the warm and dry summer in the taiga biome would negatively impact the plants and animals as they rely on the cool and wet conditions for growth and survival, potentially leading to decreased productivity, habitat loss, and competition for limited resources.

In different words

The hot and arid summer in the taiga biome would have a detrimental effect on the flora and fauna that depend on the cool and moist conditions for their growth and survival. This could result in reduced productivity, loss of habitat, and increased competition for limited resources.