Wednesday, February 20, 2013
Unusual Ducks On The Ohio River
Saturday, January 19, 2013
Long-Tailed Duck on the Ohio River
Monday, October 17, 2011
Mussel Fatigue
For the last two weeks I have been working on a survey for endangered mussels in the Ohio River. I usually enjoy snorkeling in smaller streams for these mollusks, but in the big rivers commercial divers have to do the fun work. They descend up to 60 feet (usually more like 30) into the brown depths. Divers are tethered to a long hose called an “umbilical”, which supplies air from a compressor on a boat at the surface. They often find themselves with their umbilical tangled in submerged piles of trees in water that is so murky that they can’t see more than an arm’s length in front of their face. It’s definitely a job for the adventurous.
Unfortunately, my job on this trip was to sit on the boat listening to the compressor rumble and breath exhaust all day while waiting for divers to bring up mussels. After spending a few 12-hour days on the bottom of the Ohio, several of the divers took to calling the way they felt “mussel fatigue.” Over the course of several of these mussel surveys I’ve been genuinely impressed with the interest that divers begin to show for mussels. It seems that if you have the opportunity to get aquainted with freshwater mussels as something more than stationary filter feeders, you find a group of very colorful animals that have a very interesting life cycle. Apparently you don’t have to be a complete nature geek to appreciate them!
It is much harder for the average person to become aquainted with the mussels of the Ohio River today than it once was. According to a map drawn in 1797 this part of the river was once four feet deep. It was probably a relatively clear, gravel-bottomed run with strong current. It’s hard to imagine this nowadays when you’re standing on a boat looking at a 30-foot deep, brown pool. Humans dammed the river, dredged it, and cleared much of its watershed for the plow. Sediment from farm fields and other eroding areas continues to clog the gills of mussels (mussels breathe through gills—like fish). These developments, plus industrial chemicals, sewage, fertilizers, pesticides, and other pollutants were hard on mussels. As a result several mussel species went extinct, and many others are considered endangered. Sixty percent of the remaining 300 (approximately) species of freshwater mussels in the eastern United States (which is the most mussel-diverse place on earth) are considered to be imperiled (endangered or threatened at the state or federal level). The mussels are definitely fatigued. That’s why we were doing this particular mussel survey—to help steer dredging activities away from healthy mussel beds and places occupied by endangered species.
Divers prepare to begin a mussel survey at sunrise.
A boatload of mussels of many shapes and sizes. In the end, we found evidence (live mussels and dead shells) of 30 different mussel species in one stretch of river.
The pistolgrip, a common mussel species of Ohio River drainages.
The sheepnose, a species that is a candidate for the federal threatened and endangered species list.
A relict shell of the ring pink, a species that is almost extinct.
A relict shell from a group of mussels (genus Epioplasma) which are mostly extinct as a result of changes humans wrought on our waters.
A freshwater snail (hornsnail) that is covered with zebra mussels, an invasive mollusk that is choking many aquatic organisms. The snail can barely get out of its shell, and this isn't even a really bad case of zebra mussels.
Sunday, January 16, 2011
Hayes Kennedy Park and Garvin Brown Preserve
It was another cold and windy day yesterday when we arrived at Hayes Kennedy Park. Being so close to the river made the wind even stronger. There is a little pond, more of a wet depression really, that runs from the parking lot to the end of the park. Usually this little spot is filled with all kinds of ducks but yesterday, in mid January, it was frozen. On the opposite side of the pond the songs of Eastern Meadowlarks can often be heard, but it was too cold and too early in the year to hear them. Blue Jays and Carolina Wrens were calling in the background, and several American Robins were picking at worms on the soccer field. With the pond being frozen and no ducks in sight, we decided to walk the well worn path to Garvin Brown Preserve to see what we could find.
Garvin Brown is a special kind of place. It isn't big, only 46 acres, but it has a certain charm. The preserve consists of several fields which are intersecting by paths that run along the edges and cut through the middle. It is often very wet and muddy here, but yesterday the ground was frozen and so was the mud. The preserve is special because it is an oasis of nature along a river crowded by development on both banks. This was the type of habitat that was here before settlers, when the river would occasionally overrun its banks and create this type of early succession fields composed of weeds and grasses.
Today, with the river tightly confined to its banks, mowing is used to keep the fields from growing into forests, and the fields are mowed in a rotational fashion. Rotational mowing is a tool used by wildlife managers to provide several types of habitat in one place. One field is mowed at a time while the others are left to grow wild. Each year a field is left un-mowed the more it changes, new weed and wildflower species grow, and with fields of several different ages a more diverse collection of plants are present. Wildlife enjoy having diverse habitats in close proximity because it allows them to exploit different resources without having to go very far. One recently mowed field may have certain grass seeds birds like to eat, while another older field may have plants that provide nesting material. The goal of rotational mowing is to create as much diversity as possible and to keep the area from becoming a monoculture. Below are some of the plants we found yesterday growing in different fields.
An old fence marks the boundary of the preserve. Mega mansions stand on the banks of the Ohio River to the north, but the area directly adjacent to the preserve is an old farm field with a few trees growing tall in the middle of it.
Garvin Brown is visited often by birders because it is a great place to find sparrows and warblers. Yesterday was no exception, though they were camera shy. We saw several species of birds belonging to the Emberizidae family (the sparrows) including: Song Sparrow, American Tree Sparrow, White-throated Sparrow, Eastern Towhee, and a Lincoln's Sparrow that responded to my pishing by bursting into song! It was so clear and beautiful and unexpected. Call me crazy but I swear I heard the song of a Common Yellowthroat as well. Wich-i-ty, wich-i-ty, wich-i-ty! Alas, I never found the bird making the song, and I'm not brave enough to proclaim hearing a Common Yellowthroat in January without at least getting a picture of it! Below are some of the birds we did see.
I will definitely be making a trip back in late March. That is when Garvin Brown comes alive. The flowers and trees will be blooming and the birds will be singing. Red-winged Blackbirds show up in force in March, singing for mates and defending territories, but perhaps the most interesting birds in March are the Tree Swallows. There are several Tree Swallow boxes at the preserve that provide nesting sites for these birds. Tree Swallows are very entertaining to watch because of their aerial antics. They swoop and dive and fight in mid air, all for the chance to court a female and raise a brood of birds in an old wooden box. Make it a point to come to Garvin Brown in late March, you will not be disappointed.
Before you leave be sure to check out the stairs that lead down to the banks of the Ohio. The shoreline was clean and there were shells and driftwood everywhere. It is a great place to relax and think in solitude, with the sound of the river lapping against the rocks, grass blowing in the breeze, and maybe even a barge or two slowly moving down the river. It makes you wish more of the shoreline of the Ohio River was dedicated to nature.
On the way out we spotted an oriole nest high in a tree. Orioles weave cup-like nests on the ends of branches, making it harder for predators to reach. Just think, only a few more months before the orioles will be back and at it again. I'm really looking forward to spring.
8:46 PM

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