested state until after eggs are laid, regardless of the duration of egg retention. Until now, the limiting factor that initiates and maintains developmental arrest has remained elusive. Here, we show that oviducal hypoxia arrests embryonic development. We demonstrate that hypoxia can maintain developmental arrest after oviposition and that subsequent exposure of arrested embryos to normoxia triggers resumption of their development. We discovered remarkably low oxygen partial pressure in the oviducts of gravid turtles and found that secretions produced by the oviduct retard oxygen diffusion. Our results suggest that an extremely hypoxic environment in the oviduct arrests embryonic development and may constrain the evolution of viviparity in turtles, with the reduced diffusive capacity of oviducal secretions possibly creating or contributing to this hypoxia. We anticipate that these findings will allow us to better understand the mechanisms underlying the evolutionary transition between reproductive modes.
Data from: Oxygen limitation is not the cause of death during lethal heat exposure in an insect
Oxygen- and capacity-limited thermal tolerance (OCLTT) is a controversial hypothesis claiming to explain variation in, and mechanistically determine, animal thermal limits. The lack of support from Insecta is typically argued to be a consequence of their high-performance respiratory systems. However, no studies have reported internal body oxygen levels during thermal ramping so it is unclear if changes in ambient gas are partially or fully offset by a compensatory respiratory system. Here we provide such an assessment by simultaneously recording haemolymph oxygen (pO2) levels – as an approximation of tissue oxygenation - while experimentally manipulating ambient oxygen and subjecting organisms to thermal extremes in a series of thermolimit respirometry experiments using pupae of the butterfly Pieris napi. The main results are that while P. napi undergo large changes in haemolymph pO2 that are positively correlated with experimental oxygen levels, haemolymph pO2 is similar pre- and post-death during thermal assays. OCLTT predicts that reduction in body oxygen level should lead to a reduction in CTmax. Despite finding the former, there was no change in CTmax across a wide range of body oxygen levels. Thus, we argue that oxygen availability is not a functional determinant of the upper thermal limits in pupae of P. napi.
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