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Leveraging outstanding first records to advance invasion science - Biological Invasions

Biological Invasions -

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Quantifying Colonisation Pressure as a Driver of Secondary Spread During the <fc><fi>Dreissena polymorpha</fi></fc> Invasion of German River Networks

Biological invasions have become a major component of global change, yet the processes governing secondary spread after initial introductions remain insufficiently resolved. A specific and central...

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The Role of Sediment Supply on Fish Habitat Dynamics of a Morphologically Active River Widening

Restoration measures, such as river widening, aim to reactivate key morphodynamic processes, which are critical drivers of fluvial habitat dynamics. While some evidence supports the important role of...

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Navigating the salinity gradient: Individual variation in habitat use and migration of European eel revealed by otolith microchemistry

Knowledge regarding variation in habitat use among individuals is crucial for understanding population dynamics and for management and conservation measures. This is especially important for diadromous fishes that shift between habitats, being affected by external pressures and environmental change in different habitats over ontogeny. Herer, we assessed individual variation in habitat use of European eel along a salinity gradient, ranging from fully marine to freshwater in northern Europe, using otolith microchemistry data from >3600 eel together with established time-series segmentation and clustering methods. We show that eel display high degree of individual variation in habitat use. Assigned life-histories included coastal resident, freshwater resident, and coastal and freshwater habitat shifting individuals. Coastal resident eels were observed in a large range of salinities. Given the widespread occurrence of migration barriers in freshwater, it is unknown whether the coastal resident eel preferred that habitat, or if it was the only available habitat for them. Our findings nonetheless highlight the need to include coastal habitats when assessing population development and silver eel production of the critically endangered European eel. ### Competing Interest Statement The authors have declared no competing interest. Swedish Centre for Sustainable Hydropower (SVC), VKU31026 Swedish University of Agricultural Sciences, https://ror.org/02yy8x990, SLU.ua.2024.4.1-3372, SLU.aqua.2025.1.1-46

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Behaviour of European eel <fi>Anguilla anguilla</fi> transitioning from the yellow resident to the silver migratory stage in marine waters

Current knowledge on the continental shelf and transatlantic spawning migration of the European eel (Anguilla anguilla) is based on silver eels outmigrating from fresh water. However, an unknown prop...

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High retention rate of Carlin tags and no effects on growth and condition of PIT tagging - a long-term field study on European eel | Aquatic Living Resources

Aquatic Living Resources, Fisheries Science, Aquaculture, Aquatic Biology and Ecology

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Downstream Passage Performance of European Silver Eels (Anguilla anguilla): The Importance of Phenotypic Variation and Rack Design

During their spawning migration, European silver eels frequently encounter hydropower facilities where successful downstream passage is essential for the conservation of this critically endangered sp...

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Canadian Science Publishing

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Data-driven forecasts of regional arrivals of non-native vertebrates worldwide

Aim To forecast near-future arrivals of non-native terrestrial and freshwater vertebrates at the regional level. Location Global (geopolitical regions worldwide, including countries and main administrative divisions). Methods We compiled first regional record data and assembled functional and macroecological variables for 1,931 non-native vertebrate species. For each region, we identified ‘recently arrived’ non-native species using retrospective windows of thirty and twenty years ending in 2015 (1986–2015; 1996–2015). We then fitted region-specific random-forest models classifying recently arrived species versus those not yet arrived using as predictors: (i) harmonised species traits (e.g., habitat, diet, body size and native-range attributes) and (ii) spread history, capturing time since first record elsewhere. Predictive performance was evaluated using leave-one-out cross-validation, comparing full models with trait-only and spread-only variants. We also assessed relationships between predictive accuracy, predictor importance, and the geographic positioning and trade connectedness of regions. Finally, we predicted region-specific probabilities of arrival for species not yet recorded. Results Forecasting accuracy was consistently high across regions and taxa, with AUC values above 0.9 in more than half of the focal regions. Full models substantially outperformed models using either predictor set alone, and spread-history-only models typically exceeded trait-only models. Relative importance of spread-history predictors declined with geographic distance to the focal region, whereas predictability was lower in highly trade-connected regions. Predicted near-future high-risk arrivals were dominated by birds and freshwater fishes and showed strong regional structuring. A small set of species ranked highly across many regions (e.g., birds: Phasianus colchicus, Acridotheres tristis, Amandava amandava, Colinus virginianus, Corvus splendens and Lonchura malacca ; fishes: Coregonus peled and Oreochromis mossambicus ; mammal : Oryctolagus cuniculus ), suggesting substantial unrealised spread potential. Main conclusions Near-future regional arrivals of non-native vertebrates are predictable from spread history and species traits. This enables scalable, updateable regional watchlists to support prevention, early detection and horizon scanning. ### Competing Interest Statement The authors have declared no competing interest. Fundação para a Ciência e Tecnologia, https://ror.org/00snfqn58, https://doi.org/10.54499/2023.12533.PEX, https://doi.org/10.54499/UID/00295/2025

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Canadian Science Publishing

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Genetic composition of facultatively anadromous brown trout <fi>Salmo trutta</fi> L. in a freshwater‐lake system

Brown trout (Salmo trutta) has adapted to a wide range of habitats and displays a variety of life-history strategies. Being facultatively anadromous, populations without migration barriers to the sea...

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Do Habitat Restoration Efforts and the Associated Releases of Hatchery‐Reared Fish Affect the Genetic Diversity and Integrity of Native Brown Trout Populations?

Habitat restoration may protect brown trout (Salmo trutta) populations from loss of genetic diversity by increasing environmental carrying capacity and, consequently, population size. However, the ac...

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Canadian Science Publishing

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Ontogenetic shifts in growth and habitat use of freshwater Coastal Cutthroat Trout revealed through otolith analysis of multiple elements

Otolith microchemistry is a widely used tool in fisheries research to determine migration patterns, stock structure, and variation in habitat utilization. This study combined multiple analytical metho...

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Thermal tolerance and acclimation limits in bull trout (<fi>Salvelinus confluentus</fi>) alevin

The critical thermal maximum (CTmax) of bull trout (Salvelinus confluentus) alevin was measured after 3 weeks of acclimation to 4–21°C. CTmax increased from 24.3 at 4°C to 26.7 at 9°C, plateaued betw...

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Phylogeny of Cutthroat Trout (<fi>Oncorhynchus clarkii</fi>) Based on Full Mitochondrial Genomes With Comments on Species Delimitation and Taxonomy

Despite the important role that species concepts and taxonomy play in understanding the evolution of species, taxonomists have struggled to describe the relationship between many organisms. Here, usi...

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Validate User

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Resource use by threatened, native Bull Trout (<fi>Salvelinus confluentus</fi>) in the presence of two non‐native salmonids

Introduction of non-native species contributes to the global decline of freshwater fishes by disrupting the diet and resources of native species through competition. Despite the potential for non-nat...

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Invasive hybridization has unpredicted and variable effects on trout survival in contrasting environments

Invasive hybridization between native and introduced species is widespread, especially in fishes, yet its effects on fitness-related traits across environments remain poorly understood. We combined in...

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Oxygen uptake of rainbow trout during acute warming: effects of oxygen supersaturation and aerobic exercise

Naturally occurring oxygen supersaturation (hyperoxia) could provide refuge for fish from heat waves if thermal tolerance is limited by the ability to uptake sufficient oxygen to meet cellular oxygen ...

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