Search results for "parasitismi"

Männyn (Pinus sylvestris) pihka-ainepitoisuuden vaikutus pilkkumäntypistiäisen (Diprion pini) kykyyn puolustautua loisia ja petoja vastaan

2008

Spore-forming parasites infecting muscles of freshwater fishes : ecology and epidemiology

2017

Fish parasites may potentially harm fisheries and aquaculture. Infected fish are unusable, even though they would not pose a direct risk to human health. The aim of this thesis was to investigate the ecology and epidemiology of three previously unknown or poorly known spore-forming parasites infecting muscles of economically important fish species. The first novel microsporidian species, here described as Microsporidium luciopercae, was found from pike-perch (Sander lucioperca) and European perch (Perca fluviatilis) and formed opaque-looking patches in the muscles. The second novel microsporidian species, Myosporidium spraguei, was found from pike-perch and burbot (Lota lota) and occurred w…

The importance of genetic variation to the risk of Hymenoptera parasitism in bag worm moths (Lepidoptera: Psychidae)

2008

Host-related factors affectingisopod (Asellus aquaticus) susceptibility to and interaction with an acanthocephalan (Acanthocephalus lucii) parasite

2013

Warming temperatures and ectoparasitic sea lice impair internal organs in juvenile Atlantic salmon

2021

As a consequence of climate change and open net-pen salmon farming, wild Atlantic salmon Salmo salar are increasingly likely to encounter elevated temperatures and parasite abundances during their early marine migration. Such stressors can compromise fitness by diminishing liver energy stores and impairing cardiac muscle. To assess whether temperature and infestation by salmon lice Lepeophtheirus salmonis are important correlates of liver energy stores and cardiac muscle performance in juvenile salmon, we experimentally infested fish at 3 abundances of louse infestation (zero, low, and high) and 5 temperatures (10, 13, 16, 19, and 22°C). At the end of the experiment (i.e. when sea lice reac…

Factors contributing to the abundance of the ergasilid copepod, Paraergasilus rylovi, in its freshwater molluscan host, Anodonta piscinalis

2004

FM Mari Saarinen on tutkinut väitöskirjassaan Paraergasilus rylovi -äyriäisloisen biologiaa sen isännässä, Anodonta piscinalis -pikkujärvisimpukassa. Työ on perustavaa laatua oleva, sillä tästä loisesta ei lajinkuvauksen lisäksi ole tiedetty aiemmin mitään.Saarisen tutkimuksissa kartoitetaan äyriäisloisen esiintymistä ja loisinnan voimakkuutta eri simpukkalajeilla eri osissa Suomea. Tulokset osoittivat, että loinen on erikoistunut käyttämään pikkujärvisimpukkaa isäntänään ja että loinen esiintyy Suomessa vain maan eteläosissa. Isännän elinympäristöllä ja koolla havaittiin olevan vaikutusta loisen runsauteen; loinen esiintyi järvissä runsaampana kuin virtaavissa vesissä ja infektion intensit…