Why Do Some Species Adapt to Climate Change While Others Don't?

Jul 25

3 min read

Phoenix, AZ

Split landscape: leafy green tree under blue-pink sky on grass, and bare black tree over golden desert-like sunset. — Nature's two sides: growing and fading.

Imagine waking up one day to find your home disappearing, food becoming harder to find, and the environment around you changing faster than you can adjust. That’s what so many species face as climate change continues to change the planet [1]. However, not every animal responds the same way: some adjust quickly, while others struggle to survive. Understanding why some species adapt to climate change while others struggle helps explain the challenges it introduces for life on Earth [2].

Monarch butterfly perched on white daisies with yellow centers against a blurred green garden background. — Butterfly resting on daisies.

Some species have an easier time adapting to environmental changes because they reproduce faster than others and, therefore, have more generations in a shorter period of time. More generations create more chances for new and more useful traits to develop. These traits come from random changes in an organism’s genes, called mutations. Most mutations don’t help, but every so often, one happens to be useful, and the animals that carry it are more likely to survive and pass it on to the next generation. On the other hand, species with slower reproduction rates have fewer generations, leading to less time to adjust. For example, insects adapt much quicker than larger animals with longer life cycles, because they reproduce faster and can develop beneficial traits at a faster rate [2]. Still, adaptation isn’t only about speed, since where a species lives can also play a major role in their survival.

Adult polar bear and cub walk across snowy sea ice under a gray sky. — Polar bears on icy terrain.

Some species can survive in a variety of habitats, while others rely on very specific environments. As a result, the species that can adapt to different habitats often have an advantage and a greater chance of survival. But surviving in a new habitat isn’t only about whether an animal can physically live there. It also depends on things like whether its usual food sources are still available and whether they suddenly face new predators or competition. An animal might be able to tolerate a new environment, but if the prey that it relies on disappears, survival becomes much harder. Meanwhile, if an animal depends on just one type of environment, even small changes to it can cause some major challenges. Take polar bears, for example. While raccoons can live in forests, cities, and the suburbs, polar bears can only depend on the Arctic sea ice for survival. As climate change causes this ice to melt, polar bears have fewer places to live, making it harder for them to survive and adapt [3]. To make things worse, polar bears mainly hunt seals, and seals rely on that same vanishing ice too, so the loss of ice takes away both their home and their main food source at once.

In conclusion, species respond to climate change in very different ways depending on many factors such as reproduction speed and habitat tolerance. Some are able to adapt quickly and survive, while others struggle because they cannot adjust in response as effectively. These differences show how complex the impact of climate change is on wildlife. Because of this, conservation organizations and nonprofits are already stepping in to help. Groups like the World Wildlife Fund and Polar Bears International work to protect vulnerable habitats, track how animals are responding to a warmer and warmer earth, and push for policies that reduce the effects of climate change. Their efforts show that while the challenge is real, there are meaningful ways that people can help wildlife adapt. In today’s world where climate change is already reshaping entire ecosystems, this understanding becomes more important than ever [1].