In 1953 the collared dove had never been in the United Kingdom. Why does the growth of the collared dove flatten out in 1971

May be climate change, introduction of invasive species and unavailability of food etc.

Explanation:

The growth of the collared dove flatten out in 1971 because of many reasons such as climate change, introduction of invasive species and unavailability of food etc. Climate change is the main problem that affect the growth of every organisms across the globe. The changing of temperature of the world causes migration in the collard dove to other suitable regions which leads to decrease in the population of the dove. Invasive species also decreases the population through feeding on them or competition for resources.

it depends on how much it could carry.