The urban monkeys of New Delhi are so brave they will be Stolen lunch Straight off your plate. If you’ve spent time in New York, you’ve probably seen it Squirrels try to do the same. Sydney’s white ibises have earned the nickname “bean chickenFor stealing trash and sandwiches.
This brazen behavior is not normal for most species in the countryside, yet it can be seen in urban wildlife, and not just in these cities.
Research shows that animals living in urban environments around the world Display common set of behaviors. At the same time, these urban animals are losing the characteristics they need in the wild. This process of urban animals becoming more similar in behavior is known as “behavioral homogenization” and is with loss of species diversity With urbanization.
we study Animals in Urban settings To understand how humans can help wildlife thrive in an urbanizing world. In a new study, we explore Causes and long-term consequences This behavior changes for urban wildlife.
What makes the animals similar in the city?
Cities, despite their local differences, share many of the same characteristics globally: they are warmer, noisier, more light-polluted than the surrounding countryside and, most importantly, dominated by humans.
Squirrels of New York, Monkey of New Delhi, Gulls in UK coastal towns And other urban wildlife has learned that humans are a food source. And since people don’t usually harm animals, animals living in cities learn not to fear people.
Cities also drive evolution. The changes we’ve brought to people and cities have led to the survival of brave animals, and those brave animals pass their traits on to future generations. In genetics, scientists refer to the environment as “selection” for these traits.
It’s not just sandwich theft that’s rampant among the city’s wildlife; Urban birds sound more of the same.
Why? Cities are loud and crowded Traffic noiseSo those who can communicate effectively in that environment are more likely to survive and pass on those traits.
As can urban birds sing loudlystart singing before morning or at higher frequency Avoid being drowned out by low frequency traffic noise.
Select for city Smart individuals and species Because that’s what it takes to survive.
Animals in cities may behave similarly because they learn from each other how to exploit novel human food sources. For example, Cockatoos in Sydney Learned to open the trash bin. In Toronto, Raccoon Urban wildlife managers are racing to outdo humans as they try to design animal-proof trash bins.
The buildings and bridges of the city have become houses the bat, the birdand other urban dwellers, at the expense of learning to use more natural nesting sites. Roads and culverts Modify how and where animals move.
While rural animals can graze in different places and eat a variety of foods, urban animals can concentrate Garbage pits or garbage heaps Where they know they can find food, but they end up eating a potentially unhealthy food.
Consequences for similar behavior
Loss of behavioral diversity is occurring everywhere in humans Increase their footprint in nature. This is worrying on several levels.
At the population level, behavioral variation may reflect genetic variation. Genetic diversity gives species the ability to respond to future environmental changes. For example, for animals that evolved to breed at a specific time of year, Urban heat islands may select for earlier reproduction.
Decreased genetic diversity makes populations less able to respond to future changes. In that sense, having genetic diversity is similar to a diversified investment portfolio: spreading risk across a variety of stocks and bonds reduces the risk that a single shock will wipe out everything.
Furthermore, when animals become tamer, new conflicts between animals and humans may arise. For example, more car accidents, animal bites, property damage may occur and zoonotic disease transmission. Such collisions cost money and can cause harm to both animals and humans.
Loss of behavioral diversity is also problematic for conservation.
When a species loses behavioral diversity, it loses resilience against future environmental changes in the wild, making it difficult for urban animals to reacquaint themselves with the wild.
Loss of behavioral diversity results in socially learned, population-specific behaviors, such as local migration routes, foraging strategies, tool-use traditions, or Vocal dialect.
Like Australia Regent Hunter Populations have declined and are critically endangered. The isolation of having fewer of their own species around has disrupted normal song-learning behavior, making it difficult for male birds to sing the catchy songs that help them. Find mates and breed successfully.
Finally, behavioral homogenization is causing wildlife in cities like Los Angeles, Lima, Lagos, and Lahore to behave similarly despite living in different environments and having different evolutionary histories.
Many of these behaviors affect survival and reproduction, so understanding this form of diversity loss is important for successful wildlife conservation as well as future urban planning.
Daniel T. BlumsteinProfessor of Ecology and Evolutionary Biology, Institute of Environment and Sustainability, University of California, Los Angeles; Peter MikulaPostdoctoral researcher in the Faculty of Environmental Sciences and Piotr TrajanowskiProfessor of Zoology Department
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