[APWG] the economic cost of stormwater damage caused by invasive species

Tue Jan 10 19:39:06 CST 2017

I participated in a conference call on invasive species with one item on the
agenda to update the economic impact of invasive species. There are many
kinds of economic impact besides the cost of removing invasives. For
example, the economic cost of stormwater damage caused by invasive species.
Many studies have shown that Japanese Stiltgrass doubles the amount of
nitrogen and storm water released into the Chesapeake Bay. The primary
reason is that the tiny root system replaces the complex root system with a
variety of niches that are necessary to hold water and release it slowly.
This argument could be used in general for other non-native invasive species
replacing a complex of many native species with different root systems of
different depths etc. In our region the surface of Japanese Stiltgrass has
expanded typically to now cover over 20% of the habitat. 

Does anyone have a cost update for the economic cost of stormwater damage
caused by invasive species. Thanks.

Marc

Conservation biologist, Park Ranger Office, Non-native Invasive Plant
Control coordinator. 
(301) 442-5657 cell,  <mailto:ialm at erols.com> ialm at erols.com
Natural and Historical Resources Division
The Maryland-National Capital Park and Planning Commission
 <http://www.pgparks.com/> www.pgparks.com 

-----Original Message-----

From: Marc Imlay

To:  <mailto:RNORTHROP at dnr.state.md.us> RNORTHROP at dnr.state.md.us

Cc: Steve McKindley-Ward

Sent: 6/3/2002 11:21 PM

Subject: RE: Siltgrass and hydrology

Hi Rob

Joan Ehrenfeld, et al. Changes in Soil Functions Following Invasions of
Exotic Understory Plants in Deciduous Forests. Ecological Applications
11(5), 2001, pp. 1287-1300 (Ecological Society of America)

P. S. Kourtev, et al.  Differences in Earthworm Densities and Nitrogen
Dynamics in soils under Exotic and Native Plant Species. Biological
Invasions 1: 237-245, 1999

Some findings I noted in the papers:

pH elevated from 4.5-4.8 (Vaccinium) to 5.5-6.5 (stilt grass) in two parks
in New Jersey. Nitrification rates and Extractable NO3 were also much higher
with Microstegium. Very low root biomass, loss of organic soil horizon and
great increase in (European) earthworms.

(increased from 30-280 worms/m2). Litter was reduced by two thirds.

Marc

-----Original Message-----

From:  <mailto:RNORTHROP at dnr.state.md.us> RNORTHROP at dnr.state.md.us [
<mailto:RNORTHROP at dnr.state.md.us> mailto:RNORTHROP at dnr.state.md.us]

Sent: Friday, May 31, 2002 4:07 PM

To:  <mailto:ialm at erols.com> ialm at erols.com

Subject: Siltgrass and hydrology

Hi Marc,

     Could you send me the citation(s) for the publication(s) on the role of
siltgrass in eastern US hydrology?

     There was a fellow at the MCC talk that wanted the citation for the
Borman and Likens study at Hubbard Brook concerning forest biomass
development. Do you remember who that was? He never gave me his name and I
wanted to pass along the information.

     Thanks for your help and consideration. I look forward to hearing from
you.

Rob Northrop

DNR Forest Service

130 McKinneytown Road

North East, MD  21901

410-287-2918

Marc Imlay, PhD 
Chair of the Biodiversity and Habitat Stewardship Committee for the Maryland
Chapter of the Sierra Club.

Marc Imlay, PhD, Chair, MAIPC Biological control working Group Conservation
biologist, 

Park Ranger Office, Non-native Invasive Plant Control coordinator.
<mailto:Marc.Imlay at pgparks.com> Marc.Imlay at pgparks.com

(301) 442-5657 cell  Natural and Historical Resources Division

The  Maryland-National   Capital   Park  and Planning Commission

  _____  

From: Rogner, David [mailto:drogner at howardcountymd.gov] 
Sent: Friday, October 10, 2014 12:23 PM
To: ialm at erols.com <mailto:ialm at erols.com> 
Cc: Farfaras, Cheryl
Subject: Question about Invasives and Hydrology

Hi Marc,

         I am writing you with a question about whether there are studies
that show how removing invasive plants in the understory correlates to
positive effects on water quality or macroinvertabrate habitat in streams.
You seem like the guy who could point me in that direction. We are hoping to
write a grant here at the middle patuxent environmental area to remove about
3 acres of invasive autumn olive, multiflora rose, barberry, amur
honeysuckle, bittersweet and do native replantings. But it's a grant that
should relate to positive effects on water quality somehow. Please let me
know if you have any ideas on how I could describe this for the grant due
October 31st. 

        Many Thanks,

        Davey Rogner 

        301-523-2879

       Invasive Species Project Manager

        Middle Patuxent Environmental Area 

From: Laurie Taylor Mitchell [mailto:ltmitchell4 at comcast.net] 
Sent: Tuesday, October 11, 2016 6:47 PM
To: ialm at erols.com <mailto:ialm at erols.com> 
Subject: your e-mail on Green is Good

Hi Marc,

There is still time to show people the vast unfolding disaster of Japanese
Stiltgrass around the Loch Raven Reservoir this season before it all goes
yellow - actually right now it is peaking or just beyond the peak growth.

You are absolutely right, there is no substitute for seeing a huge area in
person!  Getting them on a site is crucial.

If a relationship through research could ever be demonstrated between
invasives taking over the reservoir and a degradation of the water supply
for over a million people, that would be great.  That's the only thing that
is going to work as far as I can tell.  If I've already asked you about
this, please forgive me - and could you send it again?

Thanks,

Laurie

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