A new study finds that sharks living on reefs near areas populated by people have declined by between 90 and 97 percent compared to relatively pristine reefs where few or no people live.
The authors of the paper in early view at Conservation Biology deployed 1,607 towed-diver surveys—that’s where scientists are used as shark bait (kidding, sort of)—to count sharks at 46 reefs in the central-western Pacific Ocean. They combined those data with information on human population, habitat complexity, and reef area, as well as with satellite-derived measurements of sea surface temperature and oceanographic productivity.
These methods allowed them to fill in the blanks on the numbers of missing sharks. Their models showed that:
- Densities of gray reef sharks (Carcharhinus amblyrhynchos), whitetip reef sharks (Triaenodon obesus), and other reef sharks increased substantially as human population decreased.
- Densities of reef sharks increased substantially as primary productivity and minimum sea surface temperature (which correlates to reef area) increased.
From the paper:
Simulated baseline densities of reef sharks under the absence of humans were 1.1–2.4 [per hectare] for the main Hawaiian Islands, 1.2–2.4 [per hectare] for inhabited islands of American Samoa, and 0.9–2.1 [per hectare] for inhabited islands in the Mariana Archipelago, which suggests that density of reef sharks has declined to 3–10% of baseline levels in these areas.
“[Sharks] like it warm, and they like it productive,” said Julia Baum, Assistant Professor at the University of Victoria, Canada, referring to the increase in reef sharks the team found in areas with higher water temperatures and productivity. “Yet our study clearly shows that human influences now greatly outweigh natural ones.”
- NADON, M. O., BAUM, J. K., WILLIAMS, I. D., MCPHERSON, J. M., ZGLICZYNSKI, B. J., RICHARDS, B. L., SCHROEDER, R. E. and BRAINARD, R. E. (2012), Re-Creating Missing Population Baselines for Pacific Reef Sharks. Conservation Biology. doi: 10.1111/j.1523-1739.2012.01835.x