Final answer:
Turner and Trexler found a positive relationship between egg size and survival in North American darter populations, implying that larger eggs may offer a developmental advantage for the offspring in river and stream environments.
Step-by-step explanation:
Turner and Trexler found a positive relationship between egg size and survival in the darter populations that live in rivers and streams of North America. This relationship suggests that larger eggs may confer a survival advantage to the offspring in these environments, possibly due to the increased nutrients and energy reserves available to the developing embryo.
When studying the dynamics of fish populations, such as those in freshwater ecosystems, it is essential to understand factors like egg size which can impact the viability and sustainability of the species in their natural habitat.