Rats followed us all over the world, but where are they from?
Executive Summary
Brown rats are believed to have originated in Northeast Asia, with their global spread largely facilitated by maritime trade routes, particularly during the 18th century.
Studying the historical dispersal of rats is challenging due to their burrowing nature, but new techniques like ZooMS and the analysis of shipwreck remains are providing clearer insights.
Rats exhibit rapid adaptation to urban environments, with evidence showing changes in diet (more protein), metabolism, and even skull morphology in city-dwelling populations.
Due to their rapid reproduction, adaptability, and the effects of climate change, brown rat populations are expected to become an even more significant feature of urban ecosystems in the future.
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Concerns Raised
The difficulty of accurately dating archaeological rat remains due to their burrowing behavior.
The potential for rat populations to become a larger problem in cities due to climate change.
Current pest control methods can be ineffective and have negative secondary effects on other species.
Opportunities Identified
Using new scientific methods like ZooMS and isotope analysis to better understand rat biology and dispersal.
Applying knowledge of rat biology and behavior to design more effective and humane management strategies.
Studying urban rats as a model for rapid evolution and adaptation in human-altered environments.