NDLI: Salinization alters ecosystem structure in urban stormwater detention ponds

Content Provider	Springer Nature Link
Author	Meter, Robin J. Swan, Christopher M. Sdgrass, Joel W.
Copyright Year	2011
Abstract	Stormwater ponds now comprise a significant portion of standing water in urban areas. These ponds act to sequester excess run-off and pollutants, such as road salt deicers. While these man-made ponds are not intended to serve as freshwater ecosystems, it is becoming clear that they do provide habitat for many organisms, but we know little of their ecosystem structure, function and interactions with pollutants. From April through June 2009, we surveyed 8 stormwater ponds in the Red Run Watershed, Baltimore County, Maryland, USA to describe patterns in aquatic food webs associated with a gradient in road salt inputs. Periphyton, phytoplankton and zooplankton samples were collected from each pond every 4–6 weeks. Specific conductance, a measure of chloride salt loading, among the 8 ponds varied widely throughout the survey, ranging from 99 μS cm$^{−1}$ to 19,320 μS cm$^{−1}$. Low (average = 404 +/− 82.6 (SE) μS cm$^{−1}$) and medium (average = 1749 +/− 267 (SE) μS cm$^{−1}$) conductance ponds had lower algal biomass and higher densities of zooplankton taxa relative to high (average = 7231 +/− 2143 (SE) μS cm$^{−1}$) conductance ponds, which were largely devoid of all zooplankton through the end of May. The observed decline in zooplankton density along an increasing chloride gradient is consistent with experimental results of road deicer effects, suggesting algal resources are possibly freed from grazing pressure as zooplankton consumers are negatively impacted by road salt exposure. Our results highlight the potential for both direct and indirect effects of road deicers on freshwater communities.
Starting Page	723
Ending Page	736
Page Count	14
File Format	PDF
ISSN	10838155
Journal	Urban Ecosystems
Volume Number	14
Issue Number	4
e-ISSN	15731642
Language	English
Publisher	Springer US
Publisher Date	2011-05-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Periphyton Phytoplankton Road salt Zooplankton Environmental Management Ecology Nature Conservation Urban Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Urban Studies

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