Squids Across the Ocean

In a recent study done by the University of Copenhagen, researchers extracted DNA from various giant squid samples and compared them. They found very little difference in the DNA they examined; leading them to believe that there is only one species of giant squid. Previous to this study, the number of species was assumed to be anywhere between one and twenty one. The reason for the assumption was that there are many diverse forms, and they can be found anywhere except the poles.

To gather their data, the researchers took DNA from squids that had been found washed up on beaches, inside the stomachs of whales, and accidentally caught by fishing boats. In total, they extracted DNA from forty-three squids. The DNA they analyzed was mDNA, or mitochondrial DNA, which is inherited from the maternal line.

Upon studying this DNA, they noticed that there were many similarities. In fact, the samples that were taken showed that the giant squids were twenty times less genetically diverse than the other squid populations found in the area. More than being the same species, the results also led the researchers to believe that each squid was a part of one global population instead of smaller groups that only interact with each other.

NOS Themes

·         Science is based on evidence: They believe that the giant squids are all one species due to the similarities in the DNA

·         Importance of repeatability: They are continuing to do further research on this topic to determine if the results are consistent throughout

·         Role of chance: Another reason they are continuing their research is to make sure these similarities aren’t just a genetic fluke

·         Role of motivation and curiosity: Very little is known about the giant squid, and these scientists were motivated to find out more

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