by Will Sheftall | Jul 22, 2016
Birds, migration, and climate change. Mix them all together and intuitively, we can imagine an ecological train wreck in the making. Many migratory bird species have seen their numbers plummet over the past half-century – due not to climate change, but to habitat loss in the places they frequent as part of their jet-setting life history.
Migrating songbirds forage for insects in coastal scrub-shrub habitat. Photo credit: Erik Lovestrand, UF IFAS Extension
Now come climate simulation models forecasting more change to come. It will impact the strands of places migrants use as critical habitat. Critical because severe alteration of even one place in a strand can doom a migratory species to failure at completing its life cycle. So what aspect of climate change is now threatening these places, on top of habitat alteration by humans?
It’s the change in weather patterns and sea level that we’re already beginning to see, as the impacts of global warming on Earth’s ocean-atmosphere linkage shift our planetary climate system into higher gear.
For migratory birds, the journey itself is the most perilous link in the life history chain. A migratory songbird is up to 15 times more likely to die in migration than on its wintering or breeding grounds. Headwinds and storms can deplete its energy reserves. Stopover sites for resting and feeding are critical. And here’s where the Big Bend region of Florida figures prominently in the life history of many migratory birds.
According to a study published in March of this year (Lester et al., 2016), field research on St. George Island documented 57 transient species foraging there as they were migrating through in the spring. That number compares favorably with the number of species known to use similar habitat at stopover sites in Mississippi (East Ship Island, Horn Island) as well as other central and western Gulf Coast sites in Alabama, Louisiana, and Texas.
We now can point to published empirical evidence that the eastern Gulf Coast migratory route is used by as many species as other Gulf routes to our west. This confirmation makes conservation of our Big Bend stopover habitat all the more relevant.
The authors of the study observed 711 birds using high-canopy forest and scrub/shrub habitat on St. George Island. Birds were seeking energy replenishment from protein-rich insects, which were reported to be more abundant in those habitats than on primary dunes, or in freshwater marshes and meadows.
So now we know that specific places on our barrier islands that still harbor forests and scrub/shrub habitat are crucial. On privately-owned island property, prime foraging habitat may have been reduced to low-elevation mixed forest that is often too low and wet to be turned into dense clusters of beach houses.
Coastal slash pine forest is vulnerable to sea level rise. Photo credit: Erik Lovestrand, UF IFAS Extension
Think tall slash pines and mid-story oaks slightly ‘upslope’ of marsh and transitional meadow, but ‘downslope’ of the dune scrub that is often cleared for development.
“OK, I get it,” you say. “It’s as if restaurant seating has been reduced and the kitchen staff laid off. Somebody’s not going to get served.” Destruction of forested habitat on our Gulf Coast islands has significantly reduced the amount of critical stopover habitat for birds weary from flying up to 620 miles across the Gulf of Mexico since their last bite to eat.
But why the concern with climate change on top of this familiar story of coastal habitat lost to development? After all, we have conservation lands with natural habitat on St. Vincent, Little St. George, the east end of St. George, and parts of Dog Island and Alligator Point. Shouldn’t these islands be able to withstand the impacts of stronger and/or more frequent coastal storms, and higher seas – and their forested habitat still serve the stopover needs of migratory birds?
Let’s revisit the “low and wet” part of the equation. Coastal forested habitat that’s low and wet – either protected by conservation or too wet to be developed – is in the bull’s eye of sea level rise (SLR), and sooner rather than later.
Using what Lester et al. chose as a reasonably probable scenario within the range of SLR projections for this century – 32 inches, these low-elevation forests and associated freshwater marshes would shrink in extent by 45% before 2100. It could be less; it could be more. Conditions projected for a future date are usually expressed as probable ranges. Experience has proven them too conservative in some cases.
The year 2100 seems far away…but that’s when our kids or grandkids can hope to be enjoying retirement at the beach house we left them. Hmm.
Scientists CAN project with certainty that by the time SLR reaches two meters (six and a half feet) – in whatever future year that occurs, 98% of “low and wet” forested habitat will have transitioned to marsh, and then eroded to tidal flat.
But before we spool out the coming years to a future reality of SLR that has radically changed the coastline we knew, let’s consider where the crucial forested habitat might remain on the barrier islands of the next generation’s retirement years:
It could remain in the higher-elevation yard of your beach house, perhaps, if you saved what remnant of native habitat you could when building it. Or if you landscaped with native trees and shrubs, to restore a patch of natural habitat in your beach house yard.
Migratory songbird stopover habitat saved during beach house construction. Photo credit: Erik Lovestrand, UF IFAS Extension
We’ve all thought that doing these things must be important, but only now is it becoming clear just how important. Who would have thought, “My beach house yard: the island’s last foraging refuge for migratory songbirds!” even in our most apocalyptic imagination?
But what about coastal mainland habitat?
The authors of the March 2016 St. George Island study conclude that, “…adjacent inland forested habitats must be protected from development to increase the probability that forested stopover habitat will be available for migrants despite SLR.” Jim Cox with Tall Timbers Research Station says that, “birds stop at the first point of land they find under unfavorable weather conditions, but also continue to migrate inland when conditions are favorable.”
Migratory birds are fortunate that the St. Marks Refuge protects inland forested habitat just beyond coastal marshland. A longer flight will take them to the leading edge of salty tidal reach. There the beautifully sinuous forest edge lies up against the marsh. This edge – this trailing edge of inland forest – will succumb to tomorrow’s rising seas, however.
Sea level rise will convert coastal slash pine forest to salt marsh. Photo credit: Erik Lovestrand, UF IFAS Extension
As the salt boundary moves relentlessly inland, it will run through the Refuge’s coastal buffer of public lands, and eventually knock on the surveyor’s boundary with private lands. All the while adding flight miles to the migration journey.
In today’s climate, migrants exhausted from bucking adverse weather conditions over the Gulf may not have enough energy to fly farther inland in search of forested foraging habitat. Will tomorrow’s climate make adverse Gulf weather more prevalent, and migration more arduous?
Spring migration weather over the Gulf can be expected to change as ocean waters warm and more water vapor is held in a warmer atmosphere. But HOW it will change is difficult to model. Any specific, predictable change to the variability of weather patterns during spring migration is therefore much less certain than SLR.
What will await exhausted and hungry migrants in future decades? Our community decisions about land use should consider this question. Likewise, our personal decisions about private land management – including beach house landscaping. And it’s not too early to begin.
Erik Lovestrand, Sea Grant Agent and County Extension Director in Franklin County, co-authored this article.
by Shep Eubanks | Jul 22, 2016
Photo 1. Large Southern Copperhead in Gadsden County – Photo by Shep Eubanks UF/IFAS
There are approximately 44 species of snakes found in Florida. The Southern Copperhead is one of the six venomous snakes that one might encounter while outdoors in the panhandle of Florida. A uniquely beautiful and secretive snake, they historically have only been found in the panhandle counties of Gadsden, Liberty, and Jackson along the Apalachicola River corridor and tributary creeks. Preferred habitat for this species is near streams and wet areas and upland hammocks adjacent to these wet areas. The copperhead is encountered so infrequently in Florida that there have been very few bites and no fatalities reported in Florida from a copperhead bite.
Photo 2. Copper head lying next to a tree in leaf litter demonstrating effective camouflage. Photo by Shep Eubanks – UF/IFAS
Copperheads are pit vipers and are recognizable by the dark brown, hourglass-shaped crossbands along the center of the back. This pattern provides the copperhead with excellent camouflage to blend in with leaves and other litter on the forest floor (see photo 2.). The same snake is pictured in photo 3, crossing a woods road before moving into the swamp edge. This snake is approximately 30 inches long which is the typical size that most adult Southern Copperheads reach.
Photo 3. Typical Southern Copperhead Crossing a Woods Road in Gadsden County. Photo by Shep Eubanks – UF/IFAS
All pit vipers in Florida have venom that is haemotoxic, that is, it destroys the red blood cells and the walls of the blood vessels of the victim. The copperhead venom is not considered to be as potent as the venom of a diamondback rattlesnake.
Copperheads bear live young, typically from 7 to as many as 20 offspring. Young copperheads have identical coloring as the adult except the young snakes have a yellow tip on the tail. The diet of copperheads is the most varied of Florida’s venomous snakes and includes many vertebrates and large insects. They are patient hunters, lying camouflaged in leaves waiting on a meal. Copperheads have been reported to climb trees when cicadas are abundant. The lifespan of a copperhead is estimated to be 20+ years in the wild.
For more information contact your local Extension office and check out these publications: Recognizing Florida’s Venomous Snakes and Florida’s Venomous Snakes.
by Sheila Dunning | Jun 3, 2016
According to the Atlas of Florida Vascular Plants, there are more than 4,200 plant species naturally occurring in the state. Nearly 3,000 are considered native. The Florida Native Plant Society (FNPS) defines native plants as “those species occurring within the state boundaries prior to European contact, according to the best available scientific and historical documentation.” In other words, the plants that grew in natural habitats that existed prior to development.
Native plants evolved in their own ecological niches. They are suited to the local climate and can survive without fertilization, irrigation or cold protection. Because a single native plant species usually does not dominate an area, there is biodiversity. Native plants and wildlife evolved together in communities, so they complement each other’s needs. Florida ranks 7th among all 50 states in biodiversity for number of species of vertebrates and plants. Deer browse on native vines like Crossvine (Bignonia capreolata), Trumpet Creeper (Campsis radicans), Yellow Jessamine (Gelsemium sempervirens) and Trumpet Honeysuckle (Lonicera sempervirens). The seeds and berries of Black-eyed Susan (Rudbeckia fulgida), Flowering Dogwood (Cornus florida) and Dahoon holly (Ilex cassine) provide vital food for songbirds, both local and migratory. Saw palmetto (Serenoa repens) provides cover for numerous birds and small mammals, as well as, reptiles.
Non-native plants become “naturalized” if they establish self-sustaining populations. Nearly one-third of the plants currently growing wild in Florida are not native. While these plant species from other parts of the world may provide some of the resources needed by native wildlife, it comes at a cost to the habitat. These exotic plants can become “invasive”, meaning they displace native plants and change the diverse population into a monoculture of one species. Chinese privet (Ligustrum sinense), Popcorn trees (Triadica sebifera) and Cogongrass (Imperata cylindrica) have changed the landscape of Florida over the past decade. While Water hyacinth (Eichhornia crassipes) and Hydrilla (Hydrilla verticillata) have changed water flow in many rivers and lakes. These invasive species cost millions of taxpayer dollars to control.
By choosing to use native plants and removing non-native invasive plants, individuals can reduce the disruptions to natural areas. For more information one specific native plants that benefit wildlife go to: http://edis.ifas.ufl.edu/uw384
It learn which plants are invasive go to: http://www.fleppc.org/list/2015FLEPPCLIST-LARGEFORMAT-FINAL.pdf
by Rick O'Connor | May 8, 2016
When doing programs about snakes I find plenty of people who hate them… but I have never found anyone who hated turtles. I mean what is there to hate? They are slower, none of them are venomous, they have shoulders… people just like them. And to that point, when people see them crossing the road almost everyone wants to help. But that can be dangerous – for you and for the turtle. Here are couple of safety tips you should know before helping a turtle cross the road.
This small turtle can be held safely by grabbing it near the bridge area on each side.
Photo: Molly O’Connor
Your Safety
You would be surprised by the number of people, particularly children, that are hit by cars while trying to help turtles cross the road. One story I heard involved nine-year-old girl who was riding in the backseat with her grandmother. They both saw the turtle trying to cross a busy highway and wanted to help. The grandmother pulled over to the side but before she could even get the car in park the little girl opened the door and ran into the highway only to be struck by an oncoming car. We all like turtles, and do not want to see them hit by cars, but as sad as it is to see a turtle hit – it is horrific to see the same happen to a child. No matter what your age – please watch for traffic before attempting to help a turtle.
Turtles Bite
Yep… unlike their reptilian cousins the snakes, lizards, and alligator, turtles do not have teeth… but they do have a beak. The beak is made of a hard bony like material that is blade sharp in carnivorous turtles, and serrated like a saw in herbivorous ones – both can do serious damage. Some species of turtles feed on a variety of shellfish, and if they can crush shell they can certainly do a number on your hand – so you have to be careful. First thing you should do is determine whether the turtle needs to be handled. If traffic is not too bad, or the road not too wide, you may be able to just manage traffic so the turtle can cross on its own. If you feel that you must handle the turtle, there are safe ways to hold them. Smaller turtles can be held safely from the sides by grabbing the bridge area – the portion of the shell connecting the top (carapace) to the bottom (plastron). Many turtles will begin to kick their feet when you do this and their claws may scratch – be prepared for this. There are two groups of turtles that have extended necks and your hands, grasped near the bridge of their shell, are still within range of their mouths – these are the snapping and softshell turtles. Both are notorious for their bites. So how do you handle those? Below is a short video put together by the Toronto Zoo that gives you some ideas on how to handle those situations.
https://m.youtube.com/watch?v=Lgd_B6iKPxU
Turtle Direction
Turtles cross highways for a variety of reasons – females looking for high dry ground to nest, individuals looking for more productive ponds, males looking for females – whatever the reason they are heading that way and will continue to do so. Placing them on the side of the highway where they came from will only initiate another attempt to cross. Move them to the side of the road they were heading.
The majority of turtle crossings occur during spring and summer. Untold numbers are killed each year on our highways – many gravid females carrying the next generation of the species. Though we encourage turtle conservation in Florida you do have to be smart about it. If you have any questions about Panhandle turtles in Florida contact your local extension office.
by Rick O'Connor | Apr 22, 2016
Many folks are putting together a “bucket list” of things they would like to do or see before they can no longer do them. For many interested in natural resources there are certain national parks and scenic places they would like to visit. Other natural resource fans have a list of wildlife species they would like to see.
Terrapins inhabit creeks, such as this one, within the expanse of the salt marsh. Here you can see their heads pop up above the water and you may get lucky enough to find one basking.
Photo: Rick O’Connor
Recently I hooked with famed Alabama outdoorsman Jimbo Meador to search for locations to find Alabama turtles. Jimbo has been fishing, hunting, and enjoying the Mobile Bay area all of his life and he now using that knowledge as a guide in a nature-based tourism project. He recently received a call from a group of gentleman from another part of the country who had on their bucket list viewing 1000 reptilian species in their native habitat. In Alabama they were interested in the Black-knobbed Map Turtle, the Alabama Red Belly, and the Diamondback Terrapin. Jimbo has just begun the first module of the Florida Master Naturalist Program and reached out to us for advice on where to find these guys. Luckily, after working with scientists from the University of Alabama at Birmingham, I knew where to find diamondback terrapins – and have a pretty good idea on the others.
These “diamonds of the marsh” – as they are sometimes called – are very elusive creatures. They inhabit muddy bottom creeks within extensive salt marsh habitat all along the Gulf and East coast of the United States. I spent two years searching the Florida panhandle before I found my first live animal. It was one of the odd things though – once you have seen one, you now know what you are looking for and begin to find more.
I took Jimbo to a location near Dauphin Island where about 150 terrapins are believed to exist. Terrapins spend most of their day within creeks that meander through acres of salt marsh. The odd thing is there may be hundreds of creeks within these marshes and the terrapins – for some reason – will select their favorites and hang there. You can spend all day paddling through perfect looking creeks not seeing a head at all… then all of sudden… you enter one creek… not really any different than the others… and there they are.
Veteran waterman and outdoor guide, Jimbo Meador, explores the marshes near Dauphin Island for the elusive diamondback terrapin.
Photo: Rick O’Connor
Within these creeks they feed on a variety of shellfish but particularly like the marsh periwinkles. These small snails are the ones that climb the cordgrass and needlerush plants during high tide to avoid their nemesis the blue crab and the diamondback terrapin. Terrapins do crawl out of the water to bask in the sun and have been known to bury in the loose fine mud. Females must find high dry ground to lay her eggs. She may swim as far as 5 miles from her home creek to find a suitable beach. They do like sandy beaches that are open and free of most plants. They emerge onto these beaches during May and June to lay about 7-10 eggs. Most females will lay more than one clutch each season emerging once every 16 days or so. Different from sea turtles – terrapins nest during the daylight hours. Actually the sunnier – the better. Raccoons are a big problem… find and consuming the eggs; on some beaches researchers have reported 90% or more of the nest have been raided by the furry guys. Crows, snakes, and possibly armadillos will take nests as well. If the developing young survive the 60+ days of incubation, they will emerge and head for the grass areas of the marsh… not the water. Here they will spend the first year of their life living more like a land turtle before they make their way to the brackish waters of the salt marsh.
Open sandy beaches, such as the one in this photograph, are the spots females terrapins seek when they are ready to dig a nest.
Photo: Rick O’Connor
These are fascinating creatures and should be on everyone’s natural resource bucket list. The hard effort of finding them really makes doing so very rewarding. On this day Jimbo saw only one head – I did not see any. I have found in my study site that I see more heads in the afternoon (we were out in the morning). I do not know if this is the case at all terrapin nesting sites, but something to consider when looking. Though we did not find many that day he now knows what to look for when searching for them. Next we will have to hunt the Alabama Red Belly Turtle. That is another story for another day.
We will continue this series with other interesting wildlife creatures to “hunt” in the Florida panhandle.
by Rick O'Connor | Apr 8, 2016
This gopher tortoise was found in the dune fields on a barrier island – an area where they were once found.
Photo: DJ Zemenick
The state of Florida has designated Sunday April 10 as “Gopher Tortoise Day”. The objective is to bring awareness to this declining species and, hopefully, an interest in protecting it.
During his travels across the southeast in the late 18th century, William Bartram mentioned this creature several times. As he walked through miles of open longleaf pine he would climb sand hills where he often encountered the tortoise. These turtles do like high dry sandy habitats. Here they dig their famous burrows into the earth.
These burrows can extend almost 10 feet vertically below the surface but, being excavated at an angle, can extend 20 feet in length. There is only one entrance and the tortoise works hard to maintain it. Field biologists have been able to identify over 370 species of upland creatures that utilize these burrows as refuge either for short or long periods of time. These include the declining diamondback rattlesnakes, gopher frogs, and the endangered indigo snakes, but most are insects and small mammals. Because of the importance of the burrows to these species, gopher tortoises are listed as keystone species – meaning their decline will trigger the decline of the others and can upset the balance of the ecosystem. Gopher burrows can be distinguished from mammal burrows in that they are domed across the top but flat along the bottom, as opposed to being oval. The width of the burrow is close to the length of the tortoise. When danger is encountered the tortoise will turn sideways – effectively blocking the entire entrance. Though there are cases of multiple tortoises in one, the general rule is one tortoise per burrow.
Tortoises are herbivores, feeding on a variety of young herbaceous shoots, and fruit when they can get find them. Fire is important to the longleaf system and it is important to the gophers as well. Fires encourage new young shoots to sprout. If an area does not receive sufficient fire, and the ground vegetation allowed grow larger with tougher leaves, the tortoise will abandon their burrow and seek more suitable habitat – which, especially in Florida – is becoming harder and harder to find. They typically breed in the fall and will lay their 5-10 eggs in the loose sand near the entrance of the burrow in spring. In August the hatchlings emerge and may hide beneath leaf litter, but will quickly begin their own burrows.
This tortoise is only found in the southeast of the United States and it is in decline across the region. They are currently listed as threatened in Florida but are federally protected in Louisiana, Mississippi, and western Alabama. They are found across our state as far south as the Everglades. There are several reasons why their numbers have declined. Human consumption was common in the early parts of the 20th century, and still is in some locations – though illegal. Some would, at times, pour gasoline down the burrow to capture rattlesnakes – this of course did not fare well for the tortoise. A big problem is the loss of suitable habitat. Much of upland systems require periodic fires to maintain the reproductive cycle of community members. The suppression of fire has caused the decline of many species in our state including gopher tortoises. These under maintained forest have forced tortoises to roadsides, power line fields, airports, and pastures. In each case they have encountered humans with cars, lawn mowers, and heavy equipment. Keep in mind also that our growing population is forcing us to clear much of these upland habitats for developments where clearing has caused the burial (entombment) of many burrows.
This is a unique turtle to our region and honestly, is a pleasure to see. We hope you will take the time to learn more about them by visiting FWC’s Gopher Tortoise Day website, enjoy watching them if they live near you, and help us conserve this species for future generations.
