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  1. Practical Biology
    https://practicalbiology.org/.../selection-in-action-banded-snails

    Selection in action – banded snails - practicalbiology.org

    • Distribute the sheets and discuss the data presented. If following the Evolution Megalab protocol, collect some snails to study in one lesson and practice using the keys in the lab (with the video for support), th… See more

    Health & Safety and Technical Notes

    If surveying snails in the wild, carry out a full risk assessment for outdoor work, and observe appropriate hygiene precautions after handling snails. See more

    Ethical Issues

    Teachers should be careful to introduce the snails in a way that promotes a good ethical attitude towards them and not a simply instrumental one. Although they are simple organisms which may not 'suffer' in the same way … See more

    Procedure

    Investigation aThink about the data about shell colour collected in different months at a particular thrush’s anvil in a wood near Oxford. bStudy the graph of percentages of yellow snails and of snails with one or more band, base… See more

    Teaching Notes

    Thrushes smash snails on particular stones (called ‘anvils’) to break open the shell and free the soft body of the snail to eat. Collecting snail shells from a thrush’s anvil makes it possible to find out the proportion of the differ… See more

    How do banded snails affect camouflage?
    Banded snails show significant variations. On the right are the first four snails that came to hand in a garden in Wales in October 2009. At least three selective pressures could act on this population. The colour and degree of banding has an influence on camouflage in different habitats.
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    Table of Contents
    Health & Safety and Technical Notes
    Ethical Issues
    Procedure
    Teaching Notes
    How do banded snails affect camouflage?
     

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  2. The case of banded snails – Cepaea nemoralis and Cepaea hortensis – is a well-known example of natural selection. The adaptation of populations of species of this snail in different environmental conditions is used as a case study for evolution in action.
    April: 42
    June: 22
    Month: Collected shells that were yellow (%)

    Selection in action – banded snails - practicalbiology.org

    practicalbiology.org/evolution/modelling-natural-selection/selection-in-action-bande…
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  3. People also ask
    Are banded snails an example of natural selection?
    The case of banded snails – Cepaea nemoralis and Cepaea hortensis – is a well-known example of natural selection. The adaptation of populations of species of this snail in different environmental conditions is used as a case study for evolution in action.

    Selection in action – banded snails - practicalbiology.org

    practicalbiology.org
    What is a banded snail survey?
    This project is co-ordinating a survey of banded snails in the UK. It provides background information about the snails, video to show how to collect and identify the snails in your area, keys to allow accurate identification of different varieties of Cepaea, and record sheets on which to collect your findings.

    Selection in action – banded snails - practicalbiology.org

    practicalbiology.org
    How do banded snails affect camouflage?
    Banded snails show significant variations. On the right are the first four snails that came to hand in a garden in Wales in October 2009. At least three selective pressures could act on this population. The colour and degree of banding has an influence on camouflage in different habitats.

    Selection in action – banded snails - practicalbiology.org

    practicalbiology.org
    What is the difference between banded and unbanded snails?
    Unbanded snails are the reference For both yellow, and in particular, pink snails, an increase in the number of dry days in general reduces the probability of a banded versus an unbanded shell.

    Snail shell colour evolution in urban heat islands detected ... - Nature

    nature.com
    Are unbanded snails more likely to be brown?
    Similarly, as previously reported Cain et al. 1960, epistasis meant that unbanded snails (O) were generally more likely to be brown, and banded snails (B) were less likely to be brown.

    Discrete or indiscrete? Redefining the colour polymorphism of the land

    nature.com
    Did you misclassify a snail?
    Furthermore, in several cases probably we were the ones to misclassify a snail. Mainly due to the variation within each of the three main colour categories, assigning a colour to a snail is not always straightforward. This is especially true for people who are not experienced with studying Cepaea.

    Snail shell colour evolution in urban heat islands detected ... - Nature

    nature.com
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  4. ScienceDaily
    https://www.sciencedaily.com/releases/2011/04/110427171511.htm

    Evolution in the back yard: Census of 750,000 banded snails …

     
  5. Nature
    https://www.nature.com/articles/hdy201677

    What explains rare and conspicuous colours in a snail? A test of …

  6. Nature
    https://www.nature.com/articles/s42003-019-0511-6

    Snail shell colour evolution in urban heat islands detected

  7. Nature
    https://www.nature.com/articles/s41437-019-0189-z

    Discrete or indiscrete? Redefining the colour polymorphism of the …

  8. Phys.org
    https://phys.org/news/2011-04-evolution-yard-census-banded.pdf
    [PDF]

    Evolution in the back yard -- census of 750,000 banded …

  9. royalsocietypublishing.org
    https://royalsocietypublishing.org/doi/10.1098/rstb.2020.0156

    Whole-genome re-sequencing data to infer historical demography …

  10. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3186227

    Thirty-four years of climatic selection in the land snail

  11. Oxford Academic
    https://academic.oup.com/biolinnean/article/108/3/484/2415578

    Selection and disequilibrium in Cepaea nemoralis

  12. Nature
    https://www.nature.com/articles/s41437-023-00648-z

    Fine mapping of the Cepaea nemoralis shell colour and mid …

  13. Discover Magazine
    https://www.discovermagazine.com/planet-earth/...

    Crowdsourced Project Shows Some Snail Shells Lightening in …

  14. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6629550

    Discrete or indiscrete? Redefining the colour polymorphism of the …

  15. Oxford Academic
    https://academic.oup.com/biolinnean/article/129/2/323/5650668

    Disruptive selection of shell colour in land snails: a …

  16. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5176118

    What explains rare and conspicuous colours in a snail? A test of …

  17. Wiley Online Library
    https://onlinelibrary.wiley.com/doi/full/10.1002/ece3.7517

    Quantitative measures and 3D shell models reveal interactions …

  18. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3669759

    Rapid, habitat-related evolution of land snail colour morphs on ...

  19. Carbon Brief
    https://www.carbonbrief.org/climate-change-and-the...

    Climate change and the extinction of the Aldabran banded snail

  20. Nonindigenous Aquatic Species
    https://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=1047

    banded mysterysnail (Viviparus georgianus) - Species Profile

  21. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3083392

    Citizen Science Reveals Unexpected Continental-Scale …

  22. Bailey-Matthews National Shell Museum
    https://www.shellmuseum.org/post/2015/10/30/the-banded-tulip

    The Banded Tulip - shellmuseum

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