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Related Concept Videos

Migration00:53

Migration

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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Precipitation and Co-precipitation01:17

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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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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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Responses to Drought and Flooding02:41

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Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
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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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Precipitation Gravimetry01:03

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
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Rainfall Patterns and U.S. Migration from Rural Mexico.

Lori M Hunter1, Sheena Murray2, Fernando Riosmena3

  • 1Department of Sociology, CU Population Center, Institute of Behavioral Science, University of Colorado at Boulder, lorimaehunter@comcast.net.

The International Migration Review
|December 5, 2014
PubMed
Summary
This summary is machine-generated.

Climate change impacts rural livelihoods, driving migration. Drought increases U.S. migration from Mexican communities with established migration networks, but not from those without.

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Area of Science:

  • Environmental Science
  • Sociology
  • Economics

Background:

  • Rural communities in developing countries often depend on natural resources, making them vulnerable to climate change.
  • Climate-induced livelihood constraints can lead to migration as an adaptive strategy.
  • Understanding the interplay of climate, community, and migration is crucial for policy development.

Purpose of the Study:

  • To model U.S. emigration from rural Mexican communities.
  • To investigate the relationship between climate factors, community characteristics, household data, and migration decisions.
  • To identify how social networks influence migration as a response to climate variability.

Main Methods:

  • Utilized data from the Mexican Migration Project.
  • Employed statistical modeling to analyze community, household, and climate factors influencing U.S. emigration.
  • Examined the role of migration history and social networks in mediating climate impacts on migration.

Main Results:

  • Recent drought conditions significantly increase the likelihood of U.S. migration from communities with strong migration histories.
  • In communities lacking established migration networks, rainfall deficits were found to decrease migration propensity.
  • This suggests that social infrastructure is a key determinant in migration as a climate adaptation strategy.

Conclusions:

  • Climate change, particularly drought, is a significant driver of international migration from rural Mexico.
  • The effectiveness of migration as an adaptation strategy is contingent on existing community migration networks.
  • Policy recommendations include diversifying rural livelihoods to build resilience against climate change impacts.