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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Adaptations that Reduce Water Loss01:57

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Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Types of Coprecipitation01:10

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Ecological Disturbance02:26

Ecological Disturbance

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An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
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Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
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JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
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Ecotypic Identity and Manipulated Rainfall Modulate Diversity-Productivity Relationships Across a Precipitation

Zhe Ren1,2,3, David J Gibson3, David F Barfknecht3,4

  • 1Department of Biological and Clinical Sciences University of Central Missouri Warrensburg Missouri USA.

Ecology and Evolution
|April 13, 2026
PubMed
Summary

Local grass ecotypes and biomass significantly impact grassland diversity and productivity, especially in dry conditions. Site context and local adaptation are crucial for restoration success.

Keywords:
Andropogon gerardi VitmanUS Great Plainsecotypegeneralized boosted regression treesgeneralized linear mixed modeltallgrass prairie

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Area of Science:

  • Ecology
  • Community Ecology
  • Ecosystem Function

Background:

  • Diversity-productivity relationships are key to understanding ecosystem stability and predicting responses to environmental change.
  • Local adaptation and site-specific factors can modulate these relationships, influencing community structure and function.
  • Grassland ecosystems face increasing pressure from altered precipitation patterns and land use, necessitating research into their resilience.

Purpose of the Study:

  • To investigate how local ecotypes of dominant grasses and experimental drought influence diversity-productivity relationships across a rainfall gradient.
  • To determine the relative importance of aboveground biomass, seed source, and rainfall manipulation in shaping grassland diversity (species richness, phylogenetic diversity, functional diversity).
  • To assess the role of local adaptation and site context in mediating the effects of environmental factors on grassland communities.

Main Methods:

  • A reciprocal common garden experiment was established across a rainfall gradient (500–1200 mm yr-1) in the US Great Plains.
  • Generalized linear mixed models and generalized boosted regression trees were used to analyze the effects of aboveground biomass, seed source, and rainfall manipulation on grassland diversity metrics.
  • Experimental drought was simulated using rainout shelters to manipulate water availability.

Main Results:

  • Aboveground live biomass was the strongest predictor of grassland diversity across all sites.
  • Functional diversity was positively correlated with aboveground live biomass at the dry site.
  • Dominant species ecotypes influenced diversity-productivity relationships in a site-specific manner; for example, the DRY ecotype reduced species richness with increasing biomass at driest and mesic sites.

Conclusions:

  • Dominant species attributes, particularly local adaptation of ecotypes, play a central role in shaping diversity-productivity relationships.
  • Site context and local adaptation are critical considerations for effective grassland restoration and biodiversity-function research.
  • While rainfall manipulation had weaker effects, aboveground biomass emerged as a consistent driver of grassland diversity, underscoring the importance of plant traits.