The WFSU Ecology Blog
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The WFSU Ecology Blog

  • Home
    • About
    • EcoAdventures
      • Kayak and Canoe Adventures
      • Hiking
      • Wildlife Watching
    • Observations From the Field
      • White Pelicans Visit Dr. Charles L. Evans Pond in Tallahassee
      • An April Walk at Ochlockonee River WMA
      • Nesting Raptors at Honeymoon Island State Park
    • WFSU Public Media Home
  • Documentaries
    • EcoCitizen Show | Seasons in South Tallahassee
    • Red Wolf Family Celebrates First Year at the Tallahassee Museum
    • Roaming the Red Hills
    • Oyster Doctors
    • Testing the Ecology of Fear
    • EcoShakespeare
    • Stories from the Apalachicola
    • Classic WFSU Ecology Documentaries
  • Habitats
    • Estuaries
      • Oyster Reef
        • The Effects of Predators and Fear on Oyster Reefs
        • Apalachicola Oyster Research
        • Animal Species in a North Florida Intertidal Oyster Reef
        • Oyster Reef Ecology | On the Reef
      • Salt Marsh
        • In the Grass- Salt Marsh Biodiversity Study
        • Plants and Animals of a North Florida Salt Marsh
        • Salt Marsh Ecology | In the Grass
      • Seagrass Bed
        • Predatory Snails, and Prey, of the Bay Mouth Bar Seagrass Beds
      • In the Grass, On the Reef Glossary
    • Waterways Big and Small
      • Aucilla/ Wacissa Watershed
      • Apalachicola Basin
        • Apalachicola Bluffs and Ravines | Virtual Field Trip
        • The Age of Nature Screening & Discussion | The Future of the Apalachicola
        • Apalachicola River and Bay
        • Apalachicola RiverTrek | Kayaking, Camping, & Hiking the River Basin
    • Longleaf Pine & Fire Ecology
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      • The Seasonality of Bees (and Bee Plants) in North Florida
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      • The Case for Weeds, Our Unsung Florida Native Plants
      • Devil’s Walkingstick: Your New Favorite Thorny Pollinator Plant?
      • Florida Native Milkweed | Tips for Growing Your Monarch Friendly Garden
      • Mistletoe | A Parasite for the Holidays (But Maybe We Like it Anyway?)
    • Florida Friendly Seasonal Planting Guide
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    • Gardening Web Resources

The Effects of Predators and Fear on Oyster Reefs

by Rob Diaz de Villegas May 19, 2010
The Effects of Predators and Fear on Oyster Reefs

Predators and prey on oyster reefs over hundreds of miles of coastline.

IGOR chip_ predators_NCE 150Dr. David Kimbro, Dr. Randall Hughes and their colleagues study predator-prey relationships. Those prey species are often consumers of ecosystem building species such as oysters and marsh cordgrass, and slight changes in the relationships between predators and consumers can have huge consequences for the salt marsh and oyster reef habitats.  By eating and scaring consumers, predators can have a positive effect on  ecosystems.  What David and Randall wanted to know is, how consistent is this effect in different locations?  With that in mind, they and their colleagues embarked on a massive NSF funded study that spanned several states and hundreds of miles of coastline.

Oyster ReefNutrients and Oysters
To understand what’s at stake, we look at an important service provided by oysters.  In this video, David breaks down the complicated relationship between oysters and nutrients.  All living things need nitrogen, but too much of a good thing can have devastating effects.  Oysters can help, if they aren’t scared.

Spat settled on an OysterFear and Oyster Choices
Oysters make choices.  They pick a place to live, and they choose when to eat.  Oysters can also be scared.  David and Randall explain why an oyster’s fear can keep it from providing valuable ecosystem services.

Mud CrabPredators Use Fear to Benefit Oysters
Oysters aren’t the only ones who get scared on the reef. Predators benefit an ecosystem by eating the animals that eat habitat building plants, or habitat building animals like oysters.  Just like consumers can scare oysters and alter their behavior, consumers are in turn scared by larger predators.

Spat Tile from the Tile 2.0 ExperimentTile 2.0
So how do you measure the effects of fear and predation over hundreds of miles of coastline?  One way is to look at how a young oyster grows.  David, Randall & co.’s spat tile experiments let them measure this growth in a variety of conditions.

Mud Crab Hearing TestMud Crabs Can Hear
One of an oysters primary consumers is the mud crab.  Until just recently, David and Randall’s experiments were based on mud crabs receiving chemical signals that alerted them to the presence of predators and which caused them to change their feeding behavior.  A partnership with WFSU-TV set this research on a surprising new path.

Predatory Snails found on oyster reefsPredatory Snails Overrun Reefs
Dr. David Kimbro is starting to see a pattern across Florida oyster reefs affected by loss of freshwater input.  Is the prevalence of oyster eating snails the cause or merely a symptom of oyster reef decline?  (Read more about David’s Apalachicola Bay research here).

David and Randall’s study is funded by the National Science Foundation.

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iNaturalist

iNaturalist became a part of the WFSU Ecology Blog during the EcoCitizen Project in 2019.  Since then, we’ve used it to help identify the many plants and animals we see on our shoots.  And on the Backyard Blog, we show how it can be used to identify weeds and garden insects, to help figure out what’s beneficial or a possible pest.  Below is the iNaturalist profile belonging to WFSU Ecology producer Rob Diaz de Villegas.

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My Garden of a Thousand Bees features renowned wildlife filmmaker Martin Dohrn, who, with the world in lockdown during the summer of 2020, turned his exceptional macrophotography filmmaking skills on his own tiny backyard and the surprising number of wild bee species that live there.

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