A group of international researchers, among which Martin Österling, have a new paper out! The authors, led by Ronaldo Sousa from the University of Minho in Portugal, investigated the role of anthropogenic habitats as refuges for freshwater mussels. The dataset of 709 sites comprised 228 mussel species, of which 34 are threatened, in a broad variety of anthropogenic habitat types. The authors assessed the conservation importance of these anthropogenic habitats, which included both refuges and ecological traps, and provide guidance for the conservation of freshwater mussels. Read the full paper here: https://onlinelibrary.wiley.com/doi/10.1111/gcb.15549

Irrigation canal in Morocco (river Bouhlou) colonized by Margaritifera marocana, one of the rarest species on the planet. Photo by Ronaldo Sousa.

RivEM is looking for a PhD candidate to work on evidence-based control and monitoring of Garden Lupine for the conservation of species-rich road verges. The project is part of a larger commitment of the Swedish EPA, the Swedish Transport Administration and Formas on management and control of invasive organisms. The work will take place in southern Sweden and you will be supervised by Lutz Eckstein, Lovisa Lind Eirell (Biology) as well as Jan Haas and Jan-Olov Andersson (Geomatics).

A species-rich roadside in Sweden (photo taken by Lutz Eckstein).

The main tasks of the successful candidate involve to plan, conduct and analyze field experiments directed at controlling the cover and spread of the invasive Garden Lupine. This will include (i) identifying the optimal timing of management, (ii) evaluating the use of different mowing techniques (timing and the regime) as a controlling agent for the Garden Lupine, and (iii) exploring unconventional control measures on the Garden Lupine and their effects on the native vegetation. Additionally, using data derived from geographic information systems (GIS) and un-crewed aerial vehicles (UAV), the candidate will (iv) develop a method for cost efficient monitoring of lupine populations and for evaluating the success of control measures at the landscape scale. Read more about the position and apply at https://kau.varbi.com/en/what:job/jobID:379605/

Andrew Harbicht, Martin Österling, and Olle Calles from Karlstad University and Anders Nilsson of Lund University have a new paper out. By radio tagging Atlantic salmon smolt and following them along their downstream migration to the Baltic, they quantified the effect of both a dam and a reservoir on migratory rates while accounting for environmental covariates. The good news for salmon, if reservoirs are kept thin (river-like), and mitigative measures are taken at a dam (i.e., spilling water during the smolt migration), the effects of anthropogenic barriers can be dramatically reduced. Read more about the paper here: https://doi.org/10.1002/rra.3760

Hi! My name is Mahboobeh Hajiesmaeili. I joined the RivEM research group for the second time, as a Visiting Research Project Assistant in December 2020. I worked in this research group in the year 2019, too. I have a PhD in River Engineering from Tarbiat Modares University (TMU), Tehran, Iran. My research interests center around the ecological modeling and river habitat assessment for freshwater fish and benthic invertebrates using individual-based/agent-based modelling (IBM/ABM) and bioenergetics approach, as well as physical habitat simulation models. I’m currently the chair of Ecohydraulics committee of the Iranian Hydraulic Association (https://iha.ir/ecohydraulics/).

During my M.Sc. project my main challenge was to introduce and enhance understanding of the multidisciplinary science of “Ecohydraulics” in Iran, which was completely new in my country. I used PHABSIM (Physical HABitat SIMulation) model for my M.Sc. thesis to investigate the effects of flow hydraulic parameters on rainbow trout. This study was one of the first habitat simulation studies about the interaction between ecology and hydraulics in Iran.

As a result of my interest in ecohydraulics and freshwater aquatic ecosystems, I was interested to focus on more developed habitat selection models for my PhD project and I focused on inSTREAM (individual-based Stream Trout Research and Environmental Assessment Model), which is one of the most important individual-based habitat selection models, and one of the main purposes of my research was to modify inSTREAM in its feeding and growth component to include more about how fish feed and how it depends on spatial variation in invertebrates. Given that the primary food sources of brown trout in my study area (Elarm River in Lar National Park, Iran) were benthic invertebrates and also due to the lack of considering these types of feeding organisms and their associated feeding strategy in other bioenergetics models presented so far, development of a new version of inSTREAM by considering hydraulic parameters affecting biomass of benthic invertebrates was the most important innovation of my PhD research. I was so lucky that one of my PhD supervisors was Steve Railsback, who is the main developer of inSTREAM and helped me a lot to improve my knowledge in individual-based modeling.

Starting in the left top corner, clockwise: Elarm River which is a fabulous trout reproduction habitat with plenty of suitable spawning grounds in Lar National Park (Iran); Identified benthic invertebrates in my study site; Collecting benthic invertebrate samples using a Surber sampler in Elarm River); Identifying benthic invertebrates in the laboratory; Me and my field studies team work in my PhD project
Mahboobehs first book, written from the results of both my M.Sc. and Ph.D. studies with collaboration of my PhD supervisor and my M.Sc. thesis advisor (in Persian)

Immediately after receiving my PhD degree, I was successfully accepted by John Piccolo to work in the KK Eflows project within the RivEM-research group at Karlstad University for a short term employment as a visiting researcher. My work was mostly focused on preparing inSTREAM input data using QGIS for Blankaström (Emån) and also downstream part of Gullspång River (Stora and Lilla Åråsforsen).

Mahboobeh and Kristine Lund Bjørnås  (former RivEM Lic-student) in the Day of the Salmon at Fortum in Gullspång, 2019

As a project assistant in our ongoing project I will focus on ecological and individual-based modelling of Atlantic salmon and brown trout habitat using inSTREAM in the lower part of the Gullspång River (Stora and Lilla Åråsforsen) under hyropeaking conditions. I will collaborate with John Piccolo, Johan Watz, and Louis Addo.

One of my favorite activities during my free time is drawing portraits. Considering that my research work is such that I should spend too much time on my computer, drawing and art help me to relax 🙂 

Some of Mahboobehs drawings

Tired of slugs eating fruit and veggies in your garden? Big holes in your strawberries? Johan Watz and Daniel Nyqvist (Politecnico di Torino, Italy) have a new paper out on the performance of copper and waterglass (sodium silicate) barriers against movements of Spanish slugs (Arion vulgaris).

Copper foil barriers delayed, but did not prevent slug passage. Waterglass, on the other hand, prevented passage completely and reduced crop damage in a semi-field validation. You can read the full paper here: https://www.sciencedirect.com/science/article/pii/S0261219420304580

Under 2020–2021 pågår ett projekt inom Energiforsks miljöforskningsprogram som leds av Niclas Carlsson och Olle Calles (laboratorieingenjör resp. docent i biologi). I projektet tittar vi närmare på tiotalet exempel i Sverige där miljöförbättrande åtgärder – kopplat till vattenkraft – utförts i vattendrag.

Frida Sjöborg (masterstudent, KAU) och Niclas Carlsson utför fältinmätningar i ett omlöp i Billstaån. Foto: Jämtkraft

Vi analyserar bland annat funktionsuppföljning för fiskvägar och biotopvårdade sträckor, alltså hur effektiva är de olika fiskvägarna för fiskpassage samt hur lämpliga är de restaurerade biotoperna för vattendragets fiskar. I tillägg till åtgärdernas påverkan på vattendragets ekologiska status analyserar vi kostnader och tekniska aspekter relaterat till åtgärden samt vilka erfarenheter som erhållits under projektens gång.

Projektet ska mynna ut i en exempelsamling där kunskapsläget för de olika åtgärderna i projektet sammanställs. Förhoppningen är att detta projekt kan vara till nytta de kommande åren då många nya åtgärder kommer anläggas enligt den nationella planen för omprövning av vattenkraft. Slutrapport planeras till hösten 2021. Kontakta Niclas (niclas.carlsson@kau.se) för mer information!

Säkerhetslina är att föredra ibland… här vid inmätning i omlöpet vid Finsjö övre, Emån.

Rachel Bowes (RivEM PostDoc) and colleagues have studied the downstream passage of several migrating fish species during spring and fall 2020. Here she writes about their work:

Laxeleratorn at Vattenfall’s Research & Development facility in Älvkarleby

“Dams are like giant road blocks for fish in rivers. It is not always feasible or realistic to remove a dam to restore fish movement throughout rivers, so we need to design detours around them.

When going downstream we call this detour past the dam a bypass. The question we are asking is: How can we design a better bypass for multiple fish species to be able to move downstream past a dam more easily and efficiently? To test this, we are using the Laxeleratorn at Vattenfall’s Research & Development facility in Älvkarleby. We are testing Silver Eels, Salmon, and Roach fish species. Changing the design of the bypass and amount of water flowing through it, we hope to find out what combination creates the optimal bypass for these fish species.”

European eel (Anguilla anguilla)