Taxonomic changes and non-native species: An overview of constraints and new challenges for macroinvertebrate-based indices calculation in river ecosystems

Guareschi, Simone; Wood, Paul J.

doi:10.1016/j.scitotenv.2019.01.008

Cited by 14 publications

(10 citation statements)

References 65 publications

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“…Furthermore, range expansions of many established INNS are occurring in line with ongoing anthropogenic modifications and climatic change (Seebens et al, 2017). Current freshwater monitoring methods are often associated with physical sightings or sampling of organisms which can lead to some INNS being overlooked in the early stages of invasion, or when species abundance is low (Guareschi & Wood, 2019; Havel et al, 2015). Moreover, identification of many INNS relies on knowledge of morphological identification features which can lead to cryptic, juvenile, or closely related species being overlooked (Blackman et al, 2017).…”

Section: Monitoring and Managing The Spread Of Innsmentioning

confidence: 99%

Biological invasions in rivers and associated ecosystems: New insights, challenges, and methodological advancements

Mathers

Guareschi

Pattison

2022

River Research & Apps

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Section: Monitoring and Managing The Spread Of Innsmentioning

confidence: 99%

Biological invasions in rivers and associated ecosystems: New insights, challenges, and methodological advancements

Mathers

Guareschi

Pattison

2022

River Research & Apps

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“…Invasive species are widely recognized as one of the primary threats to biodiversity globally due to their wide‐ranging ecological effects for individual populations and communities of native taxa, through to entire ecosystem functioning (Carbonell et al., 2017; Flood, Duran, Barton, Mercado‐Molina, & Trexler, 2020). However, managing the threat of invasive species remains an open challenge for biological conservation, biodiversity assessments, biomonitoring and restoration practices (Bruno et al., 2019; Guareschi & Wood, 2019).…”

Section: Introductionmentioning

confidence: 99%

Invasive crayfish alter the long‐term functional biodiversity of lotic macroinvertebrate communities

et al. 2020

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Invasive species represent one of the primary threats to global biodiversity. Despite acknowledged implications for taxonomic properties of ecological communities following invasion, functional measures remain poorly understood. We examined the long‐term implications of invasion by a crayfish species, Pacifastacus leniusculus, on functional alpha and beta diversity properties of lotic macroinvertebrate communities in three English regions. The dataset comprised 477 samples collected predominantly between 1990 and 2013. Unlike many invasion studies, we employed before and after invasion comparisons, in association with control rivers not invaded by crayfish. Functional richness and divergence metrics displayed the strongest responses to invasion, highlighting that P. leniusculus may alter the range of functional niches and extreme trait values (likely reflecting resistance and resilience mechanisms) displayed by macroinvertebrate communities. Interestingly, in one region, biodiversity gains seen in control rivers were not mirrored in invaded rivers, potentially suggesting that invasion inhibited ecological improvements. Invasion by signal crayfish resulted in functional compositional changes in two of the three English regions studied, with these rivers yielding greater ecological differences between pre‐ and post‐invasion periods relative to control rivers. This change was primarily driven by higher nestedness values in invaded rivers, with communities containing functional subsets relative to control rivers. The third region demonstrated no functional compositional changes or alterations in functional beta diversity associated with invasion. Our findings indicated that in most instances, the functional properties of macroinvertebrate communities responded to crayfish invasion and may therefore represent a complementary means to monitor the ecological condition of lotic ecosystems. Given their spatial transferability, functional traits could provide a platform to guide regional management practices in the face of biological invasions. A free Plain Language Summary can be found within the Supporting Information of this article.

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“…Orendt et al., 2010). Invasive species may constitute significant threats to the integrity of aquatic ecosystems that existing biomonitoring tools were not designed to address and may fail to detect their effects or presence within a waterbody (Guareschi & Wood, 2019; MacNeil et al., 2010; Vandekerkhove et al., 2013). Moreover, the integration of their presence and associated information into official biomonitoring and management frameworks has been applied heterogeneously internationally (Boon et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Extence et al., 1999; Hawkes, 1998). These scoring systems rarely recognise or integrate invasive invertebrate taxa, largely because their effect may be context specific and the dynamics of their spread difficult to assess and integrate within legislation (Guareschi & Wood, 2019). For example, Mathers et al.…”

Section: Introductionmentioning

confidence: 99%

“…Extence et al, 1999;Hawkes, 1998). These scoring systems rarely recognise or integrate invasive invertebrate taxa, largely because their effect may be context specific and the dynamics of their spread difficult to assess and integrate within legislation (Guareschi & Wood, 2019). For example, Mathers et al (2016) warned that care should be taken when interpreting routine taxonomic macroinvertebrate biomonitoring data where non-native crayfish were known to be present; and Vandekerkhove et al (2013) advocated the need for optimisation of methods for addressing the pressures exerted by invasive species.…”

Section: Introductionmentioning

confidence: 99%

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Invasive species influence macroinvertebrate biomonitoring tools and functional diversity in British rivers

Guareschi

Laini

England

et al. 2020

Journal of Applied Ecology

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Biological invasions could have major implications for the management and conservation of freshwater systems if they lead to a misclassification of waterbodies. However, there is limited understanding of the sensitivity of existing biomonitoring tools to invasive species in rivers; and even less known regarding how they influence community taxonomic and functional measures. This research explores the response of freshwater macroinvertebrate communities to biological invasion using taxonomic and functional indices. Utilising a long‐term dataset (spanning 2000–2019, 5,988 samples) from rivers in England, the performance of four biomonitoring tools (WHPT, WHPT‐ASPT, LIFE and PSI) and two community functional indices (functional richness and redundancy) was examined before and after the colonisation of the invasive species, Dikerogammarus haemobaphes (Eichwald, 1841; Crustacea: Gammaridae). This species represents a recent (first record 2012) and highly successful invader, allowing its range expansion within waterbodies to be examined in detail. Spatial (national and basin level) and seasonal (spring and autumn) effects were investigated using a before–after control–impact (BACI) experimental framework and linear mixed effects models. Results indicated that invasion by D. haemobaphes resulted in significant reductions to the WHPT index and functional diversity metrics (richness and redundancy) while more subtle patterns were observed for other metrics. Analysis of seasonal and individual river basins (River Trent and R. Thames) identified largely consistent responses. The establishment of D. haemobaphes also resulted in some modifications to the functional composition of aquatic communities primarily associated with voltinism and resistance features. Synthesis and applications. Our findings indicate that Dikerogammarus haemobaphes should be considered a significant pressure to riverine communities. These results have implications for biomonitoring, which informs managerial actions as effects may not be detected using a single taxonomic index. Community functional measures are useful in characterising the effects of invasive species and may form a valuable part of the ‘toolbox’ used for studying biological invasions in rivers. The research illustrates the need to consider the wider threats posed by invasive species on the long‐term integrity of freshwaters and the efficacy of freshwater biomonitoring tools.

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Taxonomic changes and non-native species: An overview of constraints and new challenges for macroinvertebrate-based indices calculation in river ecosystems

Cited by 14 publications

References 65 publications

Biological invasions in rivers and associated ecosystems: New insights, challenges, and methodological advancements

Biological invasions in rivers and associated ecosystems: New insights, challenges, and methodological advancements

Invasive crayfish alter the long‐term functional biodiversity of lotic macroinvertebrate communities

Invasive species influence macroinvertebrate biomonitoring tools and functional diversity in British rivers

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