Long-term trends in crayfish invasions across European rivers

Soto, Ismael; Ahmed, Danish A.; Beidas, Ayah; Oficialdegui, Francisco J.; Tricarico, Elena; Angeler, David G.; Amatulli, Giuseppe; Briski, Elizabeta; Datry, Thibault; Dohet, Alain; Domisch, Sami; England, Judy; Feio, Maria João; Forcellini, Maxence; Johnson, Richard K.; Jones, Iwan J; Larrañaga, Aitor; L’Hoste, Lionel; Murphy, John F.; Schäfer, Ralf B.; Lan-sun, Shen; Kouba, Antonín; Haubrock, Phillip J.

doi:10.1016/j.scitotenv.2023.161537

Cited by 15 publications

(1 citation statement)

References 134 publications

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“…These possibilities are contingent upon the characteristics of the invaded ecosystem, but non‐native species abundance, biomass, occupied area, and impact may not always strictly correlate. However, while any of these four measurements may serve as a proxy for both impact and spread, abundance in particular may reflect a population's potential to spread (Booy et al., 2020) and thus, function as an indicator of a population's potential invasiveness (Soto, Ahmed, Beidas, et al., 2023; Soto et al., 2024).…”

Section: Discussionmentioning

confidence: 99%

Biological invasions are a population‐level rather than a species‐level phenomenon

Haubrock,

Soto,

Ahmed

et al. 2024

Global Change Biology

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Biological invasions pose a rapidly expanding threat to the persistence, functioning and service provisioning of ecosystems globally, and to socio‐economic interests. The stages of successful invasions are driven by the same mechanism that underlies adaptive changes across species in general—via natural selection on intraspecific variation in traits that influence survival and reproductive performance (i.e., fitness). Surprisingly, however, the rapid progress in the field of invasion science has resulted in a predominance of species‐level approaches (such as deny lists), often irrespective of natural selection theory, local adaptation and other population‐level processes that govern successful invasions. To address these issues, we analyse non‐native species dynamics at the population level by employing a database of European freshwater macroinvertebrate time series, to investigate spreading speed, abundance dynamics and impact assessments among populations. Our findings reveal substantial variability in spreading speed and abundance trends within and between macroinvertebrate species across biogeographic regions, indicating that levels of invasiveness and impact differ markedly. Discrepancies and inconsistencies among species‐level risk screenings and real population‐level data were also identified, highlighting the inherent challenges in accurately assessing population‐level effects through species‐level assessments. In recognition of the importance of population‐level assessments, we urge a shift in invasive species management frameworks, which should account for the dynamics of different populations and their environmental context. Adopting an adaptive, region‐specific and population‐focused approach is imperative, considering the diverse ecological contexts and varying degrees of susceptibility. Such an approach could improve and refine risk assessments while promoting mechanistic understandings of risks and impacts, thereby enabling the development of more effective conservation and management strategies.

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Section: Discussionmentioning

confidence: 99%

Biological invasions are a population‐level rather than a species‐level phenomenon

Haubrock,

Soto,

Ahmed

et al. 2024

Global Change Biology

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The faunal Ponto-Caspianization of central and western European waterways

et al. 2023

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As alien invasive species are a key driver of biodiversity loss, understanding patterns of rapidly changing global species compositions depends upon knowledge of invasive species population dynamics and trends at large scales. Within this context, the Ponto-Caspian region is among the most notable donor regions for aquatic invasive species in Europe. Using macroinvertebrate time series collected over 52 years (1968–2020) at 265 sites across 11 central and western European countries, we examined the occurrences, invasion rates, and abundances of freshwater Ponto-Caspian fauna. We examined whether: (i) successive Ponto-Caspian invasions follow a consistent pattern of composition pioneered by the same species, and (ii) Ponto-Caspian invasion accelerates subsequent invasion rates. In our dataset, Ponto-Caspian macroinvertebrates increased from two species in 1972 to 29 species in 2012. This trend was parallelled by a non-significant increasing trend in the abundances of Ponto-Caspian taxa. Trends in Ponto-Caspian invader richness increased significantly over time. We found a relatively uniform distribution of Ponto-Caspian macroinvertebrates across Europe without any relation to the distance to their native region. The Ponto-Caspian species that arrived first were often bivalves (46.5% of cases), particularly Dreissena polymorpha, followed secondarily by amphipods (83.8%; primarily Chelicorophium curvispinum and Dikerogammarus villosus). The time between consecutive invasions decreased significantly at our coarse regional scale, suggesting that previous alien establishments may facilitate invasions of subsequent taxa. Should alien species continue to translocate from the Ponto-Caspian region, our results suggest a high potential for their future invasion success highly connected central and western European waters. However, each species’ population may decline after an initial ‘boom’ phase or after the arrival of new invasive species, resulting in different alien species dominating over time.

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Valuing the information hidden in true long-term data for invasion science

Haubrock

Soto

2023

Biol Invasions

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Invasive species pose a significant threat to global biodiversity and human well-being. Despite the widespread use of long-term biomonitoring data in many natural science fields, the analysis of long-term time series with a focus on biological invasions is uncommon. To address this gap, we used twenty macroinvertebrate time series from the highly anthropogenically altered Rhine River, collected over 32 years from 1973 to 2005. We examined the adequacy of the data in capturing non-native species trends over time and explored trends in alpha, beta, and gamma diversity of non-native species with several climatic and site-specific predictors. Our findings revealed that the data adequately captured a saturating non-native species richness over time. Additionally, we observed an increase in both alpha and gamma diversity of both native and non-native species over time, with a recent dip in trends. Beta diversity trends were more complicated, but eventually increased, contrasting trends in native species beta diversity. Our applied models indicate that in this highly altered ecosystem, climatic shifts were insignificant, while time was the primarily driving factor. Proximity to anthropogenic structures and the distance to the outlet were the only site-specific predictors facilitating non-native species diversity. These findings highlight the value and importance of long-term time series for the study of invasive species, particularly long-term invasion dynamics and once again underline that naturality of ecosystems precede the effect of climate change.

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Long-term trends in crayfish invasions across European rivers

Cited by 15 publications

References 134 publications

Biological invasions are a population‐level rather than a species‐level phenomenon

Biological invasions are a population‐level rather than a species‐level phenomenon

The faunal Ponto-Caspianization of central and western European waterways

Valuing the information hidden in true long-term data for invasion science

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