All posts by Tanya

About Tanya

Tanya Rogers was Dr. David Kimbro’s research assistant and worked primarily on the collaborative study of oyster biogeography and ecosystem processes featured in this blog. She has a Bachelor of Science in Biology from the University of Puget Sound in Washington, and has done undergraduate research at Bodega Marine Laboratory and Friday Harbor Laboratories. She is interested in marine community ecology and conservation, as well as natural history and scientific illustration. She is now a graduate student for Dr. Kimbro at Northeastern University.

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Notes From the Field: Panama, Where Oysters Grow on Trees

A couple of months ago, we looked at the increasing number of mangroves surviving north of their range in Gulf coast marshes and wondered how it might change that habitat. On a research trip to Panama, Tanya Rogers got a good look at how mangroves interact with many species found in North Florida. There, oysters grow on trees.

Tanya Rogers FSU Coastal & Marine Lab/ Northeastern University

Installing predator exclusion cages in the rocky intertidal at Punta Culebra, on the Pacific coast of Panama.

Travel 1,100 miles due south of Miami, and before you know it you will collide with the Caribbean coast of Panama. Take a look around these shores and what will you find? Not just coral reefs as you might expect, but also seagrass beds, mangrove forests, and oysters – many of the same species, in fact, that are found in Florida, but arranged a bit differently. What are these oysters, seagrasses, and mangroves up to in the tropical parts of the world?

For a brief stint this summer I worked with Dr. Andrew Altieri at the Smithsonian Tropical Research Institute in Panama, exploring ecological questions similar to those we’ve been investigating in Florida. Dr. Altieri, much like my advisor, Dr. Kimbro, is interested in the ecology of marine communities, particularly the role of foundation species and the effects of environmental stress vs. consumers/predators in determining what grows where. In the mangroves, as well as on the rocky shores of the Panamanian Pacific coast, I helped set up several experiments using the same sort of experimental techniques as we used in Florida (cages, transplantation, etc.) to answer questions about species interactions in tropical environments. I hope I have the opportunity to return to Panama in the future as part of my graduate research.

Setting up a mangrove root transplant experiment in Bocas del Toro, on the Caribbean coast of Panama.

One interesting thing about the oysters in Panama (on the Caribbean side anyway) is that they grow almost exclusively on mangrove prop roots, and instead of one species, you can find up to five oyster species co-occurring. The oysters grow near the water’s surface, and below them the submerged roots can host an astonishing diversity of other marine invertebrates, including sponges, tunicates, anemones, and tube worms. I found it fascinating to swim below the mangroves, the roots like a maze of stalactites bedazzled with life of all colors and textures, fish darting through the labyrinth, the occasional crab deciding to take refuge on your head. Be on the lookout though for stinging box jellies, for they also enjoy these galleries. Just as in Florida, the mangroves and seagrass beds (which often border the mangroves), are important nursery habitats for juvenile fishes, which later venture out to the coral reefs.

A suite of co-occurring foundation species in Bocas del Toro: corals, seagrasses, mangroves, and oysters (growing on the mangrove roots).

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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Predator Diversity Loss and Bay Mouth Bar: The Next Stage

David and Randall’s NSF funded oyster study looks to understand how predators control oyster eating animals such as mud crabs and crown conchs. But this dynamic isn’t exclusive to oyster reefs. They are also investigating how predators might help maintain salt marshes and seagrass beds. In their seagrass bed studies, they have focused on a system loaded with predators: Bay Mouth Bar.
Tanya Rogers FSU Coastal & Marine Lab

Tanya RogersThe very first time I drove from Tallahassee to the FSU Coastal & Marine Lab I saw a black bear crossing the Crawfordville highway. No joke. This was in June of 2010, and I had just driven 5 days and 2800 miles from San Francisco to the Florida panhandle to take up my new job on the Gulf Coast. I had just finished college in Washington state, and I had never before been to the Southeast. What sort of wild place had I ended up in?

IGOR chip_ predators_NCE 150IGOR chip- biodiversity 150A very wild and unique one it turns out, and one I’ve come to know better working for the past few years as a research technician for Dr. David Kimbro in the fascinating coastal habitats of this region. Primarily I’ve been traipsing around oysters reefs across the state for the collaborative biogeographic oyster study (now drawing to a close), but for the past year or so I’ve also been managing our side project in the Bay Mouth Bar system, a sandbar and seagrass bed near the FSU Marine Lab. Bay Mouth Bar is a naturalist’s playground filled with surprises and an astonishing diversity of marine creatures that never ceases to amaze me. It is also a unique study system with an intriguing history out of which we can begin asking many interesting questions. This coming fall I’m excited to be starting as Dr. Kimbro’s Ph.D. student at Northeastern University, and for part of my dissertation I’ve decided to conduct some new experimental research this spring and summer out on Bay Mouth Bar.

Horse conch consuming a banded tulip snail on Bay Mouth Bar.

A horse conch in Tanya’s experiment consuming a banded tulip snail.

Bay Mouth Bar is known for its especially diverse assemblage of large predatory snails, which the ecologist Robert T. Paine conducted a study of in the late 1950’s. In 2010, we began surveying the snail community on the bar, interested in what changes might have occurred in the 50 years since Paine’s time, a period during which very little research had been done in this system. I began synthesizing some of the data we’ve gathered, as well as talking to some of the long-term residents of the area. So what has changed on Bay Mouth Bar since the 1950’s? A number of things in fact:

  • Of the 6 most common predatory snail species, 2 are no longer present: the true tulip and the murex snail.
  • The number of specialist snails (like the murex, which only eats clams) has declined relative to the number of generalist snails (those that eat a variety of prey, like the banded tulip).
  • There has been a drastic reduction in the overall area of the bar and changes in the coverage seagrass, specifically the loss of large meadows turtle grass (Thalassia testudinum).
  • Surface dwelling bivalves (e.g. scallops, cockles), once enormously abundant, are now very rare.
True Tulip and murex Snails (no longer found at Bay Mouth Bar)

The two main snail species no longer found at Bay Mouth Bar, true tulip (The larger snail on the left, eating a banded tulip) and murex (right). The true tulip was, along with the horse conch, a top predator of the ecosystem, while the murex is a specialist snail, eating only clams.

Why is this interesting? Worldwide, we know that species diversity is declining as a result of human activities, that specialists are being increasingly replaced by generalists, and that consumer and predator species often face a disproportionate risk of local extinction. So what are the consequences of realistic losses and changes to biodiversity? Is having a diversity of predators beneficial (e.g. both horse conchs and true tulips) to an ecosystem as a whole? Do some species matter more than others? And how do the effects of predators depend on the type of habitat they’re in, given that habitats (like seagrasses) are also changing in response to the environmental changes? These are some of the questions I’m hoping to address in Bay Mouth Bar system, in which we have documented historical changes in predator diversity.

Tethered community in Tanya's Bay Mouth Bar experiment

One of communities in Tanya’s experiment. At the center are top predators reflecting either the current assemblage (a horse conch alone) or the historic assemblage (the horse conch and true tulip).  The predators are tethered to posts and given enough line to reach the lower level predatory snails (murex, lightning whelks, banded tulips, and Busycon spiratum) on the outside.  Those snails have enough line to get out of the large predator’s reach and forage for food.

This past week, I set up an experiment featuring a menagerie of snails tethered in different assemblages across Bay Mouth Bar. Some assemblages mimic the current assemblage, whereas others mimic the assemblage found on the bar during Paine’s time. These historical assemblages include the snail species no longer found there, which I collected from other locations where they are still abundant. Some assemblages have top predators (e.g. horse conchs) whereas others do not. Some are in turtle grass, others are in shoal grass. We’ll see how, over the course of the summer, these different assemblages affect the prey community (clams, mussels, small snails) and other elements of seagrass ecosystem functioning.

Music in the piece by Donnie Drost.  Theme by Lydell Rawls.

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

 

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Lab Creations Catalog: Some Holiday Gift Ideas

Tanya Rogers FSU Coastal & Marine Lab

Shopping for gifts this winter? May I suggest one of these unique Kimbro Lab inventions, available for a limited time:

 

The Aquaclaw:

Debuted by technician Evan after conveniently breaking his hand before a long stint of marine field work, this dual glove and zip tie hybrid can protect a non-removable cast from seawater and spray, while allowing for finger mobility and dexterity. Lightweight and available in an array of fashionable colors. (Not waterproof when fully submerged.)

 

 

Decopod Extracto-Bar

Need to extract stone crabs from their burrows, but worried about losing a finger? Try out Evan’s latest invention for prying stubborn crustaceans from their subterranean homes. Forged of the highest quality rebar available, this tool is optimally angled for maximum crab-removal effectiveness. Highly durable, with antique rust finish and a handle for increased leverage.

 

Z-Pendant

These stunning olive-green pendants are artfully fashioned by Tanya from leftover quantities of our favorite marine epoxy. Monofilament chain included. Inquire about her complete line of z-spar jewelry and sculpture. Custom pieces available.

 

Happy Holidays!

We hope you enjoyed this last little bit of fun for the year.  When we come back in 2013, Randall Hughes and David Kimbro get serious about animal behavior.  The consequences of oyster, crab, and conch behavior could mean life or death, or life in fear.  And as research begins in the decimated oyster reefs of Apalachicola Bay, they’ll put their theories about predators to the test.

We want to hear from you! Add your question or comment.

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

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Notes From the Field: Leashing Your Clams

Tanya Rogers FSU Coastal & Marine Lab

IGOR chip_ predators_NCE 150It’s a problem commonly faced by field biologists: You want to put some particular critters out in the field in various places, but how do you keep them from getting swept away or wandering off too far, and how do you ever find them again later to see how they did? Behold the tether! So long as tethers are designed not to interfere too much with the animals’ natural behavior (walking around, burrowing, etc), leashing them to a fixed object is generally a good way to relocate them (provided you study something like crabs or snails and not lions or bald eagles). The other fun benefit of tethering marine invertebrates: you can take them for walks (albeit slow ones).

I recently conducted an experiment in which I put tethered baby clams (sunray venus and quahog, about 12 mm long) out on Bay Mouth Bar to see how their growth, survivorship, and burial depth was affected by (1) their location on the bar (NE, SW, SE, NW) and (2) the type of habitat the clams were in (sand, shoal grass, turtle grass). I checked on the clams a month later: some were still alive and growing, others were dead with clues indicating their likely cause of demise – gaping shell with no damage (stress), cracked shell (eaten by crab), drill hole in shell (eaten by predatory snail). My preliminary analysis suggests that survivorship and causes of death varied between habitat types. Next I hope to do a similar sort of study with tethered snails on Bay Mouth Bar.

We want to hear from you! Add your question or comment.

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

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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)