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Similar to Long-term trends in Caribbean parrotfish abundance at local, regional and basin-wide scales: Implications for fisheries and ecosystem management
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Long-term trends in Caribbean parrotfish abundance at local, regional and basin-wide scales: Implications for fisheries and ecosystem management
- 1. Long-term trends in Caribbean parrotfish abundance at local, regional and basin-wide scales: Implications for fisheries and ecosystem management BRICE X. SEMMENS, CHRISTY PATTENGILL-SEMMENS Poto: A.E. Johnson
- 2. • The story: Diadema die, parrotfish redundant, but parrotfish continue to decline, mediating competitive advantage of algae • Reefs die. • Solution: stop fishing parrotfish. The Importance of Parrots
- 3. •“Adopt robust conservation and fisheries management strategies that lead to the restoration of parrotfish populations, including the listing of the parrotfish in relevant annexes of the Protocol concerning Specially Protected Areas and Wildlife (SPAW protocol) of the UNEP Caribbean Environment Programme.” #1 Recommendation From the Report
- 4. •“Simplify and standardize monitoring of Caribbean reefs and make the results available on an annual basis to facilitate adaptive management.” #2 Recommendation From the Report
- 5. • Roving Diver Technique, all species, average 60 minute search time, multiple habitats, log10 abundance categories • 160,000 surveys in Caribbean over last 29 years REEF Fish Survey Project
- 6. • Using REEF data, we can define the changes in abundances of fishes divers see • Helps to understand changes in assemblages at “tourism” depths • Good fisheries independent proxy (index) of abundance REEF Fish Survey Project
- 8. Medium Bodied Conspicuous Parrots QUEEN PARROTFISH Scarus vetula REDBAND PARROTFISH Sparisoma aurofrenatum STOPLIGHT PARROTFISH Sparisoma viride PRINCESS PARROTFISH Scarus taeniopterus STRIPED PARROTFISH Scarus iserti
- 9. 0 2000 4000 6000 8000 10000 12000 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 Number of Surveys By Year ~160,000 Surveys to Date, over ~30 Years
- 12. 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 % OF SURVEYS BY YEAR BONAIRE CURACAO TORTOLA ST THOMAS UTILA ROATAN GRAND CAY LITTLE CAY KEY WEST KEY LARGO
- 13. Trends based on Species…
- 15. Queen Parrotfish
- 19. Trends based on Sites…
- 20. Bonaire
- 21. Bonaire
- 22. Grand Cayman
- 23. Tortola
- 24. Roatan
- 25. Key Largo
- 26. • Parrotfish complex responds to external forcing as a block • There is no synchrony or common trends of species other than at the local (island) scale • No strong evidence for basin wide declines in parrotfish over the last 30 years Conclusions
- 27. • These data largely come from the most popular dive sites (with often little fishing pressure) • May paint an overly rosy picture of parrotfish region wide • I’ve picked species based on commonness and conspicuousness, thus not a random sample Caveats
- 28. • Those who spend $1000s to go diving in far-flung regions, and then spend all their time collecting data for us to use. For free. • FOR FREE. • It’s ridiculous. ACKNOWLEDGEMENTS