Category Archives: Gallery

A return to Palo Verde: Mentoring an OTS student project

This week, I’ve been acting as a Visiting Faculty member for a course in tropical biology run by the Organization for Tropical Studies after an invitation from my friend, Darko Cortoras. It’s been six years since I’ve last been in Palo Verde—the last time, again, was as an invited faculty member for a course coordinated by the then-REU coordinator, Scott Walter. And, it’s been three years since I’ve been to Costa Rica; by far the longest period since I was first able to go in 2007 with a tropical ecology course at Kent State.

The primary responsibility I have has been to mentor a brief project with a group of undergraduate students enrolled in the course, but I also delivered a lecture on decomposition in the tropicals and a seminar covering some of the research I’ve done in the wetlands at Palo Verde and beyond.

A view of the wetland from the top of a viewing tower within.

My students have been fantastic; I think this has been the first time some of them have ever been in a wetland before, and we spend a good 10 hours trudging through the waist-deep water to collect some data on macrophyte community composition. It is encouraging to jump into the much with a group of euthusiastic students who suffer through the uncomfortable heat, bugs, skink, and work with smiles and excitement.

In any case, their project concerns the abrupt change in macrophyte communuity composition across habitat types created by management of the wetland. That is, the wetland is managed to reduce cattail (Typha domingensis) domination of the landscape, and it has been successful in increasing diversity and wetland use by many metrics, including birds and macrophyte species.

We ran transects at the edge of large patches of T. domingensis, sampling 10 m within the T. domingensis, at the edge of the patch, and 10 m outside. At each sampling point along the transect, students identifed all of the macrophytes within a 50×50 cm quadrant, ranking the top three species, to esimate community composition.

View from Guayacan Overlook of the wetland at Palo Verde. Dark-green patches are dominated by Typha domingensis.

The students were able to demonstrate that macrophyte communities differed within the T. domingensis patches, and the edge of the patches represented an abrupt change in community composition, but communities were similar at the edge and beyond.

Mean Shannon-Weiner diversity at the three transect locations. Core differed from edge and matrix, but diversity was similar between edge and matrix samples. Error bars represent standard deviation.
An RDA showing differences in macrophyte community composition in T. domengensis “core” (left most polygon and centroid), “edge” (top-right), and “matrix” (bottom-right).

These student projects are developed and completed in about two days—an awesomely fast turn around. I think differences between edge and “matrix” or outside habitat could be demonstrated if they had time to measure percent cover of the quandrants using top-down images, which they took but didn’t have time to quantify.

The drive and excitment in developing, collecting data, and presenting their work was excellent; I think they came away from the experience having learned a good amount about the scientific process, wetland macrophyte communities, and teamwork. I’m happy I was able to guide them and a bit sad that I’m now headed back to the desert in Grand Junction… although I think Amos will appreciate my return.

Rocky’s back!

Welp, it looks like Rocky had escaped after all. Amos recently discovered Rocky climbing around an upside-down garbage can lid in the yard as he chased after a squirrel. I’ve modified the enclosure to include some hanging lips to reduce the chance that he can climb out again, but the yard itself is well sealed too… I think.

In any case, Rocky was ravenous; he immediately chowed down on some dog food when I presented it to him.

And another piece of news: I’ve inherited another box turtle from a neighbor who’s moving. It’s another male, and, after a brief attempt at mounting him, Rocky and Humphrey immediately began a bout of aggressive bobbing and biting. They do not get along and are now separated.

Rocky’s gone

I wrote about some happy pet news last week—a tribute to Amos’ eighth year with me. Now, I have some sad pet news to report.

Rocky, my Eastern Box Turtle for the past 15 years or so, has disappeared.

Origins

I adopted Rocky from some Kent State faculty, whose son seem to become bored with him, circa 2007. At the time, I had three other turtles, two Red-eared Sliders and an Eastern Painted Turtle, so Rocky was a treat—a terrestrial turtle who didn’t require a massive water change regularly. I was told that Rocky was wild-caught by a child in school, who brought him into school to hand him over to another graduate student, who was working there at the time, enrolled at Kent State with me. She, Tracy, may have kept Rocky for a few years, then donated him to the other faculty… who had him for a few years. Suffice it to say: it’s hard to know how old he was, but 15 was the bare minimum.

[Edit: According to Tracy: “when I started teaching middle school (97-98) in Columbus, a student had Rocky at home and brought him in as a class pet. Around 2002, Rocky went to live with the Leffs.”

Rocky as a pet

Rocky was a peculiar pet. He slept in weird positions, looking dead, using “pillows”, stretching in odd angles. He would mount anything that vaguely resembled another turtle—from rocks to other species, like a Diamond-backed Terrapin or any one of my other aquatic turtles during a tank cleaning.

Rocky travelled from Ohio to Atlanta and Savannah with me. He first lived in a ~55 gallon terrarium with a water partition, but I moved him to another, smaller tank after I inherited two corn snakes (1 and 2).

In my apartment in Southside in Savannah, Rocky lived on my covered porch for about three years. He over wintered under some potting soil and was greeted each morning by Amos and Eva—when I asked “where’s Rocky?,” Amos would sniff around the porch until he found Rocky and received a treat (I wish to generalize the behavior to use Amos to find turtles in the field… never happed through).

After moving out of Southside, Rocky lived in a closet for a few months (within a terrarium), then, mostly, in my office on campus. I would bring him into some classes when I thought I could relate course content to him (mostly just taxonomy). Rocky would eat tomatoes, poop out the seeds in his water dish, and I would use the turtle water to fertilize some potted plants. The tomato seedlings are still thriving.

During the summers, my friend and colleague, Michele, cared for Rocky while I was in Costa Rica. She treated him well—regular fresh foods and an offer to grind his beak down. Michele had done some freeze-tolerance research on box turtles in undergrad at our alma mater, Nazareth College.

Most recently, during the beginning of the COVID-19 stay-at-home orders, I brought him home and constructed an outdoor enclosure modeled after an enclosure at Skidaway Island State Park. Amos probably enjoyed the enclosure as much as Rocky; Rocky seem to like the additional sun and Amos like to steal Rocky’s uneaten food and water.

Rocky and Amos investigate the new enclosure.
Amos did not like to share his food with Rocky; listen carefully to hear Amos growl at his favorite turtle friend.

Where did he go?

The outdoor enclosure could have resulted in Rocky’s disappearance, and I hope that I didn’t negligently doom him with, what I thought, would be a more comfortable enclosure for him (there is biochemical evidence that enclosure substrate and size reduces stress in box turtles). I found a feather from a hawk in the yard recently—possibly a red-tailed hawk—and there is a Mississippi Kite that may have a next in the pine right above the enclosure. I haven’t read any accounts of predation of adult box turtles by hawks and the kites are relatively small, but I’ve heard some stories from the leader of TERPS, a project that rears terrapins at the Armstrong Campus, about birds of prey stealing smaller turtles. Predation is an awful and gruesome way to go for a turtle; most birds of prey wouldn’t be able to break the shell or otherwise kill the turtle quickly. There’s a slight chance he escaped and is still running around in my backyard. Maybe I’ll find him in the coming months sleeping under a bush. In any case, I enjoyed his company and hope that his captivity and disappearance weren’t stressful or violent.

Some Box Turtle Facts

Some interesting facts about eastern box turtles, all derived from Ernst and Lovich, Turtles of the United States and Canada, 2nd ed., 2009:

  • They can develop fevers in response to bacterial infections (fight the SARS-CoV-2)!
  • Its northern distribution, including Ontario, may have been facilitated by transport by Native American trade.
  • Hibernacula (burrows the turtles dig during winter to hibernate) are relatively shallow (max = 14 cm, average = 4 cm). Rocky used to hibernate under a bag of potting soil in my patio.
  • They’re freeze tolerant. Greater than 50% of their body water can freeze without injury with the help of increased glucose and cryoprotectant concentrations.
  • Home ranges vary widely, but estimates suggest about 5 hectares (12 acres or 9 football fields of forested habitat) per individual.
  • Males have been reported to die on their backs after rolling during mating or fighting for a mate. Rocky’s long neck regularly whipped around to efficiently roll him upright.
  • Reports of wild individuals are as high at 138 years old, and individuals some populations may live between 50-80 years, but other estimates put the range lower at 25-35 years.
  • Predators of adults are few, but juveniles are eaten by many different animals, from snakes to birds (like the Mississippi Kite and Bald Eagle).

It’s been eight years with my best friend

Eight years ago today, I adopted Amos. He’s been my best friend since, and, evidently, I have not stopped torturing him in the same ways.

Just a week after his adoption, I dragged him up a ravine at Southbend Park in Atlanta. I was craving some aquatic ecology and exploration, and he was already so attached that he followed willingly… well, that’s an overstatement; he was less than pleased, but felt no choice. He whined and cried about getting wet and trekking through boulders, but he moved forward and we had a grand time.

Today, we repeated our experience. As we explored a trail, we crossed an old friend–a fountain he’d previously fell in after being tricked by the thick duckweed. Hot, dusty, and thirsty, he immediately recognized the water below today, but was trepid—it could be any depth and the water’s surface was nearly a foot from the top of the fountain’s wall. I convinced him to let me help in, where he briefly cooled off and had a few licks of water.

He forgot about his previous experiences (with this fountain and with all things water and I). His confidence was built. It wasn’t so bad. It wasn’t so deep. And, boy, did it feel nice. Maybe he could jump in quickly on his own.

The depth of the fountain is not uniform, and, I am a cruel, cruel, person.

Thanks for being my dog, Amos.