# Ancient Dinosaurs Foraged on Seaweed Washed Ashore, Study Finds

Dinosaurs living along North American coasts 75 million years ago supplemented their diets with marine vegetation that storms deposited on beaches, according to research published in Frontiers in Ecology and Evolution. The discovery comes from analysis of fossilized teeth that reveal a feeding behavior previously unknown to paleontologists.

The research examines marine subsidization, a process where storms and tidal action transport ocean material onto land, creating nutritional resources for terrestrial animals. Today this phenomenon sustains coastal wildlife during periods of scarcity, particularly when droughts reduce the availability of typical food sources. The new study extends this understanding backward in time, suggesting dinosaurs relied on similar mechanisms nearly 80 million years ago.

Fossilized teeth provide the primary evidence for this dietary behavior. Different wear patterns and chemical compositions in dental remains indicate which organisms consumed marine resources. The teeth examined in this study show evidence consistent with consumption of seaweed and other ocean-derived organic matter, suggesting at least some dinosaur species actively foraged along beaches and tide zones.

This finding reshapes current understanding of dinosaur ecology and food networks. Scientists previously assumed dinosaurs obtained sustenance exclusively from terrestrial vegetation and prey. The discovery that marine subsidization played a role in their diets opens new questions about how these extinct animals utilized coastal ecosystems and adapted their feeding strategies to environmental conditions.

The research carries particular relevance for understanding how ancient organisms responded to resource fluctuations. During periods when drought or other environmental stressors reduced plant growth inland, access to washed-up marine vegetation would have provided critical calories. This adaptive flexibility may have influenced which dinosaur populations thrived in specific coastal regions and how they competed for food with other species.

The study also reveals that marine subsidization affected dinosaur prey species, not just the predators themselves. This indicates the process had cascading effects throughout ancient food webs. Herbivorous animals eating marine-derived plants would have provided different nutritional profiles for their carnivorous predators, potentially altering the energy dynamics of entire ecosystems.

Coastal environments during the Late Cretaceous period were fundamentally different from modern coastlines. Shallow seas covered much of North America, creating unique ecological niches. The proximity of ocean to land meant regular opportunities for storms to transport marine material inland. Dinosaurs inhabiting these regions possessed the mobility and behavioral flexibility to exploit this advantage when it presented itself.

The implications extend beyond dinosaur paleontology. Understanding how extinct megafauna utilized marine resources informs broader ecological theory about energy transfer between ocean and terrestrial systems. This knowledge helps predict how modern coastal predators and herbivores might adapt to changing environmental conditions, including climate-driven shifts in food availability.

Future research should examine additional fossil teeth from different dinosaur species and geographic locations to determine how widespread this behavior was. Researchers must also investigate whether certain dinosaur lineages relied more heavily on marine subsidization than others. Chemical analysis of fossil remains might reveal seasonal patterns in marine resource consumption, showing whether dinosaurs deliberately visited coasts during specific times of year or opportunistically grazed whenever storms delivered marine matter ashore.