by Les Harrison | Mar 9, 2018
The common nine banded armadillo scurrying across the lawn.
Photo: Les Harrison
The first light of morning can reveal random pockmarks in what had been the perfect lawn the previous evening. The culprit is not likely the neighborhood teenager with a reputation for inappropriate practical jokes.
The offender usually is the nine-banded armadillo, sometimes referred to as a Florida-speed-bump or Possum-on-the-half-shell. In addition to manicured landscapes, they also encroach in natural areas and destroy sensitive habitats.
Armadillos eat adult insects and larvae, but also quail and turtle eggs. They incessantly dig holes in their search for food, many times uprooting plants in their food search. Their foraging holes are approximately one to three inches deep and three to five inches wide.
Using insecticides in landscapes to decrease the armadillo food supply is not guaranteed, but may help reduce the digging. In cases where there is a large, and always ravenous, armadillo population this reduction of food may increase digging activity as they search more diligently for a smaller food supply.
Another consideration is all chemical treatments have to be reapplied on a permanent basis for long term control. Always read and follow label instructions for safe use of insecticides.
Armadillos rest in a deep burrow during the day and are usually active after dark. Burrows openings are approximately seven to eight inches in diameter, about the size of a one-gallon plastic jug, and up to 15 feet in length.
This exotic invasive may burrow under driveways, foundations and patios potentially causing structural damage. Additionally, their burrows in pastures pose a potential leg-injury hazard to large wildlife and livestock.
Several live-trapping techniques can be used to capture armadillos as they exit of their burrows. Because armadillos are nocturnal, trapping techniques designed to capture them as they emerge from their burrows should be applied late in the afternoon and checked several hours after darkness.
Fencing is another option to discourage the presence of armadillos. Relocating captured animals is illegal and not recommended because it only transfers the problem elsewhere and can spread this problem species.
Fossil records indicate the armadillo’s ancestors were as large as modern-day rhinos. One can only imagine what front yards would look like if they still existed.
by Rick O'Connor | Jan 19, 2018
In the last article, we discussed what phytoplankton are, what their needs were, and their importance to marine life throughout the Gulf and coastal estuaries. In this article, we will discuss the different types of phytoplankton found in our waters.
The spherical shape of the centric diatom.
Image: Florida International University
Marine scientists interested in the diversity and abundance of phytoplankton will typically sample using a plankton net. There are a variety of different shapes and sizes of these nets, but the basic design would be funnel shaped with a sample jar attached at the small end of the funnel. The plankton net would be towed behind the research vessel at varying depths for a set period of time. All plankton collected would be analyzed via a microscope. According to the text Identifying Marine Phytoplankton (1997) there are at least 14,000 species of phytoplankton and some suggest as many as 120,000. Most of these, 12,000-100,000, are diatoms, one of five classes of marine phytoplankton. The majority of the phytoplankton fall into one of two class, the diatoms and the dinoflagellates.
Diatoms are typically single celled algae encased in a clear silica shell called a frustule. The frustule can come in a variety of shapes, with or without spines, and many resemble snowflakes – their quite beautiful. They are found in the bay and Gulf in great numbers, as many as 40,000,000 cells / cup of seawater. They are the dominate phytoplankton in colder waters and are most abundant near upwellings. These are the “grasses of the sea” and the base of many marine food webs. When diatoms die, their silica shells sink to the seafloor forming layers of diatomaceous earth, which is used in filters for aquariums and oxygen mask in hospitals.
Dinoflagellates differ from diatoms in that they produce two flagella, small hair-like projections from the algae that are used for generating water currents and movement. Their shells are not silica but layers of membranes and are called thecas. Some membranes are empty and others contain different types of polysaccharides. Dinoflagellates are more abundant than diatoms in warmer waters. There are about 2000 species of them. One type, Noctiluca, are responsible for what locals call “phosphorus” or bioluminescence. These dinoflagellates produce a blue-ish light when disturbed. Many see this when walking the beach at night. Their footprints glow for a few seconds. At night, boaters can see this as their prop wash turns the dinoflagellates in the water column. The bioluminescence is more pronounced in the warm summer months and is believed to be defense against predation. The light is referred to as “cool” light in that the majority of the energy is used in producing light, not lost as heat as with typical incandescent bulbs – hence the birth of the LED light industry.
The dinoflagellate Karenia brevis.
Photo: Smithsonian Marine Station-Ft. Pierce FL
Several dinoflagellates produce toxins as a defense. Some generate what we call red tides. In the Gulf of Mexico, Karenia brevis is the species most responsible for red tide. Red tides typical form offshore and are blown into coastal areas via wind and currents. They are common off the coast of southwest Florida but occur occasionally in the panhandle. Many local red tides are actually formed in southwest Florida and pushed northward via currents. Red tides are known to kill marine mammals and fish, as well as closing areas for shellfish harvesting.
Like true plants, phytoplankton conduct photosynthesis. Between the diatoms and dinoflagellates, 50% of the planet’s oxygen is produced. These are truly important players in the ecology of both the open Gulf and local bays.
References
Annett, A.L., D.S. Carson, X. Crosta, A. Clarke, R.S. Ganeshram. 2010. Seasonal Progression of Diatom
Assemblages in Surface Waters of Ryder Bay, Antarctica. Polar Biology vol 33. Pp. 13-29.
Hasle, G.R., E.E. Syvertsen. 1997. Identifying Marine Phytoplankton. Academic Press Harcourt Brace and
Company. San Diego CA. edited by C.R. Tomas. Pp. 858.
Steidinger, K.A., K. Tangen. 1997. Identifying Marine Phytoplankton. Academic Press Harcourt Brace and
Company. San Diego CA. edited by C.R. Tomas. Pp. 858.
by Carrie Stevenson | Jan 5, 2018
The ghost flower in full bloom. Photo credit: Carol Lord
Imagine you are enjoying perfect fall weather on a hike with your family, when suddenly you come upon a ghost. Translucent white, small and creeping out of the ground behind a tree, you stop and look closer to figure out what it is you’ve just seen. In such an environment, the “ghost” you might come across is the perennial wildflower known as the ghost plant (Monotropa uniflora, also known as Indian pipe). Maybe it’s not the same spirit from the creepy story during last night’s campfire, but it’s quite unexpected, nonetheless. The plant is an unusual shade of white because it does not photosynthesize like most plants, and therefore does not create cholorophyll needed for green leaves.
In deeply shaded forests, a thick layer of fallen leaves, dead branches, and even decaying animals forms a thick mulch around tree bases. This humus layer is warm and holds moisture, creating the perfect environment for mushrooms and other fungi to grow. Because there is very little sunlight filtering down to the forest floor, the ghost flower plant adapted to this shady, wet environment by parasitizing the fungi growing in the woods. Ghost plants and their close relatives are known as mycotrophs (myco: fungus, troph: feeding).
Ghost plant in bloom at Naval Live Oaks reservation in Gulf Breeze, Florida. Photo credit: Shelley W. Johnson
These plants were once called saprophytes (sapro: rotten, phyte: plant), with the assumption that they fed directly on decaying matter in the same way as fungi. They even look like mushrooms when emerging from the soil. However, research has shown the relationship is much more complex. While many trees have symbiotic relationships with fungi living among their root systems, the mycotrophs actually capitalize on that relationship, tapping into in the flow of carbon between trees and fungi and taking their nutrients.
Mycotrophs grow throughout the United States except in the southwest and Rockies, although they are a somewhat rare find. The ghost plant is mostly a translucent shade of white, but has some pale pink and black spots. The flower points down when it emerges (looking like its “pipe” nickname) but opens up and releases seed as it matures. They are usually found in a cluster of several blooms.
The next time you explore the forests around you, look down—you just might see a ghost!
by Carrie Stevenson | Nov 3, 2017
Red mangrove growing among black needlerush in Perdido Key. Photo credit: Carrie Stevenson, UF IFAS Extension
Discovering something new is possibly the most exciting thing a field biologist can do. As students, budding biologists imagine coming across something no one else has ever noticed before, maybe even getting the opportunity to name a new bird, fish, or plant after themselves.
Well, here in Pensacola, we are discovering something that, while already named and common in other places, is extraordinarily rare for us. What we have found are red mangroves. Mangroves are small to medium-sized trees that grow in brackish coastal marshes. There are three common kinds of mangroves, black (Avicennia germinans), white (Laguncularia racemosa), and red (Rhizophora mangle).
Black mangroves are typically the northernmost dwelling species, as they can tolerate occasional freezes. They have maintained a large population in south Louisiana’s Chandeleur Islands for many years. White and red mangroves, however, typically thrive in climates that are warmer year-round—think of a latitude near Cedar Key and south. The unique prop roots of a red mangrove (often called a “walking tree”) jut out of the water, forming a thick mat of difficult-to-walk-through habitat for coastal fish, birds, and mammals. In tropical and semi-tropical locations, they form a highly productive ecosystem for estuarine fish and invertebrates, including sea urchins, oysters, mangrove and mud crabs, snapper, snook, and shrimp.
Interestingly, botanists and ecologists have been observing an expansion in range for all mangroves in the past few years. A study published 3 years ago (Cavanaugh, 2014) documented mangroves moving north along a stretch of coastline near St. Augustine. There, the mangrove population doubled between 1984-2011. The working theory behind this expansion (observed worldwide) is not necessarily warming average temperatures, but fewer hard freezes in the winter. The handful of red mangroves we have identified in the Perdido Key area have been living among the needlerush and cordgrass-dominated salt marsh quite happily for at least a full year.
Key deer thrive in mangrove forests in south Florida. Photo credit: Carrie Stevenson, UF IFAS Extension
Two researchers from Dauphin Island Sea Lab are planning to expand a study published in 2014 to determine the extent of mangrove expansion in the northern Gulf Coast. After observing black mangroves growing on barrier islands in Mississippi and Alabama, we are working with them to start a citizen science initiative that may help locate more mangroves in the Florida panhandle.
So what does all of this mean? Are mangroves taking over our salt marshes? Where did they come from? Are they going to outcompete our salt marshes by shading them out, as they have elsewhere? Will this change the food web within the marshes? Will we start getting roseate spoonbills and frigate birds nesting in north Florida? Is this a fluke due to a single warm winter, and they will die off when we get a freeze below 25° F in January? These are the questions we, and our fellow ecologists, will be asking and researching. What we do know is that red mangrove propagules (seed pods) have been floating up to north Florida for many years, but never had the right conditions to take root and thrive. Mangroves are native, beneficial plants that stabilize and protect coastlines from storms and erosion and provide valuable food and habitat for wildlife. Only time will tell if they will become commonplace in our area.
If you are curious about mangroves or interested in volunteering as an observer for the upcoming study, please contact me at ctsteven@ufl.edu. We enjoy hearing from our readers.
by Les Harrison | Feb 4, 2017
Valentine’s Day is just a few days away and this month’s theme is evidenced by the color red. Red hearts, bows, roses (imported this time of year from South America) and candy in red boxes
This hue is not frequently seen in Wakulla County in the mist of winter’s grip, but this year azaleas bloomed in January. Still, red highlights in lawns, pastures and other open areas tend to attract attention.
Mature Column Stinkhorns are in striking contrast to most other local mushrooms. These were growing on the edge of the UF/IFAS Wakulla County Extension Demonstration Garden where wood chips are plentiful.
Photo: Les Harrison
The reason is simple. A mushroom species is taking advantage of the cool weather and available moisture.
Clathrus columnatus, the scientific name for the column stinkhorn, is a north Florida native which is common to many Gulf Coast locales. This colorful fungus has also been known by the common name “dead man’s fingers”.
The short lived above ground structure is usually two to six inches high at maturity. This area is known as the fruiting body and produces spores which are the basis for the next generation.
Two to five hollow columns or fingers project upwards above the soil or mulch. Coloration of the fruiting body can range from pink to red, and occasionally orange.
The inner surfaces of the column are covered with stinkhorn slime and spores, and which produces an especially repulsive stench. This foul odor is useful though, attracting an assortment of flies and other insects which track through it.
A small amount of the mixture of the brown slime and spores attaches to the insect’s body. It is then carried by these discerning visitors to other bug enticing spots, usually of equal or greater offensiveness to people. Spores are deposited as the slime mixture is rubbed off as the insects brush against surfaces.
Decaying woody debris is a favorable environment for the column stinkhorn to germinate. As the wood rots bacterial activity makes necessary nutrients available to this mushroom.
Other areas satisfactory for development include lawns, gardens, flower beds and disturbed soils. All contain bits and pieces of decomposing wood and bark.
Occasionally, column stinkhorns can be seen growing directly out of stumps and living trees. Presence on a living tree is a good indication the tree has serious health issues and may soon die.
This fungi starts out as a partially covered growth called a volva. The portion above and below the soils surface has the general appearance of a hen’s egg and is bright white.
The term volva is applied in the technical study of mushrooms, and used to describe a cup-like structure at the base of the fungus. It is one of the precise visible features used to identify specific species.
The cool wet weather currently in Wakulla County combined with local sandy soils and available nutrients create ideal growing conditions. While rarely notices during initial stages of growth, they are quickly spotted at or near maturity.
There are other stinkhorn mushrooms in Wakulla County, but they are not as common. In addition to North America, member of this fungi family with a fetid aroma can be found in Europe, Asia, South America and Australia.
Photo: Les Harrison
While not likely to be a Valentine’s Day gift, it still has a distinct place in the local environment. Get close and it is difficult to overlook.
To learn more about Wakulla County’s mushrooms, contact your UF/IFAS Wakulla Extension Office at 850-926-3931 or http://wakulla.ifas.ufl.edu/
by Rick O'Connor | Jun 10, 2016
I have played in the waters of the northern Gulf of Mexico all of my life… but I have never heard of this – “sea lice.” It has been in the news recently and I have had a couple inquiries concerning it so I decided to investigate.
A few weeks ago there was a report of “sea lice” in Walton County. Bathers were leaving the water with a terrible skin condition that was itchy and painful, particularly in areas beneath their bathing suits. Photos of this show a series of welts over the area – almost like a rash. What was causing it? And what can you do about it?
Illustration of the “thimble jellyfish”.
Graphic: University of Michigan
My first stop was Dr. Chris Pomory, an invertebrate zoologist at the University of West Florida. Dr. Pomory indicated that the culprit was most probably the larva of a small medusa jellyfish called the thimble jellyfish (Linuche unguiculata), though he included that it could be caused by the larva any of the smaller medusa. Dr. Maia McGuire, Florida Sea Grant, told me a colleague of hers was working on this issue when she was in grad school at the University of Miami. Published in 1994, it too pointed the finger at the larva of the thimble jellyfish. Here I found the term “Sea Bathers Eruption” (SBE) associated with occurrences of this. I also found another report of SBE from Brazil in 2012 – once again pointing the finger at the thimble jellyfish larva. So there you go… the most probable cause is the larva of the thimble jellyfish. Note here though… Dr. McGuire indicated that SBE was something that was problematic in south Florida and the Caribbean… reports from the northern Gulf are not common.
So what is this “thimble jellyfish”?
Most know what a jellyfish is but many may not know there are two body forms (polyp and medusa) and may not know about their life cycles. The classic jellyfish is what we call a medusa. These typically have a bell shaped body and, undulating this bell, swim through the water dragging their nematocyst-loaded tentacles searching for food. Nematocysts are small cells that contain an extendable dart with a drop of venom – this is what causes the sting. Nematocysts are released by a triggering mechanism which is stimulated either by pressure (touch) or particular chemicals in the water column – hence the jellyfish cannot actually fire it themselves. The thimble jellyfish are dioecious, meaning there are male and females, and the fertilized eggs of the mating pair are released into the ocean. These young develop into a larva called planula, and these seem to be the source of the problem. Drifting in the water column they become entrapped between your skin and your bathing suit where the pressure of the suit against the skin, especially after leaving the water, causes the nematocyst to fire and wham – you are stung… multiple times. The planula larva are more common near the surface so swimmers and snorkelers seem to have more problems with them.
So what can be done if you encounter them?
Well – there are two schools of thought on this. (1), go ahead and stimulate the release of all nematocysts on your body and get it over with or (2) do everything you can to keep any more nematocysts from “firing”. Some prefer #1 – they will use sand and rub over the area where the jellyfish larva are. This will trigger the release of any unfired nematocyst, you will deal with the pain, and it will be over. However, you should be aware that many humans have a strong reaction to jellyfish stings and that firing more nematocysts may not be in your best interest. Some will want to take a freshwater shower to rinse them off. This too will trigger any unfired nematocysts and you will be stung yet again. Using vinegar will have the same response as freshwater.
So what do you if you DO NOT to get stung more? Well… the correct answer is to get the bathing suit off and rinse in seawater that DOES NOT contain the larva… easier said than done – but is the best bet.
Is there any relief for the pain and itch?
Dr. McGuire provided the following:
Once sea bather’s eruption occurs (and you have taken off your swimsuit and showered), an application of diluted vinegar or rubbing alcohol may neutralize any toxin left on the skin. An ice pack may help to relieve any pain. The most useful treatment is 1% hydrocortisone lotion applied 2-3 times a day for 1-2 weeks. Topical calamine lotion with 1% menthol may also be soothing. Nonsteroidal anti-inflammatory drugs such as ibuprofen and aspirin (but not in children) may also help to reduce pain and inflammation. If the reaction is severe, the injured person may suffer from headache, fever, chills, weakness, vomiting, itchy eyes and burning on urination, and should be treated with oral prednisone (steroids). The stinging cells may remain in the bathing suit even after it dries, so once a person has developed sea bather’s eruption, the clothing should undergo machine washing or be thoroughly rinsed in alcohol or vinegar, then be washed by hand with soap and water. Antihistamines may also be of some benefit. Other treatments that have been suggested include remedies made with sodium bicarbonate, sugar, urine, olive oil, and meat tenderizer although some of these some may increase the release of toxin and aggravate the rash. Symptoms of malaise, tummy upsets and fever should be treated in the normal fashion.
This is a “new kid on the block” for those of us in the northern Gulf. It has been in south Florida and the Caribbean for a few decades. As the Gulf warms, more outbreaks may occur, there is really not much to be done about that. Hopefully most reactions will be minor, as with any other jellyfish sting.
For more information visit the Florida Department of Health.
