Are there any positives from climate change, including benefits for animals?

Thanks for asking about whether there are positives from climate change.  What a great question!  Climate change is posing real challenges for people and for nature but not everything is negative everywhere.  The most obvious changes in nature include our findings that plants and animals are moving into areas where those particular species have not been before.  This is because areas further away from the equator are becoming warmer and allowing tropical and subtropical animals to move into temperate areas, and those in temperate areas to move into polar areas. In fact, polar regions in the Arctic and Antarctica are “greening” with the arrival of larger plants. 

A good example of animal arrivals in Tasmania is that Yellowtail Kingfish can be caught off the east coast of Tasmania throughout more of the year than in the past.  A citizen science project, Redmap, lets fishers log their unusual catches so that scientists can find out about these species on the move! Also, over the last 20 years, the long spine (dark blue/black) sea urchin has arrived from southern New South Wales to become very important in rocky reef systems around Tasmania.  These changes have occurred because climate change is causing changes in ocean circulation and the East Australia Current has been penetrating Tasmanian waters further and for longer throughout the year than in the past.   

Understanding whether these changes in distribution of animals and plants is a good thing or not depends on the effects those species have in their new environment.  For example, Yellowtail Kingfish live in open water parts of the ocean that have a specific temperature range.  Moving to a new open water place does not change much for the tuna or the life around it.  However, the sea urchins for example live on the sea floor and are moving into areas where there are other species that already live there.  These other species, like abalone or rock lobster, are negatively affected by the urchin as the urchin devours large amounts of algae and causes change in the rocky reef habitat.   

How can a sea urchin move from New South Wales to Tasmania if it lives on the sea floor?  Most animals and plants in the ocean have two phases in their life cycle – a larval phase (like a tadpole) and the adult phase.  Sea urchin larvae can survive in the surface of the ocean for many weeks before they settle to the sea floor.  So, larvae from sea urchins in NSW can travel on the East Australia Current and then settle in Tasmania.

You could read more about how species are responding to climate change here: https://theconversation.com/climate-driven-species-on-the-move-are-changing-almost-everything-74752