When snorkeling the grassbeds of the Florida panhandle encountering a reptile has a low probability, but it is not zero. Of all the reptiles that call this part of the state home, few enter marine waters and most of those are very mobile, moving up and down the coast heading from one habitat to another. In fact, there are no marine reptiles that would be considered residents of our seagrasses, only transients.
The one species that you might encounter is the green sea turtle (Chelonia mydas). This is the largest of the “shelled” sea turtles and has a vegetarian diet. With a serrated lower jaw, they can be found grazing in the seagrass beds feeding on both the grasses and the species of algae found there. The carapace length of these large reptiles can reach four feet and they can weigh up to 400 pounds. Their coloration is similar to that of the loggerhead sea turtle (Caretta caretta) but their heads are smaller and there are only two large scutes between the eyes rather than the four found in the loggerheads. The colors of the skin and shell have shades of brown, yellow, orange, and some black and can be quite beautiful. The name “green” sea turtle comes from the color of their internal fatty tissue. Feeding on a diet of seagrasses, it becomes green in color, and this was discovered by early fishermen who hunted and consumed this species. It is the one used most often in what is called turtle soup and is actually farmed for this dish in other countries.
The green sea turtle.
Photo: Mile Sandler
Like all sea turtle species, they are born on the Gulf side of our barrier islands. If they successfully hatch, they work their way to the open water and spend their early years in the open sea. Some have been associated with the mats of Sargassum weed floating offshore, feeding on the variety of small invertebrates that live out there. They will also nip at the Sargassum itself. As juveniles they will move back into the coastal estuaries where they begin their vegetarian lifestyle. As adults they will switch time between the open sea and the grass filled bays. Once unfortunate side effect of feeding in our grassbeds is the frequency of boat strikes. There are tens of thousands of motored vessels speeding through our grassbeds and the turtles surfacing for air can be targets for them. Our hope is that more mariners are aware of this problem and will be more vigilant when recreating there.
Another turtle who IS a resident of the estuary is the much smaller diamondback terrapin. Though terrapins much prefer salt marshes they will enter seagrass beds, and some spend quite a bit of time there. Terrapins prefer to feed on shellfish so, moving through the grassbeds it is the snails and bivalves they seek. Because of their size they feed on the smaller mollusk. A typical terrapin will have a carapace length of about 10 inches and may weigh two pounds. They will take small crabs and shrimps when the opportunity is there, and they are known to swim into submerged crab traps seeking the bait. Unfortunately, being air breathing reptiles, they will drown after becoming entrapped. It is now required that all recreational crab traps in Florida have bycatch reduction devices (BRDs) on each of the funnel openings to reduce this problem. Many studies, both here in Florida and elsewhere, have shown these BRDs do not significantly reduce crab catch and so you can still enjoy crabbing – just not while catching terrapins. Encountering one snorkeling would be a very rare event, but – particularly in the eastern panhandle – has happened.
Diamondback terrapin.
Photo: Rick O’Connor
A third reptile that has been seen in our grassbeds is the American alligator (Alligator mississippiensis). Preferring freshwater systems, encounters with alligators in an open seagrass bed are rare, but do happen. There are plenty of freshwater ponds on some of our barrier islands that the alligators will use. They have been seen swimming out into the seagrass beds and often will cross the bay, or Intracoastal Waterway, to mainland side. They have also been seen swimming near shore in the Gulf of Mexico. Though they can tolerate saltwater, they have a low tolerance for it and do not spend much time there.
Alligators are top level carnivores feeding on a variety of wildlife. Like most predators, they tend to seek and capture the easiest prey. Most often these are fish, reptiles, or small mammals. But they will take on large birds or deer if the opportunity presents itself. Despite their natural fear of humans, they have taken pets and also have attacked humans.
Having only canines in their mouths, they must grab the prey and swallow it. Lacking molars, they cannot chew. So, more often than not, they select prey they can swallow whole. If they do grab a larger animal, they are known to drown the creature in what has been termed the “death role” and cache it beneath the water under a log (or some structure) where it will soften to a point where they can cut small pieces and swallow it. All of the alligators I have seen in our grassbeds were definitely heading somewhere. They were not spending time there. After heavy rains the salinity may drop enough to where they can tolerate being out there longer and encounters could increase. But they are still rare.
Alligator
Photo: Molly O’Connor
I will mention here that there are several species of snakes that, like the alligator, are swimming from one suitable habitat to another – crossing the seagrass in route. All snakes can swim and encounters in brackish water are not unheard of. I have several photos of diamondback rattlesnakes (Crotalus adamanteus) swimming across the Intracoastal Waterway between the mainland and the islands.
Eastern diamondback rattlesnake swimming in intracoastal waterway near Ft. McRee in Pensacola.
Photo: Sue Saffron
Encounters with reptiles are rare in our seagrass beds but pretty exciting when they do occur. There is certainly no need to fear swimming or snorkeling in our bay because they are so rare. But maybe one day you will be one of the lucky ones who does see one.
“I can’t do what? – because of a mouse? – it’s only a mouse.”
This was a comment made by many who lived on Perdido Key when a small beach mouse found only there was added to the endangered species list. It is a comment heard often when many species are listed. A major reason most species begin to decline and become endangered is loss of habitat. We enter and change the habitat to suit our needs. Much of this includes construction of buildings and altering landscapes to a more artificial setting and much of the local wildlife is lost. So is the case with this little mouse.
The Choctawhatchee Beach Mouse is one of four Florida Panhandle Species classified as endangered or threatened. Beach mice provide important ecological roles promoting the health of our coastal dunes and beaches. Photo provided by Jeff Tabbert
The Perdido Key beach mouse (Peromyscus polionotus trissyllepsis) is one of seven subspecies of beach mice found in Florida, five of those found in the Florida panhandle. Beach mice are a subspecies of the Old-Field mouse (Peromyscus polionotus). They are small, about 5 inches long, with tails that have hair (which are an additional 2 inches). Beach mice typically have a brown/gray color on top and a lighter white underbelly allowing them to blend into their environment very well. The difference between the subspecies is the extent of the coloration.
The subspecies status, and genetic isolation, is part of the reason these mice are listed. Members of a population who are genetically isolated from others can undergo a process called speciation where the genetic changes that occur in one isolated group cannot/do not flow through the gene pool of the other isolated group. Over time, the genetics, and morphology, of one isolated group becomes different enough that a new subspecies, or even species, develops. This is the case with the Perdido Key beach mouse. It is isolated on Perdido Key, a barrier island, and does not interbreed with their closest neighbors – the Alabama beach mouse (P.p. ammobates) and the Santa Rosa beach mouse (P.p. leucocephalus). Because of this, ALL of the Perdido Key beach mice in the world live on Perdido Key. Their population is small and vulnerable.
These mice are dune dwellers living in small burrows. They prefer the primary dunes (closest to the Gulf) which are dominated by the grasses whose seeds they like to feed on. They forage at night (nocturnal) feeding on the seeds of the sea oat (Uniola paniculate), panic grass (Panicum amarum), and blue stem (Schizachrium maritimum) usually in the secondary dunes. Highly vegetated swales (low wet areas between the primary and secondary dunes) are used to move between these habitats, and they are also found in the tertiary dunes (on the backside of the island where trees can be found) where their burrows are more protected from storm surge during hurricanes. During periods when seeds are not available, beach mice will turn to small invertebrates to support their diet. Their foraging range averages around 50,000 ft2.
Breeding takes place in the winter, though can occur anytime of year if enough food is available. They are monogamous (males pairing with only one female for life) with the females giving birth after 23 days to four pups. New members of the family can move up to half a mile in search of a foraging range for themselves. It is understood that with limited available habitat on an isolated island, the carry capacity of the beach mouse would be low. Owls and snakes are some of the predators they face, but the beach mice have evolved to deal with few predator issues.
The increase of humans onto the barrier islands has negatively impacted them. The leveling of dunes for houses, condos, swimming pools, and shopping centers has significantly reduced suitable habitat for them as well as reduced the seed food source. Introduced feral and free roaming domestic cats have also been a large problem. Bridges connecting these islands to the mainland have allowed foxes and coyotes to reach, and increase pressure on, them. With these increased pressures, and small populations, these mice are now listed under the Endangered Species Act.
Conservation measures have included, predator control, building and landscaping restrictions, translocation (moving mice from large populations to those that are smaller), and reintroduction (releasing mice into areas where they once existed but no longer do). There has been success with the Choctawhatchee beach mouse in the Grayton Beach area, as well as the Perdido Key beach mouse in Gulf Islands National Seashore. Things that beach residents can do to help beach mice populations include keeping your pets inside at night, plant native grasses in your landscape, reduce night lighting, do not walk over dunes – use the cross walks.
Things seem to be improving for beach mice, but the development pressure is still there. Hopefully we will have these creatures as part of our panhandle barrier island communities for many years to come.
References
Beach Mouse Fun Facts. Gulf Islands National Seashore. U.S. Department of Interior.
In 1973 the United States Congress passed the Endangered Species Act. Controversial at the time, and still is today, the law was designed to help protect, and possibly restore, species that were near extinction within the boundaries of the United States. At the time there was a lot of concern about what was happening to whale populations across the world. These majestic creatures were being hunted by humans for food and other products. The hunt had been going on for centuries but in the mid-20th century it moved to an industrial scale and many populations were on the verge of extinction. The backlash from many around the world was enough for regulators in the United States to take notice.
In the 1970s there was an estimated 1000 manatees in Florida. These animals suffered from the increase of humans in their environment altering the habitat and literally running over them with an increase in boating traffic. Many growing up in Pensacola at the time had never seen a brown pelican and had never heard of an osprey. And then there was the decline of our national symbol – the bald eagle, and other national icons like the bison, bears, alligators, and moose. The loss of wildlife was noticeable.
At the time, if you looked at what was happening from the “30,000 foot” level, you could see the impact. Our barriers islands, which supported dunes that reached 40-50 feet tall, were being cleared at an alarming rate. Being replaced by large concrete structures, parking lots, and amusement parks. This loss of habitat forced the decline of the diversity and abundance of wildlife and the carrying capacity of supported populations declined.
If you looked seaward into the Gulf of Mexico, you saw a change from smaller boats with 75-100 horsepower motors to large vessels with up to four 350 horsepower motors on each boat. The number of these vessels seeking fish increased from hundreds to thousands, to even tens of thousands in some locations. Just visit one of the passes into the Gulf one weekend and you will witness the number of fishing vessels heading out. These boats were heading to fishing sites that at one time supported a species’ carrying capacity that was high and could certainly sustain the human need for food. Today these systems are stressed due to overharvesting.
If you looked towards the estuary, you saw the increase growth on the island produce runoff that made the waters more turbid, creating conditions that stressed many species of fish, invertebrates, and plants. Most notably was the loss of seagrass, which supports at least 80% of the economically important finfish and shellfish we seek. We removed coastal salt marshes, which also support fisheries, and replaced them with piers, docks, seawalls, and manicured lawns. These alterations again supported the decline of needed habitat and the diversity and abundance of coastal species. Creatures that were once common in many locations like horseshoe crabs, blue crabs, and echninoderms were now hard to find in some bays. The prized bay scallop is all but gone in many locations along with the recreational fishery that loved them.
On the mainland side of the estuary, you find the large cities. These are the locations that both the early European colonists and the Native Americans sought. They were at the connection between the freshwater rivers and estuarine habitats that supported their way of life. In the mid-20th century, these communities witnessed massive growth of humans. These humans cleared land, built concrete buildings and roads, decreased suitable habitat for much of the life that existed there, and increased pollution in both the ground and surface waters. Oyster beds began to decline, seagrasses that had reached the upper portions of the bay declined, and salt marshes were removed for a different sort of waterfront.
Much of this had been noticed even in the 1960s. The species that spawned the Endangered Species Act were mostly the large vertebrates that people felt close to, or the need for. Species such as whales, dolphins, manatees, and sea turtles. People were concerned about species like bison, moose, and pelicans. But, as the draft of the law was formed, it included others that were not on their radars like alligators, frogs, and sturgeon. The focus of the effort was the large vertebrates we were concerned about. However, there were numerous small creatures that were being lost that became part of the movement such as river mussels, snails, even beach mice. Then there were the numerous small creatures that will still do not know about.
For decades scientists have written about the world of the tiny creatures that live within the sand grains, and on the surface of seagrass that play crucial roles in the over health of the ecosystem and support, directly or indirectly, the larger creatures we care about. Even with the decision as to which species would be listed as “endangered” we saw favoritism for the large vertebrates that we appreciate. When placed up for listing consideration species like spiders, sharks, and snakes were met with resistance. Though their populations may have needed this protection, we did not want to protect those.
Despite some opposition from the beginning, the Endangered Species Act has had many success stories. Several species of whales are now stable or increasing, manatee populations have more than doubled, pelicans are common, everyone knows what an osprey is now, and viewing a bald eagle in Pensacola – though still exciting – is becoming more common place. Another sign of success are species that have been de-listed from endangered to threatened or removed completely. Alligators, bison, manatees, several species of sea turtles, and even the bald eagle have had this honor.
Over the next few months, we will post articles about species that benefitted from the Endangered Species Act, and species who are still struggling and should benefit from it now. There is no doubt that some humans suffered economically with the passing of this law, but its intent of preserving, and increasing the fish, wildlife, and even plants – that we love and need, as worked.
About now a doe is searching among the shrubs and grasses. She is looking for a site to have her fawns.
White-tailed deer fawn season will peak in the summer across the Florida Panhandle. In the first weeks of life, fawns are not able to follow their mother and spend most of their time bedding. Although vulnerable, fawns can still rely on remarkable adaptations to survive. Their spotted coat provides excellent camouflage amidst the dappled sunlight filtering through the vegetation. To avoid being detected by predators, newborn fawns also have minimal scent and the ability to suppress their respiratory and cardiac systems when predators are nearby.
In addition to these critical adaptations, vegetation cover is essential to provide fawns the protection they need from predators. A lack of ground cover makes fawns very easy for predators to see, spots or not. This cover is also critical to protect fawns from heat, especially during Florida hot summers. Ideal fawning sites have thick and abundant vegetation. In particular, early successional sites where forbs (i.e., broad-leaved herbs) and native grasses are abundant are the perfect hiding cover for fawns. While forbs and grasses are important components of fawn cover, forbs can also help improve mother’s and fawns’ nutrition. In fact, forbs can be rich in crude protein and nutrient content, with some forbs reaching more than 30 percent crude protein content. The summer is a period of exceptionally high nutritional stress for mothers and fawns, and access to high-quality forage promotes fawn nutrition and growth. Because the mothers do not usually move far from their fawns, fawning sites rich in forbs can keep mothers healthy, and provide good forage for fawns.
Knowing the challenges fawns face, here are three things you can do to help:
First, if you find fawns, do not approach them – they are most likely not abandoned! Mothers leave fawns alone to avoid attracting predators close to the fawn bedding area, but they visit them throughout the day to nurse. Interacting with the fawn may cause them stress and, if fawns are relocated by humans, they may be permanently separated from their mothers.
Second, do not mow or pay close attention when mowing. Mowing can remove good fawn cover or, worse yet, endangering fawns.
Third, it is essential to promote good fawn cover. Landowners and managers can promote fawn cover by establishing or maintaining existing early successional sites such as forest openings. Thinning and prescribed fire can go a long way to promote this vegetation structure. However, remember that it takes time for the vegetation to respond and regrow after management practices have been applied. For example, mothers with fawns will likely avoid freshly burned areas unless they are close to other areas with better cover.
My wife and I like to sit on our back porch and watch the sunset each day. We do not make all of them, but we try to make as many as we can. We often see small bats darting in all directions feeding on bugs. Recently we were enjoying a particularly great sunset. The sky was a light blue with streaking clouds of dark gray, purple, orange, and white. It was amazing. As the streetlight came on, we could see a swarm of termites gathering around it. There were a lot of them, but we also noticed the increase in bats. There was a dozen at least, probably more, zipping in and out, darting in all directions. We enjoyed watching them and wondered where all of them were roosting.
Bats sometimes move into buildings when they can’t find the natural structures they prefer (caves and large trees with cavities).
Many people are afraid of these creatures. They have been associated with Halloween, horror, vampires, and rabies. They are creatures of the night, and that is unsettling in itself for many. But, as biologists say with most creatures, these stories and legends are just that… stories and legends. Some members of their population do carry rabies, but most do not and the transmission of the disease to humans is rare. The animals are small furry mammals that eat an enormous number of insects each evening, including flying termites and mosquitoes. Many help pollinate plants and help disperse seeds. They are really pretty cool.
There are around 1400 species of bats worldwide1, 13 of these are from Florida2. Though some species feed on fruit and nectar, most feed on insects and consume about half their body weight each evening doing so. The Bat Conservation International states that insect consuming bats may save U.S. farmers $23 billion dollars a year in pesticide use due to their insectivorous diet1. The agave plant, the one used to produce tequila, is primarily pollinated by bats. The 13 species found in Florida are all insectivores feeding on beetles, mosquitos, moths, and other agriculture and garden pests. They are truly beneficial.
Bats are mammals, having fur covered bodies, live birth with young nursing on milk, and being endothermic (warm blooded). Most connect bats with the mammalian order Rodentia (rodents) – often calling them “flying rats”, but – due to the type of teeth – they are actually in their own order Chiroptera. They are the only true flying mammals in the world, the flying squirrel is actually a glider, not a true flyer. They live in a variety of habitats in Florida including pine forests, hardwood forests, riverine systems, lakes, and in urban areas. They most often roost in the crevices of dead trees, beneath the dead fronds of palms, and in Spanish moss. But when available, they will use caves and are notorious for using buildings, culverts, and the underside of bridges.
They fly using wings that are actually thin skin between their extremely elongated fingers. They breed in the fall and give birth to a single pup in the spring. One of the legends is that they are blind. As mentioned above, this is a legend. Bats can see well and see better than we do in dim light. They do have the ability to use high frequency sounds to “echo” off objects in the dark (echolocation) which helps them find, and follow, their insect prey at night. You can notice this hunting tactic as the sun sets and view the bats darting in all sorts of directions chasing their prey.
Most of the 13 species of Florida bats can be found in the Florida panhandle, with the gray bat only found in Calhoun and Jackson counties and nowhere else in the state. Rabies is a concern with bats, and it is true that an infected bat with the disease can transmit it to humans, but this is very rare. That said, anyone who is bitten by a bat should seek medical attention. The animal was also connected with the transmission of COVID during the early period of the pandemic3. Bats, like many other mammals, can pass infectious diseases and there is also a fungal growth associated with their droppings that has caused medical problems with some humans. If working in an area where bat guano is abundant, a mask is recommended. If an injured animal is found in your yard, wear a pair of gloves and take it to your local wildlife rehabber.
Florida bats do face problems in our state with the loss of habitat. We often remove dead trees and cut dead fronds from palms. The benefit we receive from them (consuming thousands of pest insects each night) leads to a need for their conservation. To date, the white-nose syndrome, which has infected many bats north of us, has not reached Florida but is of concern. Despite the fear many have of this animal, they are quite beneficial and should be allowed to exist in our panhandle habitats.
Species found in Florida:
Mexican Free-tailed bat
Southeastern myotis
Evening bat
Eastern red bat
Seminole bat
Northern yellow bat
Tricolored bat
Gray bat – endangered; only found in Calhoun and Jackson counties.
This sounds similar to the idea that has been discussed about protecting some species of sharks. Do we really want to do this?
It reminds me of an interesting situation that was created when they passed the Marine Mammal Act in 1972. The law seemed simple enough. Citizens wanted to protect our marine mammals – such as whales, dolphins, and manatees. But it also included the polar bear, a dangerous animal. If you lived in a community where polar bears existed, and had one enter town that could possibly be a threat to the citizens, could you shoot it? A colleague of mine had a brother who worked with Alaska Fish and Game. We asked this question. He told us that – yes, if you were threatened by one you would shoot it. But you would have to defend yourself in court that it was defense and that you were not actively hunting the bear.
It seems odd to some that we would even consider protecting a creature that is potentially lethal to humans. But, as has been said so many times before, though they are potentially lethal, they rarely are. Rattlesnakes are different from polar bears in they do not seek us out when they are near us. They actually try to avoid us. In the United States only 5-6 people die each year from venomous snakes bites1. Comparing this to the number who die in car accidents, gun violence, or opioid overdose, there is no comparison. So, though the potential is there it is a very low risk. We can also note that many who bitten by snakes were trying to catch or kill the animal.
On the other side of the coin, these animals do us a service by controlling disease caring rodents. When predators select and kill prey, they tend to select one that is easy to catch and kill. Most predators not only have teeth, but hands and claws to grab the prey. The only thing a snake can do when it sees a rodent is grab it with its mouth and hold on. Many snakes do this, almost 90% of those in Florida do. But a few have venom. This can be injected into the prey so that the snake does not have to hold on, making the process much easier. It makes sense for snakes to have venom and is surprising that more do not. However, this venom was meant for killing prey, not for defending against predators. And rattlesnakes, like other venomous snakes, do not want to use it on humans if they can avoid it. As my professor told us in college venom is “expensive”. It is a complex cocktail of proteins they must produce, and they do not want to waste it.
So, though it seems strange that a state or federal agency would even consider protecting dangerous animals, they do. These creatures play a vital role in the ecology of local systems and if their numbers decline that role is not filled and the spin-off results could have larger negative impacts on us.
The U.S. Fish Wildlife Service has been petitioned to list the eastern diamondback rattlesnake (Crotalus adamanteus). This animal inhabits several habitats within the coastal southeastern United States. The National Council of Air & Stream Improvement, Inc. – a scientific research organization that provides technical information on environmental issues concerning forestry and forestry products – is conducting a survey to better understand its distribution and habitat preferences. They are asking people to report sightings of this snake. You can do so by visiting the following link. Please take photos.
The eastern diamondback rattlesnake is a classic serpent found in xeric habitats like barrier islands and deserts. They can be found in all habitats on barrier islands.
Photo: Bob Pitts
