Populations of blue-winged warblers, a type of bird, migrate south in the winter and return to Canadian breeding grounds in the spring. As global temperatures have increased due to climate change, spring has started arriving in the warbler's breeding grounds earlier in the year, before the warblers return. Warblers now arrive at their breeding grounds too late to select ideal nesting sites and to feed on important early-spring food sources.

Populations will decline.

Explanation:

Since individuals will be less likely to successfully reproduce, and because they will not be able to breed with other birds on the breeding grounds.

Hopefully this helps :)

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