The Permo-Triassic Analysis
2014). Other key characteristic features that may have enabled dinosaurs to benefit from the ecological crises would include: high thermal inertia, exceptional growth rate, and efficient (avian-like) respiratory systems (Benton et al. 2014). Furthermore, the supposedly mammalian-like endothermy and their upright, bipedal posture are other potential examples of adaptive advantages (Benton et al. 2014). These factors enabled the dinosaurs to undergo adaptive radiation following the Permo-Triassic mass extinction.
The Cretaceous/ Tertiary (K/T) boundary is associated with the mass extinction of dinosaurs, a geological event that dates back approximately 65 million years (Brisman et al. 2001). The extinction of dinosaurs is commonly attributed to a large bolide impacting the Earth and a massive series of volcanic eruptions at the end of the Cretaceous period (Brisman et al. 2001). Either of these proposed hypotheses could account for the short-term (rapid) cooling, cessation of photosynthesis, acid rain and extensive wildfires that ultimately led …show more content…
For example, non-avian dinosaurs became extinct following the asteroid impact, yet birds survived (Kukuchi and Vanneste 2010). The impact of ground-level ozone with respect to varying survival rates among dinosaurs had hardly been considered since the K-T impact theory was reported. More recently, however, reverse trajectory models actually predicted an ozone concentration above the health-threatening level that persisted near the ground after the K-T impact (Kukuchi and Vanneste 2010). Due to potential respiratory ozone irritation, non-avian dinosaurs likely experienced significantly lower survival probability compared to avian dinosaurs (Kukuchi and Vanneste