Trionyx muticus is abundant in the Kansas River, especially in sandy habitats. Egg-laying occurs chiefly in June and July and a female may produce two or more clutches per season. Clutches found in nests averaged 12.6 eggs. Nests averaged 38.2 m from the water and 1.34 m above the water level, and the average depth to the eggs was 16.2 cm. Eggs are approximately spherical, with a mean maximum diameter of 22.9 mm and a mean weight of 6.72 g. Hatchlings, emerging in late August and September, have an average carapace length of 34.84 mm and average weight of 4.91 g. By mid-June of the following year the hatchling cohort has gained 36% in length and 95% in weight. A crude estimate of population structure is made from the analysis of tracks left by basking turtles.
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Fitch et al. (2013) studied this question.
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