A new study on octopus DNA has yielded valuable insights into the disappearance of the western Arctic ice sheet and its implications for rising sea levels. The research focused on the genetic history of the Turquet octopus and confirmed that the last collapse of the ice sheet occurred over 100,000 years ago, during the last interglacial period. This discovery has important implications for understanding future sea level rise in a warming climate.
The study’s lead author, Sally Lau, describes the project as a “fresh perspective” on a long-standing question in the geological research community. By sequencing the DNA of 96 Turquet octopuses, the research team was able to construct detailed genealogical trees dating back millions of years. Genetic analysis provided information on the interbreeding of different octopus populations and revealed a genetic connection between populations about 125,000 years ago, which aligns with the collapse of the western Arctic ice sheet.
Another author of the study, Jan Strugnell, emphasizes the significance of the western Arctic ice sheet as a major contributor to global sea level rise. A complete collapse of the ice sheet could cause a sea level rise of 3 to 5 meters. Understanding the configuration of the ice sheet in the past, during similar global temperatures, will aid in better predicting future sea level rise.
The Turquet octopus was selected for the study due to its relatively sedentary nature, which increases the likelihood of breeding within genetically distinct local populations. Additionally, this species has well-studied biology, making it suitable for precise molecular dating.
This study represents a significant step forward in understanding the history and future implications of the collapse of the western Arctic ice sheet. By utilizing genetic analysis of octopuses, researchers have shed light on a complex geological process and its potential impact on our planet.
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