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Distinctive connectivities of near-stream and watershed-wide land uses differentially degrade rural aquatic ecosystems

Author(s):

C Rhett Jackson
Kristen Cecala
Seth Wenger
Joseph Kirsch
Jackson Webster
David Leigh
Jennifer Sanders
Jason Love
Jennifer Fraterrigo
Amy D. Rosemond

Year:

2021

Publication type:

Scientific Journal (JRNL)

Primary Station(s):

Southern Research Station

Source:

BioScience

Description

The water-quality effects of low-density rural land-use activities are understudied but important because of large rural land coverage. We review and synthesize spatially extensive studies of oligotrophic mountain streams in the rural Southern Appalachian Mountains, concluding that rural land-use activities significantly degrade water quality through altered and mostly enhanced landscape–stream connections, despite high forest retention. Some connections (insolation, organic inputs, root–channel interactions, stream–field connectivity, individual landowner discharges) are controlled by near-stream land-use activities, whereas others (reduced nitrogen uptake and cycling, enhanced biological nitrogen fixation, nutrient subsidy, runoff from compacted soils, road runoff delivery) are controlled by basin-wide land use. These connections merge to alter basal resources and shift fish, salamander, and invertebrate assemblages toward species tolerant of higher turbidity and summer temperatures and those more competitive in mesotrophic systems. Rural water quality problems could be mitigated substantially with well-known best management practices, raising socioecological governance questions about best management practice adoption.

Citation

Jackson, C Rhett; Cecala, Kristen K; Wenger, Seth J; Kirsch, Joseph E; Webster, Jackson R; Leigh, David S; Sanders, Jennifer M; Love, Jason P; Knoepp, Jennifer D; Fraterrigo, Jennifer M; Rosemond, Amy D. 2021. Distinctive connectivities of near-stream and watershed-wide land uses differentially degrade rural aquatic ecosystems. BioScience. 72(2): 144-159. https://doi.org/10.1093/biosci/biab098.

Cited

Publication Notes

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https://www.fs.usda.gov/treesearch/pubs/64473