The cane toad, or rhinella marina, was introduced to the hawaiian islands in 1932 by sugar cane farmers. the farmers released the toads in their crops to control pests that were damaging the sugar cane. the cane toad has few natural predators because it secretes a poisonous toxin that kills the animals that consume it. as a result, the cane toad population thrived, and by 1935, it numbered hundreds of thousands. which role does the cane toad play in the hawaiian islands?

After being introduced into the Hawaiian Islands, the cane toads greatly affect local ecosystem. In the new area, they have a few natural predators and are able to spread. If they spread beyond the area they are introduced, they become invasive species which can overgrow native biotopes and are a great threat to the local biodiversity. This could lead to the extinction of some native species.

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measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.