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Scientists recently made news by using fossil shark scales to reconstruct shark communities from millions of years ago. At the same time, an international team of researchers led by UC Santa Barbara ecologist Erin Dillon applied the technique to the more recent past. Human activities have caused shark populations to plummet worldwide since records began in the mid-20th century. However, the scientists were concerned that these baseline data may, themselves, reflect shark communities that had already experienced significant declines. Dillon compared the abundance and variety of shark scales from a Panamanian coral reef 7,000 years ago to those in reef sediments today to discern how reef-associated shark communities have changed since humans began using marine resources in the area.

Santa barbaraKerin dillonDepartment of ecologyProceedings of the national academy sciencesNational academyCaribbean panamaசாந்தா பார்பராஏரின் டில்லன்துறை ஆஃப் சூழலியல்தேசிய கலைக்கழகம்கரீபியன் பனாமா