Tag Archives: marine biology

Crown Conchs Overrun Saint Augustine Reefs


Scanning the photo, you can see crown conchs crawling about this Saint Augustine reef. Crown conchs are a normal sight on Florida reefs, but not to the extent seen here. David has tasked Hanna Garland with looking into this very localized phenomenon and its relationship with increasing reef failures.

Dr. David Kimbro FSU Coastal & Marine Lab

IGOR chip_ predators_FX 150Last week I detailed a recent trip to St. Augustine, ending the post with a mention of a side project being embarked upon by my lab there.  Throughout the past year, we’ve noticed that our St. Augustine study site was loaded with tons of crown conchs. Although crown conchs are ubiquitous in Florida, they are abnormally abundant on our St. Augustine reefs and our St. Augustine reefs are mostly dead. All our other sites have relatively healthy looking oyster reefs and few crown conchs.

But a few miles north of our monitoring reefs, we find absolutely no crown conchs and the health of the oysters is great. Because crown conchs, as has been shown by the research of our very own Doc Herrnkind, love eating oysters, it’s easy to conclude that crown conchs have mowed down all the oysters on our monitoring reefs. But why are they restricted only to our monitoring reefs? Is there a predator of conchs present north of reefs but that is absent on our monitoring reefs? Perhaps the environment has changed in a way that killed all of the oysters and the crown conchs are just cleaning up the mess.


Proboscis out (protruding from the bottom of the snail), a crown conch heads towards a clump of oysters. The conch will use its proboscis to pry open the oyster shell and suck out the meat.

Luckily, Hanna has agreed to enter my lab as a graduate student to tackle this research project. So, she spent a number of days collecting coarse-scale data on the spatial extent of this conch-oyster pattern, consulting with locals about when this pattern developed, and talking with an oceanographer about how to learn whether and how the physical environment has lead to this pattern. In a forthcoming post, I’ll let Hanna fill you in on the details of this new project, which we will be implementing quickly. This is really important to the local community because our monitoring reefs and the conch infested area used to be the most productive area in St. Augustine for harvesting oysters and rearing clams. But now, aquaculture leases here have been abandoned and a very large population of crown conchs appears to have taken up residence.

Stay tuned for Hanna’s post later this week, she’ll go into a little more detail on what we’re doing.

David’s research is funded by the National Science Foundation.
On Wednesday, June 29 at 7:30 PM/ET, WFSU-TV premieres the In the Grass, On the Reef full length documentary. David and Randall guide us through the world of coastal predators (like crown conchs). Top predators maintain important ecosystems like salt marshes and oyster reefs- but the manner in which they do this may not be confined to eating prey.  Tune in to find out more!

The New Predator Experiment

Dr. David Kimbro FSU Coastal & Marine Lab

IGOR_chip_predators_NCE_100IGOR chip- biogeographic 150Hey folks,

Where did my winter of catching up on work go? And why is spring quickly hurtling into summer? YIKES!

…Okay, I feel better. All of us here feel a little behind on things, because this past winter and spring have been full of other projects (in addition to the oyster one) such as investigating how the oil spill affected marshes throughout the west coast of Florida and examining what all of those snails are up to out on Bay Mouth Bar. But now that summer is almost upon us, it’s time to move all hands on deck back towards the ambitious summer oyster goals.

Environment versus Predation

Environmental vs. Predator Effects.

To lay the ground work for this summer’s oyster research, I spent a few days in St. Augustine, Florida, which is where we will conduct our colossal field experiment. As a recap of the oyster objectives, we spent year 1 monitoring the oyster food web at 12 estuaries between Florida to North Carolina. Well, we found some cool patterns regarding the food web and water-filtration/ nutrient cycling services on oyster reefs (see the 2010 wrap-up). So, now we want to know what’s causing those patterns. Are differences in oyster reefs between NC to FL due purely to differences in water temperature, salinity, or food for oysters (phytoplankton)? Or, do we have a higher diversity of predators down south that are exerting more “top-down” pressure on the southern reefs? Or, is it a combination of the environment and predators? 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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Coastal Critters and More at the FSUCML Open House

Rob Diaz de Villegas WFSU-TV

IGOR chip- human appreciation 150

When I heard it was supposed to rain on Saturday, I was a little bummed. I was planning on taking the family to the FSU Coastal and Marine Lab Open House followed by the FSU Spring Game (where my 12-week old son could attend his first football game featuring my two favorite teams).  Luckily, the storms rolled through early in the morning and made for a nice day at the coast.

P1030210I started off by visiting my friends at the Randall Hughes and David Kimbro labs.  Robyn and Emily held down the fort in the Hughes lab, where kids watched a very peculiar sport.  As Randall’s previous post promised, there were indeed periwinkle snail races.  As you can see from the photo at the right here, the snails were color coded (white and blue) and numbered so that they could be told apart.  Some crown conchs (periwinkle predators) were placed into the tubs to give the smaller snails some incentive to climb.  The fastest climbers won.  Let’s watch part of one race:

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What are those new images that are popping up on the blog?

Dr. Randall Hughes FSU Coastal & Marine Lab

If you’re a regular reader of the blog, you’ll realize that we often talk about similar research questions or ideas in the context of different projects. As David mentioned in his description of the Baymouth Bar project, this overlap is usually intentional: as ecologists, we’re interested not only in the specific habitats that we study, but also in the underlying factors that affect these habitats and the valuable services that they provide to we humans.

It may appear at times that we’ve been covering a diverse array of topics, and while this is true, all of these topics are interconnected- a web of topics centered around a couple of central themes. The diagram below is the map that shows where every post-topic fits into these central themes. Even the artists, writers, and photographers we occasionally feature have their place amongst ecological processes like sedimentation and the non-consumptive effects of predators. Every post from here on out will have one of these icons on it- if you don’t know what the icon means, just click on it and you’ll be back at this figure with an explanation:

In the Grass, On the Reef master plan

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Who am I? Identity In the Grass

Katie Lotterhos FSU Department of Biological Sciences, FSU

IGOR chip- biodiversity 150

When we look at a salt marsh, we see thousands of stems of cordgrass. But in reality, the coastline may be made up of only a few different genetic individuals.  This is because Spartina can spread by growing clones of itself,  with the exact same genetic code (a genotype). Why does it matter if we know whether or not a salt marsh is made up of one or many different genotypes?  Well, different genotypes will have different abilities to resist pests or disease, or they may be tastier to eat for the little marsh critters like snails and grasshoppers.  Since some genotypes will be better than others in different situations, we care about genetic diversity because it can be a buffer against an uncertain environment.

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What do ecologists do for fun?

Dr. Randall Hughes FSU Coastal & Marine Lab


IGOR chip- employment 150

Last week, David and I (along with all the students and technicians in our labs, and over 500 other ecologists/students) attended the Benthic Ecology Meeting in Mobile, AL. You may well wonder – what goes on at a meeting of ecologists? And what does “benthic” mean anyway?

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Welcome to Bay Mouth Bar!


Cristina Lima Martinez FSU Coastal & Marine Lab

Dozens of different mollusk species interact within a relatively small area at Bay Mouth Bar, from all manner of bivalves to the predatory snails that eat them (and each other).

First Impressions
As soon as you arrive to BMB, it is easy to imagine and feel the same curiosity and fascination that Robert Paine brimmed with when he first immersed himself in the sand bar fifty years ago.

If someday you have the opportunity to visit BMB at low tide, then you would receive much pleasure in looking at 40000 m2 of sand, full of awesome critters!  Twenty minutes by kayak, that’s it!

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Revisiting the Ecology of Fear

Dr. David Kimbro FSU Coastal & Marine Lab

IGOR_chip_predators_NCE_100Since I started working at FSU’s marine lab, I have frequently cast longing looks at a local study system that hasn’t been examined in over 50 years. Back in the 1960s, the world’s most famous ecologist (Bob Paine) was a post-doctoral researcher working at FSU’s Marine Lab.  It was at this time and place where he began developing some of the concepts that would transform the field of ecology. Continue reading

Return to the field

Dr. Randall Hughes FSU Coastal & Marine Lab

IGOR chip- biodiversity 150A sure sign of spring for me is an increase in time in the field. (Robyn and Emily would probably disagree with me, since they have been out in the field regularly throughout the winter!) I have been in the lab or office since December, which feels like a long time, and I’m really looking forward to getting back in the field. I find it is so much easier to come up with new research questions and develop insights into what the animals and plants are doing out there when I’m actually there with them. I guess that makes sense!

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