Two current members of NRRV, Larry Greenberg and Eva Bergman, and two former members, Johnny Norrgård and Pär Gustafsson, have recently published an overview of 15 years of research on the endemic, large-bodied population of landlocked River Klarälven-Lake Vänern population of Atlantic salmon (Salmo salar).

They highlight the major findings from studies of each of the salmon’s life stages and conclude that the Klarälven salmon population is below carrying capacity. Greenberg et al. (2021) suggest measures to increase the number of spawners and downstream passage success, and they also recommend habitat restoration to compensate for losses from, for example, former log-driving activities. They also discuss the ecological and legislative problems that need to be addressed if one wishes to re-establish salmon in Klarälven’s upper reaches in Norway. Managing, conserving and conducting research on this migratory salmonid population has been challenging not only because of the ecosystems’ large size, but also because there is more than one anthropomorphic stressor involved.

Read more about the paper here: https://cdnsciencepub.com/doi/full/10.1139/cjfas-2020-0163

Seminars Tuesday 9 October 2018

Posted by Karl Filipsson | Events

A threespine stickleback (Gasterosteus aculeatus), a fascinating animal likely to be mentioned in both talks.

On Tuesday October 9, two seminars will be held at the biology department at Karlstad University.

Adaptive potential and evolutionary responses to climate change: Arctic char and threespine stickleback in GreenlandMichael Hansen, Professor, Aarhus University

Ecological genetics – What’s it about and how can we use it? – Karl Filipsson, NRRV PhD-student, Karlstad University

The seminars will be held in room 5F416 and start at 13:15. Everyone who wants to are welcome to attend the seminars.

Typically three spined sticklebacks have several spines in their dorsal and pelvic fins. In the ocean, the spines are important for predator defense in an environment with many large predators and few places to hide. For some landlocked populations the predation pressure can be lower or different (large predator fish may be lacking) and the spines may carry a cost instead of offering protection. In fact, several freshwater populations of sticklebacks in Europe and North America lack the pelvic spines – the result of evolution in a different environment. In the short film Making of the Fittest: Evolution of the Stickleback FishHHMI BioInteractive tells the story of the stickleback evolution and interviews researchers that track the genetic mechanism behind the change. Watch the film here.

stickleback

frog

Moor frog (Rana arvalis), photo by Mumes World.

On Tuesday, May 3, Anssi Laurila, from Uppsala University, will give a seminar titled “How to cope with environmental variation: a frog’s eye view on adaptive solutions”.  

Here, Anssi Laurila describes his own research: “I work at the interface between ecology and evolutionary biology on factors allowing and maintaining phenotypic and genetic variation. Much of my research focuses on the roles of phenotypic plasticity and local adaptation in explaining phenotypic and genetic variation along environmental gradients. Within this theme, I am focusing on both large-scale (latitudinal) and small-scale climatic variation as well as other forms of environmental stress (acidification, disease) in explaining these patterns using amphibians and snails as models.”

The seminar will be given at 13:30 in room 5F416 on Karlstad University. Everyone is welcome to attend!

Seminar: Evolution of host range

Posted by Daniel Nyqvist | Events

On Tuesday, February 16, Sören Nylin from Stockholm University will give a seminar about the evolution of host range.

Read more about Sören Nylin and his research here.

The seminar will be given at 13:30 in room 5F416 on Karlstad University. Everyone is welcome to attend!