Brigitta I. van Tussenbroek Universidad Nacional Autónoma de México - Impact of pelagic Sargassum on coastal ecosystems in the Mexican Caribbean
•Download as PPTX, PDF•
0 likes•208 views
International conférence on sargassum Fridayn October 25th, 2019 Day 2 - Crossing perspectives and sharing experiences ---- Conférence Internationale sur les Sargasses Vendredi 25 Octobre 2019 Journée 2 Regards croisés et partage d’expériences
Recommended
More Related Content
What's hot
What's hot (20)
Similar to Brigitta I. van Tussenbroek Universidad Nacional Autónoma de México - Impact of pelagic Sargassum on coastal ecosystems in the Mexican Caribbean
Similar to Brigitta I. van Tussenbroek Universidad Nacional Autónoma de México - Impact of pelagic Sargassum on coastal ecosystems in the Mexican Caribbean (20)
More from Région Guadeloupe
More from Région Guadeloupe (17)
Recently uploaded
Recently uploaded (20)
Brigitta I. van Tussenbroek Universidad Nacional Autónoma de México - Impact of pelagic Sargassum on coastal ecosystems in the Mexican Caribbean
- 1. Impact of pelagic Sargassum on coastal ecosystems in the Mexican Caribbean 25/10/2019 Brigitta I. van Tussenbroek Reef Systems Unit-Puerto Morelos Instituto de Ciencias del Mar y Limnología Universidad Nacional Autónoma de México (UNAM)
- 2. CANCUN HOTEL ZONE 1989 - 2014 March 2018 Oct 2019 Cancun hotel zone: webcam Mexican Caribbean (FRINGING) REEF SYSTEMS Puerto Morelos: my office view PM Xa > 900 km coastline
- 3. Golden tide vs Sargasso brown tide searchoflife.com
- 4. Sargasso brown tide (2015)
- 5. Before Sargasso brown tide
- 6. Sargasso brown tide (Sbt) H2S bacteria Oxygen Stress Sbt ~ 20 – 100 m Area of influence (100s m –kms?)
- 7. Puerto Morelos (daily O2 cycle) Xahuayxol (anoxic coastal fringe) • Light reduction results in failure of oxygen production through photosynthesis by primary producers • Increased bacterial activity due to decomposition of organic material depletes Oxygen Sbt – Oxygen deficit HYPOXIA ANOXIA
- 8. Sbt – Mortality of motile fauna Fotos: ECOSUR
- 9. During Sbt Before Sbt Sbt – Mortality of benthos
- 10. Waves can move tremendous amounts of sand in the surf and swash zones Wikipedia Seagrass territory! Benthic seagrasses fix sediments Area affected by Sbt!
- 11. -50 0 50 100 150 200 0 10 20 30 40 50 Elevación(cm) Largo de la playa (m) Transect 1 Feb 2007 jun-17 -50 0 50 100 150 200 0 10 20 30 40 50 Elevación(cm) Largo de la playa (m) Transect 3 Feb 2007 jun-17 Benthic seagrasses fix sediments Cancún- Mirador Nizuc 1 1 3 3
- 13. Sargasso collected from beach sections of hotels and the public beach at Puerto Morelos 2018 0.0 2000.0 4000.0 6000.0 8000.0 10000.0 12000.0 1 2 3 4 5 6 7 8 9 10 11 12 Sargassum(m3km-1month-1) Month Data collected by ICML, UNAM See also Protocolo Puerto Morelos ~4000 m3 per km per month How much Sargassum arrived?
- 14. How much is 4000 m3 /month / km? 2.4 40.3 NORMAL YEAR SARGASSUM YEAR N (Tons km-1) 0.15 3.44 NORMAL YEAR SARGASSUM YEAR P (Tons km-1) • ≈48000 m3 Sargassum / km / year • 84 dry kg por m3 • 1 dry g ≡ 25 mg Corg 1008 Tons Corg / km / year ¿How much is this in C credits? • 1008 ton Corg = 3696 ton CO2 • C trade US$28 por ton of captured CO2 103,488 US$ per km per year Input of Organic C Normal year: Hernández-Terrones et al. 2011 1 dry g ≡ 7.53 mg N & 0.075 mg P (van Tussenbroek et al. 2017) Input of N & P
- 15. Sbt - Impact on ecosystems Heavy metal contamination? Water Transparency Puerto Morelos Reef Lagoon 1 year after Sbt of 2015 Torrescano-Valle et al. in prep. Potentially Toxic LOD Van Tussenbroek et al. 2017 Concentration in Sargassum tissues
- 16. Sbt - Impact on communities Shift in seagrass community Microbial community ? Beltrán et al. in process 0-28 days0-28 days Seawater Decaying sargasso Sargasso has a different microbioma than seawater Before Sbt After Sbt Lab. Pastos-UNAM - et al. in process
- 17. Sbt - Impact on communities Trophic relationships ? New Introductions ? Monroy-Velázquez et al. 2019 Sargasso - Associated fauna Idotea metalica Sygnatus pelagicus Stephanolepsis hispidus Litopia melanostroma www.ncfishes.com Cabanillas-Terán et al. 2019 Sargassum blooms alter the trophic structure of the sea urchin Diadema antillarum
- 18. Sbt - Impact on communities Shift in reef community? Increasing coral death & disease? Various Reef Labs – UNAM Reef Park Pto. Morelos - CONANP Coral Reef Algal Reef Likely due to decrease in water quality, but no direct relationship with Sbt has been established
- 19. After a Sbt – The system has changed! H2S stress stress Coral Reef ?
- 20. Management of the massive Sargassum influx is urgently needed and poses a major challenge But ….Restoration of the damaged ecosystems after we have properly attended this massive influx will be an equally large challange! Conclusion
- 21. Thank you In collaboration with: Rosa E. Rodríguez-Martínez, Eric Jordan, Marta Garcia Sánchez, Veronica Monroy, Lorenzo Alvarez, Patricia Thomé, Edgar Escalante, Miguel Gomez, José Antonio Lopez Portillo, Patricia Briones-Fourzán, Elisa Vera, Rodolfo Silva Casarín, Ismael Mariño, Julio Espinoza-Avalos, Nancy Cabanillas- Terán, Nuria Torrescano-Valle, Silvia Carrillo, Héctor A. Hernández Arana, Hazel M. Canizales-Flores, Carlos E. González-Godoy, M. Guadalupe Barba-Santos, Alejandro Vega-Zepeda, Ligia Collado-Vides, and many others SAMMO, UASA-ICML