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Because we will all eventually get round to it. (Y)
Right. Thought I'd be productive (keeno). I watched the Evolution in Action podcast about the weird Svalbard reindeer that inhabit the Norwegian islands of..erm..Svalbard. Duh. The physical and behavioural changes displayed in the types of reindeer that have moved away from the others shows evolution in action. The difference in physicality stands out most. As the reindeer have moved to different and more isolated conditions, they have adapted to increase their chances of survival. For example, their coat changes to suit the climate by becoming longer and thicker. The reindeer then breed, passing on these advantages alleles to their offspring, and this increases their chance of survival in the different environment to the other types of reindeer. This environment is also isolated from predators, also increasing chances of survival and successful breeding. So yeah. Speciation for the win. :]
Parts of Northern Noway geographical isolation occured. The abiotic conditions changed which put the Reindeers under direct selective environmental pressure. The geographical isolation occured through sea levels rising at the north pole. Of course this is because of global warming due to the excessive amount of carbon dioxide within the atmostphere... I don't need to explain the process in which sea levels rise do I?
Acers of the land have been cut off due to flooding on the plains. This caused some reindeers to become geographical isolated.
As a result of this there has been a reduction in the genepool due to low numbers of species avaliable for reproduction. The species now need to undergo an adaptation to better there likelihood of surviving the new abiotic condtions. Due to this pressure the genepool under goes a change which ensures the advantageous alleles are expressed in the phenotype and the reindeer has a better chance of survival. Now the genepool has changed and are no longer avaliable to breed with the orignal set of species to produce fertile offspring. This is speciation and the development of a new species of reindeer.
only reindeer to live above 75 degree latitude due to migration. due to low numbers of predators in svalbard the reindeer go around in small groups. because of this they dont have large numbers of paracites, they dont need to migrate because their area always has food and they usually live longer. becuase of no predatory threats they have short heads with their eyes in the middle of the head unlike the norway reindeer which has predatory threats has a long head with eyes at the top of their head so that when they grase they can see when predators come also the norway reindeer live in large hurds so paracites are common and thrive.
in svalbard the main cause of death is starvation due to heavy snow and ice cover that cover the land. so in the summer momnths they eat loads to get fat so they can wait the winter out if needed . bacuase of their big fur coats and short stubby legs the reindeer can only run about 100M or so before they start to over heat.
These evolved in forests similar to the forests of Northern Europe and Canada.
How are they adapted to the cold climate?
They have thick bushy fur which insulates their warm bodies from the cold in the winter. They also have broad, flat feet which help them walk in the snow. In winter they use their strong, broad forefeet to dig through the snow to reach the vegetation beneath. In the winter there is a lot of social interaction as all the reindeers work alongside each other to find food.
They eat several species of lichen. Towards the end of winter or when then snow is deep, hungry reindeer also eat less nutritious black lichen. In the summer they eat almost any plants available.
who has actually managed to get the podcasts? If not, why haven't you emailed/spoken to me so I can help fix the problem? Let me know people.
why is Will not on the forum and where are his notes?
Cuz he isn't keen?
Speciation has occured in the poles of the Ice caps E.g. Reindeer have been seperated due to Geographical Isolation, in this case a natural barrier. When a species seperate they move away from their original habitat in which case the Environment will also take a slight change or considerable one. If they have advantagous alleles they will for example in this case grow Longer hair and so stay warmer this will give them more chance of survival in their harsh condition. Food their can be scarce when snow is heavy and the build up of ice may keep the food source just out of reach, So reindeer have hooves in which they kick at the ground as a shovel to remove heavy snow. Their teeth are also adapted for eating vegetation but their teeth age can be as low as 14 years and so they do not die at optimim body age but Molar age because keratin is worn down. Some are adapted to run very fast because even in harsh conditions their are Predators, these reindeer can run very fast but only for short distances while a diffrent type of reindeer cannot really run because of lack of predators.
Hurrah. We have evidence of the Will on the forum area. There was me worrying that he was geographically isolated.