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"Carcharocles megalodon"
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Mega shark : megalodon
\"Provides a revealing look at the prehistoric Mega Shark through a fictional graphic novel story, accompanied by nonfiction facts and fossil record information\"-- Provided by publisher.
Book
Body-size trends of the extinct giant shark Carcharocles megalodon: a deep-time perspective on marine apex predators
The extinct shark Carcharocles megalodon is one of the largest marine apex predators ever to exist. Nonetheless, little is known about its body-size variations through time and space. Here, we studied the body-size trends of C. megalodon through its temporal and geographic range to better understand its ecology and evolution. Given that this species was the last of the megatooth lineage, a group of species that shows a purported size increase through time, we hypothesized that C. megalodon also displayed this trend, increasing in size over time and reaching its largest size prior to extinction. We found that C. megalodon body-size distribution was left-skewed (suggesting a long-term selective pressure favoring larger individuals), and presented significant geographic variation (possibly as a result of the heterogeneous ecological constraints of this cosmopolitan species) over geologic time. Finally, we found that stasis was the general mode of size evolution of C. megalodon (i.e., no net changes over time), contrasting with the trends of the megatooth lineage and our hypothesis. Given that C. megalodon is a relatively long-lived species with a widely distributed fossil record, we further used this study system to provide a deep-time perspective to the understanding of the body-size trends of marine apex predators. For instance, our results suggest that (1) a selective pressure in predatory sharks for consuming a broader range of prey may favor larger individuals and produce left-skewed distributions on a geologic time scale; (2) body-size variations in cosmopolitan apex marine predators may depend on their interactions with geographically discrete communities; and (3) the inherent characteristics of shark species can produce stable sizes over geologic time, regardless of the size trends of their lineages.
Journal Article
The meg
A prehistoric shark surfaces off California and proceeds to wreck havoc. Sixty feet long, it is a member of a species living in the ocean depths for the last 100,000 years. Jonas Taylor, a paleontologist and deep-sea submariner, tries to capture it for an aquarium.
Book
Breakthrough. Decoding Megalodon
Scientists have concluded that meg\" was able to achieve its gargantuan proportions by starting its carnivorous diet early -- in the womb.\"
Streaming Video
Meet the megalodon (carcharocles megalodon), a huge, prehistoric shark that dwarfed the great white
A video on the megalodon, a fossil shark and the largest known predator.
Streaming Video
Uncover the top 10 facts behind the prehistoric megalodon shark
A video on the top 10 facts behind the megalodon, fossil shark.
Streaming Video
Overview of the possible causes of the megalodon's extinction
Video on the Megalodon shark.
Streaming Video