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Coastal News Today | World - Fossil shark scales provide a glimpse of reef predator populations before human impact


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. ....

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¿Cómo puede contribuir la 'caspa de tiburón' a la conservación de los arrecifes de coral?


Durante 400 millones de años, peces parecidos a los tiburones han merodeado los océanos como depredadores, pero ahora los humanos matan 100 millones de tiburones por año, alterando radicalmente las cadenas alimentarias del océano.
Con base en escamas microscópicas de tiburón encontradas en arrecifes de coral fósiles y modernos en el Caribe de Panamá, los científicos del Smithsonian revelan los roles cambiantes de los tiburones durante los últimos 7 mil años, tanto antes como después de la caza de tiburones en esta región. Esperan que este nuevo uso de los dentículos dérmicos proporcione un contexto para estrategias innovadoras de conservación de arrecifes. ....

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