Author: Camilla Sherman

Weekly Wildlife Report, March 24th

Weekly Wildlife Report, March 24th

By Liam Wolff, Phinizy Research Intern

This week has been a great week for herps! Snakes, turtles, lizards, skinks, alligators, and frogs abound (no pun intended) in the park. As usual, the most common snake is the Cottonmouth, but Brown Watersnakes are present as well. Ribbon Snakes and Rough Green Snakes are likely out also. Turtles can be seen basking just about anywhere on logs or vegetation. Species of turtle seen this week include: Common Snapping Turtle, Mud Turtle, and Yellow-bellied Slider. Carolina Anoles are everywhere, showing off their flashy red dewlaps ostentatiously. Species of skinks seen this week include Ground Skink, Broad-headed Skink, and Five-lined Skink. The alligators are, as always, in the Clarification Pond. This week at least 4 have been seen in the pond simultaneously, ranging in size from ~4ft to >10ft. Frogs can be seen and heard around Butler Creek and in the constructed wetlands, including species such as Green Treefrog, Bullfrog, and Cricket Frog.

Bird activity has not changed much since last week. Buffleheads, Lesser Scaup, and Blue-winged Teal remain in the Equalization Pond and Yellow-throated Warblers and Northern Parula sing from the trees there and on Cattail Trail. White Ibis have been flocking at the oxbow with Great Blue Heron and Great Egret. Bitterns were seen on Cattail Trail. Concerning raptors, Kestrels, Barred Owl, Red-tailed, Red-shouldered, and Cooper’s Hawk, and Northern Harrier have been noted. Other birds of note include: Sora, Pileated Woodpecker, Marsh Wren, and Brown-headed Nuthatch.

Butterflies seen this week: American Snout, Eastern Tiger, Black, and Zebra Swallowtail, Broad-winged and Fiery Skipper, American Lady, Variegated Fritillary, Cabbage White, Cloudless Sulphur, and Common Buckeye. Damselfies seen this week: Rambur’s Forktail and Fragile Forktail. Dragonflies were seen as well, but not identified to species.

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River Research & the Boat that Makes a Difference

Lagrangian Houseboat

The Original Houseboat

There are two different ways to measure and assess water quality in river systems: one way is to measure continuously from fixed locations along a river, and the other is to measure continuously from a location that moves downstream with the river current. Through generous contributions from public and private partners, Phinizy Center has been measuring water quality since 2006 from 9 locations along the Savannah River, starting seven miles below Thurmond Dam (River Mile 214) to the I-95 bridge (River Mile 27) (see Continuous River Monitoring). In 2012, we began measuring water quality using the “river current” perspective by equipping a 30-foot houseboat with scientific instrumentation and floating, at river speed (about 3 feet per second), for over 145 river miles, which took about 5 days. That river expedition allowed us to capture very important data related to how quickly bacteria in the river process wastewater from Augusta to a few river miles above Savannah. The boat we used to do that important research was rather old, but it allowed us to do this important work, once!

In 2014, a conversation between Mr. Gary Swiggett, a boat insurance agent, and one of our Board members, Dr. Michael Ash, resulted in an excellent opportunity to purchase a boat better suited for our needs. Through a generous price reduction from the boat manufacturer, Premier in Wyoming, Minnesota, and generous philanthropic contributions from The Knox Charity Fund, Creel-Harison Foundation, and Wells Fargo, we were able to purchase the boat which arrived a week ago from Minnesota.

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We would again like to thank all of those who made this opportunity happen and we look forward to sharing the data with all of you from the river!

Weekly Wildlife Report, March 17th

Weekly Wildlife Report, March 17th

By Liam Wolff, Phinizy Research Intern

Love is in the air. Breeding is occurring all over the park. Damselflies can be seen in tandem and the Ospreys are on their nest, likely incubating their eggs already. American Coots have been seen carrying nesting material as well. Birds are singing all over the park! The Equalization Pond is still quite empty. However, a handful of Lesser Scaup and Blue-winged Teal remain in addition to the pair of Buffleheads seen last week. Gadwall were seen for a couple days early in the week. Also present here was a Lincoln’s Sparrow – a rare migrant in the park, only seen a few times in Richmond County. Cattle Egret and Barn Swallow have returned and straggling Rusty Blackbirds are still at the Equalization Pond. On the Constructed Wetland Trail there are snakes: Brown Watersnake and Water Moccasin. American Alligators are present in the Clarification Pond and the Equalization Pond, as always. Spotted Sandpipers are hopping around in the clarification pond as well. Butterflies seen this week were Common Buckeye, Cabbage White, Zebra Swallowtail, and Eastern Tiger Swallowtail.

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Weekly Wildlife Report, March 11

Weekly Wildlife Report, March 11

By Liam Wolff, Phinizy Research Intern

There have been many new arrivals this week. The very warm weather has brought all sorts of insects out. The first butterflies of the year are everywhere – Red-banded Hairstreak, Cabbage White, Zebra Swallowtail,and American Lady are just a few species seen. Damselflies and dragonflies have increased in occurance as well. Rambur’s Forktails, Eastern Pondhawk, and Skimmers are seen all over the park. A Longhorn Beetle was caught right outside the research building, and moved to the forest.

Herps are active. Green Treefrogs are commonly seen perched on bulrushes and other species of frogs can be heard calling in the wetlands. One very peculiar finding was a 36-inch Two-toed Amphiuma dead on Cattail Trail. It was retrieved by research, showing signs of a large wound on the head, but the exact cause of death is unknown. Alligators are out as usual in the Clarification Pond. One large adult, estimated to be around 9ft or more in length tends to bask on the front, left side of the pond. Snakes are out. Water Moccasins and Black Racers have been seen this week.

Birds have some new arrivals as well. Although most of the waterfowl have left the Equalization Pond, three Bufflehead (a drake and two hens) and a pair of Gadwalls have graced the pond with their presence. A few Lesser Scaup, Blue-winged Teal, and Northern Shoveler remain. American Bitterns are still calling from the sparrow field and one was flushed by the 3 Ton Bridge. Red-tailed and Red-shouldered Hawks are active, along with Osprey and Barred Owl. King Rail are calling from the wetland cells late in the day. Songbirds are on the move as well. Marsh Wren are singing in the bulrushes, Yellow-throated Warblers and Northern Parulas are declaring their presence in the trees, Yellowthroats are calling from the brush, and other songbirds are foraging in the trees for food: Black-and-White Warbler by campus, Brown-headed Nuthatch by the Bridge Through the Woods, and Savannah, Swamp, White-throated, and Song Sparrow in the wetlands.

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Snake Myths Debunked

Snake Myths Debunked

By Aaliyah Ross, Environmental Educator

Snakes are among the most misunderstood groups in the Animal Kingdom. Here are four common myths about snakes and the science that debunks them.

Copperhead by Rebecca Gray

Copperhead by Rebecca Gray

Myth #1: You should be worried about snake bites in Georgia.
Reality: You are very unlikely to be bitten by a snake unless you harass it.

In the words of renowned herpetologist Clifford Pope (1899-1974), “Snakes are first cowards, then bluffers, and last of all, warriors.” When threatened, snakes employ a variety of defense mechanisms, including fleeing, hissing, tail rattling, striking without biting, musking, and playing dead. Even for venomous snakes, biting is often a last resort. A West Virginia University study (Morandi and Williams, 1997) found that the vast majority of snakebites occurred when individuals harassed or attempted to kill a snake. Forty percent of snakebite victims had consumed alcohol before being bitten.

Cottonmouth

Cottonmouth by Liam Wolff

Myth #2: Cottonmouths are very aggressive.
Reality: Cottonmouths are no more likely to bite than any other snake.

If you’ve had the pleasure of enjoying a warm spring day at Phinizy, chances are you’ve probably seen a cottonmouth. Also known as water moccasins, these snakes are abundant throughout the park and are easily spotted in warm months. You may have heard that they are aggressive and are more eager to bite than other snakes in our area. However, a study conducted at the Savannah River Ecology Laboratory (Gibbons and Dorcas, 2002) concluded that cottonmouths are much more likely to use other defense mechanisms when threatened.

Researchers subjected cottonmouths to three different treatments:
• Stand beside snake with boot touching its body (Resulted in 0 bites out of 13 snakes tested)
• Step on snake (Resulted in 1 bite out of 22 snakes tested)
• Pick up snake with tongs modified to resemble human hand and arm (Resulted in 13 bites out of 36 snakes tested)

Rattlesnake

Rattlesnake

Myth #3: You can determine a rattlesnake’s age by counting its rattles.
Reality: Rattlesnakes gain a rattle each time they shed.

Snakes regularly shed their skin when growing (humans do as well, except our skin sheds continuously and in very small pieces, whereas snakes shed all of their skin at once). Snakes can shed multiple times in one year. Younger snakes grow faster and shed more often, but older snakes grow slower and shed less frequently. In addition, rattles can break off. Therefore, you can conclude that a rattlesnake with 8 rattles has shed at least 8 times, but you cannot tell how old it is. Speaking of rattlesnakes…

Myth #4: Someone on the internet killed a 10-foot rattlesnake!
Reality: 10-foot rattlesnakes don’t exist.

The largest rattlesnake on record was 8 feet long. Specimens longer than 6 feet are rare in the wild. If you’ve seen an email or internet post claiming to show a picture of a much larger rattlesnake, it was most likely due to a photographic illusion known as “forced perspective.” When a snake (or any object) is held closer to the camera than the surrounding objects, it appears much larger in comparison. For more information on forced perspective, visit http://www.livingalongsidewildlife.com/2009/07/return-of-giant-killed-rattlesnake.html

Herpetology squareWe hope that debunking these myths gives you a better understanding and appreciation of these oft-maligned reptiles. If you want to learn more about our local reptiles and amphibians, sign up for our Spring Field Herpetology course!

Weekly Wildlife Report – March 4th

Weekly Wildlife Report – March 4th

by Liam Wolff, Phinizy Research Intern

Alligators are out in higher numbers. Although the two at the Equalization Pond weren’t seen this week, three or more have been seen at the Clarification Pond on the black tarp with Spotted Sandpipers. Turtles are out and an armadillo was seen on the impoundment by the Distributional Canal. As far as birds go, American Woodcocks can be heard at twilight, calling their “PEENT” calls and twittering courtship display in the Sparrow Field. Also heard in the Sparrow Field are American Bitterns and Common Ground-Dove. The rest of the swamp remains like last week. There are many ducks still in the Equalization Pond – Northern Shoveler, Ring-necked Ducks, Lesser Scaup, and Blue-winged Teal. Also on Pond Trail are Pileated Woodpeckers, Brown-headed Nuthatch, Swamp Sparrow, Song Sparrow, Golden-crowned Kinglet, Ruby-crowned Kinglet, Red-winged Blackbird, Common Grackle, and Blue-headed Vireo. The Black-crowned Night-Herons have been seen off-and-on in Cell 3. Raptors are still active as well. Red-shouldered Hawk, Osprey, Northern Harrier, Bald Eagle, Red-tailed Hawk, Cooper’s Hawk, Black Vulture, Turkey Vulture and Barred Owl have been spotted this week. Yellow-throated Warbler have finally arrived. Other birds of note include: Sora, Gadwall, Orange-crowned Warbler, Baltimore Oriole, Wood Duck, Fox Sparrow, and Wilson’s Snipe.

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Weekly Wildlife Report: February 26th

Weekly Wildlife Report: February 26th

By Liam Wolff, Phinizy Research Intern

Despite the wind and storms we have been having, the wildlife has still been active. Some have even been enjoying the strong winds. Harriers and Vultures have been taking advantage of the drafts, tossing back and forth in the wind. Otters have been seen in the equalization pond and by the 3 Ton Bridge. Armadillos have been reported as well. Alligators are still out basking on the banks. Some are in the Equalization Pond and the Clarification Pond as usual, but a large one was seen in the Distributional Canal. Ducks are still present in large numbers in the Equalization Pond – Ring-necked Ducks, Lesser Scaup, Blue-winged Teal, and Northern Shoveler. One surprise find was a Ring-billed Gull sitting on the float in the center of the pond. This species is common here, but they are not usually found at the Equalization Pond. Raptors are still very active – Bald Eagles fly over the wetlands often, harriers glide low over the cells, Red-shouldered Hawks are in a frenzy, preparing for nesting, Ospreys are doing the same, and Red-tailed Hawks, Black Vultures, and Turkey Vultures are present too. The Kingfisher is still hanging around the end of the Distributional Canal, which still holds many coots and gallinules. Wood Ducks are inhabiting the wooded swamplands near the River Scar Trail. Passerines have been skulking in the bushes to avoid the wind, but House Wren, Blue-headed and White-eyed Vireo, Black-and-White Warbler and Orange-crowned Warblers, and Eastern Bluebird are some songbirds of note seen this week.

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Life History of the Larva of the Glassworm

Life History of the Larva of the Glassworm (Chaoboridae)

By Liam Wolff, Phinizy Research Intern

Phantom Midge by Peter Maguire

Phantom Midges by Peter Maguire

The Phinizy Center for Water Science’s research projects often includes studying the diversity and abundance of certain macroinvertebrates. In the Oxbow Lakes left behind by the Savannah River, one type of midge larva is particularly common in the sediment samples that are collected. In fact, this midge makes up a large percentage of organisms found and counted in the sediments of the Oxbow Lakes.

The Glassworm, also known as the Phantom Midge due to its transparency, is a small insect from the family Chaoboridae. Closely related to the ever-ubiquitous Chironomidae, it is small and worm-like in its larval stage, inhabiting rivers and other natural water sources, such as the Oxbow Lakes along the Savannah River. However, the glassworm has a fascinating life history – one unlike most other insects.

Phantom Midge by Peter Maguire

Phantom Midges by Peter Maguire

One of the main things that sets the glassworm apart is its diel vertical migration. This transparent creature spends the daytime in the depths of the hypolimnion – the bottom layer of the lake – poking its head out of the dense sediment, feeding on zooplankton swimming by. However, after twilight the glassworm migrates from the sediment to the epilimnion – the uppermost layer of the lake. Two pairs of air sacs control the larva’s bouyancy and are used to move up or down the stratification zones. The exchange of gases from these airsacs are actually audible, taking up much of the perceptible frequencies underwater at dusk. One of the reasons Chaoboridae exhibits this behavior is because its prey does as well. Zooplankton migrate to the epilimnion at night due to changes in temperature and light.

Microscope photo of two glassworms dyed with rose bengal dye from the oxbow lake Possum Eddy. Photo by Liam Wolff.

Microscope photo of two glassworms dyed with rose bengal dye from the oxbow lake Possum Eddy. Photo by Liam Wolff.

Another motive for the Phantom Midge larva to return back to its abode in the hypolimnion at dawn is to escape predation from fish. In fact, some claim this is the primary reason that Chaboridae display diel vertical migration (DVM). One study showed that glassworms in the genus Chaoborus only partook in DVM in the presence of fish (Larson 2016). In a pond devoid of fish, no glassworms were found to demonstrate their nightly migration. How the larvae are aware of the prevalance of fish is explained by chemicals signals sent out by fish called Kairomones that the glassworms can detect. Since fish cannot tolerate the low levels of oxygen in the sediments of lakes, the glassworm hides in the hypolimnion from dawn until dusk. In fact, with the exception of zooplankton, most organisms cannot tolerate the anoxic waters of the sediment. The only way the glassworm can survive is by producing energy (ATP) through an alternate route (anaerobic malate cycle). This makes them tolerable to more polluted, less healthy water bodies.

One other reason the glassworm is unique is because it has a huge impact on the community of zooplankton. Although Chaoboridae feeds mostly on rotifers, copepods and cladocerans make up a large percentage of its diet as well. During its various instar stages, the glassworm tends to prefer different types of zooplankton. This helps regulate the abundance and diversity of zooplankton in lakes, rivers, and streams.

See more photos of the Phantom Midge by Peter Maguire in his online album.

5 Ways to Help our Pollinators

5 Ways to Help Our Pollinators

By Jen McGruter, Environmental Educator

Pollinators around the globe are declining, and this could have major implications for overall crop yields, food supplies, and even human welfare in the years to come. How can you be a part of the solution? Small changes can end up making a huge difference in the long run.

  1. Marshmallow-bee_9592Decrease the use of pesticides. Even small doses of chemicals can be harmful to an entire colony of honey bees if carried back to the hive. There are many mixtures of essential oils that can be used to deter certain pests, or the introduction of ‘good bugs’ can help eliminate certain aphids and other unwanted bugs if needed.
  1. Provide nesting sites in your yard. Different pollinators have different needs for nesting sites. Some bees are ground-dwelling and just depend on undisturbed patches of soil to live. Other bees nest in cavities made in wood. Simply providing trees and shrubs in your yard for hummingbirds to nest can help out, as well.
  1. Rufous Hummingbird by Liam Wolff

    Rufous Hummingbird by Liam Wolff

    Plant native species in your landscape. An entire pollinator gardens’ worth if you can! Native plants are more likely to serve as larval host plants for more pollinator species, and will attract more native pollinators to your yard.

  1. Remove exotic and invasive species. Many invasive species have the ability to out compete native plants, and have devastating effects on entire ecosystems. Many native pollinators cannot utilize non-native species in the same ways they can native plants. Before you plant ornamentals in your landscape, be sure they aren’t on the invasive species list!
  1. Talk about it with your friends! The more we begin to realize the problem exist, the sooner we can work together to prevent future declines. Become informed and be an advocate for our pollinators!

Weekly Wildlife Report: February 19th

Weekly Wildlife Report: February 19th

By Liam Wolff, Phinizy Research Intern

This week we have had incredible Spring-like weather. A small taste of what’s in store for the next few months. We aren’t the only ones enjoying the warm weather, though. Ectothermic animals have been much more active. Alligators have been seen basking in their normal spots in the far end of the Equalization Pond and on the tarp in the Clarification Pond. Anoles have likewise been active, warming themselves up in semi-exposed areas. Turtles have also become once again ubiquitous. Snakes are out, too. On campus, a little Brown Snake was found and Cottonmouths can be seen basking on the banks of many of the ponds and along Butler Creek. As far as birds go, waterfowl are, as always, inhabiting the Equalization Pond. Ducks in this pond include: Lesser Scaup, Northern Shoveler, Ring-necked Duck, and Blue-winged Teal. Also at the Equalization Pond are Brown-headed Nuthatches, Orange-crowned, Palm, and Yellow-rumped Warbler, Common Yellowthroat, Rusty Blackbird, and Ruby- and Golden-crowned Kinglets. One bird of note at this location was a black and orange songbird in the trees on the east side of the pond. The bird was first identified as a Western Tanager, but the observer conceded that the bird might be a Baltimore Oriole. The bird was not relocated. Birds of prey are active as well. Osprey, Bald Eagle, Red-shouldered Hawk, Black and Turkey Vulture, Northern Harrier, Red-tailed Hawk, and Barred Owl have all been spotted in the park this week. Tree Swallows have finally returned! Two were spotted over the Equalization Pond on Friday. White Ibis have been seen perching in the cypress by the boardwalk on Cattail Trail, napping and grooming. Other birds of note include Gadwall, Marsh Wren, Winter Wren, and Pileated Woodpecker.

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