Tag Archives: biogeographic

Day 6: October Oyster Push- Home Stretch

Rob Diaz de Villegas WFSU-TV

Wednesday, October 27- Finish tiles, go to Jacksonville

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When not losing sleep over whether the tile experiment will work, David dreams of making the tiles. They'll be back in six weeks to check on the progress of the baby oysters they set upon the reefs.

IGOR chip- biogeographic 150Walking down the hall of our dorm at 7 AM, I heard the familiar sound of the dremel from across the street in the lab area.  This time the whole crew was there- Tanya, Hanna, and Cristina cleaning and separating oysters and David Kimbro slicing shells into similarly sized pieces.  The Jacksonville oysters they’re processing have an entirely different kind of predator than the Marineland oysters have in crown conchs.  The Jax shells were speckled with little greenish spots- these are boring sponges.  They bore holes through the shell and take up residence within it.  The specks were making it harder to spot spat.

I was thinking about predators when I was driving today, in particular the crown conchs here.  A1A runs alongside the intercoastal waterway where the oyster reefs are.  Driving north towards the Matanzas Inlet, which is the northern boundary of the crown conch problem, there is a bridge under construction.  While getting some footage of oyster reefs earlier, I noticed how close many of the reefs are to the road and its runoff.  Overall, the area is more heavily settled than the Forgotten Coast sites where David and Randall do their studies.  This drive I took today put a slightly different light on the work they do.  When I’m shooting on the reefs, or in the salt marshes, it sometimes seem like a different world.  But it isn’t, really.  Not that this sudden and very focused problem may not have an entirely natural cause.  But there are a lot of potential factors in play outside of trophic cascades and water salinity.

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Those innocuous looking spots are trying to kill the oyster and take over its shell.

2:00 PM- Hanna, and Cristina drove to Jacksonville to deploy nets at low tide.  Cristina found a deep spot in the mud and sank in waist deep, which is a concern at this site.  The new boat was purchased specifically for this site, as it’s a long kayak trip in somewhat treacherous waters.

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So far, so good for the Saint Augustine spat tiles.

4:30 PM- David and Tanya finish making the Jacksonville tiles and spend about two hours cleaning up the lab space.  Tanya kayaked out to check on the St. Augustine tiles they deployed yesterday before heading to Jax.  David said he had lost sleep last night over whether the tiles would still be there, or if the glue would even hold the spat onto the tile.  Jon Grabowski (NC team leader) has a site with easy public access.  This morning he showed up to find his sites being harvested, the tiles already removed.  So you can see where David would worry.  But, at least over the first night, the SA tiles were fine.

David and Tanya joined the rest of the team in Jacksonville for another awesome Tanya-cooked meal.  I feel I did her a disservice yesterday by not mentioning the zucchini bread and double chocolate biscotti she made, so I’ll do so now.  Yum!  Perhaps On the Reef needs a cooking segment.  Everyone is now settled into a house they all think is haunted.  Hanna put together a makeshift tub on their screened-in porch to keep the spat alive to deploy tomorrow.  One more day to go…

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On Thursday, the October oyster push concludes and the FL, GA/ SC, and NC teams will start looking at the data and continue establishing patterns.

Tide Times and height (ft.) for Jacksonville, October 27, 2010
Low- 5:56 AM (0.2)
High- 12:25 PM (5.7)
Low- 6:42 PM (0.5)

David’s research is funded by the National Science Foundation.

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Day 5: October Oyster Push- A Change of Plans

Rob Diaz de Villegas WFSU-TV

Tuesday, October 26- Tile Team heads to Jacksonville

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The whirring sound, the smell of calcium carbonate dust, the warmth of his face behind the mask and goggles- this is the stuff of David Kimbro's dreams.

IGOR chip- biogeographic 150The WFSU crew stayed the night in St. Augustine to accompany both the Net/ Fish and Tile teams when they headed out at sunrise.  After breakfast, I went out to the lab space (we’re all staying at a research facility very near the reefs they study), and David Kimbro was there, before the sun had made its way out, separating shards of shell with spat on them.  He’d missed all of the field work here up to that point so that this experiment could work.  Until this afternoon, it was all I had seen him do here.  If he was able to focus in on this one aspect of this large an undertaking, it is because Hanna and Tanya have been able to operate independently and pick up the slack.  By the time he actually made it into the field, David followed Tanya’s lead.

Also working hard on this trip are my poor sneakers.  I have an old pair that I designated for my work on this project, shoes I knew I would never wear for anything else.  The reefs in Cedar Key and St. Augustine have torn them up.  I keep stepping in soft mud that hides oysters, or stray clumps cloaked by muddy water.  It might be time to invest in boots.

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There's nothing like the smell of dead fish in the morning.

7:30 AM- Hanna, Tanya, and Cristina went out to retrieve the catch from the gill nets, take sediment samples, retrieve the data loggers, and take some fish stomachs (how else would you know what the predators were eating?).  They also replaced the spat sticks, which were still only attracting barnacles.  Tanya noticed, however, that spat would settle on the rebar below the stick.

A couple of Environmental Scientists from the St. Johns River Water Management System agency kayaked up at some point to watch the proceedings.  They are working with David’s lab to determine why these once commercially viable reefs were overrun and depleted by crown conchs.  The problem seems to be very localized, occurring between Ponce Inlet in New Smyrna Beach and Matanzas Inlet.  David is hoping for more “spinoff projects” like this one, in which he and his lab can use applied science to help specific reef systems.

And while we’re on the topic of predatory snails, Here’s that pic of the Atlantic Oyster Drill:

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Crown conch, tulip snails, and oyster drills heavily populate these Marineland, FL reefs.

2:30 PM- Hanna and Cristina headed to Jacksonville to begin removing clumps of reef with Jacksonville spat on them. But first they were to inspect the house they were renting to see if there was a suitable area to make their Jacksonville spat tiles. That process involves keeping oysters in large tubs of water, prying shells off of the clump, and using a dremel to make the pieces somewhat uniform in size. If I was renting someone a house, I wouldn’t want them doing that in my bathroom. Hanna determined that the house did not have a workable area, causing a shift in their plans. Hanna and Cristina now had to bring the reef segments back to St. Augustine to process. Instead of deploying nets in Jacksonville Wednesday morning, they’ll have to do this in the afternoon after processing the spat all day. And instead of finishing with Jacksonville on Thursday morning, they’ll be there all day (causing David to make his three hour drive home at night).

5:00 PM- David and Tanya retrieve the small fish traps.  A couple of the fish they catch are pretty colorful, I suspect they’re something that once lived in a saltwater aquarium.  They also deployed the tiles into which so much effort had been expended.  It’s a major part of this study, and David is happy to get started on it just five months after that first day in Alligator Harbor.  And it’s still early enough in this three year study that they can tweak the experiment and try it again next year (experiments of this nature don’t always work the first time).

After all the work was done, Tanya made a tasty four-bean vegetarian chili, and everyone enjoyed a relaxed dinner before convening again at 7:30 AM to process more spat.

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David finally makes it out into the field.

Tide Times and height (ft.) for Saint Augustine, October 26, 2010
Low- 8:oo AM (0.3)
High- 2:17 PM (5.2)
Low- 8:41 PM (0.7)
Tide Times and height (ft.) for Jacksonville, October 25, 2010
High- 5:56 PM (0.5)
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Day 4: October Oyster Push “Sweet Boat”

Rob Diaz de Villegas WFSU-TV
David Kimbro’s crew has been split into two teams, the Net/Trap team (N/T) and the Tile team (TI). For a closer look at how David’s team nets and traps larger fish and crabs, click here. To learn more about what the Tile team will be doing, click here. And if you click On the Reef under categories in the sidebar, you can track David’s progress over the course of this study.

Monday, October 25- Both teams in Saint Augustine

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That grey spot (dead center) on the shell is spat. After landing on existing shells, they'll build their own and expand the clump.

IGOR chip- biogeographic 150When I got to St. Augustine, David was chiseling out shards of shell containing oyster spat (baby oysters) from clumps so that he could glue them onto tiles, as he described in Friday’s post.  I got a good look at what spat actually was.  You can see it in the photo here, basically a small oyster with no shell, seeking out a hard surface (often another oyster’s shell) upon which to settle.  David stayed behind doing that as the rest of his crew, and our crew, piled into the boat for this evening’s activities.

This new experiment- placing tiles with the same number of oyster recruits at all sites on every reef across the study- will give them a more precise picture of how young oysters survive at each site.  It also means a lot of extra work, as the spat that goes on the tiles has to be from the specific location to be entirely accurate- spat is harvested one day, immediately chiseled off and made into tiles and placed on the reef, in the span of about two days.  And this is in addition to the other sampling and trapping.  The previous tile method worked fairly well for the NC and SC/GA teams, but for the sake of being consistent, they’ve also had to adapt this method (while cursing David Kimbro’s name).

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Crown conchs in St. Augustine making a snack of an oyster.

As previously noted on this blog, the reefs did have plenty of crown conchs crawling on them.  David and Tanya have also started noticing Atlantic Oyster Drills, a smaller snail we don’t see in the Gulf.  I’ll look for some tomorrow and get a photo or two up.

8:00 AM- Hanna and Randall (N/T team) retrieved the nets that they set last night in Cedar Key.  This is low tide work, as that’s when it’s best to empty the nets.  They got to their first reef after the vultures did, losing a bit of their catch but still able to identify some species from the fish heads left behind.

1:00 PM- Hanna headed to Saint Augustine and Randall headed home.  As Hanna was gassing up the truck and boat, an elderly gentlemen circled the boat, in awe of David’s creation.  Eventually, he said, “sweet boat.”

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A sweet boat.

5:00 PM- Deploy nets, take water samples, and reference water level.  The two teams combined activities that would have kept them out past dark, and finished just as the sun was setting.  They then helped David glue spat onto tiles for another hour or so before heading out to dinner.

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That was the day.  As you see, field work involves a lot of rethinking (as in the tile experiment), thinking on your feet, dealing with circumstances (vultures eating your catch), and coming up with unusual solutions (refitting your boat in a way some might find strange).  It’s pretty late now (as I type this, even though I plan to post this in the morning).  Time to head to bed so that I can get up and shoot that sunrise.

Tide Times and height (ft.) for Cedar Key, October 24, 2010
Low- 10:oo AM (-0.3)
Tide Times and height (ft.) for Saint Augustine, October 25, 2010
High- 1:35 PM (5.3)
Low- 8:41 PM (0.6)

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The Magic

Dr. Randall Hughes FSU Coastal & Marine Lab
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Randall gets back to her roots, placing traps on a reef with Hanna.

IGOR chip- biogeographic 150When I worked as a technician for our current collaborator Jon Grabowski back when he was in graduate school, one of his favorite sayings as we headed out to the field was “This is where the magic happens”. Yesterday and today I got to experience that magic again as I made my first visit to our oyster sites in Cedar Key. Though I spend a lot more time with plants these days, I do love oyster reefs. Maybe it’s because the first field research I did was on reefs (with Jon), or maybe it’s because of the mystique they seem to hold for nearly everyone, but it sure was fun to hear those shells crunch as I stepped out of the boat.

Of course, in addition to “the magic”, there’s also the cuts and scrapes, the no see-ums, and frustrating way that nets get caught on every oyster clump within 2 ft. But something about the reefs wins me over every time!

Enough of all the nostalgia – what did we actually accomplish? Hanna and I started about midday on Sunday, deploying traps at each of the sites. We realized as we headed back to the boat ramp that the return trip we were scheduled to make later that evening after deploying nets would have been pretty challenging in the dark, so we spent most of the afternoon seeking out a plan B. Thanks to some wonderful people in Cedar Key, we ended up docking the boat for the night at a home just near our sites! Around 6pm we headed out to pick up the traps. We didn’t find a whole lot – a few speckled seatrout and some killifish – but we were able to deploy our nets without any trouble (other than the previously mentioned no see-ums). By 9:30pm we were back at the rental house eating our frozen pizza dinner.

P1010636This morning we got up and headed back out to see what was in our nets. Somewhat surprisingly, it was all mullet and catfish! Not that we didn’t expect those fish to be there, but we thought we’d get a greater variety of species. There were also 2 red drum, 1 blue crab, and a couple of crown conchs, but mostly it was mullet, mullet, mullet.

After we got turned around heading back to the boat ramp, I was really glad that we hadn’t tried that trip in the dark last night! All in all, it was a trouble-free trip to the field, and a welcome opportunity for me to see some of “the magic” again myself.

David & Randall’s research is funded by the National Science Foundation.
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Day 3: October Oyster Push “No Nap Time”

Rob Diaz de Villegas WFSU-TV
David Kimbro’s crew has been split into two teams, the Net/Trap team (N/T) and the Tile team (TI). For a closer look at how David’s team nets and traps larger fish and crabs, click here. To learn more about what the Tile team will be doing, click here. And if you click On the Reef under categories in the sidebar, you can track David’s progress over the course of this study.

Sunday, October 24- Net / Trap team in Cedar Key

Randall places traps on a Cedar Key reef

Randall places traps on a Cedar Key reef.

IGOR chip- biogeographic 150After months of walking around In the Grass, Dr. Randall Hughes stepped out On the Reef Sunday, pitching in for some fieldwork with David’s tech, Hanna Garland. They were the Net / Trap team working Cedar Key, while Tanya Rogers is heading up the Tile team in Saint Augustine. Randall, in addition to heading the salt marsh biodiversity study we also follow on this blog, is the co-PI (Primary Investigator) on this biogeographic oyster study. With her other study taking so much of her time and David having things well in hand with this one, she hadn’t made it out into the field until Sunday.  We tagged along with her today.

This was our first time documenting this study outside of Alligator Harbor (which is located a short hour from WFSU-TV) and, actually, it was my first time on any oyster reef other than those. I noticed that the water was a little clearer- I could actually see some of the oyster clumps for a foot or so under water as opposed to not at all. Few of the oyster reefs were as large as in AH, tending more often than not to stay a collection of clumps than an expansive reef. There were also stretches where reefs had been, and all that remained were broken shells. Randall told me that these had either been harvested or that the reefs had just plain failed (Tanya recounted finding two of the Cedar Key reefs obliterated in her last post).

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Scientific equipment being used in an entirely lawful way. This machine filters the sediment floating in the water- including the phytoplankton that oysters eat.

If you take a look at the schedule below, you can see that the events are spread out based on the tide schedule; and there are a couple of days during this push where they start around sunrise and work well into the night. So there are breaks from fieldwork built into the day. I had assumed that this would be “nap time.” To my surprise, this is actually “lab time.” The water samples they had taken on our boat ride had to be filtered, and the filters frozen as fast as possible to prevent bacteria from contaminating them. They set up their “lab” in the kitchen of a condo they were renting. The apparatus they use is a collection of PVC pipes, tubing, and a motor into which they pour the liquid from clear test tubes. Randall had seen a news story this last week where some college kids were arrested for turning their dorm room into a crystal meth lab. She wondered aloud whether someone looking in their window might suspect the same of her and Hanna.

8:00 AM- Travel to Cedar Key

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Boating from reef to reef, we would see places like this where a reef had been decimated. Two of the original Cedar Key sites for this study were destroyed. These are the kinds of things that happen outside of the controlled environment of a laboratory.

12:23 PM- Deploy traps, collect spat sticks, water samples. They once again made use of the new boat, though the public boat ramp is on the other side of the island from where their sites are located. They were going to look for a boat ramp closer to their sites to save a little more time.

The spat sticks so far have only collected barnacles at all of their sites, meaning that they may have started using them past the season in which oysters spawn.

6:00 PM- Retrieve traps, High tide activities: reference water level, replace spat sticks (if possible).

9:00 PM- Deploy nets. Randall and Hanna will retrieve these in the morning before Hanna heads to Saint Augustine to meet up with David Kimbro and the rest of the crew.

Tide Times and height (ft.) for Cedar Key, October 24, 2010
Low- 9:23 AM (-0.3)
High- 3:48 PM (3.3)
Low- 9:13 PM (1.4)

Sunday, October 24- Tile team in Saint Augustine

1:00 PM- Tanya Rogers and new crew member Cristina drive to Saint Augustine.

7:00 PM- Retrieve tiles/oysters.

Tide Times and height (ft.) for Saint Augustine, October 24, 2010
Low- 7:21 PM (0.5)
We’d love to hear from you! Leave your comments and questions below: