Climate change and the arrival of self-introduced bird species in New Zealand
|Title||Climate change and the arrival of self-introduced bird species in New Zealand|
|Publication Type||Journal Article|
|Year of Publication||2007|
|Authors||Neuhauser, M, Cuming, P|
|Type of Article||article|
|Keywords||global warming, New Zealand, self-introduced birds|
New Zealand average atmospheric temperatures showed little increase from the 1850s onwards for almost 100 years, but increased rapidly after c. 1940. The increase in temperatures was accompanied, at least in parts of New Zealand, by an increase in precipitation,. We investigated the relationship between the arrival years (1st breeding) of the bird species that self-introduced to New Zealand during the 20th century and the period of turpentine increase. Because these birds come from Australia the warming might be a prerequisite to colonize New Zealand. When considering the 1st breeding years as events in a univariate point process the process is non-stationary and the rate function has its estimated maximum in 1953. This estimate may indicate that the sequence of invasions of New Zealand by additional bird species could be a response to climate changes although the coincidence is on its own not sufficient to prove that climate changes have affected the self-introduction of birds from Australia into New Zealand. Alternative and additional explanations are discussed.