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Open research questions in Freshwater macroinvertebrate diversity and ecology

328 gap statements mined from Freshwater macroinvertebrate diversity and ecology papers in our 7.9M-paper local library, which holds 1,277 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Further research on the impacts of mining activities on adjacent water bodies is also needed in the context of the challenges associated with the sustainable transition to clean energy, while taking into account the country’s economic and social realities in determining the timeline and approach for CFPP closure.

    Impact of Coal-Fired Power Plant Activities on the Ecological Status of River Ecosystems: Case Study of Sokolitsa River, Bulgaria · 2026 · DOI

  • Similar quality standards have not been established in Bulgaria either. The limited evidence on their ecological effects may partly explain why sulfates have not yet been widely regulated as river basin-specific pollutants (RBSPs) in most EU Member States.

    Impact of Coal-Fired Power Plant Activities on the Ecological Status of River Ecosystems: Case Study of Sokolitsa River, Bulgaria · 2026 · DOI

  • Future research should focus on expanding temporal coverage, incorporating hydrological variables such as discharge, validating predictive models using independent datasets, and developing composite indices that quantitatively integrate physicochemical, biological, hotspot, and machine-learning components.

    Integrated Analysis of Spatial Water-Quality Gradients, Hotspots, and Inferred Hydrological Resilience Using Bioindicators and Machine Learning in a Semi-Arid River Basin (Ecuador) · 2026 · DOI

  • Morphologically, these four new species belong to three species groups; however, none of these species groups was recovered as a monophyletic clade in the NJ tree constructed, based on barcodes and the evolutionary relationships amongst the various species groups remain unclear.

    Integrative taxonomy revealed four new species and four new records of the genus Hydropsyche from China (Trichoptera, Hydropsychidae) · 2026 · DOI

  • There is a need for effective tools for water quality assessment in hilly and mountain streams. The study identifies a gap in the use of the EPT index for water quality assessment.

    Aquatic Insects (Ephemeroptera, Plecoptera and Trichoptera) Metric as an Important Tool in Water Quality Assessment in Hilly and Mountain Streams · 2024 · DOI

  • The study only examined the impact of a single flood event. The study only considered a limited number of environmental characteristics. The study did not examine the long-term effects of the flood on the macroinvertebrate community.

    The Impact of Catastrophic Floods on Macroinvertebrate Communities in Low-Order Streams: A Study from the Apennines (Northwest Italy) · 2024 · DOI

  • It highlights the need to manage ponds and their catchments appropriately to maintain their biodiversity. The study also mentions the challenge of identifying the species of macrophytes and macroinvertebrates, particularly in cases where they could not be determined at the species level.

    Diversity of Macrophytes and Macroinvertebrates in Different Types of Standing Waters in the Drava Field · 2024 · DOI

  • Most aquatic studies of litter mixing effects have focused on terrestrial litter decomposition in streams, neglecting interactions between particulate and dissolved organic matter derived from autochthonous plant litter. The relationship between litter diversity and decomposition is not well understood, particularly in aquatic ecosystems.

    Macrophyte litter diversity affects microbial respiration but not litter mass loss · 2026 · DOI

  • This measure naturally depends on the taxon richness and may lead to inconsistent results (see), suggesting that none of the methods artificially alter H’.

    Sampling Techniques Affect Mayfly Nymph Community Indices and May Bias Bioassessments · 2025 · DOI

  • As mentioned above, there are currently insufficient data for the compilation of a Red List of Italian Ephemeroptera, although this is a matter of extreme urgency.

    Biodiversity of Italian freshwaters: an updated checklist of mayfly species (Ephemeroptera) as a starting point for the next taxonomic (r)evolution · 2025 · DOI

  • Further research is needed to examine the long-term effects of floods on macroinvertebrate communities. Studies should investigate the impact of multiple flood events on macroinvertebrate communities. Research should focus on developing effective management and conservation strategies for aquatic ecosystems in the context of current climate change.

    The Impact of Catastrophic Floods on Macroinvertebrate Communities in Low-Order Streams: A Study from the Apennines (Northwest Italy) · 2024 · DOI

  • Despite their ecological importance and increasing exposure to anthropogenic pressures such as lithium extraction, the diversity and composition of their aquatic invertebrate communities remain poorly documented.

    Environmental Gradients and Turnover Shape Aquatic Invertebrate Communities in High‐Andean Ecosystems of Northern Chile · 2026 · DOI

  • Although macroinvertebrate community plays a critical role in sustaining biogeochemical cycling and river ecosystem stability, the extent to which anthropogenic activities and land use changes affect macroinvertebrate biodiversity and sediment ecological health remains insufficiently resolved.

    Spatial distribution of benthic macroinvertebrate community in a sediment-laden river: Influence of anthropogenic activities and land use changes · 2026 · DOI

  • The knowledge about the genus Hydropsyche Pictet, 1834 in the Middle East and Caucasus ecoregions is still scarce with several species described during the past years.

    Two new species of the genus Hydropsyche Pictet, 1834 (Trichoptera, Hydropsychidae) from the Middle East and Caucasus ecoregions · 2026 · DOI

  • Compelling data at large spatial scales are scarce, especially for river networks.

    Functional macroinvertebrate diversity stabilizes decomposition among leaf litter resources across a river network · 2025 · DOI

  • Systematic, taxonomic and biogeographic resolution within Somatochlora remains unclear, with numerous hypotheses of relatedness based on wing veins, male claspers (epiproct and paraprocts) and nymphs.

    Systematics and biogeography of the Holarctic dragonfly genus Somatochlora (Anisoptera: Corduliidae) · 2025 · DOI

  • Although the number of Hydropsyche larvae described in China has increased rapidly in recent years, larvae of more than 75% of Chinese Hydropsyche species remain unknown.

    Descriptions of hitherto unknown larvae of the genus Hydropsyche Pictet, 1834 from China (Trichoptera, Hydropsychidae) · 2025 · DOI

  • There are very few multimetric indices developed in Nigeria to assess the ecological health of riverine systems. None of the multimetric indices was developed for river stations draining urban and agricultural catchments.

    Developing Macroinvertebrate Biotic Indices in Nigerian Urban-Agricultural River Catchments: Is the Continuous Scoring System More Effective than Discrete Scoring System? · 2024 · DOI

  • Collectively, these findings provide an improved baseline for biodiversity knowledge in this sparsely characterized region, with important implications for conservation and environmental monitoring.

    Aquatic beetles in the Colombian Andean–Amazon region: an analysis of their composition and diversity · 2026 · DOI

  • We concluded that environmental heterogeneity and biogeographical factors are determinants of odonate biodiversity in the region, with Anisoptera following a classical hierarchical community assembly mechanism and Zygoptera is being influenced and limited by the filter created by environmental factors.

    Environmental drivers of Odonate assemblages across biogeographic provinces in the Mexican Transition Zone · 2026 · DOI

  • Investigate litter diversity-decomposition relationship in different ecosystems, - Examine the effects of litter diversity on microbial communities, - Study the impact of environmental changes on litter diversity…

    Macrophyte litter diversity affects microbial respiration but not litter mass loss · 2026 · DOI

  • While some environmental variables significantly affected assemblage structure, the unexplained variability suggests that further research is needed on other factors, such as exposure to the mountain, sedimentation, nutrient content, and stream sinuosity, or a better explanation…

    Seasonal Dynamics and Factors Shaping Aquatic Insect Assemblages in Mountain Streams of the Pannonian Lowland Ecoregion · 2025 · DOI

  • This research, which constitutes the first systematic study of macroinvertebrates associated with waterfalls in the Neotropics, highlights the importance of exploring understudied environments to advance our knowledge of freshwater organism ecology and enhance conservation efforts for tropical biodiversity.

    Waterfalls as a reservoir for caddisfly larvae (Insecta, Trichoptera): exploring a poorly known habitat · 2025 · DOI

  • Further research could investigate the effectiveness of RNRs in protecting other types of ecosystems, - Studies could examine the impact of different disturbance types on macroinvertebrate communities, - Research could focus on the relationship between taxonomic and functional diversity in other…

    Functional Diversity of Macroinvertebrate Communities in River Nature Reserves of Spain · 2024 · DOI

  • Future research should address critical bottlenecks reference condition determination, aquatic ecoregionalization and methodological standardization, facilitate…

    Research Progress and Prospects of Aquatic Ecological Assessment · 2026 · DOI

Most-cited papers in Freshwater macroinvertebrate diversity and ecology

Most recent work

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Open questions raised by papers listed on this page include: (1) Similar quality standards have not been established in Bulgaria either (“Impact of Coal-Fired Power Plant Activities on the Ecological Status of River…”, 2026); (2) The relationship between litter diversity and decomposition is not well understood, particularly in aquatic ecosystems (“Macrophyte litter diversity affects microbial respiration but not litter mass…”, 2026); (3) The knowledge about the genus Hydropsyche Pictet, 1834 in the Middle East and Caucasus ecoregions is still scarce with several species described during the past years (“Two new species of the genus Hydropsyche Pictet, 1834 (Trichoptera,…”, 2026); (4) Compelling data at large spatial scales are scarce, especially for river networks (“Functional macroinvertebrate diversity stabilizes decomposition among leaf…”, 2025); (5) Systematic, taxonomic and biogeographic resolution within Somatochlora remains unclear, with numerous hypotheses of relatedness based on wing veins, male claspers (epiproct and paraprocts) and nymphs (“Systematics and biogeography of the Holarctic dragonfly genus Somatochlora…”, 2025). 328 gap statements have been mined from Freshwater macroinvertebrate diversity and ecology papers in our 7.9M-paper local library, which holds 1,277 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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