WILLISTOWN CONSERVATION TRUST

GIVE

Capturing a Snapshot of Darby Creek

By

By WCT Conservation Research and Data Specialist Anna Willig 

At the beginning of November, the Watershed Protection Program at Willistown Conservation Trust (WCT) partnered with the Darby Creek Valley Watershed Association (DCVA) and, together, enlisted four volunteers to conduct a sampling “blitz” in the Darby Creek Watershed. With the help of our determined volunteers, we collected samples from 19 previously unstudied sites in two hours (Map 1). Once the volunteers collected the samples, everyone met at the Upper Main Line YMCA’s Artisan Village to analyze water quality and discuss the results. 

Our Team (from left to right): Charlie Coulter (volunteer), Anna Willig (WCT, author), Lauren McGrath, Michelle Lampley (UMLY), Deirdre Gordon (volunteer), Lloyd Cole (volunteer), Dale Weaver (volunteer), and Aurora Dizel (DCVA).

Darby Creek originates in small tributaries along the Route 30 corridor from Easttown to Ardmore which flow together as the stream makes its way towards John Heinz National Wildlife Refuge where it meets the Delaware River. Throughout its length, Darby Creek flows through many highly developed areas, picking up road salts, fertilizers, and other pollutants from lawns, parking lots, and roadways. 

Despite these threats to the health of the stream, few community science studies have been completed to understand the health of Darby Creek and all of its tributaries. To shed some light on the water quality in the Darby Creek Watershed, the Darby Creek Community Science Monitoring Program was launched in 2021 in partnership with DCVA and under the scientific guidance of Stroud Water Research Center. To date, volunteers have been trained to collect high quality water chemistry data at 15 sites throughout the entire watershed every four weeks. 

The sampling blitz, which covered 19 sites in the headwaters of Darby Creek, allowed us to gain even more information on water quality while controlling for weather conditions. Rain, heat, and other weather conditions can impact water quality measurements. By sampling at a single point in time, we can capture differences in water quality between sample sites rather than changes caused by time. Many of the sampling sites were located on small tributaries, allowing us to study how fine-scale differences in land use upstream of the sample site can impact water quality. 

One of the goals of the sampling blitz was to understand salt pollution in the headwaters of Darby Creek. Road salts applied in the winter end up in streams as snow and ice melt and flow into the nearest waterway. Salts can build up in groundwater and soils, resulting in long-term increases in salt concentration in streams, a phenomenon known as freshwater salinization. Freshwater salinization is occurring across North America, and increases in salt concentration threaten the fish, insects, mussels, and other organisms living in streams. By measuring salt concentration in November, before winter road salts are applied, we capture baseline concentrations that reflect long-term buildup of salts in soils and groundwater. 

The results of the sampling blitz indicate that salt pollution (as measured by chloride concentration) varied widely across the headwaters of Darby Creek. Chloride concentration ranged from 34 ppm to 230 ppm (Map 1). The lowest chloride concentration was measured at Site 19, a site located on Camp Run, a small tributary to Darby Creek. The area that drains into Camp Run is predominantly agricultural land, with some sections of limited residential development and forest. By contrast, chloride concentration was highest at Site 2, a site on an unnamed tributary. The land that drains into Site 2 is similar to the size of the Camp Run watershed, but is much more developed. The tributary originates near a SEPTA train station and flows under Route 30, picking up salt and contamination from residential and commercial developments. Identifying pollution hotspots, such as Site 2, can help determine areas that should be targeted for future restoration. 

Map 1. Sample sites in the headwaters of Darby Creek. Each point represents the approximate location of a sample site and is colored by the chloride concentration at that site. Low chloride concentrations are represented by pale yellow, with high chloride concentrations represented by a dark red. The red box indicates the sample area.

Another indicator of water quality that volunteers measured was specific conductivity, which reflects how well electricity can move through water. Pure water is a poor conductor and has a low conductivity. As more ions are added to the water — from pollutants such as salts, fertilizers, and heavy metals — conductivity increases. Conductivity also varied greatly between sites, ranging from 325 to 967 μS/cm. While a higher conductivity indicates a higher concentration of pollutants, it does not indicate the type of pollutant. When chloride (which is an ion that increases conductivity) is compared to conductivity at each site, we found that there is a strong relationship between the two measurements (shown by the trendline), indicating that salt pollution is the biggest driver of conductivity in the headwaters of Darby Creek (Figure 1). However, there are two sites, Site 1 and Site 9, that do not quite follow the relationship. Further research is needed to understand what is driving conductivity at these sites. To learn more about conductivity, check out the State of Our Streams Report. 

Figure 1. The relationship between chloride concentration and specific conductivity in the headwaters of Darby Creek. Each point represents a chloride concentration and specific conductivity measurement taken at a sample site. Points are colored by site. 

The results of the snapshot survey indicate that water quality is highly variable in the headwaters of Darby Creek. Sites that drain the highly-developed Route 30 corridor, such as Site 2 and Site 5, have relatively poor water quality, while sites that drain areas with more open space, such as Site 18 and Site 19, have much better water quality. The variability in water quality within a small section of the Darby Creek Watershed highlights the deep connection between local land use and stream health. Protecting areas of open space, especially in small tributaries, is crucial to maintaining and improving water quality throughout the entire watershed. 

Additionally, increasing awareness of threats to water quality, such as winter road salt application, can help to reduce the impact on local streams. To reduce road salt contamination in streams, avoid over applying salt and sweep up any salt that remains after snow and ice have melted. The salt can be reused for the next winter storm, saving money and helping improve water quality! 

This snapshot survey was a pilot for a larger survey WCT, DCVA, and Stroud Water Research Center are hoping to conduct in the spring. We are deeply grateful to the Upper Main Line YMCA for hosting this event and to our fantastic volunteers who were willing and eager to explore new sections of stream to collect this data. The snapshot survey would not have been possible without our partnerships with DCVA and Stroud Water Research Center. If you are interested in joining our community science program, please contact Lauren McGrath at lbm@wctrust.org. 

Market in the Meadow Vegetarian Chili Recipe

By

This recipe comes from What’s Gaby Cooking.

You all loved our Vegetarian Chili from Market in the Meadow, so we had to share!

A special thanks to our dedicated volunteers who harvested, chopped, and cooked this delicious meal at the Rushton Conservation Center. Most of the ingredients came right from Rushton Farm.

INGREDIENTS

  • 1 tablespoon olive oil, plus 2 extra teaspoons
  • 1 large sweet potato, peeled and diced
  • 1 large red onion, diced
  • 4 cloves garlic, roughly chopped
  • 2 tablespoons chili powder
  • 1/2 teaspoon ground chipotle pepper
  • 1/2 teaspoon ground cumin
  • 1/4 teaspoon kosher salt
  • 3 1/2 cups vegetable stock
  • 1 15-ounce cans black beans, rinsed and drained
  • 1 14.5-ounce can fire roasted diced tomatoes
  • 1/2 cup dried quinoa
  • 4 teaspoons lime juice
  • serving suggestions: avocado, cilantro, crema, grated cheese

DIRECTIONS

  1. Heat a large heavy bottom pot with the oil over medium high heat.
  2. Add the sweet potato and onion and cook for about 5 minutes, until the onion is softened. Add the garlic, chili powder, chipotle, cumin, and salt and stir to combine.
  3. Add the stock, tomatoes, black beans, and quinoa and bring the mixture to a boil. Stir to incorporate.
  4. Cover the pot and reduce the heat to maintain a gentle simmer.
  5. Cook for 30-40 minutes until the quinoa is fully cooked and the sweet potatoes are soft.
  6. Add the lime juice and remove the pot from the heat. Season with salt as needed.
  7. Garnish with avocado, cilantro, crema, or cheese before serving.

Serves 4 people.

This recipe comes from What’s Gaby Cooking.

Fish Shocking

By

On Saturday, October 22, the Watershed Protection Program joined scientists from the Academy of Natural Sciences of Drexel University’s Fisheries Team (ANS) to survey for fish in Ridley Creek at Ashbridge Preserve. It was a beautiful Saturday morning — crisp, bright, and perfect for learning more about the wildlife that calls Ridley Creek home! This event provided a unique opportunity to get a fish’s eye view of stream health, and it would not have been possible without the wonderful support of the talented Fisheries Team members Dr. David Keller and Paul Overbeck.

The morning started with a primer on fish survey protocols. Paul walked volunteers through the mechanics of electrofishing, a sampling technique where a small electric current is passed through the water to stun fish just long enough to be scooped up in a net and placed in a bucket. The scientists headed into Ridley Creek and began to survey, and immediately there was action in the water! 

As stunned fish began to fill the buckets, they were brought to shore and placed in aquariums to be studied. Within a short period of time, over 10 species of fish, crustaceans, and amphibians were documented. The Fisheries scientists quickly began to identify the wildlife and share what the presence of these creatures means for the ecosystem of Ridley Creek and surrounding landscape. Once the fish were observed in the aquariums, they were all safely released back into Ridley Creek. 

Included in the fishes that were identified was the American eel (Anguilla rostrata), a fish that migrates thousands of miles in its lifetime. This fish breeds in the Sargasso sea and migrates to headwater ecosystems — like at Ashbridge Preserve — where they can live over 25 years before completing their migration. The presence of this incredible fish showcases the connectivity of Ridley Creek with no large barriers to stop their movement to and from the Atlantic Ocean. American eel populations are declining due to large dams that block their migration, contribute to habitat loss, and overfishing of young eels.

Another fascinating fish present in the stream is the cutlip minnow (Exoglossum maxillingua). These fish are easy to identify up close, with a specially adapted three lobed, lower lip. These fish prefer gravel and rocky bottomed streams and are unable to thrive in polluted waterways where fine sediment buries rocky habitat. 

Black nose dace (Rhinichthys atratulus) are one of the most visibly common fishes in the headwaters of Ridley Creek and were abundant in the sample collected by ANS scientists! These fish are small, with big fish growing to be less than 4 inches long, but they school in shallow clear waters and can often be seen from the stepping stones at Ashbridge Preserve.

Fallfish (Semotilus corporalis) is the largest minnow native to eastern North America and they are abundant in the Ridley Creek headwaters! They are excellent targets for anglers, and their energetic behavior has earned them the nickname “freshwater tarpon.”

Rock Bass (Ambloplites rupestris) is well known to anglers as a sport fish, but this fish is actually an introduced species in Pennsylvania waterways! Since being introduced some time in the 1880s, they are actively stocked in waterways throughout the state.  

In addition to the fish that were sampled from Ridley Creek, ANS brought preserved specimens of fish of interest, including the northern snakehead (Channa argus), an aggressive invasive fish that has been spreading throughout the Delaware River watershed. 

This exciting and fascinating experience highlighted the importance of the ways that our activities on the landscape impacts the many lifeforms that call Ridley Creek home. The presence or absence of different species of fish can inform researchers of the health of Ridley Creek. There is a clear relationship with the development of the landscape and the decreasing health of freshwater ecosystems resulting in the loss of indicator species. As species disappear from the ecosystem, the entire system becomes weaker. As we head into a future that includes more frequent large storms, it is important that we focus on understanding how we can strengthen and improve the health of our systems to create resilience — the first step in this process is looking at who is present in the ecosystem. 

A huge thanks to the Fisheries Team for sharing their immense knowledge and skill! Click here to learn more about ongoing Fisheries research!

For more information on the research being conducted by the Watershed Protection Program and the lessons we have been learning about water quality in Ridley, Crum, and Darby Creeks, please explore the State of Our Streams Report.

— By Watershed Protection Program Director Lauren McGrath

A Rushton Nature Keeper “Graduate” Restores Historic Bluebird Trail to Willistown

By

By Education Programs Manager Blake Goll

Photos by Blake Goll

Almost ten years ago, a little girl named Siana Christaldi and her brother began religiously attending the Trust’s nature programs that were then part of the nascent Junior Birding Club. Siana especially loved the adventures in which she and her family enthusiastically participated: watching the dazzling courtship flights of the American Woodcocks at Rushton Farm in early spring, exploring a local vernal pool for spotted salamanders one rainy night in early April with Education Programs Manager Blake Goll, and even lending an eager hand for local stream cleanups at the Trust’s nature preserves.

Siana’s passion for nature flourished over the years as she continued to participate in Rushton Nature Keepers program that was established in 2018 as the Trust’s holistic approach to environmental education, encompassing major conservation themes of healthy habitat, birds and wildlife, watersheds, and regenerative farming. In 2019, Siana and her family also dove wholeheartedly into the Trust’s Homeowner Bird Box Program—receiving their own bluebird box to monitor in their yard. A bluebird family quickly took up residence, and Siana was hooked. Naming the dad Blueberry and the mom Muffin, she bravely inspected the nest regularly despite having her hair tousled by the chastising dives of the parents.

Siana and her brother Daniel at a Rushton Nature Keeper program in 2018

It was this personal connection to the bluebird box in her backyard that inspired her to build bluebird boxes for her Girl Scout Silver Award project last winter. Siana (now 14 years old) first met with local bluebird box builder, Ken Leister, better known as The Bluebird Keeper; he has built close to 1,000 boxes in the past ten years for homes, schools, golf courses, local businesses, and nonprofits like Willistown Conservation Trust. And his boxes are crème de la crème if you are a bluebird; they are equipped with thoughtful features that many commercial boxes lack, such as an extra-large roof and ample ventilation to help prevent the chicks from overheating during hot summer days.

After collecting free scrap wood from a local fencing company, Siana worked with Ken to learn the dimensions and to cut all the parts for ten bluebird boxes. She took these parts back to her building team of two friends and instructed them on how to assemble a “Ken Leister bluebird box.” Siana reflects, “We all had fun learning and building these boxes, and the whole experience felt like a special gift during the Covid-19 quarantine.”

In early spring, Siana worked with Blake to install the ten boxes at a private property in Willistown. This was significant because the farm’s current owner is keen on reestablishing the bluebird box trail that her grandfather, Hardie Scott, had lovingly established in the 60’s. In those days, concern was growing over the declining bluebird populations; threats included non-native competing species like House Sparrows, widespread pesticide use, and habitat loss from development. With the help of compassionate citizens establishing nest box campaigns and well monitored bluebird trails beginning in the 60’s and 70’s, Pennsylvania is once again home to healthy populations of these stunning backyard birds.

Siana helped monitor the bluebird trail this summer with Blake and found that the boxes were also being enjoyed by Tree Swallows, native birds that hunt insects on the wing. Since bluebirds hunt insects by diving into the grass from a hunting perch, they are not a direct competitive threat to Tree Swallows. Consequently, a swallow will generally allow a nearby bird box to be occupied by bluebirds but not by other swallows. As such, the boxes were cleverly paired at a private farm in Willistown to hopefully allow Eastern Bluebirds and Tree Swallows to live and breed harmoniously.

The new bluebird trail now lies vacant under the crisp autumn sunshine in the wide-open rolling hills, wild meadows, and fields of Willistown. The boxes hold the promise of many more broods of baby birds in the spring to come. When the Tree Swallows return to somersault through the honeysuckle-scented air and the bluebirds’ sweet songs bubble forth from the new leaves, Siana’s boxes will again come to life.

  • Siana and her brother Daniel monitoring the bluebird trail this summer. BHG
  • Tree Swallow nest lined with goose feathers

Blake Goll | she/her | Education Programs Manager | Blake plays a big role in the Trust’s Bird Conservation Program, as well as the outreach and educational initiatives as the coordinator for the Rushton Nature Keepers program.

Volunteer Spotlight: Eagle Scout Will Hetzel Leads Troop 106 in Building Bog Bridges at Ashbridge Preserve

By

By Director of Stewardship Andrew Kirkpatrick

Photos by Director of Land Protection Erik Hetzel

It has been over five years since I began working in the nonprofit sector, and during that time I have learned a universal truth about our work; volunteers are the backbone of our operations. People who choose to give their time to support our mission are critical to our success. Across all of our program areas, we could not achieve our mission without our volunteers.

Boy Scout Troop 106 with Andrew Kirkpatrick and Erik Hetzel

When it comes to our Habitat Restoration Program, managing and maintaining our nature preserves in Willistown — Rushton, Kirkwood, and Ashbridge — would not be possible without the help of our volunteers. Keeping trails clear and invasive species in check is a full-time operation. Our preserve manager Mike Cranney has his hands full, but with the help of our incredible volunteers, he can accomplish a lot. Local Eagle Scout, Will Hetzel (son of our Director of Land Protection, Erik Hetzel) recently demonstrated this in August when he organized scouts from Troop 106 to install eight new bog bridges at Ashbridge Preserve.

We use bog bridges at our preserves to allow visitors to traverse wet and mucky areas without causing damage to the trail. The bog bridges, also called puncheons, are constructed with wood planks on top of footers and covered with chicken wire to reduce slippery conditions when it rains. The bog bridges are anchored to the ground using rebar stakes. For his project, Will raised over $1,000 in donations and goods to build the new bog bridges for the path adjacent to Ridley Creek.

On a hot and sunny Wednesday afternoon, Will gathered his team of scouts to build the bridges on site and install them along the trail. Will and the scouts were well organized, efficient, and professional. I felt inspired watching these fine young men work together in the preserve, getting their hands dirty and creating an amenity that will benefit the community. The scouts did a great job and completed the project from start to finish in three hours. Thanks to them, this trail, which is often wet and muddy, will now be more easily accessible to our visitors.

Having been a scout myself, I can say what an accomplishment it is for Will to reach the rank of Eagle Scout and complete his service project. Not many scouts stick it out and commit to this level of accomplishment. It is a reflection of Will’s perseverance, fortitude, and determination that will serve him well throughout his academic and future professional career. I think we can all draw inspiration from the example set by Will and the scouts from Troop 106. Taking the time to give back by volunteering is both personally fulfilling and incredibly impactful for organizations like ours.

If you are interested in joining our group of dedicated volunteers, you are welcome to join us at our Stewardship Volunteer Thursdays, held at our various Preserves from 9am to 4pm every Thursday through November. You can come for the whole session or as long as you’re able! Send an email to Preserve Manager Mike Cranney (mjc@wctrust.org) to sign up. If you’d like to complete a larger project, similar to Will’s bog bridges, please get in touch with Stewardship Director Andrew Kirkpatrick (ajk@wctrust.org).


By Andrew J. Kirkpatrick | he/him | Director of Stewardship | As part of the Trust’s Habitat Restoration Program, Andrew oversees the stewardship of our private conservation easement properties and our nature preserves, in addition to coordinating our Stewardship volunteers days.

OUR NATURE PRESERVES

Our nature preserves are open to the public 365 days per year from sunrise to sunset, providing natural places that offer peace and respite for all. Willistown Conservation Trust owns and manages three nature preserves in the Willistown area - Ashbridge, Kirkwood and Rushton Woods Preserve. We maintain these lands for the … Learn more about our nature preserves.

Upcoming Events

No event found!
Load More

DONATE TODAY!

Invest in Nature! ENGAGE CONNECT SPONSOR LEAVE A LEGACY   If you would like to make a gift of securities, such as stocks, bonds, or mutual fund shares, please contact us at 610-353-2562 for instructions. For more … Donate Today

WHERE WE WORK

The work of the Willistown Conservation Trust is concentrated on 28,000 acres of Willistown Township … read more