Tag Archives: St. Joe Bay

Black mangrove propagules.

VIDEO- Mangroves and Cold, & Oyster Doctors Airs on WFSU

Rob Diaz de Villegas WFSU-TV

Wednesday, March 19 at 8 PM on WFSU-TV, catch the broadcast premiere of the new In the Grass, On the Reef documentary: Oyster Doctors.

Withered Black Mangrove

Although it was a relatively mild winter, one or two harsh cold snaps provided Randall an opportunity to test black mangrove survivorship in north Florida marshes, where it has become a more frequent resident.

Lately I’ve been preoccupied with wrapping up the National Science Foundation grant that funds a lot of what appears on this blog, and thinking about the future of the project.  The last major piece of funded content is our latest documentary, Oyster Doctors, chronicling four years of research conducted by Dr. Randall Hughes and Dr. David Kimbro.  On the one hand, the show is about learning how coastal ecosystems work.  And it’s about how the inner workings of salt marshes, oyster reefs, and seagrass beds provide people with jobs, clean water, and protection from erosion and storm surge.  But it’s as much about the ecologists as it is about the ecology.

Randall and David, and their graduate students- Tanya Rogers, Hanna Garland, and Althea Moore- are people who get inspired to pursue a line of research.  They get excited by an idea, like predators affecting prey more through fear than through their eating them.  They get excited about places.  David gets geeked out about predatory snails on Bay Mouth Bar.  Hanna falls in love with Apalachicola and wants to figure out its oyster problem.  Randall makes observations about things she sees in St. Joseph Bay marshes and it sets her on a path.  In one case, that path led her to the video above.

Randall’s interest in black mangroves has unfolded before our eyes on this blog, starting in 2010.  These trees have a range that ends to the south and east of here, yet here they were by her study sites.  To learn more, she started experiments.  Our Oyster Doctor premiere events on March 8 gave her a reason to come down from Massachusetts (she left the FSU Coastal & Marine Lab in January of 2013) and check on her mangrove experiments.  These experiments are growing away in the St. Joseph Bay State Buffer Preserve.  One of our premiere events was a walking tour of the Buffer and a visit to the experiment site.  One reason the trees have been spreading in northern Gulf marshes are the warmer winters we’d been having in recent years.  Recent cold snaps let Randall (and a group of interested parties) better see how certain sets of trees in her experiment might survive up here.  And so, as we finished the show, which has its section on the mangrove research, we went right back into the field and gained a little extra knowledge. Nature’s inner workings never stop unfolding.

Later that day, Randall joined Apalachicola Riverkeeper Dan Tonsmeire for an excursion within the Apalachicola River delta. Exploring the connection between freshwater bodies and coastal ecosystems has become a focus of this project since we started our EcoAdventures segments.

Later that day, Randall joined Apalachicola Riverkeeper Dan Tonsmeire for an excursion within the Apalachicola River delta. Exploring the connection between freshwater bodies and coastal ecosystems has become a focus of this project since we started our EcoAdventures segments.

In the coming months, we’ll get more posts detailing Randall and David’s findings in the studies we’ve been following.  And then… well, certainly more EcoAdventures.  Through those we can explore all of our area, connecting forests with swamps with rivers and back to the coasts, where this project was born.  As people signed up for the premiere and its associated events, we left a spot for people to tell us about their connection to our local wild spaces.  I’ll be looking those over as we move forward.  I love having a window into what all of you care about.  Likewise, this blog has a comments section!  Tell us what gets you excited about the outdoors, what you’d like to see more of, what’s not being covered?

Follow us on Twitter @wfsuIGOR

This material is based upon work supported by the National Science Foundation under Grant Number 1161194.  Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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Coastal Roundup August 10th – August 17th, 2012

Rebecca Wilkerson WFSU-TV

Choctawhatchee Basin Alliance Volunteer Day – Oyster Reef Bagging
Oyster reefAugust 17th
Santa Rosa Beach, FL
(850) 200-4173
For more information and a list of volunteer opportunities visit the Choctawhatchee Basin Alliance volunteer page.

Treasure Hunt Scallop Drop
Bay scallop in St. Joe Bay seagrass bedAugust 17th- September 10th
St. Joseph Bay, FL
(850) 229-7800

16th Annual MBARA Kingfish Tournament
August 25th
Mexico Beach, FL
For more information visit the MBARA tournament page.

“Sopchoppy Stop” Eco-Heritage Tour
P1000534August 25th
Sopchoppy, FL
(850) 926-3376
For more information visit the Sopchoppy Stop tour page.

In the Kitchen

This week will mark the 100th birthday of Julia Child on August 15th. In celebration of the cooking legend, Marc Matsumoto uses Child’s Bouillabaisse to set the framework for a simple Seafood Stew using local ingredients. Learn more about his technique on the PBS Food Blog.

While we’re on the subject of local ingredients, check out how Gulf shrimp from Franklin County is used in this Buffalo Shrimp recipe.

On the East Coast

Near Dr. Hughes and Dr. Kimbro’s  St. Augustine research sites is the Fort Matanzas National monument. This National Park includes beach habitat that is crucial to several iconic Florida species. The National Park Service 2012 management plan has been drafted and some of the changes pose a risk to the wildlife here. The National Park Service will be hearing public input on the draft until August 24th. Visit this Audubon Florida news release for more information.

Clean Water Act

October will mark the 40th anniversary of the Clean Water Act. It is important to understand the importance of this piece of legislation, and to remember that there is still work that needs to be done. Visit this National Geographic News Watch article to read more about the Clean Water Act and its past, present, and future.

Apalachicola River

Apalachicola River at Bloody BluffOctober is also when the 2012 RiverTrek paddle is happening. This five-day  journey along the Apalachicola River helps raise awareness of the plight of the river system. RiverTrek also raises money for the Apalachicola Riverkeeper. For more information about RiverTrek , check out Doug Alderson’s Visit Tallahassee blog.

Summer Reading

If your summer reading was taken up by technical manuals, historical tales, or academic studies, you’re not alone. Although these aren’t the typical “beach books” we associate with summer lounging, many people use vacation time to catch up on the reading they’ve pushed aside throughout the year. Read more about which books are being packed for vacations on the NPR Books Blog.

In the Grass, On the Reef is funded by a grant from the National Science Foundation

Dude, where’s my water?

Rob Diaz de Villegas WFSU-TV

IGOR chip- human appreciation 150

St. Joe Bay is really jumping in the summer. People are everywhere; scalloping, fishing, kayaking and snorkeling. The people are mostly gone in the autumn, as they head back to work and school, and the weather is a little cooler. With less people to scare them off, you see more blue crabs, stingrays, and sharks swimming closer to the shore. It’s my favorite time of year to get footage there. When winter rolls around, the only people out on the water either have to be because they’re working (like Randall and her crew), or they’re just hardcore ecowarriors. It can make for difficult paddling in the winter (though this December is much milder than last year, when we shot this footage).

Super-low tide in St. Joe Bay.

The difficulty doesn’t so much stem from the cold, though it can get cold (especially for a native Floridian who thinks Massachusetts beach water is too chilly in July). The real challenge is the wind and the tides. It makes for a surreal landscape.  It’s mostly devoid of living animals, at least on the surface, but that north wind does push some interesting seagrass bed denizens onto the marsh with the seagrass wrack.

As I noted earlier, it has been milder this year.  Hopefully that holds for our next few EcoAdventure shoots, which include trips down the Wacissa and St. Marks rivers.  And I’ve already started planning some of next year’s shoots as well, so stay tuned!

Dan and Debbie VanVleet, who we interviewed in the video, are the proprietors of Happy Ours Kayak and Canoe Outfitter.
The music in the video was by Bruce H. McCosar.

A long time in the making

Dr. Randall Hughes FSU Coastal & Marine Lab

IGOR chip- biodiversity 150

As I mentioned in my last update, we have been working to set up a new marsh experiment in St. Joe Bay. The goal of the experiment is to see whether the genetic diversity of marsh cordgrass (Spartina alterniflora) affects how quickly or abundantly the plants grow, or influences the number of fiddler crabs, grasshoppers, snails, and other critters (like Ibis??) that call the plants home. But what is genetic diversity, exactly, and why do we think it may be important?

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A flock of Ibis resting among our experimental marsh plots.

Spartina is a clonal plant, which means that a single “individual” or clone made up of many stems can dominate a large area (low diversity), or there can be lots of different individuals mixed together (high diversity). In our surveys of marshes in the northern Gulf of Mexico, we find that there can be as few as 1 and as many as 10 clones in an area of marsh about the size of a hula-hoop. You may notice that our experimental plots are about that same size, though we used irrigation tubing rather than actual hula-hoops (not as fun, but more practical and less expensive!). We’re testing whether the differences in genetic diversity (1 vs. 10 clones) that we see in natural marshes has any influence on the marsh community.

A single experimental plot of Spartina that is 1m in diameter.

But why genetic diversity? We know from experiments by other researchers that Spartina clones grown individually differ in height, how many stems they have, and other characteristics. These same plant traits affect the critters that live in and among the plants – for example, periwinkle snails preferentially climb on the tallest plants. Because different animals may be looking for different plant traits, then having greater diversity (genetic and trait) may lead to a greater number of animal species that live in that patch of marsh. Or, a single clone may be the “best”, leading to higher numbers of animals in lower diversity areas.

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A view of the existing marsh behind our experiment.

As my title alludes, this experiment has taken a long time to come to fruition, in large part because it’s impossible to look at any 2 stems in a marsh and know for certain whether they’re the same individual or not. Unlike some clonal plants such as strawberries, where there are multiple berries connected by a single above-ground “runner”, Spartina has runners (aka, rhizomes) that connect stems of the same genetic individual under the ground, making it difficult to tell which stems are connected to which. We have 2 ways to get around this problem: (1) we use small snippets of DNA (analyzed in the lab) to tell clones apart, and (2) we start with single stems that we know are different clones and then grow them separately in the greenhouse until we have lots of stems of each different clone. It’s this latter part that has delayed this experiment – it has taken much tender loving care from Robyn over the last 2 years to get our Spartina clones to grow in the greenhouse to the point that we have enough of each clone (36 small flowerpots of each, to be exact) to plant in our experiment.

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Emily and Robyn work to remove existing rhizome material from around the plot edges.

But plant we finally did! With lots of help from members of the Hughes and Kimbro labs, we got all the sand in the experimental plots sieved (to remove any existing root material) and all the plants in the ground the Thursday and Friday before Thanksgiving.

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Team Hug-bro (Hughes and Kimbro) helping sieve sand!

 

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Meagan and Randall get the easy job - planting the plants.

Now we get to wait and see (and take data) whether Spartina genetic diversity matters for the marsh plant or animal community. There won’t be any quick answers – the experiment will run for at least 2 years – but we’ll be sure to keep you up-to-date!

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

Tricks or Treats? And more on the effects of predators in marshes.

Dr. David Kimbro FSU Coastal & Marine Lab

IGOR chip_ predators_NCE 150Unlike most of the experiments that I’ve conducted up to this point in my career, the oyster experiment from this past summer does not contain a lot of data that can be analyzed quickly.

For example, predator effects on the survivorship of oysters can be quickly determined by simply counting the number of living as well as dead oysters and then by analyzing how survivorship changes across our 3 experimental treatments (i.e., cages with oysters only; cages with mudcrabs and oysters; cages with predators, mudcrabs, and oysters).  But this simple type of data tells us an incomplete story, because we are also interested in whether predators affected oyster filtration behavior and whether these behavioral effects led to differences in oyster traits (e.g., muscle mass) and ultimately the oyster’s influence on sediment characteristics.  If you recall, oyster filter-feeding and waste excretion can sometimes create sediment conditions that promote the removal of excess nitrogen from the system (i.e., denitrification)

oyster_exp_3box

As we are currently learning, getting the latter type of data after the experiment involves multiple time-consuming and tedious steps such as measuring the length and weight of each oyster, shucking it, scooping out and weighing the muscle tissue, drying the muscle tissue for 48 hours, and re-weighing the muscle tissue (read more about this process here).

After repeating all of these steps for nearly 4,000 individual oysters, we can subtract the wet and dry tissue masses to assess whether oysters were generally:

(a) all shell…“Yikes! Lot’s of predators around so I’ll devote all of my energy into thickening my shell”

(b) all meat…“Smells relaxing here, so why bother thickening my shell”

(c) or a mix of the two.

For the next two months, I will resemble a kid with a full Halloween bag of candy who cannot wait to look inside his bag to see whether it’s full of tricks (nonsensical data) or some tasty treats (nice clean and interesting data patterns)!  I’ll happily share the answer with you as soon as we get all the data in order.

Because of this delay, let’s explore some new research of mine that examined how predators affect prey traits in local marshes and why it matters.

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There are two main ingredients to this story:

(a) tides (high versus low) dictate how often and how long predators like blue crabs visit marshes to feast on tasty prey.

(b) prey are not hapless victims; like you and me, they will avoid risky situations.

attach.msc1In Spartina alterniflora systems, periwinkle snails (prey) munch on dead plant material (detritus) lying on the ground or fungus growing on the Spartina leaves that hover over the ground.  Actually, according to Dr. B. Silliman at the University of Florida, these snails farm fungus by slicing open the Spartina leaves, which are then colonized by a fungal infection.  If snails fungal farm too much, then the plant will eventually become stressed and die.

So, I wondered if the fear of predators might control the intensity of this fungal farming and plant damage.

For instance, when the tide floods the marsh, snails race (pretty darn fast for a snail!) up plants to avoid the influx of hungry predators such as the blue crab.

After thinking about this image for a while, I wondered whether water full of predator cues might enhance fungal farming by causing the snail to remain away from the risky ground even during low tide.  Eventually, the snail would get hungry and need to eat, right?  Hence, my hypothesis about enhanced fungal farming due to predator cues.   I also wondered how much of this dynamic might depend on the schedule of the tide.

Before delving into how I answered these questions, you are probably wondering whether this nuance really matters in such a complicated world.  Fair enough, and so did I.

Addressing this doubt, I looked all around our coastline for any confirmatory signs and found that Spartina was less productive and had a lot more snail-farming scars along shorelines subjected to a diurnal tidal schedule (12 hours flood and 12 hours ebb each day) when compared to shorelines subjected to a mixed semidiurnal schedule (2 low tides interspersed among 2 high tides that are each 6 hours).  Even cooler, this pattern occurred despite there being equal numbers of snails and predators along both shorelines; obviously density or consumption effects are not driving this pattern.

Marsh_foodweb

Ok, with this observation, I felt more confident in carrying out a pretty crazy laboratory experiment to see if my hypothesis might provide an explanation.

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Enter Bobby Henderson.  This skilled wizard constructed a system that allowed me to manipulate tides within tanks and therefore mimic natural marsh systems; well, at least more so than does a system of buckets that ignore the tides.

Deck_schematic1

Within each row of tide (blue or red), I randomly assigned each tank a particular predator treatment.  These treatments allowed me to dictate not only whether predators were present but whether they could consume & frighten snails versus just frightening them:

-Spartina only

-Spartina and snails

-Spartina, snails, and crown conch (predator)

-Spartina, snails, blue crab (predator)

-Spartina, snails, crown conch and blue crab (multiple predators)

-Spartina, snails, cue of crown conch (non-lethal predator)

-Spartina, snails, cue of blue crab (non-lethal predator)

-Spartina, snails, cues of crown conch and blue crab (non-lethal multiple predators)

attach.msc6After a few weeks, I found out the following:

(1) Predators caused snails to ascend Spartina regardless of tide and predator identity.  In other words, any predator cue and tide did the job in terms of scaring the dickens out of snails.

(2) Regardless of tide, blue crabs ate a lot more snails than did the slow moving crown conch and together they ate even more.  This ain’t rocket science!

(3) In this refuge from the predators, snails in the diurnal tide wacked away at the marsh while snails in the mixed tide had no effect on the marsh.

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Whoa…the tidal schedule totally dictated whether predator cues indirectly benefitted or harmed Spartina through their direct effects on snail predator-avoidance and farming behavior.  And, this matches the observations in nature… pretty cool story about how the same assemblage of predator and prey can dance to a different tune when put in a slightly different environment.  This study will soon be published in the journal Ecology.  But until its publication, you can check out a more formal summary of this study here.

If this sort of thing happens just along a relatively small portion of our coastline, I can’t wait to see what comes of our data from the oyster experiment, which was conducted over 1,000 km.

Till next time,

David

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