What might happen to biodiversity in area 1 if the new bird species moved into the area

New bird species may alter the ecosystem and modify the trophic chain when they become invasive, leading consequently to the loss of biodiversity

Explanation:

Invasive (also known as alien) species are non-native species capable of spreading into a new area where they have a drastic impact on the ecosystem. An invasive species may cause an important loss of biodiversity and modify the food web in an ecosystem by replacing native species. Examples of invasive bird species include the house sparrow, European starling, cattle egret, rock pigeon, etc. Nonetheless, it is important to highlight that not necessarily new bird species will become invasive (it will depend on their effects on the ecosystem).

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

that is wrong, its not thymus.