Elemental Stoichiometry of Species in Ecosystems

1995 ◽  
pp. 240-252 ◽  
Author(s):  
Robert W. Sterner
Keyword(s):  
Elemental Stoichiometry

Plantations modified leaf elemental stoichiometry compared to the native shrub community in karst areas, Southwest of China

Trees ◽  
2021 ◽  
Author(s):  
Jiahao Wen ◽  
Huimin Tao ◽  
Baoming Du ◽  
Dafeng Hui ◽  
Ningxiao Sun ◽  
...  
Keyword(s):  
Shrub Community ◽  
Elemental Stoichiometry ◽  
Karst Areas

scholarly journals One-step electrodeposition of ligand-free PdPt alloy nanoparticles from water droplets: Controlling size, coverage, and elemental stoichiometry

2019 ◽  
Vol 98 ◽  
pp. 1-5 ◽  
Author(s):  
Andrew D. Pendergast ◽  
Matthew W. Glasscott ◽  
Christophe Renault ◽  
Jeffrey E. Dick
Keyword(s):  
Alloy Nanoparticles ◽  
Water Droplets ◽  
Elemental Stoichiometry ◽  
Ligand Free ◽  
One Step

scholarly journals Extreme Levels of Ocean Acidification Restructure the Plankton Community and Biogeochemistry of a Temperate Coastal Ecosystem: A Mesocosm Study

2021 ◽  
Vol 7 ◽  
Author(s):  
Carsten Spisla ◽  
Jan Taucher ◽  
Lennart T. Bach ◽  
Mathias Haunost ◽  
Tim Boxhammer ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Fish Larvae ◽  
Plankton Community ◽  
Trophic Levels ◽  
Coastal Regions ◽  
Mesozooplankton Community ◽  
Planktonic Food ◽  
Elemental Stoichiometry ◽  
Secondary Consumers ◽  
Induced Changes

The oceans’ uptake of anthropogenic carbon dioxide (CO2) decreases seawater pH and alters the inorganic carbon speciation – summarized in the term ocean acidification (OA). Already today, coastal regions experience episodic pH events during which surface layer pH drops below values projected for the surface ocean at the end of the century. Future OA is expected to further enhance the intensity of these coastal extreme pH events. To evaluate the influence of such episodic OA events in coastal regions, we deployed eight pelagic mesocosms for 53 days in Raunefjord, Norway, and enclosed 56–61 m3 of local seawater containing a natural plankton community under nutrient limited post-bloom conditions. Four mesocosms were enriched with CO2 to simulate extreme pCO2 levels of 1978 – 2069 μatm while the other four served as untreated controls. Here, we present results from multivariate analyses on OA-induced changes in the phyto-, micro-, and mesozooplankton community structure. Pronounced differences in the plankton community emerged early in the experiment, and were amplified by enhanced top-down control throughout the study period. The plankton groups responding most profoundly to high CO2 conditions were cyanobacteria (negative), chlorophyceae (negative), auto- and heterotrophic microzooplankton (negative), and a variety of mesozooplanktonic taxa, including copepoda (mixed), appendicularia (positive), hydrozoa (positive), fish larvae (positive), and gastropoda (negative). The restructuring of the community coincided with significant changes in the concentration and elemental stoichiometry of particulate organic matter. Results imply that extreme CO2 events can lead to a substantial reorganization of the planktonic food web, affecting multiple trophic levels from phytoplankton to primary and secondary consumers.

scholarly journals Element budgets in an Arctic mesocosm CO<sub>2</sub> perturbation study

2012 ◽  
Vol 9 (8) ◽  
pp. 11885-11924 ◽  
Author(s):  
J. Czerny ◽  
K. G. Schulz ◽  
T. Boxhammer ◽  
R. G. J. Bellerby ◽  
J. Büdenbender ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Ocean Acidification ◽  
Nutrient Dynamics ◽  
Temporal Dynamics ◽  
Nitrogen And Phosphorus ◽  
Nutrient Pools ◽  
Dissolved Organics ◽  
Elemental Stoichiometry ◽  
Element Budgets ◽  
Wall Growth

Abstract. Recent studies on the impacts of ocean acidification on pelagic communities have identified changes in carbon to nutrient dynamics with related shifts in elemental stoichiometry. In principle, mesocosm experiments provide the opportunity of determining the temporal dynamics of all relevant carbon and nutrient pools and, thus, calculating elemental budgets. In practice, attempts to budget mesocosm enclosures are often hampered by uncertainties in some of the measured pools and fluxes, in particular due to uncertainties in constraining air/sea gas exchange, particle sinking, and wall growth. In an Arctic mesocosm study on ocean acidification using KOSMOS (Kiel Off-Shore Mesocosms for future Ocean Simulation) all relevant element pools and fluxes of carbon, nitrogen and phosphorus were measured, using an improved experimental design intended to narrow down some of the mentioned uncertainties. Water column concentrations of particulate and dissolved organic and inorganic constituents were determined daily. New approaches for quantitative estimates of material sinking to the bottom of the mesocosms and gas exchange in 48 h temporal resolution, as well as estimates of wall growth were developed to close the gaps in element budgets. Future elevated pCO2 was found to enhance net autotrophic community carbon uptake in 2 of the 3 experimental phases but did not significantly affect particle elemental composition. Enhanced carbon consumption appears to result in accumulation of dissolved organic compounds under nutrient recycling summer conditions. This carbon over-consumption effect becomes evident from budget calculations, but was too small to be resolved by direct measurements of dissolved organics. The out-competing of large diatoms by comparatively small algae in nutrient uptake caused reduced production rates under future ocean CO2 conditions in the end of the experiment. This CO2 induced shift away from diatoms towards smaller phytoplankton and enhanced cycling of dissolved organics was pushing the system towards a retention type food chain with overall negative effects on export potential.

Irradiance and the elemental stoichiometry of marine phytoplankton

2006 ◽  
Vol 51 (6) ◽  
pp. 2690-2701 ◽  
Author(s):  
Z. V. Finkel ◽  
A. Quigg ◽  
J. A. Raven ◽  
J. R. Reinfelder ◽  
O. E. Schofield ◽  
...  
Keyword(s):  
Marine Phytoplankton ◽  
Elemental Stoichiometry

On the mechanistic foundation and limit of Liebig’s law of the minimum

2021 ◽  
Author(s):  
Jinyun Tang ◽  
William Riley
Keyword(s):  
Additive Model ◽  
Additive Models ◽  
Mass Action ◽  
Substrate Uptake ◽  
Law Of Mass Action ◽  
Growth Data ◽  
Biological Growth ◽  
Elemental Stoichiometry ◽  
The Law ◽  
Parameter Values

&lt;p&gt;In ecosystem biogeochemistry, Liebig&amp;#8217;s law of the minimum (LLM) is one of the most widely used rules to model and interpret biological growth. Although it is intuitively accepted as being true, its mechanistic foundation has never been clearly presented. We here first show that LLM can be derived from the law of mass action, the state of art theory for modeling biogeochemical reactions. We further show that there are (at least) another two approximations (the synthesizing unit (SU) model and additive model) that are more accurate than LLM in approximating the law of mass action. We then evaluated the LLM, SU, and additive models against growth data of algae and plants. For algae growth, we found all three models are equally accurate, albeit with different parameter values. For plants, LLM failed to accurately model one dataset, and achieved equally good results for other datasets with very different parameters. We also find that LLM does not allow flexible elemental stoichiometry, which is an oft-observed characteristic of plants, when an organism&amp;#8217;s growth is modeled as a function of substrate uptake flux. In summary, we caution the use of LLM for modeling biological growth if one is interested in representing the organisms&amp;#8217; capability in adapting to different nutrient conditions.&amp;#160;&amp;#160;&amp;#160;&lt;/p&gt; &lt;p&gt;&lt;br /&gt;&lt;br /&gt;&lt;/p&gt;

scholarly journals Flexible elemental stoichiometry in Trichodesmium spp. and its ecological implications

2006 ◽  
Vol 51 (4) ◽  
pp. 1777-1790 ◽  
Author(s):  
Angelicque E. White ◽  
Yvette H. Spitz ◽  
David M. Karl ◽  
Ricardo M. Letelier
Keyword(s):  
Elemental Stoichiometry ◽  
Ecological Implications

Elemental stoichiometry of freshwater fishes in relation to phylogeny, allometry and ecology

2007 ◽  
Vol 70 (1) ◽  
pp. 121-140 ◽  
Author(s):  
H. A. Hendrixson ◽  
R. W. Sterner ◽  
A. D. Kay
Keyword(s):  
Freshwater Fishes ◽  
Elemental Stoichiometry

scholarly journals A Mechanistic Model of Macromolecular Allocation, Elemental Stoichiometry, and Growth Rate in Phytoplankton

2020 ◽  
Vol 11 ◽  
Author(s):  
Keisuke Inomura ◽  
Anne Willem Omta ◽  
David Talmy ◽  
Jason Bragg ◽  
Curtis Deutsch ◽  
...  
Keyword(s):  
Growth Rate ◽  
Mechanistic Model ◽  
Elemental Stoichiometry
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