GALAPAGOS ADAPTATIONS

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Presentation transcript:

GALAPAGOS ADAPTATIONS The Marine Iguana A RESOURCE BROUGHT TO YOU BY THE GALAPAGOS CONSERVATION TRUST (REGISTERED CHARITY NO. 1043470) GALAPAGOSCONSERVATION.ORG.UK

ALL ABOUT VARIATION A RESOURCE BROUGHT TO YOU BY THE GALAPAGOS CONSERVATION TRUST (REGISTERED CHARITY NO. 1043470) GALAPAGOSCONSERVATION.ORG.UK

What is variation? When we are thinking about variation in animals it refers to the differences that occur between members of the same species. There are two types of variation – continuous and discontinuous. Continuous variation is variation that does not have a limit on the value or measurement that can occur in a population. Here are some examples – Height Heart rate Length of ears Discontinuous variation is variation that has separate groups that species will belong to. Here are some examples – Blood group Tongue rolling Finger prints © pixababay.com A RESOURCE BROUGHT TO YOU BY THE GALAPAGOS CONSERVATION TRUST (REGISTERED CHARITY NO. 1043470) GALAPAGOSCONSERVATION.ORG.UK

Discuss your reasoning with the class. Look at the following examples of continuous and discontinuous variation for the marine iguana. With a learning partner decide which type of variation it is - CONTINUOUS or DISCONTINUOUS? Discuss your reasoning with the class. Eye colour Gender Weight Tail length Number of spines Length of claws © from top left clockwise - David Nelson, others Vanessa Horwell A RESOURCE BROUGHT TO YOU BY THE GALAPAGOS CONSERVATION TRUST (REGISTERED CHARITY NO. 1043470) GALAPAGOSCONSERVATION.ORG.UK

Are you ready for more? Within species some variation is inherited and some is due to environmental conditions. An inherited variation is the result of genetic information passed on from parents. In humans examples of inherited variation may be skin or hair colour. An environmental variation may be caused by factors such as climate, diet and habitat. For example, species of plants that prefer a warmer climate may grow to be bigger and healthier in a warmer country compared to one with a cooler climate. Let us think about the marine iguana. Which variations are inherited, which are due to the environment? A RESOURCE BROUGHT TO YOU BY THE GALAPAGOS CONSERVATION TRUST (REGISTERED CHARITY NO. 1043470) GALAPAGOSCONSERVATION.ORG.UK

An excellent example of how the environment can influence variation is shown in ‘The Case of the Shrinking Dragons’. Read about how variations in the environmental conditions can lead to changes in the actual body length of some of the iguanas! © Vanessa Horwell A RESOURCE BROUGHT TO YOU BY THE GALAPAGOS CONSERVATION TRUST (REGISTERED CHARITY NO. 1043470) GALAPAGOSCONSERVATION.ORG.UK