{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,5]],"date-time":"2025-11-05T10:59:00Z","timestamp":1762340340849},"reference-count":53,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2010,9,1]],"date-time":"2010-09-01T00:00:00Z","timestamp":1283299200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Ecological Applications"],"published-print":{"date-parts":[[2010,9]]},"abstract":"<jats:p>River valleys represent biologically rich corridors characterized by natural disturbances that create moist and barren sites suitable for colonization by native riparian plants, and also by weeds. Dams and reservoirs interrupt the longitudinal corridors and we hypothesized that this could restrict downstream weed expansion. To consider this \u201creservoir impediment\u201d hypothesis we assessed the occurrences and abundances of weeds along a 315\u2010km river valley corridor that commenced with an unimpounded reach of the Snake River and extended through Brownlee, Oxbow, and Hells Canyon reservoirs and dams, and downstream along the Snake River. Sampling along 206 belt transects with 3610 quadrats revealed 16 noxious and four invasive weed species. Ten weeds were upland plants, with Canada thistle (<jats:named-content content-type=\"genus-species\">Cirsium arvense<\/jats:named-content>) restricted to the upstream reaches, where field morning glory (<jats:named-content content-type=\"genus-species\">Convolvulus arvensis<\/jats:named-content>) was also more common. In contrast, St. John's wort (<jats:named-content content-type=\"genus-species\">Hypericum perforatum<\/jats:named-content>) was more abundant below the dams, and medusahead wildrye (<jats:italic>Taeniatherum caput\u2010medusae<\/jats:italic>) occurred primarily along the reservoirs. All seven riparian species were abundant in the upstream zones but sparse or absent below the dams. This pattern was observed for the facultative riparian species, poison hemlock (<jats:named-content content-type=\"genus-species\">Conium maculatum<\/jats:named-content>) and perennial pepperweed (<jats:named-content content-type=\"genus-species\">Lepidium latifolium<\/jats:named-content>), the obligate riparian, yellow nut sedge (<jats:named-content content-type=\"genus-species\">Cyperus esculentus<\/jats:named-content>), the invasive perennial, reed canary grass (<jats:named-content content-type=\"genus-species\">Phalaris arundinacea<\/jats:named-content>), and three invasive riparian trees, Russian olive (<jats:named-content content-type=\"genus-species\">Elaeagnus angustifolia<\/jats:named-content>), false indigo (<jats:named-content content-type=\"genus-species\">Amorpha fruticosa<\/jats:named-content>), and tamarisk (<jats:named-content content-type=\"genus-species\">Tamarix<\/jats:named-content> spp.). The hydrophyte purple loosestrife (<jats:named-content content-type=\"genus-species\">Lythrum salicaria<\/jats:named-content>) was also restricted to the upstream zone. These longitudinal patterns indicate that the reservoirs have impeded the downstream expansion of riparian weeds, and this may especially result from the repetitive draw\u2010down and refilling of Brownlee Reservoir that imposes a lethal combination of drought and flood stress. The dams and reservoirs may also interrupt hydrochory, the downstream flow of seeds and clonal fragments. We thus conclude that with some operational patterns, dams and reservoirs can impede the downstream expansion of riparian weeds.<\/jats:p>","DOI":"10.1890\/09-0063.1","type":"journal-article","created":{"date-parts":[[2010,6,22]],"date-time":"2010-06-22T04:32:24Z","timestamp":1277181144000},"page":"1664-1677","source":"Crossref","is-referenced-by-count":32,"title":["Favorable fragmentation: river reservoirs can impede downstream expansion of riparian weeds"],"prefix":"10.1002","volume":"20","author":[{"given":"Stewart B.","family":"Rood","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeffrey H.","family":"Braatne","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lori A.","family":"Goater","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2010,9]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1099-1646(200001\/02)16:1<83::AID-RRR567>3.0.CO;2-T"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.2307\/1941956"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00267-007-9048-4"},{"key":"e_1_2_6_5_1","volume-title":"Ecology of riparian vegetation of the Hells Canyon corridor of the Snake River: field data, analysis and modeling of plant responses to inundation and regulated flows. 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