The extinction of dinosaurs created conditions that allowed fruit to reach its maximum potential, influencing the evolution of plant life.
In the spirit of “everything is connected,” a new study found that the extinction of the dinosaurs paved the way for the emergence of fruit, which nourished our primate ancestors. Tapping into this pattern could help humans not go extinct.
Though they varied in size, dinosaurs were massive beasts that impacted their environment just like humans do. In a new study from Northern Arizona University, researchers delved into the relationship between their extinction and the evolution of fruit. They explored a few key moments in the planet’s history surrounding the absence of its biggest consumers, which directly impacted the size and development of fruit-bearing seeds.While it was previously suggested that the dinosaur extinction led to a darker forest subcanopy benefiting large-seeded plants, the study authors created a model replicating tropical forest conditions from 66 million years ago to confirm this theory.The absence of the gigantic creatures helped create the conditions for fruit to reach maximum potential, so researchers might have identified a key ingredient in the evolutionary process.Five extinction events show that smaller animals=more fruitThe new study opened by outlining the world’s five mass extinction events and the sixth we’re currently going through, illustrating the significance of this research. During these environmental shifts, smaller animals replaced larger ones that directly shaped their environment due to their sheer size. Little evidence exists to support this theory, so the researchers recreated the conditions in an individual-based model to explore the “long-term interactions” between seed size, animal size, and the understory light environment. They described dinosaurs as “ecosystem engineers’ that can impact forest structure. Their massive size and need to nourish themselves directly translated to the loss of trees and vegetation, discouraging the emergence of larger seeds as fruit was sparse during their reign on earth. But once they went extinct about 65 million years ago, the absence of gigantic beasts incentivized trees to grow, which shaded the ground so that larger fruits could thrive in a world where the animals helped distribute the seeds, helping plant life spread. Thirty-five million years ago, seeds gradually diminished in size because land animals had reached a size themselves, and they began to impact their surroundings, forests specifically, thus the fruiting seeds. However, researchers stated in the press release that “the evolutionary pressure for seed size to increase” began to decrease as “larger seeds were no longer successful over smaller ones.” Researchers could then “explain the trends in seed size over time without resorting to external influences such as climate change.”Lastly, about 50,000 years ago, the planet experienced another mass extinction, this time involving the loss of prehistoric beasts such as mammoths. Once again, as ecosystem engineers, their disappearance marked another period of seed growth. And now, humans have stepped up as the main ecosystem engineer. Will humans go extinct or learn from this environmental pattern? “Evidence is mounting,” study authors write, “that many ecosystems were more open, light-rich, and disturbance-adapted before humans took over the landscapes, and mega-herbivores remain a prime candidate as a main disturbance agent.”According to their study, they emphasize that “the importance of including large herbivore-driven ecological dynamics into models to correctly understand long-term processes leading to our current vegetation structure and composition.”Over the past 50,000 years, animal sizes have decreased again, harking back to the dinosaur era, so their model suggests that these ecological dynamics will continue to repeat themselves. Humans have become the main “ecosystem engineers” today, putting substantial pressure on the environment.“It’s clearly extremely speculative to predict human behavior into the distant future,” study authors conclude, but the results of their research seem to suggest that we’ll either see human extinction or long-term sustainable extraction of resources. If humans understand this pattern, we may be able to cultivate, if not regenerate, large-seeded fruits.As an interesting angle on environmental history, “the next time you’re eating fruit and pondering ‘why am I here?’ Consider the impact of dinosaur extinction,” the authors stated.The study has been published in Palaeontology.
Dinosaur Extinction Fruits Paleontology Primates Seeds
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