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URBAN NATURALIST

by bernard browntphotos by christian hunold

Over Eager Newly returned beavers deal setbacks to local tree-planting efforts

T

he natural is often artificial in a city. It can take a lot of planning and work to get native species growing along the battered Tacony Creek, to keep the water unpolluted and the bed from getting scoured by runoff each time it rains. Thus it can be especially frustrating when a native animal foils your plans. “They took out a strip of 50 trees near Rising Sun,” recounts Denis Mora, Philadelphia Water Department Water Conveyance Supervisor, with amazement. He is talking about beavers. Tom Witmer, Natural Lands Restoration Operations Manager with Philadelphia Parks and Recreation, had told me a similar story about another tree-planting along the creek, this one closer to Adams Avenue. “We like trees and planting trees everywhere because they manage stormwater, and trees in the park are no different,” explains Alix Howard, Director of Education and Outreach for the Tookany/Tacony-Frankford Watershed Partnership (TTF). The beavers don’t care. They just need food and building supplies, and planting a row of saplings is like giving them a combination buffet and hardware store. They fell the trees to munch the smaller branches and leaves, and use the wood 38

GR IDPH I L LY.CO M

DEC E M BE R 2013

The Tacony Creek, along with (clockwise from right) evidence of trees damaged by beavers, and (left) one of the culprits.

for their underwater construction projects. These Tacony beavers are newcomers. According to the Pennsylvania Game Commission, by the early 1900s, trapping had extirpated beavers — rendered them locally extinct — across the commonwealth. The Commission released Wisconsin and Canadian beavers starting in 1917, and in a few decades beavers were spreading across the state on their own. A Fairmount Park inventory notes that there were no beavers in Philadelphia’s waterways as of 1903, and that as of 1999 they were living in the Delaware and Schuylkill. They only started appearing in Northeast Philly’s creeks (the Tacony and the Pennypack) in 2008, according to Mora. We’re used to seeing beavers in wilder areas, so photographer Christian Hunold and I immediately recognized the rough-chewed, pointy stumps we saw along the path. These were a couple years old, but the busy rodents will keep

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