Search results for "lajit"
showing 10 items of 295 documents
Sublethal Pyrethroid Insecticide Exposure Carries Positive Fitness Effects Over Generations in a Pest Insect
2019
AbstractStress tolerance and adaptation to stress are known to facilitate species invasions. Many invasive species are also pests and insecticides are used to control them, which could shape their overall tolerance to stress. It is well-known that heavy insecticide usage leads to selection of resistant genotypes but less is known about potential effects of mild sublethal insecticide usage. We studied whether stressful, sublethal pyrethroid insecticide exposure has within-generational and/or maternal transgenerational effects on fitness-related traits in the Colorado potato beetle (Leptinotarsa decemlineata) and whether maternal insecticide exposure affects insecticide tolerance of offspring…
COVID-19 Lockdown
2022
Purpose: To investigate differences in athletes’ knowledge, beliefs, and training practices during COVID-19 lockdowns with reference to sport classification and sex. This work extends an initial descriptive evaluation focusing on athlete classification. Methods: Athletes (12,526; 66% male; 142 countries) completed an online survey (May–July 2020) assessing knowledge, beliefs, and practices toward training. Sports were classified as team sports (45%), endurance (20%), power/technical (10%), combat (9%), aquatic (6%), recreational (4%), racquet (3%), precision (2%), parasports (1%), and others (1%). Further analysis by sex was performed. Results: During lockdown, athletes practiced body-weigh…
Coinfection patterns of two marine apicomplexans are not associated with genetic diversity of their polychaete host.
2022
Coinfections of two or more parasites within one host are more of a rule than an exception in nature. Interactions between coinfecting parasites can greatly affect their abundance and prevalence. Characteristics of the host, such as genetic diversity, can also affect the infection dynamics of coinfecting parasites. Here we investigate for the first time the association of coinfection patterns of two marine apicomplexans, Rhytidocystis sp. and Selenidium pygospionis, with the genetic diversity of their host, the polychaete Pygospio elegans, from natural populations. Host genetic diversity was determined with seven microsatellite loci and summarized as allelic richness, inbreeding coefficient…
The roles of foraging environment, host species, and host diet for a generalist pupal parasitoid
2018
Even for parasitoids with a wide host range, not all host species are equally suitable, and host qualityoften depends on the plant the host feeds on. We compared oviposition choice and offspring perfor-mance of a generalist pupal parasitoid,Pteromalus apum(Retzius) (Hymenoptera: Pteromalidae), ontwo congeneric hosts reared on two plant species under field and laboratory conditions. The plantscontain defensive iridoid glycosides that are sequestered by the hosts. Sequestration at the pupal stagediffered little between host species and, although the concentrations of iridoid glycosides in the twoplant species differ, there was no effect of diet on the sequestration by host pupae. The rate of …
Indirect effects of invasive crayfish on native fish parasites
2013
Interactions between invasive and native species are often modified by parasites. One little-studied scenario is that invasive species affect parasite transmission to native hosts by altering the relative abundance of hosts needed in parasite life cycles, for example by predation on these hosts. Here we show that presence of an invasive crayfish species, Pacifastacus leniusculus, decreases the mean abundance of native parasites transmitted from snails and aquatic isopods to perch, Perca fluviatilis, in two large boreal lakes in Finland. In contrast, parasites transmitted to the fish from planktonic copepods or mussels, hosts not readily preyed on by crayfish, were not affected by crayfish p…
Ympäristöuhkia ja tunnistamatonta vierautta
2022
Tutkimme artikkelissamme ekologista ja affektiivista outouttamista suomalais-ruotsalaisessa spekulatiivista fiktiota ja Nordic noiria yhdistävässä televisiosarjassa White Wall (2020). Väitämme, että sarjan affektiivinen kokonaissävy muodostuu spekulatiivisen fiktion ja Nordic noirin lajityypillisten elementtien yhdistyessä, mikä rakentaa outouttavaa katsojakokemusta, jossa fiktiivisen maailman outous yhdistyy tosimaailman ekologisiin kysymyksiin. Tämä affektiivisen ja ekologisen outouttamisen yhdistelmä toimii lähtökohtana sarjan, etenkin sen keskeisen oudon ilmiön, valkoisen seinän, posthumanistiselle luennallemme. Hyödynnämme analyysissämme affektitutkimusta, eri genreteorioita sekä posth…
Täpläravun (Pacifastacus leniusculus) vaikutus Säkylän Pyhäjärven siian poikastuotantoon
2015
Täplärapu (Pacifastacus leniusculus) on vieraslaji, mutta sitä on istutettu paljon suomalaisiin vesistöihin etenkin rapuruton hävittämien jokirapukantojen tilalle. Kalataloudellisesti täpläravun merkitys on nykyään huomattava. Täpläravun vaikutusta kalalajeihin on tutkittu vähän. Säkylän Pyhäjärvellä täplärapukanta on kasvanut nopeasti 2000-luvulla, mutta samalla myös siikapopulaatio on heikentynyt huomattavasti. Tässä tutkimuksessa selvitettiin täpläravun vaikutusta siikapopulaatioon vuosina 1998–2010. Täpläravut voivat käyttää kalojen mätiä ravinnokseen, ja suurissa tiheyksissä ravut saattavatkin saalistuksellaan vaikuttaa negatiivisesti siikojen mädin säilyvyyteen. Kohorttianalyysin avul…
Pre-invasion history and demography shape the genetic variation in the insecticide resistance-related acetylcholinesterase 2 gene in the invasive Col…
2012
Abstract Background Invasive pest species offers a unique opportunity to study the effects of genetic architecture, demography and selection on patterns of genetic variability. Invasive Colorado potato beetle (Leptinotarsa decemlineata) populations have experienced a rapid range expansion and intense selection by insecticides. By comparing native and invasive beetle populations, we studied the origins of organophosphate (OP) resistance-associated mutations in the acetylcholinesterase 2 (AChE2) gene, and the role of selection and demography on its genetic variability. Results Analysis of three Mexican, two US and five European populations yielded a total of 49 haplotypes. Contrary to the exp…
Multidisciplinary and Phenomenonbased Learning in a STEAM Framework
2019
“Some Women Are Born Fighters”: Discursive Constructions of a Fighter’s Identity by Female Finnish Judo Athletes
2017
Martial arts and combat sports have been traditionally associated with masculinity, and a range of contradictory meanings have been attached to women’s engagement and experiences. The present study draws on cultural praxis and feminist poststructuralist frameworks to explore how female martial artists are subjectified to dominant cultural discourses surrounding fighting and competition. Interviews with nine female judoka (judo athletes) were gathered in Finland and analyzed using Foucauldian Discourse Analysis (FDA). The FDA revealed that in female judoka talk, judo was constructed as a sport for all, but also as a male domain and a manly sport with fighting and competition as innate mascul…