Finalizing the Monitoring
Last years project comes to an end after 9 days in the field monitoring. Captain Pauco Font and I, along with volunteers, monitored both the near and offshore areas of Tres Palmas Marine Reserve for the presence of new marine debris. Below is an image of the tracks we took while looking for new sites of debris.
Monitoring was divided into two methods;
Nearshore and Offshore.
Nearshore methods involved free-diving and removing clothing from affected coral colonies.
After two days in early June, we removed debris off of 60
Elkhorn coral colinies from the southern to the northern edge of the marine reserve.
Below is the recovery of one coral colony after 48 days of monitoring.
The top image, taken on June 13th 2008, shows the rope tethered around the Elkhorn coral branch. To get a grasp on scale, a ruler was layed down on the corals affected area. The middle photo reveals the damage done by the debris suppressing branch growth and causing the white patchiness on the colony. The bottom photo, taken on July 31st 2008, displays new growth and a healthier colony. Growth can be seen occurring on the branches and the white patchiness has dramatically receded.
Procedures like above were taken for each coral colony discovered with debris.
Waypoints were set for each of the 60 colonies enabling us to see the colonies changes through time.
Offshore methods involved tow-boarding and scuba diving.
Tow-boarding was performed when depth and visibility were optimal.
Thus, given the shallow nature of the marine reserve tow-boarding was the dominate method used.
Scuba diving was restricted to the deeper northwest corner of the reserve.
Above is an image from early August of volunteers Quenton Dokken, the executive director of the Gulf of Mexico Foundation, and Daphne McFarlan from the National Oceanic Atomospheric Administration (NOAA) restoration center, monitoring the marine reserve for debris while tow-boarding. Using this method enabled us to find new areas of marine debris. Below is a tire garden discovered while tow-boarding.
Each item found was marked with a waypoint for future removal with volunteers.
The image above contains all items discovered during the 9 days of monitoring. Each symbol represents a particular type of marine debris, as seen in the legend. Within the boundaries of the reserve 77 tires, 60 debris affected colonies, 7 cable areas, 5 trash patches, 3 extensive spots of wood, and 1 location with numerous blocks were found.
With exception to a few items, the majority were found within 200 meters of the shoreline. No items were found in water deeper than 35 feet. Most of the tires were found along the southern nearshore shelf of the marine reserve. This is interesting because last years project left the reserve ‘visually’ clean. After everything they found was removed they ended the fieldwork portion of the project. So, after 11 months of waves, wind, shifting sediments, and flooded quebradas new debris has been found in the reserve. Where did this debris come from? Was it buried all along and revealed after sediments had shifted? Did large winter swells push the debris back into the reserve? Did it come from the quebradas? Did it come from the south? Last years project comes to end with these unanswered questions.
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