Tag Archives: coral graveyard

Day 3: The Coral Graveyard

Much like I am assuming most days on this trip will be, today was full of many new skills both in and out of the water. As a class, we seem to have graduated past simple scenic observational snorkeling and were tasked with developing and testing a research question for our afternoon snorkel. Utilizing a quadrat and a transect tape, we aimed to evaluate the prevalence of the macroalgae penicillus as we swam out away from the dock to closer waters. I must say, this was easier said than done. We thought the algae would be relatively easy to find, yet finding the marine equivalent of a green Truffula tree among a dense forest of also green seagrass did not go as smoothly as first thought. Yet, we managed to find a few, and created a poster outlining our results.

However, after lunch is when the truly exciting action took place. We went on a small walk (this time well protected from the ravenous mosquitoes) and ended up on the seaward side of the island where there is a graveyard of coral fragments. If you have seen the graveyard scene from The Lion King, it had similar vibes, yet in this case, the graveyard provided an unprecedented opportunity to look at the skeleton of stony corals. For my cards and presentations, I did a significant amount of research regarding the different stony corals of the Caribbean, yet many of the ways to tell the species apart is by the skeleton (which you would hope to not see on a healthy reef). This graveyard of coral provided the perfect opportunity to see these unique characteristics which are typically obscured by tissue. Porites divaricata, Pseudodiploria stigose, Acropora palmata and cervicornis, are just a few of the many of species that we saw and discussed. I also happened to find a piece of Eusmilia fastigiata, which was a rare and cool find.

After sadly leaving the coral graveyard, we wrapped the day up with several presentations covering Lionfish, herbivorous fish, piscivorous fish, and a fantastic yet kind of depressing presentation illustrating the future of our coral reefs. Another incredible day.

~Rusty

Favia fragrum
Eusmilia fastigiata

Quadrats + Coral Graveyard

I felt like such a tropical field biologist today (with training wheels of course). We started off the day with a land activity using transects and the quadrats that we made yesterday. Liliana and I got some practice using the gear and with the methodology by gathering data to characterize what percentage of the measured area had evidence of hermit crab movement through the sand. Here is a photo! (The square is the quadrat, the line is the transect, and the orange rectangle is a very fancy dive clipboard)

Then, all of the TFBs put our heads together and came up with a question to test with this procedure out in the seagrass beds. We chose to investigate how the density of penicillus (a green algae) changes with the distance from the shore. We decided on a uniform methodology and got to work! I saw a lot of warty corallimorphs and great Caribbean sea anemones in the seagrass beds! After we collected our data in the water, we came back to the wet lab and compiled our data. We all made a poster that reflected the entire experiment, including results, discussion, and figures (one of which is a taped-on penicillus in a quadrat heart).

While working in the wet lab, I ate some freshly husked coconut as a snack!

Later in the day, we went to what Adrienne called the “coral graveyard,” and which she also described as “the most amazing place on the planet.” It really was amazing! The field of coral skeleton rubble was extremely well-preserved, and we were able to identify a lot of the species! One thing that I was particularly excited about was seeing and correctly identifying Montastraea cavernosa fragments. I took Adrienne’s coral reef ecosystems class, and my semester-long research proposal centered around this coral. It was so gratifying to get to hold a piece of its skeleton framework!

Besides the few sightings I got in during our penicillus data collection, I didn’t have a lot of time or opportunities to focus on my taxonomic group today. However, I am now so much better at recognizing great Caribbean anemones and warty corallimorphs!

Although my collection of mosquito bites has grown to be rather impressive, I can’t wait to get more if that means I can have more days like this!

– McKenna