Poaching has indeed had a significant impact on the evolution of elephants, particularly by exerting strong selection pressure against tusks. Elephants with larger tusks are more likely to be targeted by poachers, as tusks are valuable in the illegal wildlife trade. This has led to a decrease in the frequency of large tusks in elephant populations over time.

As elephants with smaller tusks are more likely to survive and reproduce, the average tusk size in elephant populations has gradually declined. This evolutionary change has been documented in several African elephant populations, where tusklessness or reduced tusk size has become more common. In some areas, the proportion of tuskless elephants has increased from less than 1% to over 30% within a few decades.

The reduction in tusk size has consequences for elephant ecology and survival. Tusks are used for various purposes, including digging, gathering food, defense against predators, and social interactions. Smaller tusks can limit an elephant's ability to perform these tasks effectively, potentially affecting their survival and reproductive success.

Moreover, the loss of tusks can impact the social dynamics and structure of elephant populations. Tusks play a role in dominance hierarchies and are used in displays of strength and aggression. Reduced tusk size can disrupt these social interactions, leading to changes in group dynamics and reproductive behavior.

The ongoing poaching crisis and the associated selection against tusks pose a significant threat to the survival and well-being of elephant populations. Conservation efforts aimed at combating poaching and protecting elephant habitats are crucial to mitigate these impacts and ensure the long-term survival of these iconic species.