Fish and macroinvertebrate assemblages reveal extensive degradation of the world's rivers

Global Change Biology, Год журнала: 2022, Номер 29(2), С. 355 - 374

Опубликована: Сен. 22, 2022

Rivers suffer from multiple stressors acting simultaneously on their biota, but the consequences are poorly quantified at global scale. We evaluated biological condition of rivers globally, including largest proportion countries Global South published to date. gathered macroinvertebrate- and fish-based assessments 72,275 37,676 sites, respectively, 64 study regions across six continents 45 nations. Because were based differing methods, different systems consolidated into a 3-class system: Good, Impaired, or Severely following common guidelines. The sites in each class by area was calculated region assigned Köppen-Geiger climate type, Human Footprint score (addressing landscape alterations), Development Index (HDI) social welfare), % with good ambient water quality, protected freshwater key biodiversity areas; forest net change rate. found that 50% macroinvertebrate 42% fish Good condition, whereas 21% 29% respectively. poorest conditions occurred Arid Equatorial climates best Snow climates. Impaired associated (Pearson correlation coefficient) higher HDI scores, poorer physico-chemical lower proportions areas. quality increased forested It is essential implement statutory bioassessment programs Asian, African, American countries, continue them Oceania, Europe, North America. There need invest fish, as there less information globally strong indicators degradation. Our highlights increase extent number river catchments, preserve restore natural areas treat wastewater discharges, improve connectivity.

Язык: Английский

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The impacts of alien species on river bioassessment

Journal of Environmental Management, Год журнала: 2025, Номер 374, С. 123874 - 123874

Опубликована: Янв. 8, 2025

Язык: Английский

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Bending the curve of global freshwater biodiversity loss: what are the prospects?

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Год журнала: 2024, Номер unknown

Опубликована: Сен. 2, 2024

ABSTRACT Freshwater biodiversity conservation has received substantial attention in the scientific literature and is finally being recognized policy frameworks such as Global Biodiversity Framework its associated targets for 2030. This important progress. Nonetheless, freshwater species continue to be confronted with high levels of imperilment widespread ecosystem degradation. An Emergency Recovery Plan (ERP) proposed 2020 comprises six measures intended “bend curve” loss, if they are widely adopted adequately supported. We review evidence suggesting that combined intensity persistent emerging threats become so serious current projected efforts preserve, protect restore inland‐water ecosystems may insufficient avert losses coming decades. In particular, climate change, complex harmful impacts, will frustrate attempts prevent from already affected by multiple threats. Interactions among these limit recovery populations exacerbate declines resulting local or even global extinctions, especially low‐viability degraded fragmented ecosystems. addition impediments represented we identify several other areas where absolute scarcity fresh water, inadequate information predictive capacity, a failure mitigate anthropogenic stressors, liable set limits on biodiversity. Implementation ERP rapidly at scale through many dispersed actions focused regions intense threat, together an intensification ex‐situ efforts, necessary preserve native during increasingly uncertain climatic future which poorly understood, emergent interacting have more influential. But implementation must accompanied improve energy food security humans – without further compromising condition Unfortunately, political policies arrest environmental challenges change do not inspire confidence about possible success ERP. parts world, Anthropocene seems certain include extended periods uncontaminated surface runoff inevitably appropriated humans. Unless there step‐change societal awareness commitment biodiversity, established methods protecting bend curve enough continued degradation loss.

Язык: Английский

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Successes and failures of conservation actions to halt global river biodiversity loss

Опубликована: Янв. 20, 2025

Язык: Английский

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Responses of multimetric indices to disturbance are affected by index construction features

Environmental Reviews, Год журнала: 2024, Номер 32(2), С. 278 - 293

Опубликована: Фев. 22, 2024

Multimetric indices (MMIs) are used worldwide to assess the ecological conditions of aquatic and terrestrial ecosystems. Different criteria approaches construct MMIs, resulting in widely different indices. Therefore, scientists, managers, policymakers sometimes question whether such MMIs useful for biomonitoring bioassessment programs. Crucial design issues programs include MMI responsiveness, bioindicator group used, survey design, field sampling methods, level taxonomic resolution, metric selection scoring, reference condition identification. We performed a meta-analysis on development applications analyze response disturbance factors determine degree which construction features influence their responsiveness anthropogenic disturbances. Web Science database find articles that applied an related values environmental stressor, we extracted data from 157 articles. random-effects modeling estimate overall effect responses subgroup analysis extent sizes varied as function features. found had major disturbance. The type, number metrics, ecosystem type were contributed more weakly size variance. general was little affected by group, criteria, or scoring method. These findings have important implications designing programs, including developing improving cost-effective biological indices, because they could enhance application protocols.

Язык: Английский

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Predicting climate heating impacts on riverine fish species diversity in a biodiversity hotspot region

Scientific Reports, Год журнала: 2023, Номер 13(1)

Опубликована: Сен. 1, 2023

Co-occurring biodiversity and global heating crises are systemic threats to life on Earth as we know it, especially in relatively rare freshwater ecosystems, such Iran. Future changes the spatial distribution richness of 131 riverine fish species were investigated at 1481 sites Iran under optimistic pessimistic climate scenarios for 2050s 2080s. We used maximum entropy modeling predict species' potential distributions by hydrologic unit (HU) occupancy current future conditions through use nine environmental predictor variables. The most important variable determining was HU location, followed elevation, variables, slope. Thirty-seven predicted decrease their habitat all scenarios. southern Caspian faces highest reductions western Zagros northwestern These results can be managers plan conservational strategies ease dispersal species, those that greatest risk extinction or invasion rivers fragmented dams.

Язык: Английский

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Do microplastics and climate change negatively affect shredder invertebrates from an amazon stream? An ecosystem functioning perspective

Environmental Pollution, Год журнала: 2023, Номер 321, С. 121184 - 121184

Опубликована: Янв. 31, 2023

Язык: Английский

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Unveiling relationships between ecosystem services and aquatic communities in urban streams

Ecological Indicators, Год журнала: 2023, Номер 153, С. 110433 - 110433

Опубликована: Июнь 6, 2023

River and stream ecosystems within cities can provide important Ecosystem Services (ES) to urban population along with the maintenance of biodiversity. Increasing urbanization land use change affect biodiversity, impacting ES provision, but relationships between biota are complex poorly understood. This study aims explore aquatic biodiversity (communities' composition structure), provided by streams. Nine streams were surveyed a city area (up 8 km centre) focusing on common biological indicators (i.e., macroinvertebrates diatoms), as well several Provisioning (N = 7), Regulation 14) Cultural 23) services for this type ecosystem. Urban sampling sites also assessed in terms their degree, according surrounding imperviousness (IMD). Pearson correlations showed trends negative IMD both Regulating services. Yet, effects seemed be mitigated due enhanced hidromorphological site features. The community structure invertebrates diatoms was differently associated (BIOENV analysis). Whereas macroinvertebrate communities related specifically indicators, diatom responded just regulating indicators. Overall, that is linkable streams, such relationship depends specific mainly Additionally, used suitable indicator potential supplying ecosystem shows value goes beyond known structural functional integrity river ecosystems. These results reinforce need protect nature running water urbanized areas, they green blue solutions sustainability cities.

Язык: Английский

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Future-proofing the emergency recovery plan for freshwater biodiversity

Environmental Reviews, Год журнала: 2023, Номер 32(3), С. 350 - 365

Опубликована: Июнь 19, 2023

Freshwater biodiversity loss is accelerating globally, but humanity can change this trajectory through actions that enable recovery. To be successful, these require coordination and planning at a global scale. The Emergency Recovery Plan for freshwater aims to reduce the risk six priority actions: (1) accelerate implementation of environmental flows; (2) improve water quality sustain aquatic life; (3) protect restore critical habitats; (4) manage exploitation species riverine aggregates; (5) prevent control nonnative invasions in (6) safeguard connectivity. These implemented using future-proofing approaches anticipate future risks (e.g., emerging pollutants, new invaders, synergistic effects) minimize likely stressors make conservation more resilient climate other challenges. While uncertainty with respect past observations not concern biodiversity, has distinction accounting conditions have no historical baseline. level unprecedented. Future-proofing will anticipating changes developing implementing address those changes. Here, we showcase successful local case studies examples. Ensuring response options within are future-proofed provide decision makers science-informed choices, even face uncertain potentially conditions. We an inflection point loss; learning from defeats successes support improved toward sustainable future.

Язык: Английский

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Biomonitoring for Watershed Protection from a Multiscale Land-Use Perspective

Diversity, Год журнала: 2023, Номер 15(5), С. 636 - 636

Опубликована: Май 8, 2023

The types and intensification of land use in the watershed affect living organisms aquatic ecosystems differently; this impact will also vary according to temporal spatial scales. Understanding these interactions is crucial design biomonitoring programs detect effect different pollutants freshwater improve management conservation strategies. Therefore, paper qualitatively reviews studies evaluate on multiple scales watersheds. organized into four sections. first section presents systems (streams, rivers, lakes, reservoirs). In second section, we describe characteristics main types. third explain how biomonitoring. Finally, fourth focus planning future prediction discuss models eDNA Our review assist decision-making regarding watersheds guide bioindicators for various diverse worldwide.

Язык: Английский

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