OPEN RANGE

In 1985 when we bought our Decatur County land we had city dwellers’ concept of land ownership.  You pay for a property, get the deed and it’s yours.  That’s not true in southern Iowa.  Our 200 acres was located in the heart of 1200 acres of prairie and woodland that had always been open range. From the pony farm to the north, across Brush Creek through our property and south, west and east this was prime deer and turkey hunting land.  Just because we had paid for the land didn’t mean we could own it.  We had no right to keep people who’d always hunted here off.

Timberhill in 1985

We learned this lesson early on.  Before building the house in 1993, we spent weekends away from Des Moines in a nearby rental.  It was our habit to take a long walk on our property each morning. One morning as we came up the trail from the Brush Creek bottom we heard the unmistakable click of a shotgun round being chambered and were confronted by two hunters pointing their guns in our direction.

“What are you doing here they asked?  Don’t you know any better than to walk through here during deer season?

Although we had clear title to the property, hunters were a constant presence especially during white tail deer and wild turkey seasons. They, too, had invested in our property by building shooting stands in the walnut and oak trees along Brush Creek.  We accepted  the poachers as a fact of life in the country, and  it wasn’t until we built our house that we tried to control access to our property. We built a heavy galvanized tube gate across the south entrance to our property.  Affixed to the gate was large sign, “Private Property” and a chain and padlock that secured it to the fencepost. That only made things worse.  Two nights in a row after the gate was in place I was awakened by a pickup driving north past the house.  Our neighbor had broken down the gate to let us know that even though we thought we owned this property  it was still open range.   We’ve learned our lesson.  We keep a low profile and leave the gate open.

Trail across Timberhill from the south gate

Taking Stock

As year end approaches Bill and I will compile an annual report of our  progress toward restoring Timberhill.  The report will list new species collected in 2011, changes we have observed, and  advancement toward our restoration goals.  In order to make the best use of our time in the coming year we have to prioritize. In 2012 restoring the wetland and fen on the east and west sides of West Creek will continue to be the highest priority.  It is also our greatest challenge.   This site includes spring fed bottom wetlands and a hillside fen. We have enough experience restoring overstocked savanna to know how to proceed and what to expect.  But restoring wetland is beyond our expertise.  We have no idea what to expect. So we’re learning through trial and error and using instinct to guide us.

When we purchased the West Creek unit in 2004 the creek bottom, wetland, and fen were overgrown with honey locust and invaded by multiflora rose. The hillside above the pioneer spring was a dense stand of Eastern red cedar.  Furthermore, erosion from uphill cornfields had cut a deep ravine that bisected the West Creek unit. At the bottom of the erosional run was a small stand of prairie cord grass and sedge.  In 2011  the erosional run continued to decrease as the cover of  prairie cord grass and sedge increased.

Timberhill aerial with blue line indicating creek

In 2004 we introduced annual prescribed burns to control invasive plants and tall shrubs,  stimulate return of native plants, and restore the natural hydrology.    Other than girdling and removal of honey locusts we did no further clearing for three years, giving our  annual dormant season burns time to control some of the invasives.  In winter, 2007, we thinned the remaining trees except the elms which we left for morel habitat.  (They will die of their own accord and produce morel mushrooms as they die.) In August, 2007,  we burned the downed Eastern red cedars on the hillside above the pioneer spring.  Burning them while the surrounding plants were still green made the fire easy to control.  Not only have remnant populations of  native forbs, sedges and  warm season  grasses increased  on that hillside, but the contours have softened.  What had been a sharp drop to the creek has become a gentle slope.  Most interesting have been the changes around the pioneer spring.  The land between the spring and the creek is now dotted with seeps.

 

Seep that has developed below the pioneer spring. Note water dripping on right side.

On the east side of the creek we have made some progress, but it’s very slow.  The biggest problem is running fire through this area.  Only small sections at north and south end have burned.  In the north burned section Long-scaled tussock sedge, Carex haydenii, is out competing the other plants and slowly moving through the brush to the north fence line.  Fire has also stimulated clumps of Wood reed, Cinna arundinacea,  under the shingle oaks at the south end.  But the center portion is still a tangle of dead elms, invasive vines and multiflora rose.

 

We've made little progress in this center portion of the east side.

The most interesting new species we found this year was an Albatrellus, a polypore mushroom.  Polypores are usually found growing on wood, but this species was terrestrial, fruiting from the ground in the West 40 woodland,   It is also mycorrhizal, having a symbiotic association with trees.  A search of   the Iowa State University herbarium fungi database lists only two Albatrellus records:  1927 collection in a Webster County woodland and a 1936 Johnson County collection.   The specimens I collected were too immature to key.  Hopefully, this interesting mushroom will fruit again next year when I will know enough to let it mature before collecting.

Albatrellus mushroom

LASIOGLOSSUM VERSATUM: DIVORCE BEE STYLE

On a recent sunny day Bill and I had the unexpected pleasure of following naturalist Laura Rericha on walk through our restoration.  Laura and Dr. Gerould Wilhelm were co-authors of the 2007 Timberhill Savanna:  Assessment of Landscape Management.   It was by watching and listening to them in the field that I  gained a true understanding of savanna restoration.

Laura and Jerry’s first visit to Timberhill was in 2003, ten years after Bill and I had begun restoring Timberhill.   Although we were having excellent results from our management, others were highly critical of our methods.  We were told that we should be planting savanna indicator species, and that we were burning too frequently at the wrong time of year.   In any case it didn’t  matter since everyone knew there were no oak savanna remnants worth saving in Decatur County, Iowa.

Thanks to Jerry and Laura that has all changed.  On his first visit in June, 2003, Jerry noted 206 native vascular plants.   (Finding 180 species in a single survey usually indicates a high quality remnant.)   When Laura surveyed the ants for the Timberhill study she identified fifty two species, two of which were new to the Iowa list.  (The Iowa lists contains 100 species.)    Laura and Jerry’s work  gave Timberhill legitimacy.

On her own initiative Laura has mastered  ornithology, botany, and myrmecology.  Her current research is surveying the native bees of the Midwest.    Wild native bees such bumblebees and sweat bees evolved with the plants they pollinate.   They are seriously threatened by loss of natural habitat. Currently  four dozen native wild bees are listed on the Xerces Society’s red list.

L. versatum worker bee looking for a home

Thanks to Laura, Bill and I were able to observe the behavior of Lasioglossum versatum  a greenish black sweat bee that nests in the soil.  She pointed out swarms of Lasioglossum versatum workers circling over and around small holes in the soil.  The holes were entrances to an aggregation of L. versatum nests that spread over the trail and into the adjacent woodland.

From a small entrance (3-5 mm.) in the soil the nests extend underground through tunnels  with  branch burrows and individual cells for  eggs and larvae.  Several fertilized queens hibernate in each nest during the winter and will produce the next generation the following spring.  (They do not tunnel new nests each year.) As winter approaches the queens must prepare for propagation of their species.

When they sense cold weather approaching the queens drive the worker bees out of the nests.  After hard frost there will be no more flowering plants to supply the bees’  pollen.   To survive diapause with enough food for the larvae the queens must drive the workers out of the nests.    Fascinated we watched the worker bees frustration as they swarmed over and around the nest aggregation.  Whenever a worker came close to nest entrance a  queen’s head moved into the opening, blocking the hole.    The queens will continue to guard the nests until there is no longer any threat of the workers returning.

L. versaturm queen blocking nest entrance

Were we to follow the  protocol of burning every three years we would probably not have been able to observe this drama.  The ground would have been covered with leaf duff, obscuring the nest entrances.  Would Lasioglossum versatum even be nesting here if the ground was covered with dead leaves?

 

Reference:  Charles D. Michener. “The Bionomics of a Primitively Social Bee, Lasioglossum versatum (Hymenoptera: Halictidae).  Journal of the Kansas Entomological Society. Vol. 39, No. 2 (Apr., 1966), pp, 193-217.

Timberhill Map: Finding the Boundaries

Timberhill Map

When our lawyer did a title search prior to closing on our first purchase of Decatur County land  he warned,

“Be careful they don’t slip an extra forty acres in on you.”

Our lawyer believed that land was only worth buying if it could  produce an income.  The overstocked woodlands we had purchased had no value except for  hunting and harvesting firewood.   But to Bill and me the land was beautiful.  I’ll never forget walking the East Savanna trail the day after we closed.  Falling leaves brushed my shoulder as I walked up hill under a canopy of oak trees.  I couldn’t believe this mosaic of woodlands and prairie openings was really ours.

In 2001 when we were negotiating to purchase the West 40 we sought advice from an appraiser regarding price.  Looking across the fence at the W40  hickory woodland overgrown with eastern red cedar and honey locust he shook his head in disgust.  Why would we even consider buying such worthless land?  But  the West 40 not only had wildflowers such as purple prairie clover and bottle gentian not found on our east property but there was a remnant white oak and bur oak savanna.  We also knew that the West 40 had never been plowed.

Since our land was considered so worthless no one had ever located the exact boundaries.  The only permanent survey markers mounted on steel posts designated an abandoned right of way that used to run through the middle of the east savanna.  Whatever the original Government Land Office surveyor had available when he surveyed the property in 1847  marked the rest of the survey points.  For example,  a harrow bar marked the southwest corner between the West 40 and West Creek.   The northwest corner was marked by a buggy axle buried in the creek, the southeast corner a buggy pole brace.  A wringer spindle (iron spindle of a wringer washer), chips of crockery or a peg fashioned from the wood of a nearby tree  and placed under a large stone marked other survey points.  To quote the survey map, “a stone “under E & W fence about 2 feet west of fence line south”, and “stone & jig under gray boulder”.

Permanent survey marker on steel post between fencelines

There were fence lines but they were confusing.  At the  corner between the east property and the West 40 the east fence line  ended forty feet south of  it’s continuation to the west.   A road that used to run along this line had been abandoned in 1938 and the property divided between the landowners.   But the owners kept the fence lines where they were, one that ran on the south side of the road and another on the north.   When we purchased the West 40 we asked the county surveyor to mark the corners with permanent survey markers.   Standing near where he thought the buggy pole brace might be he swung the metal detector back and forth until it indicated buried metal.  With a shovel he found  the buggy pole brace and set  a permanent survey marker 1 foot south to the south.  The exact location  of the survey point was noted on the permanent survey record.    To find the northwest corner he had to wade into the creek.  This time he set the permanent survey marker south of the actual survey point  and drove nails into a nearby post and box elder  from which another surveyor could shoot the actual survey point.

Since then Decatur County land such as ours has increased in value.  However, the increased value is not in its beauty or restoration potential but its ability to produce deer.  We are now surrounded by hunters who have paid up to $3000 per acre for private hunting grounds.  They know exactly where the boundaries are and monitor them  constantly with trail cameras to deter poachers.

A Timberhill Tour: Hidden Prairie

West 40 with Hidden Prairie

One of the pleasures of restoring Decatur County overstocked savannas is finding hidden treasure.  The Hidden Prairie is such a treasure.  Completely surrounded by woodland it had remnant populations of many conservative prairie plants such as purple prairie clover.  Bordered by our south property line, it covers a west facing hillside overlooking West Creek, part of a forty acre track we purchased in 2005. The property to the south is a mature overstocked savanna remnant, but there were no veteran oak trees on our portion of the land surrounding this prairie.  Only 75 year old shingle oaks. (It may have been logged off in the nineteenth century.)

At the time of purchase Rattlesnake master dominated the upper portion with more mesic plants such as bottle gentian at the lower end above the creek bottom. A stand of shingle oaks extended into the prairie dividing it into two parts.   We began managing it before we owned it.  Whenever we burned the West 40 unit we used West Creek as a fire break.  Since the Hidden Prairie is between the West 40 and West Creek it has been burned annually since 2002. After we purchased it we cut down the shingle oaks that divided the prairie and thinned a stand of shingle oaks between the prairie and the south fenceline.

The above photograph of the Hidden Prairie was taken before restoration. Since then it has doubled in size. The Rattlesnake master has declined. Prescribed burns have stimulated the warm season grasses and sedges.  Virtually all rainfall is now absorbed into the soil and the natural hydrology has been restored.  Even in dry weather plants have a consistent supply of water from the groundwater seeps.  The shingle oaks cannot tolerate these mesic conditions and are dying.  The Hidden Prairie is gradually extending its border uphill to the east.

Hidden Prairie in June

We have no idea how far it will go. There are two more prairie remnants along the south fence line, above (east)of  the Hidden Prairie.  All that separates them are shingle oaks.  As the shingle oaks die I assume the Hidden Prairie will become linked with the other remnants. A few young bur oaks are becoming established there as well.  Perhaps this prairie has a savanna in its future.  In any case it is fascinating to watch the transformation.