Category Archives: Wildlife in North Florida- Critters Big and Small

Backyard Ecology (Plus new video on Bay Mouth Bar)

Episode 7: Where Everything is Hungry

(Some species names have changed.)
It’s always a good shoot day at Bay Mouth Bar as every animal seems to be eating every other animal.  Oyster reefs, salt marshes, and seagrass beds– the habitats we’ve covered over the last three weeks- reward those who take the time to look closely.  At Bay Mouth Bar, everything is all out in the open.  For a limited time, anyway…
Dr. David Kimbro FSU Coastal & Marine Lab

IGOR chip_ predators_NCE 150IGOR chip- filtration 150Like most kids, I spent a lot of my formative years in the backyard practicing how to throw the game-winning touch down pass, to shoot the game winning three-pointer, and to sink the formidably long putt.  Although my backyard facilities obviously didn’t propel me into the NFL, NBA, or PGA, they never closed, required no admission fee from my pockets (thanks Mom and Dad!), and were only a few steps away.

Now that I’m striving to be an ecologist at Florida State University, I’m feeling pretty darn lucky about my backyard again. Instead of spending tons of time flying, boating, and driving to far away exotic places, I can use a kayak and ten minutes of David-power to access some amazing habitats right here along the Forgotten Coast.

Part of this coastal backyard was first intellectually groomed by one of the more famous and pioneering scientists of modern-day ecology, Dr. Robert Paine. Five decades ago, Dr. Paine noticed that the tip of Alligator Point sticks out of the water for a few hours at low tide. Of course, this only happens when the tides get really low, which happens about 5 days every month. But when the tip of Alligator Point (which is locally called Bay Mouth Bar) did emerge from the sea each month, Dr. Paine saw tons of large carnivorous snails slithering around a mixture of mud and seagrass. When I first saw this place, my eyeballs bulged out at the site of snails as large as footballs!

Fast- forward 2 decades later: Dr. Paine is developing one of the most powerful ecological concepts (keystone species), one that continues to influence our science and conservation efforts to this very day. Using the rocky shoreline of the Pacific North West as his coastal backyard, he is showing how a few sea stars dramatically dictate what a rocky shoreline looks like.

By eating lots of mussels that outcompete wimpy algae and anemones for space, the sea star allows a lot of different species to stick around. In other words, the sea star maintains species diversity of this community by preventing the mussel bullies from taking over the schoolyard. That’s one simple, but powerful concept….one species can be the keystone for maintaining a system. Lose that species, and you lose the system.

Lightning Whelk

A large lightning whelk found on Bay Mouth Bar in December of 2010.

Ok, let’s grab our ecological concept and travel back in time to Dr. Paine’s earlier research at Bay Mouth Bar. Wow, the precursor to the keystone species concept may be slithering around our backyard of Bay Mouth Bar in the form of the majestic horse conch! In this earlier work, the arrival of this big boy at the bar was followed by the disappearance of all of the former big boys (like this lightning whelk). By eating lots of these potential bullies, the horse conch may be the key for keeping this system so diverse in terms of other wimpy snails.

But why should anyone other than an ecologist care about the keystone species concept and its ability to link Bay Mouth Bar with rocky shorelines of the Pacific NW? Well, what if the lightning whelks eat a lot more clams than do other snails, and less clams buried beneath sediments means less of the sediment modification that can really promote seagrass (Read more about the symbiotic relationship between bivalves and seagrasses here)?  Thanks to Randall’s previous seagrass post, we can envision that less horse conchs could lead to less clams, less seagrass, and then finally a lot less of things that are pleasing to the eye (e.g., birding), to the fishing rod (e.g., red drum), to the stomach (e.g., blue crabs), and ultimately to our economy.

For the past two years, I’ve really enjoyed retracing Dr. Paine’s footsteps at Bay Mouth Bar. But lately, I’m feeling a little more urgent about needing to better understand this system because it’s disappearing (aerial images provided by USGS’s online database at http://earthexplorer.usgs.gov/).

To figure this out, we repeat a lot of what Dr. Paine did five decades ago. At the same time, we are testing some new ideas about how this system operates. For example, if the horse conch is the keystone species, is it dictating what Bay Mouth Bar looks like by eating stuff or by scaring the bully snails? How exactly does or doesn’t the answer affect clams, seagrasses, birds and fishes?

Luckily, because this system is so close, with some persistence and some good help, we’ll soon have good answers to those questions.

Cheers,

David

Ps: Many thanks to Mary Balthrop for helping us access this awesome study system every month.

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

Oyster reefs. Huh! What are they good for!

Episode 4: The Hidden Value of an Oyster Reef

Weeks ago, we came up with a schedule for posts and videos and somehow had our video on oysters due for the week after Governor Scott declared this year’s oyster harvest a failure.  This led to one minor alteration in the above video, but the video was meant as an overview to the services provided by oyster reefs.  There will be content related specifically to Apalachicola Bay in the coming weeks.

Dr. David Kimbro FSU Coastal & Marine Lab

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There are a lot of things that a marine scientist can study such as charismatic animals (dolphin and turtles) or the waves and currents that fuel my surfing addiction. So, why do I spend most of my time mucking around in mud to study the uncharismatic oyster?

Short answer: because they can provide the foundation for a lot of things that we depend on. Now, some of these benefits or services are obvious and many others aren’t.

Let’s start with the obvious. Just like raising cattle supports tons of jobs and our appetite for hamburgers (I recommend reading Omnivores Dilemma if you want to see how eating meat can be environmentally friendly), the harvesting of oysters financially supports many folks as well as the scrumptious past time of tasting oysters on the half shell as the above video just showed me doing at my local favorite, the Indian Pass Raw Bar!

Unfortunately, the importance of this service was made all to clear to us when the Florida governor recently declared this year’s harvest to be a failure and applied for federal relief for the local economy (Download a PDF of the Department of Agriculture and Consumer Services report here). It’s also unfortunate that this type of bad news has a history of indicating that this natural resource is in trouble and that more trouble may be on the way. To see why, check out a study by Dr. Michael Kirby that showed how this service progressively collapsed from New England down to Florida over the past three centuries. In a nutshell, the pattern of collapse mirrors the increasing number of humans that have over-used this service.

But even if there are no questions about the importance and collapse of the previous service, many folks are asking great questions about whether oysters provide other important services in the form of protected reefs that may offset or exceed their commercial/restaurant value. In other words, what good are oysters to us if they don’t make their way to the raw bar?

A sand flat oyster reef in 2002

An oyster reef built by Dr. Jon Grabowski and Dr. Randall Hughes in 1997, pictured in 2002.

Well, my good buddy Dr. Grabowski’s research used relatively tiny oyster reefs to highlight one less obvious service that involves reefs really ramping up the numbers of commercially and recreationally important fishes (drum) and crabs (stone crabs and blue crabs)….yum!  Given that the oyster reefs used to be 12 feet tall and as long as football fields, can you imagine how many crabs and fishes hung around those really big reefs way back then? Heck, even I could have caught a fish!

Another thing that charismatic and good tasting animals need in order to keep our eyes and tummies happy is some healthy coastal water. Having too much plant-like material (phytoplankton) floating around in the water, sinking to the bottom, and decaying can deplete all of the water’s oxygen. Because such a place is very uninviting for lots of sea life, low oxygen areas will not have many animals that are pleasing to the eye, the fishing rod, or our palette.

Columbia River Water Diatoms

Diatoms, single celled phytoplankton. © Pacific Northwest National Laboratory

Enter the filter-feeding oyster.

While it’s hard to know if today’s tiny amount of oysters reefs sufficiently filter enough water, we do know that the really big reefs of our grandparents and their grandparents time were essentially like huge skimmers in swimming pools as big as the Chesapeake Bay.

As the ESPN football talking heads like to say: C’mon Man! Really?

I kid you not, because Jeremy Jackson and colleagues dug through some Chesapeake mud to figure this out for us. Preserved in the mud is stuff that settled out from the water over time, with deeper mud containing older stuff and shallower mud containing newer stuff. It turns out that as we over-ate and turned the larger oyster reefs into small ones, the stuff in the mud transitioned from sings of healthy water to symptoms of unhealthy water. And because the oyster crashes came before the drop in water quality, it’s more likely that oysters maintained the good water signs as opposed to the reverse scenario of the good water signs maintaining the big oyster reefs.

So this points to a third type of service that oyster reefs CAN provide in the form of water-quality. Admittedly, it’s hard to put a dollar amount on that as opposed to the dollar amount that a dozen raw oysters brings in at a raw bar.

But another less obvious way that oysters can help maintain water quality is by removing the nutrients that a lot of the unwanted phytoplankton depend on.

C’mon Man!

Slide by Ashley R. Smyth, Piehler Lab, UNC Chapel Hill Institute of Marine Sciences.

You see, after oysters suck in the water, filter out their preferred phytoplankton (some are good, but some probably taste as bad as my poor attempt of making southern biscuits), they eventually “poop” their waste out into the mud. Some of this waste makes all sorts of bacteria do all sorts of different things. One of these cool things involves taking a form of nitrogen (think fertilizer on your lawn) that is readily sucked up by nasty phytoplankton and converting it into a form that phytoplankton can’t use (think bad fertilizer that you want to return for a refund).  This is called de-nitrification, and it’s a way that oyster feeding and pooping can help maintain healthy coastal conditions. Even cooler, we can slap a dollar amount on it if we think about how much money it costs a waster-water treatment facility to remove the same amount of nitrogen. My buddy in North Carolina Dr. Mike Piehler did just a study and found that the value of this service is about 2,718.00 dollars per acre of oyster reef. And unlike a dozen raw oysters, this service keeps on giving like the energizer bunny.

Finally, and we are now at service 4 in case you are counting, oyster reefs can buffer the waves and storms that eat away at our shorelines, coastal roads, and homes.

Before signing off, I have to also acknowledge that not every oyster reef performs each of these services. Just like my brother and I look pretty darn similar to someone outside of my family, when you look closer, we are really different. Individual oyster reefs are the same way. Heck, while I can do different things well if you catch me in the morning with a cup of coffee, I often really stink at those same things if you check in with me after a too big and sleep-inducing lunch!

This point segues nicely into my research interest about the “context-dependency” of the obvious and not so obvious services that coastal habitats can provide. In other words, why are some reefs doing some services but others are not? This question really crystallizes the essence of a collaborative project that I’m working on with colleagues from FSU, Northeastern University, University of North Carolina, and University of Georgia.

In our crazy-fun, at times maddening, and democratic research team, we are testing whether the answer depends on differences in big hungry and scary predators like drum and crabs lurking around the reefs. Sure, some of these might eat an oyster that doesn’t make it on to my plate at the raw bar. But overall, they may benefit some reefs by eating a lot of the smaller crabs that really like to munch on oysters. And even if they don’t eat all of these oyster munchers, we’re thinking that their presence may sufficiently freak out oyster munchers so that they spend more time watching their backs and less time munching. Hence, the ecology of fear!

Thanks for wading through this long post. If I promise to write shorter posts in the future, then I hope you’ll follow our journey of testing whether predators help maintain services not only in oyster reefs, but also in the marshes and mudflats of the southeast Atlantic and Gulf coastlines.

Cheers,

David

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

The Biology / Art Intersection

Tanya Rogers FSU Coastal & Marine Lab

Blue crab – colored pencil

IGOR chip- human appreciation 150Art is something I’ve always loved almost as much as biology. If I hadn’t been a biology major in college, I probably would have been an art major, and it is the fusion of the two that I like in particular: the realistic artwork of plants, animals, other living creatures, and their environments. There is something I especially enjoy about drawing plants and animals, because to draw them accurately, you have to look at them with a closeness and a consideration beyond the everyday. You notice the forms and structures and beautifully intricate details you would have never seen otherwise. I find that you see the organism in a new light, with a new appreciation, understanding, and respect.

It wasn’t until a couple years ago that I discovered the field of scientific illustration – that this  marriage between biology and art was in fact an entire line of work. Artwork of biological organisms is used for a variety of purposes, including field guides, identification keys, scientific papers, descriptions of new species, textbooks, educational displays, brochures, and posters. A number of people work as full or part time scientific illustrators, often for museums or publishers, or as free lancers. Beyond the fine arts, it appears there’s a market for the exact types of drawings I’ve always loved to create.

Sand dollar and sea urchin – pen and ink

You may wonder why scientific illustrations are still important today given the ubiquity of photography. It is mainly because there are limitations to what photographs can depict clearly. With illustrations, important details can be captured and highlighted, the background and unimportant details omitted, photographic artifacts eliminated (like obscuring highlights and shadows), and the organism best positioned to convey its important features in a way that is easily interpreted. Interactions, behaviors, and assemblages can be depicted that would be difficult or impossible to capture on film. Fossil and other extinct plants and animals can be portrayed as they would look in real life. Illustrations are also very useful for schematics and diagrams, and are very commonly used to depict medical procedures.

Scientific illustration differs from other forms of art in that accuracy is imperative, but aesthetics are also of consideration. Composition is important, as is skillful use of the artistic medium and the portrayal of three-dimensional form, light, shadow, and depth. Great illustrations should look both realistic and visually appealing, capture the right amount of detail, and perform well the interpretive function for which they were created. The medium itself can range widely depending on how the illustration is to be used. Pen and ink, colored pencil, watercolor, and other traditional media are common, and digital artwork is increasingly common today.

The whelk Busycon spiratum – graphite

Last summer I decided to attend the annual conference of the Guild of Natural Science Illustrators held that year in Olympia, Washington. It was a fabulous conference where I met many phenomenal scientific illustrators, all far better artists than me, and all wonderful and friendly people with a common love of both science and art. The talks, workshops, and field trips at the conference, like the interests of the attendees, were a mixture of art and biology, encompassing everything from techniques (like how to draw fish scales accurately) to interesting local natural history (like research on crows’ ability to recognize human faces). I picked up many new techniques and ideas to take back with me and try. Having previously attended college in Washington state, it was also wonderful to return to the beautiful Pacific Northwest for a week.

Ultimately, I plan to go into biology rather than illustration as my primary career, but I hope that illustration might be a fulfilling side venture. I hope you enjoy the illustrations of mine I’ve included in this post, which are all of species found in Florida.

For more information on scientific illustration, visit the Guild of Natural Science Illustrators webpage, or Science-Art.com, where you can peruse the work of many of its members. There are also a number of blogs on science and art, such as this one, which has links to several other blogs on its homepage.

Hughes/ Kimbro (Hug-Bro) Labs Poster

Hughes-Kimbro Lab poster and t-shirt design – pen and ink

Green sea turtle – not actually an illustration, this is a sand sculpture I made on a beach (one of my more bizarre artistic hobbies)

Video: Wildlife Watching at the St. Marks Refuge

Rob Diaz de Villegas WFSU-TV

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Andy Wraithmell by GFBWT kiosk

Andy Wraithmell at the Great Florida Birding and Wildlife Trail kiosk at the St. Marks Refuge.

I want to thank my co-adventurers for joining me on what turned out to be a remarkably wildlife filled day.  Andy Wraithmell from Florida Fish & Wildlife set our itinerary for the day and picked the best spots for the best time. I elaborated on those locations and timing considerations in last week’s post (with a map), which you can read here. It was great to meet Lou and Betsy Kellenberger, who have a real love for the place, and Alicia Wellman,who live-tweeted our day for Florida Fish & Wildlife.  Thanks also to my production assistant, Alex Saunders, for the great photos, and lastly to Refuge Manager Terry Peacock for talking to us.

In the video I alluded to there being too many places, activities, and programs in the Saint Marks National Wildlife Refuge for what ended up being an almost seven-minute piece. Over the years, we’ve covered some of those and I’ll point you to a couple of videos we’ve done along with some additional online resources.

The Whooping Crane Migration Program

The most famous birds associated with the Refuge are the ones you’re least likely to see on a visit.  I did a segment the first year they flew in.  You can watch that video here.  Their struggles this year were well documented, and while the Operation Migration folks ended up having to winter this year’s class in Alabama, one member of that original 2009 class paired off with one of the Chassahowitzka cranes from that year (half go to St. Marks, the other to Chassahowitzka National Wildlife Refuge) and flew to a cow pasture in Tallahassee’s Southwood neighborhood.  That means that they are learning their traditional migration paths, which is hopeful for their future.

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Hiking in the Cathedral of Palms.

The Florida National Scenic Trail

We just recently did a video on the Trail’s Aucilla Sinks segment. Previously, Florida Trail Association’s Kent Wimmer had taken us to two very special spots in the Refuge: Shepherd Spring and the Cathedral of Pines. You can see shots of those at the end of the video above. You can see that full video here.

The St. Marks Lighthouse

We don’t have a video uploaded on the lighthouse, but there is some news regarding it.  The Refuge is in the process of taking ownership of the lighthouse from the Coast Guard.  The plan is to open a bookstore on the ground floor, though the general public will still not be allowed to climb to the top and utilize what should be a sweet vantage point for photographers and (ahem) videographers.

Educational Programs

We see the new educational building and Terry Peacock talks about the number of students that participate in the Refuge’s education programs, but we don’t go into specifics. They offer 18 different programs and will work with teachers to meet their needs. Read more here.

The St. Marks National Wildlife Refuge Association

This group, led by their president, Betsy Kellenberger, coordinates volunteer efforts, classes, and field trips in the Refuge. Lou and Betsy, for instance, helped to build the Whooping Crane pens, which seems to me to be a neat way to be a part of that program. Visit the Association page here.

Music in the piece by unreal_dm and Andrea Pireddu.

Who’s that bird? Nature Viewing app review

Rob Diaz de Villegas WFSU-TV
On Sunday, May 13 at 10:00 AM/ET, you can watch an encore airing of our latest EcoAdventure in the Saint Marks National Wildlife Refuge, a gateway site on the Great Florida Birding & Wildlife Trail.  It lived up to its gateway status with a range of migratory shore birds and residents, and scaly and furry critters.  Dimensions, on WFSU-TV. 

IGOR chip- human appreciation 150I’m not a smartphone guy, though I can see the attraction.  Since we’ve started with In the Grass, On the Reef, I’ve seen their value in an outdoor setting.  Dr. Randall Hughes and Dr. David Kimbro use them to monitor the weather when they’re at their sites.  That’s handy when you’re a twenty or thirty-minute kayak from your car and you see dark clouds in the distance.  There’s a connectivity with a smartphone that let’s you take care of business while on location.  And it allows you to travel with world of information right in your pocket.

The Nature Viewing Along the Great Florida Birding and Wildlife Trail app (search Nature Viewing app) is available for iPhone, iPad, and, just recently, Android- for free.  Its goal is to help you identify birds, butterflies, and wildflowers that you might see in Florida.  I’m not a bird expert, but I like being outdoors and I always see them.

So how does it work?

We’ll start with this photo taken on our Refuge shoot by WFSU’s Alex Saunders.  I remember that he was excited to find and actually shoot this bird, but when I got back I had no idea what species it was. So I borrowed an iPad and installed the app.  It’s 418 MB, which is something to keep in mind if you have space issues.  It’s size likely has to do with the hundreds of photos of plant and animal species included.

This is what you see when you turn on the app:

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I select the bird.  When I do, I see the following options on the bottom row:

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The buttons on the bottom are the filters.  First is class of bird (wading bird, shore bird, water bird, raptor, etc.).  Next is the season in which you saw the bird- important as birds migrate seasonally.  Next is size, and then color.  The last button lists all birds, which gives you a different option for browsing.  As you see in the screen grab above, I selected type of bird first, and these options appeared.  You can hold down any button for more information.  Here I clicked on the duck icon:

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From this description, I see that this icon applies to all water birds, not just ducks.  The bird in Alex’s photo is in a tree, but isn’t a woodpecker or predatory bird, so I select perched bird.

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After that, I select season, which was spring.

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Then I select size, which I at first found confusing, as it associates size with specific birds. Hold down each option to see the size in inches.  Even with that, it can be hard to tell from a photo.  I selected mockingbird size. Next is color:

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The bird is blue, white, and red. Selecting the colors can be tricky, and what I found is that sometimes it’s better to omit colors that appear as a band or a streak, as it’s not always recognized. So I just select white and blue. Once I do, I see there are three matches on the upper right of the screen. I click to see the matches, and get the following possibilities:

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I don’t think that this bird is a type of jay. So I remove options. Why do I do this? With every additional filter you add, there are less options. Sometimes it’s better to omit some information so that you have a slightly larger list to look at. With less options, I get this:

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The Belted Kingfisher looks close. But there are two photos with this entry, and the second photo looks like this:

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So the female has the red band, and I have my match. I’ve found by playing with this that when it comes to color, it’s better to keep it simple (less colors) as color variations for juveniles and females aren’t always accounted for.

_DSC4240_e2_aAt the end of the day, I think that this is a useful app to review photos you’ve taken in the field, or if you’re by the bird and it doesn’t look like it will fly or swim away (as they tend to do when you photograph or video them. They know what’s up). The more I play with the app, the easier it gets, and I do recommend playing with it and getting a feel for it before trying it in the field. If you’re reviewing photos, keep in mind that colors look different in different lighting. For instance, I first tried to identify the kingfisher from this photo taken after it took off. You’ll notice that the blue looks black, and I had less perspective on a size.

Wakulla SpringsThe app relies a lot on how you perceive things, so if you have trouble guessing sizes, you can either try a few options or leave that off.  Same with color; if a bird has two or three colors and you’re not having luck, try picking the most predominant and omit the others.  And then there’s the type of bird.  I was trying to identify what ended up being an anhinga from a photo Alex took at Wakulla Springs.  It looked like a wading bird to me, but it’s classified as a water bird.  Looking at it again, I notice the short legs, where wading birds are large birds with long legs.

If you’re interested in birds, it’s worth a try.  It’s a free download, and even if you’re like me and aren’t very knowledgeable, you can play with it, browse the master list of birds, and learn something from it.

Download the app from the Apple store here.

Download the app for Android here.

Pea Crab Infestation!

Tanya Rogers FSU Coastal & Marine Lab

IGOR chip- biogeographic 150Serendipitous results are surely one of the most rewarding parts of experimental research. This past winter, I spent many weeks processing various frozen components of great cage experiment of last summer, including the several hundred spat tiles placed inside the different cages at all sites along the coast. It was while delicately measuring and shucking these little spat that I made one such unanticipated finding: Our oyster spat, unbeknownst to us, had become infested with pea crabs.

Pea crabs at various stages of development. The ones in the center are young crabs, as they appear in the stages immediately following infection of an oyster. The ones on the right are older, harder-carapaced crabs (most likely males, which may leave their hosts in search of oysters harboring females). The crab on the left is a mature female. The developing, orange-colored gonads are visible through the female’s thin carapace. Since mature females never leave the their host oyster, their carapaces (shells) are very soft and thin. This makes them very… squishy and pea-like.

You might have had the surprise of finding an oyster pea crab (Zaops ostreus) while shucking an oyster yourself. These small crabs live inside oysters and are a type of kleptoparasite, meaning they steal food from their hosts. An oyster gathers food by filtering water over its gills, trapping edible particles on its gills, and carrying those particles to its mouth using cilia (tiny hairs). Pea crabs sit on the gills and pick out some of the food the oyster traps before the oyster can consume it. By scurrying around inside oysters, pea crabs can also damage the gills mechanically. The pea crabs, like most parasites, don’t kill their hosts, but they can certainly affect the oysters’ overall health.

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A gravid (egg-bearing) female pea crab next to the oyster spat in which she was living. The female, like most crabs, carries her eggs until they hatch, and then releases her larvae into the water. The baby crabs, when ready, will locate a new oyster host by smell.

As I was processing the oyster spat from all of our experimental sites (Florida to North Carolina) for survivorship, growth, and condition, I began to notice a surprising number of pea crabs living inside them and started to keep track. What’s interesting was not so much that the oysters had pea crabs, but that the percentage of oysters infected with pea crabs varied geographically. For instance, only about 25% had pea crabs in St. Augustine, Florida, whereas over 70% were infected at Skidaway Island, Georgia. Keep in mind that these spat all came from the same source and the same hatchery, so they all had the same starting condition. What’s more, I found that spat in Georgia which had naturally recruited to the tiles from the surrounding waters (of which there were quite a lot, and for which I also processed condition) rarely had pea crabs. Only about 5% of the recruits had pea crabs at Skidaway Island, Georgia. Why is there this huge difference in infection rate? Do the local oysters know something that the transplants don’t? How do these patterns in pea crab infection relate to other geographic patterns we’re finding? How does pea crab infection affect oyster condition? These and many more questions await to be addressed in further analyses and future experiments.

Sounds of the Oyster Reef

Rob Diaz de Villegas WFSU-TV

IGOR chip_ predators_NCE 150Imagine you’re watching a slasher movie starring mud crabs as the protagonists.  A mud crab leaves the party in the muck under the oyster reef, where the other crabs are chomping down juvenile oysters.  As he pokes his head out from between a couple of shells, you hear a drumming sound and you shout at the screen “Don’t go out there!”

It’s fun to anthropomorphize some of the freaky looking residents of an oyster reef.  But these are the realities of living within the ecology of fear.  Predator cues have a definitive impact on how the smaller, intermediate consumers such as mud crabs behave.  That’s what David Kimbro, Randall Hughes & co. are studying in Alligator Harbor and at their sites across the southeast.  Large predators send certain cues to their prey- perhaps a certain way they move in the water, perhaps.  When the prey species sense that the predators are near, they cease activity- including the eating of juvenile oysters.  That is how large predators help maintain a healthy oyster reef- they make intermediate consumers (mud crabs) eat less of the basal species (oysters, the foundation of the oyster reef habitat). Continue reading

Paint Every Feather

Wednesday, January 18 at 7:30 PM/ ET, watch WFSU’s latest EcoAdventure on dimensions, as Green Guides George Weymouth, Jim Dulock, and Cynthia Paulson guide us down the Wacissa River.  Birds, springs, and art- you can read more about that below, and enjoy this video looking at how George- a well known painter and sculptor in our area- creates his hyper-realistic works.

Rob Diaz de Villegas WFSU-TV
George Weymouth paints black-necked stilts

In the interest of being intensely accurate, George's painting area is surrounded by field guides and nature magazines.

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George Weymouth is telling me how he is going to paint the ripples caused by a black-necked stilt’s (Himantopus mexicanus) wading in a river, and how the the avian subjects of his painting reflect over the disturbed water.  When he’s done getting the shape of the bird’s body, and the general coloration, he’ll add various feathers- primaries, secondaries, and tercials; all located at the anatomically appropriate places on its body.  Something occurred to me as I edited this footage into the above video:  when I had accompanied George down the Wacissa River the week before, he was looking at whole different world than I was.  A man who can accurately paint every feather on a bird is likely to have a unique perspective.

Continue reading

Horse Conchs Rule the Seagrass Bed

In the Grass, On the Reef: Testing the Ecology of Fear

Premieres on WFSU-TV Wednesday, June 29 at 7:30 PM, 6:30 CT.  In high definition where available.

Rob Diaz de Villegas WFSU-TV

IGOR_chip_predators_NCE_100This clip is a short segment on one of the predators featured in this program: the horse conch.  It’s practically an ecosystem onto itself, as you can see in the video’s poster frame above.  Barnacles, crepidula, bryozoans, and other marine creatures that affix themselves to hard surfaces settle on its shell.  In the video you’ll see its bright orange body as it roams the seagrass beds of the Forgotten Coast.  And you’ll see it eat another large predatory snail, the lightning whelk.

Continue reading

Photo Feature: Bedazzled Predator

Rob Diaz de Villegas WFSU-TV

Horse Conch shell covered in bivalves

IGOR chip- habitat 150It kind of looks like one of those vintage ’80’s jackets adorned with mirrors and sequins- mollusk style.  This horse conch’s got a little bit of everything on it, the result of an interesting reversal of roles in this seagrass bed on Bay Mouth Bar.

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