A5026961625- Crustacean biology and ecology
- Marine and fisheries research
- Parasite Biology and Host Interactions
- Marine Biology and Ecology Research
- Fish Ecology and Management Studies
- Coral and Marine Ecosystems Studies
- Aquaculture Nutrition and Growth
- Aquatic Invertebrate Ecology and Behavior
- Marine Bivalve and Aquaculture Studies
- Food Waste Reduction and Sustainability
- Economic and Environmental Valuation
- Invertebrate Immune Response Mechanisms
- Marine Ecology and Invasive Species
- Environmental DNA in Biodiversity Studies
- Animal Behavior and Reproduction
- Genetic diversity and population structure
- Plant and animal studies
- Mosquito-borne diseases and control
- Animal Ecology and Behavior Studies
- Avian ecology and behavior
- Species Distribution and Climate Change
- Marine and coastal plant biology
- Animal Behavior and Welfare Studies
- Sustainable Agricultural Systems Analysis
- Scientific Computing and Data Management
Swedish University of Agricultural Sciences
2013-2022
Swedish National Board of Fisheries
2002-2011
University of Oslo
2011
Norwegian Veterinary Institute
2011
University of Leicester
1998
Stockholm University
1989
Globally, Invasive Alien Species (IAS) are considered to be one of the major threats native biodiversity, with World Conservation Union (IUCN) citing their impacts as 'immense, insidious, and usually irreversible'.It is estimated that 11% c. 12,000 alien species in Europe invasive, causing environmental, economic social damage; it reasonable expect rate biological invasions into will increase coming years.In order assess current position regarding IAS determine issues were deemed most...
Rates of biodiversity loss are higher in freshwater ecosystems than most terrestrial or marine ecosystems, making conservation a priority. However, prioritization methods impeded by insufficient knowledge on the distribution and status taxa, particularly invertebrates. We evaluated extinction risk world's 590 crayfish species using IUCN Categories Criteria found 32% all threatened with extinction. The level differed between families, proportionally more Parastacidae Astacidae Cambaridae....
The threat posed by invasive non-native species worldwide requires a global approach to identify which introduced are likely pose an elevated risk of impact native and ecosystems. To inform policy, stakeholders management decisions on threats aquatic ecosystems, 195 assessors representing 120 assessment areas across all six inhabited continents screened 819 from 15 groups organisms (freshwater, brackish, marine plants animals) using the Aquatic Species Invasiveness Screening Kit. This...
Abstract: Native European freshwater crayfish (Astacida, Decapoda) are under severe pressure from habitat alteration, the introduction of nonindigenous species, and epizootic disease. Crayfish plague, an acute disease caused by fungus‐like agent Aphanomyces astaci , was introduced into Europe in mid‐nineteenth century is responsible for ongoing widespread mortality native populations. We reviewed recent developments current practices field pathology. The severity plague has resulted...
Summary The oomycete A phanomyces astaci is generally considered a parasite specific to freshwater crayfish, and it has become known as the crayfish plague pathogen. Old experimental work that reported transmission of C hinese mitten crab E riocheir sinensis , ability . grow in non‐decapod crustaceans, never been tested properly. We re‐evaluated host range by screening for presence two species cohabiting with infected fresh waters, well other higher crustaceans from such localities. animals...
Native European crayfish conservation was triggered by invasion of plague disease agent, Aphanomyces astaci , starting 1860s in Northern Italy. Resulting epidemics quickly spread over Continental Europe, then to Finland, Sweden and finally, after running amok around A. discovered also Iberian Peninsula, Norway, Ireland, United Kingdom 1970s 1980s. By that time significant proportion native stocks had been lost, while were still recorded, industrialization waterways construction causing...
Summary Indigenous European freshwater crayfish ( ICS ) are threatened due to invasive North American that natural carriers of A phanomyces astaci which causes plague. Infectious . zoospores released from carrier crayfish, but little is known about the spore abundance in water systems either host non‐indigenous species NICS or experience plague outbreaks. We tested two large‐scale filtering approaches generate new insight and dynamics spores systems. Depth filtration DF dead‐end...
1. In ecological studies on freshwater crayfish, determination of basic population parameters is often complicated by the lack a suitable age estimation method. 2. Previously, lipofuscin pigment in olfactory lobe cell masses (OLCM) short‐lived tropical crayfish has been used for accurate determination. Here we present first test this method longer‐lived, temperate species, signal Pacifastacus leniusculus . 3. Confocal fluorescence microscopy and image analysis histological sections were to...
Since 1907, coinciding with the arrival of crayfish plague, noble (Astacus astacus) has steadily declined in Sweden. To substitute fishery lost, mainly due to and since species is highly susceptible disease, Swedish government started a large-scale introduction American signal (Pacifastacus leniusculus) end 1960's. The chronic carrier plague (Aphanomyces astaci), it likely that this had an effect on spread disease remaining populations. 6,961 outbreaks were recorded between years 1907-2004....
Invasive crayfish have attracted much attention by scientists and policy makers in Europe, partly due to their ability transmit diseases native species. In December 2012, 13 specimens of a new species were found the River Marstaan central Sweden. Mitochondrial DNA analyses identified them as Marmorkrebs Procambarus fallax f. virginalis. It is not known if can establish reproducing populations Sweden, knowledge how different stressors negatively affect eventual reproduction lacking. Since...
Noble crayfish Astacus astacus is threatened in Europe due to invasive carrying the plague agent Aphanomyces astaci. Norway among last countries which introduction of non-indigenous has been limited through strict legislation practices. However, North American signal Pacifastacus leniusculus were recently discovered a water-course that repeatedly hit by plague. We mapped distribution and relative density (catch per unit effort) within this lake, performed agent-specific real-time PCR...
We describe a novel syndrome in crayfish, eroded swimmeret (ESS), affecting wild female signal crayfish Pacifastacus leniusculus. ESS causes partial or total erosion. observed only larger than 40 mm carapace length, i.e. sexually mature and probably having carried eggs at least once. The swimmerets were melanised, indicating immune system response. isolated Fusarium tricinctum species complex (SC), F. sambucinum SC, Saprolegnia parasitica S. australis from the melanised tissue of swimmerets....
Signal crayfish, as an invasive alien species in Europe, have caused impacts on aquatic communities and losses of native crayfish. Eradication recently established populations may be possible small ponds (<2.5 ha) short lengths watercourses using a nonselective biocide. Between 2004 2012, total 13 sites the U.K. were assessed for suitability. Six treated with natural pyrethrum crayfish successfully eradicated from three. In Norway, five two synthetic pyrethroid, cypermethrin, both...
The Swedish market for freshwater crayfish is attractive since a high price paid the crayfish. Before 1997 import of live was regulated and required application, permit, veterinary border control approved boiling places. In august four paragraphs were removed from legislation, resulting in an almost open to import, regardless species or country origin. This seriously increased threat work conserving native noble crayfish, with possibility new diseases entering country. An account will be...
The Internal Transcribed Spacer (ITS) region of the nuclear ribosomal repeat was investigated in search for a suitable genetic marker population studies noble crayfish Astacus astacus (L.). DNA sequencing revealed presence two microsatellite insertions ITS1. By designing highly specific PCR primers, adjacent to one insertions, we were able use fragment analysis explore variation insertion 642 specimens from 17 populations Sweden and former Yugoslavia. A new statistical test, Population...
Summary 1. The signal crayfish Pacifastacus leniusculus is an invasive species in Sweden, threatening the red‐listed nobel Astacus astacus through spreading plague. Time‐to‐event models can handle censored data on such introduced populations for which state (successful or not) only partially known at last observation, but even though most often are censored, this type of model usually not used likelihood‐based inference and predictions dynamics establishing populations. 2. We specified...
Abstract We conducted a seven-year survey (years 2009 - 2015) of the Lake Saimaa signal crayfish population. is largest single waterbody in Finland, with productive fishery and crayfishery. The were introduced to mid-1990’s commercial was initiated mid-2000s. At first, there small proportion noble among catch, but after 2007, an acute plague epidemic eradicated them, stock started showing frequent gross symptoms chronic infection (e.g., melanised lesions, eroded uropods pleopods, lost...