Establishment of terrestrial mammals on former reservoir beds following large dam removal on the Elwha River, Washington, USA DOI Creative Commons
Rebecca McCaffery,

Sara Cendejas-Zarelli,

Katy R. Goodwin

et al.

Frontiers in Ecology and Evolution, Journal Year: 2024, Volume and Issue: 12

Published: March 26, 2024

Terrestrial wildlife species are important yet often overlooked taxa in the recovery of ecosystems following dam removal. Their presence can shape ecosystem recovery, signal restoration function, and influence food web dynamics nutrient transfer. We used camera traps to examine seasonal use two former reservoir beds an upstream reference reach by mammalian community removal large dams on Elwha River, Washington, USA. For certain taxa, we compared current data collected prior Camera revealed at least fifteen mammal species, including but not limited American black bear ( Ursus americanus ), Columbian black-tailed deer Odocoileus hemionus columbianus Roosevelt elk Cervus elaphus roosevelti puma Puma concolor coyotes Canis latrans bobcats Lynx rufus snowshoe hares Lepus ). Coyotes were found mostly lower watershed outside Olympic National Park boundary, while other distributed throughout area. did see major differences composition between areas reach, though number detections across study reaches differed for most species. Unlike previous findings, bears observed all seasons this study, suggesting a shift since Full terrestrial could take decades unfold, early patterns demonstrate rapid establishment new riparian surfaces that expected continue evolve with fish vegetation communities.

Language: Английский

Environmental effects of the Kakhovka Dam destruction by warfare in Ukraine DOI
Oleksandra Shumilova, Alexander Sukhodolov,

Natalia Osadcha

et al.

Science, Journal Year: 2025, Volume and Issue: 387(6739), P. 1181 - 1186

Published: March 13, 2025

The use of water as a weapon in highly industrialized areas the Russo-Ukrainian war has resulted catastrophic economic and environmental damages. We analyze effects caused by military destruction Kakhovka Dam. link field, remote sensing, modeling data to demarcate disaster’s spatial-temporal scales outline trends reestablishment damaged ecosystems. Although media attention focused on immediate impacts flooding society, politics, economy, our results show that toxic contamination within newly exposed sediments former reservoir bed poses largely overlooked long-term threat freshwater, estuarine, marine continued may lead even greater risks for people environment.

Language: Английский

Citations

1
Riverine Barrier Removals Could Proliferate Biological Invasions DOI Open Access

Ellen J. Dolan,

Ismael Soto, Jaimie T. A. Dick

et al.

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(3)

Published: March 1, 2025

Multiple stressors, such as pollution, climate change, invasive species and fragmentation, threaten global ecosystems, requiring holistic management actions. Freshwater ecosystems are disproportionately biodiverse particularly impacted by fragmentation biological invasions. Artificial barriers, dams weirs, long-standing features of landscapes, with a divergence views on their benefits disbenefits. Recognition the negative impacts barriers river continuum native biota, for migratory aquatic species, has led to rapid rate barrier removals in recent decades, especially North America Europe. However, since rise riverine construction centuries ago, invasion rates have concurrently surged. can paradoxically slow spread through freshwaters, removal efforts thus risk proliferating that disperse rapidly connected habitats. Despite well-intended plans restoration removals, subsequent colonisation been largely overlooked. This presents 'connectivity conundrum': intuitively addresses issues migrations dispersals, but could perversely exacerbate species. Basin-scale data collection around short- long-term will help underpin future projects maximise potential beneficial outcomes

Language: Английский

Citations

0
Legacy sediment: A conceptual model and perspective on the role of dams DOI Creative Commons

Bridget Livers,

Noah P. Snyder

Earth Surface Processes and Landforms, Journal Year: 2025, Volume and Issue: 50(4)

Published: March 18, 2025

Abstract The term ‘legacy’ usually refers to past human activities that have long since ceased, but contemporary can potentially leave future legacies. While legacy sediment is often defined as having upstream anthropogenic origins, such from land clearing, infrastructure flood control structures and dams trap sediment, whether naturally or anthropogenically derived, persist for centuries more, thus leaving a of sedimentation. Dam removal becoming more common, accounting caused by the impoundment an important component planning its impacts. We provide four examples explore mechanisms generation: (1) use changes with no dams, (2) review non‐dam abstracts water substantially reduces transport, (3) case study longest‐duration geomorphic monitoring (2007 2023) short (<10 m) dam removed in 2008 (4) well‐studied tall (>10 removal. When are removed, fluvial processes typically erode directly adjacent newly formed opened stream channels over timescales, inaccessible deposits remain sediment. demonstrate overbank flooding sedimentation run‐of‐river create unrecognised outside modern reservoir pool. further outline how certain other characteristics, style character generate persistent sometimes landforms active where it unlikely be excavated natural except most extreme events. With increase building various parts world, ubiquitous, consequences river management.

Language: Английский

Citations

0
Introduction DOI
Sk Asraful Alam,

Ramkrishna Maiti

Earth and environmental sciences library, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 18

Published: Jan. 1, 2025

Citations

0
Size‐dependent effects of dams on river ecosystems and implications for dam removal outcomes DOI Creative Commons
Rebecca L. Brown, Donald F. Charles,

Richard J. Horwitz

et al.

Ecological Applications, Journal Year: 2024, Volume and Issue: 34(6)

Published: Aug. 13, 2024

Understanding the relationship between a dam's size and its ecological effects is important for prioritization of river restoration efforts based on dam removal. Although much known about large storage dams, this information may not be applicable to small which represent vast majority dams being considered To better understand how vary with size, we conducted multidisciplinary study downstream effect range characteristics including geomorphology, water chemistry, periphyton, riparian vegetation, benthic macroinvertebrates, fish. We related variables downstream-upstream fractional difference in measured 16 mid-Atlantic region ranging from 0.9 57 m high, hydraulic residence times (HRTs) 30 min 1.5 years. For physical attributes, larger had effects. example, surface width below was greater dams. By contrast, there no sediment grain though fraction fine-grained bed material lower independently size. Larger tended reduce quality more, decreased dissolved oxygen increased temperature. inorganic nutrients (N, P, Si), but particulate P) reaches. Aquatic organisms have dissimilarity species composition (for fish periphyton), taxonomic diversity macroinvertebrates), pollution tolerance periphyton macroinvertebrates). Plants responded differently fewer invasive more Overall, these results demonstrate that impact ecosystem components measured, hence their removal has greatest potential restoring ecosystems.

Language: Английский

Citations

3
Establishment of terrestrial mammals on former reservoir beds following large dam removal on the Elwha River, Washington, USA DOI Creative Commons
Rebecca McCaffery,

Sara Cendejas-Zarelli,

Katy R. Goodwin

et al.

Frontiers in Ecology and Evolution, Journal Year: 2024, Volume and Issue: 12

Published: March 26, 2024

Terrestrial wildlife species are important yet often overlooked taxa in the recovery of ecosystems following dam removal. Their presence can shape ecosystem recovery, signal restoration function, and influence food web dynamics nutrient transfer. We used camera traps to examine seasonal use two former reservoir beds an upstream reference reach by mammalian community removal large dams on Elwha River, Washington, USA. For certain taxa, we compared current data collected prior Camera revealed at least fifteen mammal species, including but not limited American black bear ( Ursus americanus ), Columbian black-tailed deer Odocoileus hemionus columbianus Roosevelt elk Cervus elaphus roosevelti puma Puma concolor coyotes Canis latrans bobcats Lynx rufus snowshoe hares Lepus ). Coyotes were found mostly lower watershed outside Olympic National Park boundary, while other distributed throughout area. did see major differences composition between areas reach, though number detections across study reaches differed for most species. Unlike previous findings, bears observed all seasons this study, suggesting a shift since Full terrestrial could take decades unfold, early patterns demonstrate rapid establishment new riparian surfaces that expected continue evolve with fish vegetation communities.

Language: Английский

Citations

0