Catherine Gutmann Roberts

Bournemouth University

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J. Robert Britton

Bournemouth University

Adrian C. Pinder

Bournemouth University

Katrin Attermeyer

Wasser Cluster Lunz

Sophie Cauvy‐Fraunié

Forum Réfugiés - Cosi

Magdalena Nagler

Universität Innsbruck

Pascal Bodmer

Université du Québec à Montréal

Jordi‐René Mor

Water Research Institute

Thomas Fuß

Leibniz Institute of Freshwater Ecology and Inland Fisheries

Francesca Pilotto

Norwegian Institute for Nature Research

Vesela Evtimova

Institute of Biodiversity and Ecosystem Research

Cooperative Institutions

Bournemouth University

Wasser Cluster Lunz

Uppsala University

University of Vienna

Leibniz Institute of Freshwater Ecology and Inland Fisheries

Catalan Institute for Water Research

University of Girona

Centre National de la Recherche Scientifique

University of Hull

Berlin Center for Genomics in Biodiversity Research

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Aquatic connectivity: challenges and solutions in a changing climate

Journal of Fish Biology (2024)

P.A. Franklin Tea Bašić Phil I. Davison Katie Dunkley Jonathan Ellis

The challenge of managing aquatic connectivity in a changing climate is exacerbated in the presence of additional anthropogenic stressors, social factors, and economic drivers. Here we discuss these issues in the context of structural and functional connectivity for aquatic biodiversity, specifically fish, in both the freshwater and marine realms. We posit that adaptive management strategies that consider shifting baselines and the socio-ecological implications of climate change will be required to achieve management objectives. The role of renewable energy expansion, particularly hydropower, is critically examined for its impact on connectivity. We advocate for strategic spatial planning that incorporates nature-positive solutions, ensuring climate mitigation efforts are harmonized with biodiversity conservation. We underscore the urgency of integrating robust scientific modelling with stakeholder values to define clear, adaptive management objectives. Finally, we call for innovative monitoring and predictive decision-making tools to navigate the uncertainties inherent in a changing climate, with the goal of ensuring the resilience and sustainability of aquatic ecosystems.

Adaptive Management

Resilience

10.1111/jfb.15727

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Citations (8)

Abundance and biogeography of methanogenic and methanotrophic microorganisms across European streams

Journal of Biogeography (2020)

Magdalena Nagler Nadine Praeg Georg H. Niedrist Katrin Attermeyer Núria Catalán

Abstract Aim Although running waters are getting recognized as important methane sources, large‐scale geographical patterns of microorganisms controlling the net methane balance of streams are still unknown. Here we aim at describing community compositions of methanogenic and methanotrophic microorganisms at large spatial scales and at linking their abundances to potential sediment methane production (PMP) and oxidation rates (PMO). Location The study spans across 16 European streams from northern Spain to northern Sweden and from western Ireland to western Bulgaria. Taxon Methanogenic archaea and methane‐oxidizing microorganisms. Methods To provide a geographical overview of both groups in a single approach, microbial communities and abundances were investigated via 16S rRNA gene sequencing, extracting relevant OTUs based on literature; both groups were quantified via quantitative PCR targeting mcrA and pmoA genes and studied in relation to environmental parameters, sediment PMP and PMO, and land use. Results Diversity of methanogenic archaea was higher in warmer streams and of methanotrophic communities in southern sampling sites and in larger streams. Anthropogenically altered, warm and oxygen‐poor streams were dominated by the highly efficient methanogenic families Methanospirillaceae , Methanosarcinaceae and Methanobacteriaceae , but did not harbour any specific methanotrophic organisms. Contrastingly, sediment communities in colder, oxygen‐rich waters with little anthropogenic impact were characterized by methanogenic Methanosaetaceae , Methanocellaceae and Methanoflorentaceae and methanotrophic Methylococcaceae and Cd . Methanoperedens. Representatives of the methanotrophic Crenotrichaceae and Methylococcaceae as well as the methanogenic Methanoregulaceae were characteristic for environments with larger catchment area and higher discharge. PMP increased with increasing abundance of methanogenic archaea, while PMO rates did not show correlations with abundances of methane‐oxidizing bacteria. Main conclusions Methanogenic and methanotrophic communities grouping into three habitat types suggest that future climate‐ and land use changes may influence the prevailing microbes involved in the large‐scale stream‐related methane cycle, favouring the growth of highly efficient hydrogenotrophic methane producers. Based on these results, we expect global change effect on PMP rates to especially impact rivers adjacent to anthropogenically disturbed land uses.

10.1111/jbi.14052

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Citations (10)

Inheritance in Dogs with Special Reference to Hunting Breeds

Ö. Winge Catherine Gutmann Roberts

Inheritance

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Environmental influences on the phenology of immigrating juvenile eels over weirs at the tidal limit of regulated rivers

Hydrobiologia (2024)

Rose M. Boardman Adrian C. Pinder Adam T. Piper Catherine Gutmann Roberts Rosalind M. Wright

Abstract Recruitment of the catadromous and critically endangered European eel Anguilla anguilla in Europe has declined substantially since the 1980s, with considerable knowledge gaps remaining in many aspects of their life cycle. The aim was to assess eel migration phenology in three regulated rivers in England between 2009 and 2019 through analyses of eel numbers using passes at their tidal limits, with calculation of the annual timings of migration initiation (10% of all eels passed, T 10 ), peak (50%, T 50 ) and conclusion (90%, T 90 ). Across the three rivers, T 10 varied between Julian Day (‘Day’) 94 and 173. Years of earlier T 10 had significantly earlier T 50 , where T 50 varied between Day 105 and 200. The considerable inter-annual variability in migration timings was associated with environmental variables; earlier T 10 and T 50 occurred in years of warmer river temperatures (RTs) and cooler sea surface temperatures (SST), and in years where RTs were higher than SSTs. No environmental variables were significant predictors of T 90 . These results indicate that whilst there is annual variability in the timing of eel migration initiation and peak into freshwaters, this variability is predictable according to differences in environmental conditions. As many of these conditions associated with annual variability in temperature and precipitation then climate change has the potential to shift these migration timings.

Annual cycle

10.1007/s10750-024-05596-1

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Variability in the duration and timing of the estuarine to freshwater transition of critically endangered European eel Anguilla anguilla

Aquatic Sciences (2023)

Rose M. Boardman Adrian C. Pinder Adam T. Piper Catherine Gutmann Roberts Rosalind M. Wright

Abstract The European eel ( Anguilla anguilla L.) is a critically endangered catadromous fish. Their inshore and in-river arrival as glass eel and elvers is an important stage of their life cycle, marking the transition from marine to freshwater habitats. Considerable knowledge gaps remain on the temporal and spatial patterns of this transition period to freshwater residency. Stable isotope (SI) analysis (δ 13 C, δ 15 N) was used to assess the timing and duration of the marine to freshwater transition among glass eels and elvers migrating upstream of the weirs at, or just upstream of, the tidal limit of four English rivers. (Parrett, Frome, Piddle, Chelmer). Variability in SI was low in the Parrett and Frome, resulting in narrow isotopic niches, but was high in the Piddle and Chelmer, resulting in wider niches. The Parrett and Frome data were then used to train a discriminant function analysis (DFA) model to classify eels as ‘marine’, ‘freshwater-established’ and ‘transitioning’. When applied to the Piddle and Chelmer eel SI data, only a small proportion of eels were classified as marine and transitioning, with most being freshwater established. These results suggest that most eels present in the lower reaches rivers have been present for sufficient time for their SI values to represent feeding on local prey resources, with relatively few eels being newly arrived from the marine environment. The transition of eels from marine to freshwater in this species can therefore be prolonged, with many ascending rivers at least one winter after their initial arrival.

Fresh water fish

10.1007/s00027-023-01033-y

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Restoration of river connectivity enables long-distance spawning migrations in a potamodromous fish

Journal of Environmental Management (2025)

Dagmara Błońska Ali Serhan Tarkan Demetra Andreou Jonathan D. Bolland Peter Davies

Rivers across the world are increasingly fragmented due to anthropogenic barriers, with the restoration of connectivity often using fish passes. Fish passes are, however, usually designed for anadromous species, despite ecologically important non-anadromous species being present in the communities impacted by fragmentation. To assess the outcomes for non-anadromous fishes of the installation of multiple fish passes and weir modifications, the movements of the potamodromous European barbel Barbus barbus were evaluated in the lower River Severn basin, western Britain, which was fragmented by six weirs (two on a tributary, four on the Severn mainstem). Movements of individual fish were measured using long-life acoustic transmitters, with stable isotope analysis assisting the assessment of individual variability in movements. The movements of three tagging groups were measured: barbel tagged in 2015 (n = 19; no fish passes/modifications), 2018 (n = 19; tributary weirs modified), and 2020/21 (n = 20; all Severn mainstem weirs fitted with fish passes). No fish in the 2015 group passed the weirs on the Severn mainstem, despite approaches, and only one fish in the 2018 group passed the most downstream weir during high water conditions in winter. Following the opening of all fish passes in early 2021, individuals in the 2020/21 group moved above all the weirs via the fish passes between April and June (the spawning season). These fish then moved upstream for up to 110 km, and some were detected returning downstream. These spawning migrations potentially have high ecological and evolutionary significance, indicating that reconnection schemes designed for anadromous fishes also benefit potamodromous fishes.

10.1016/j.jenvman.2025.124646

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Abundance and biogeography of methanogenic and methanotrophic microorganisms across European streams

Research Square (Research Square) (2019)

Magdalena Nagler Nadine Praeg Georg H. Niedrist Katrin Attermeyer Núria Catalán

Abstract Background: Globally, streams emit significant amounts of methane, a highly potent greenhouse gas. However, little is known about the stream sediment microbial communities that control the net methane balance in these systems, and in particular about their distribution and composition at large spatial scales. This study investigated the diversity and abundance of methanogenic archaea and methane-oxidizing microorganisms across 16 European streams (from northern Spain to northern Sweden and from western Ireland to western Bulgaria) via 16S rRNA gene sequencing and qPCR. Furthermore, it examined environmental factors influencing both abundance and community composition and explored the link to measured potential methane production and oxidation rates of the respective sediments. Results: Our results demonstrated that the methanogenic and methanotrophic microbiomes of the studied European streams were linked to both the temperature and degree of anthropogenic alteration. The microbiomes could be separated into two to three groups according to environmental factors at both stream and catchment scales. Main methanogenic taxa found within more anthropogenically-altered, warm, and oxygen-poor environments were either Methanospirillum spp. or members of the families Methanosarcinaceae and Methanobacteriaceae . Within such environments, methane oxidizing communities were strongly characterized by members of the family Methylobacteriaceae ( Meganema spp. and Microvirga spp.). Contrastingly, communities in colder environments rich in oxygen and with relatively little anthropogenic impact at the catchment scale were characterized by the methanogenic Methanosaetaceae , Methanocellaceae and Methanoregulaceae and the methanotrophic Methyloglobulus spp ., members of the CABC2E06 group (all Methylococcaceae ) and by various Candidatus Methanoperedens. Overall, diversity of methanogenic archaea increased with increasing water temperature. Methane oxidizing communities showed higher diversities in southern sampling sites and in streams with larger stream areas and widths. Potential methane production rates significantly increased with increasing abundance of methanogenic archaea, while potential methane oxidation rates did not show significant correlations with abundances of methane oxidizing bacteria, presumably due to the more diverse physiological capabilities of this group. Conclusions: We present the first large scale overview of the large-scale microbial biogeography of two microbial groups driving the methane cycle dynamics within stream sediments and deduce the impact that future anthropogenic alterations may cause.

10.21203/rs.2.17386/v1

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Citations (1)

Spawning success and population structure of shad (Alosa spp.) in the River Teme, 2015: with supplementary notes on sea lamprey spawning. BUG Report to Natural England.

Adrian C. Pinder Demetra Andreou Emilie A. Hardouin Shib Sankar Sana Phillipa K. Gillingham

Alosa

Petromyzon

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The interplay between total mercury, methylmercury and dissolved organic matter in fluvial systems: A latitudinal study across Europe

Water Research (2018)

Andrea G. Bravo Dolly N. Kothawala Katrin Attermeyer Emmanuel Tessier Pascal Bodmer

Methylmercury

Mercury

10.1016/j.watres.2018.06.064

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Citations (64)

Variability in the summer movements, habitat use and thermal biology of two fish species in a temperate river

Aquatic Sciences (2024)

Fátima Amat-Trigo Ali Serhan Tarkan Demetra Andreou Sadi̇ Aksu Jonathan D. Bolland

Abstract The ability of fish to cope with warm water temperatures in summer depends on factors including their thermal traits and the ability of individuals to access cool-water refugia. Knowledge is highly limited on the in situ responses of many fishes to elevated summer temperatures, including whether they express behavioural thermoregulation. The responses of two riverine species to summer water temperatures were tested here using the movement metrics, spatial habitat use and body temperatures of individual European barbel Barbus barbus (‘barbel’) and common bream Abramis brama (‘bream’) versus river temperatures. Acoustic biotelemetry was applied in the lower River Severn basin, western Britain, in summer 2021 (barbel) and 2022 (bream), where individuals could move across > 150 km of river, including a tributary of cooler water. Across all individuals, bream occupied 37 km of river length (mainstem only), with low inter-individual variability in their spatial habitat use, movements and body temperatures. In contrast, barbel occupied 62 km of river (main river/tributary), with relatively high inter-individual variability in spatial habitat use, movements and body temperatures, with higher variation in body temperatures as river temperatures increased (maximum mean daily temperature difference between individuals on the same day: 4.2 °C). Although warmer individuals generally moved more, their activity was greatest at relatively low temperatures and higher flows, and neither species revealed any evidence of behavioural thermoregulation during elevated temperatures. Enabling phenotypically diverse fish populations to express their natural behaviours and thermal preferences in summer water temperatures thus requires maintaining their free-ranging in thermally heterogenous habitats.

10.1007/s00027-024-01073-y

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Citations (4)