Which factor does NOT contribute to the population dynamics of vectors?

The factor that does not contribute to the population dynamics of vectors is the restriction to "weather patterns only." While weather patterns can influence vector populations, it is a broader set of factors encompassing temperature, humidity, and availability of breeding sites that more directly affect these dynamics.

Temperature plays a crucial role in the development and survival of vector species. For instance, certain vectors may thrive in warm conditions, while extreme temperatures could lead to higher mortality rates. Humidity, similarly, impacts the life cycle and behavior of vectors, particularly those that rely on moisture for breeding or survival. The availability of breeding sites is another essential factor as it directly influences where vectors can reproduce and how populations grow.

By narrowing the choice to "weather patterns only," it disregards the significant contributions of these other factors. Thus, understanding the comprehensive interplay of temperature, humidity, and breeding site availability is key in vector population dynamics.