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Light Intensity Lab Report

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The initial objective of our study was to determine how light intensity affects the speed of the Cepaea nemoralis.. In both trial 1 and trial 2, when C. nemoralis was exposed to an environment of higher light intensity, their speed of movement was much faster than when the snails were in an area of lower light intensity. The results from both trial 1 and trial 2 were consistent with our prediction that the speed of C. nemoralis would increase as the light intensity increased. Light intensity was predicted to cause an increase in speed in C. nemoralis because as snails are slow moving individuals, light draws snails to be more vulnerable and susceptible to virtual predators such as mice and frogs (Cook 2008). Due to this, C. nemoralis attempts to avoid this exposition by moving faster towards an area of refuge (Cook 2008). Light intensity also was expected to cause an increase in snail speed because the natural habitat of snails is shaded, causing snails to migrate faster towards an area of darkness (Cameron 2001). …show more content…
By referring to figures 1 and 2 attached, it was observed that the average speed for the higher light intensity treatment was nearly double that of the average speed for the dark treatment in both trials 1 and trial 2. When C. nemoralis is exposed to higher degrees of heat, it’s metabolic functions increase as well (Cameron 2001). This increase in metabolic functions could contribute to an additional increase in speed, along with increase in speed that is caused due to the light intensity. This means that heat could have been a source of variation that caused the snail’s speed to be faster than if it were isolated from the heat emitted by the lamp, being a possible reason for why such large average speed difference was observed between the light and dark

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