Cited by 3,645Fish Ecology and Management StudiesFreshwater macroinvertebrate diversity and ecologyAquatic Ecosystems and Biodiversity

Emerging threats and persistent conservation challenges for freshwater biodiversity

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Reid, Andrea J., Carlson, Andrew K., Creed, Irena F., Eliason, Erika J., Gell, Peter A., Johnson, Pieter T. J., Kidd, Karen A., MacCormack, Tyson J. +8 more·2019·Biological Reviews

Abstract

In the 12 years since Dudgeon et al . (2006) reviewed major pressures on freshwater ecosystems, the biodiversity crisis in the world's lakes, reservoirs, rivers, streams and wetlands has deepened. While lakes, reservoirs and rivers cover only 2.3% of the Earth's surface, these ecosystems host at least 9.5% of the Earth's described animal species. Furthermore, using the World Wide Fund for Nature's Living Planet Index, freshwater population declines (83% between 1970 and 2014) continue to outpace contemporaneous declines in marine or terrestrial systems. The Anthropocene has brought multiple new and varied threats that disproportionately impact freshwater systems. We document 12 emerging threats to freshwater biodiversity that are either entirely new since 2006 or have since intensified: ( i ) changing climates; ( ii ) e‐commerce and invasions; ( iii ) infectious diseases; ( iv ) harmful algal blooms; ( v ) expanding hydropower; ( vi ) emerging contaminants; ( vii ) engineered nanomaterials; ( viii ) microplastic pollution; (i x ) light and noise; ( x ) freshwater salinisation; ( xi ) declining calcium; and ( xii ) cumulative stressors. Effects are evidenced for amphibians, fishes, invertebrates, microbes, plants, turtles and waterbirds, with potential for ecosystem‐level changes through bottom‐up and top‐down processes. In our highly uncertain future, the net effects of these threats raise serious concerns for freshwater ecosystems. However, we also highlight opportunities for conservation gains as a result of novel management tools (e.g. environmental flows, environmental DNA) and specific conservation‐oriented actions (e.g. dam removal, habitat protection policies, managed relocation of species) that have been met with varying levels of success. Moving forward, we advocate hybrid approaches that manage fresh waters as crucial ecosystems for human life support as well as essential hotspots of biodiversity and ecological function. Efforts to reverse global trends in freshwater degradation now depend on bridging an immense gap between the aspirations of conservation biologists and the accelerating rate of species endangerment.

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  • The Biloxi Marsh project focuses on restoration and minimizing shoreline retreat to help protect the Wildlife Management Area and dissipate hurricane surges and waves threatening New Orleans' newly rebuilt hurricane flood defences.

    “The Biloxi Marsh project focuses on restoration and minimizing shoreline retreat to help protect the Wildlife Management Area and dissipate hurricane surges and waves threatening the New Orleans' newly rebuilt hurricane flood defences.158”

    From Protecting and restoring habitats to benefit freshwater biodiversity (2024) · cites this paper as [158]

    The passage on coastal salinisation (section “Light and noise”; page unavailable) mentions hurricanes and storm surges, but not the Biloxi Marsh project. Searches for Biloxi Marsh, shoreline retreat, the Wildlife Management Area, and New Orleans flood defences found no passage addressing the project's aims. (LLM, conf=0.75)

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  • Among vertebrates, those living in fresh water-fishes and amphibians-face the greatest threat.

    “freshwater vertebrates (fishes and amphibians) are the most threatened group of vertebrates (Reid et al. 2019).”

    From Scientists’ warning to humanity on the freshwater biodiversity crisis (2021) · cites this paper as Reid et al. 2019

  • Per unit habitat volume, fresh waters are among Earth's most diverse systems: over 140,000 species-about 12% of described species-occupy roughly 2% of land surface and 0.007% of planetary water.

    “Freshwater ecosystems are also among the most diverse per unit habitat volume on Earth, with more than 140 000 species (i.e., fungi, plants, invertebrates, and vertebrates; c. 12% of all described species) compressed into just * 2% of the world's surface area, and a minute * 0.007% of the total planetary water supply (Reid et al. 2019).”

    From Scientists’ warning to humanity on the freshwater biodiversity crisis (2021) · cites this paper as Reid et al. 2019

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Research works printed but not linked: 3

  1. Hoffman, G. L. (1990). Myxobolus cerebralis, a worldwide cause of salmonid whirling disease. Journal of Aquatic Animal Health 2, 30-37.
  2. Taylor, W. W., Bartley, D. M., Goddard, C. I., Leonard, N. J. & Welcomme, R. (2016). Freshwater, Fish and the Future: Proceedings of a Global Conference on Inland Fisheries. FAO, Rome.
  3. UNEP (2017). Volume 2: Technical Guide for Classification and Target-Setting. In A Framework for Freshwater Ecosystem Management (ed STRATEGIC AGENDA), pp. 1-64. Nairobi.

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Authors
Reid, A. J., Carlson, A. K., Creed, I. F., Eliason, E. J., Gell, P. A., Johnson, P. T. J., Kidd, K. A., MacCormack, T. J., Olden, J. D., Ormerod, S. J., Smol, J. P., Taylor, W. W., Tockner, K., Vermaire, J. C., Dudgeon, D., & Cooke, S. J.
Affiliations
  • Carleton University (CA)
  • Michigan State University (US)
  • University of Saskatchewan (CA)
  • University of California, Santa Barbara (US)
  • Federation University (AU)
  • University of Colorado Boulder (US)
  • McMaster University (CA)
  • Mount Allison University (CA)
  • University of Washington (US)
  • Cardiff University (GB)
  • Queen's University (CA)
  • Leibniz Institute of Freshwater Ecology and Inland Fisheries (DE)
  • University of Hong Kong (HK)
Corresponding author
Reid, Andrea J.
Venue
Biological Reviews
Publisher
Wiley
Published
2018-11-22
Volume
94
Issue
3
Pages
849-873
ISSN
  • 0006-3231 (ISSN-L)
  • 1464-7931
  • 1469-185X
OpenAlex
W2901199346
Cited by
3,645
References
305
Citations by year
2026: 564 · 2025: 670 · 2024: 617 · 2023: 523 · 2022: 523 · 2021: 406 · 2020: 259 · 2019: 81 · 2018: 1
FWCI
16.29
Type
journal article
Language
en
Open access
Locations
  • Biological reviews/Biological reviews of the Cambridge Philosophical Society (publishedVersion)
  • PubMed (publishedVersion)
  • FedUni ResearchOnline (Federation University Australia) (submittedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
Funders
  • U.S. Department of Agriculture
  • National Institute of Food and Agriculture
  • National Science Foundation
  • Natural Environment Research Council
  • Canada Research Chairs
  • David and Lucile Packard Foundation
Topics
  • Physical Sciences › Environmental Science › Nature and Landscape Conservation › Fish Ecology and Management Studies
  • Physical Sciences › Environmental Science › Ecology › Freshwater macroinvertebrate diversity and ecology
  • Physical Sciences › Environmental Science › Ecology › Aquatic Ecosystems and Biodiversity
Keywords
freshwater biodiversity, emerging threats, freshwater conservation, climate change, invasive species, infectious diseases, harmful algal blooms, hydropower, emerging contaminants, engineered nanomaterials, microplastic pollution, cumulative stressors, environmental flows, environmental DNA, dam removal, managed relocation, amphibians, fish, invertebrates, waterbirds
MeSH terms
Animals, Conservation of Natural Resources, Fresh Water, Humans, Risk Factors, Biodiversity, Climate Change

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