Search results for "vaellus"
showing 3 items of 23 documents
Lipid-related thiamine deficiency cause mortality of river lampreys (Lampetra fluviatilis) during pre-spawning fasting
2023
Publisher Copyright: © 2023 The Authors River lampreys (Lampetra fluviatilis) were caught in the fall 2014 on entering the River Perhonjoki for spawning and kept at a hatchery until spawning in late spring 2015 to produce larvae for compensatory stockings. Since the lampreys died massively from early February onwards, they were investigated in March and May to clarify the cause of the deaths. The symptoms in lampreys resembled those of lipid-related thiamine (vitamin B1) deficiency of salmonines, called the M74 syndrome in the Baltic Sea area. Because the lipid content of lampreys was known to be high, thiamine concentrations were analyzed in the liver and ovulated unfertilized eggs, and th…
Japanilaisen Wandervogel-klubin jäsenten käsitykset vaeltamisesta ja vuorista
2012
Instigated by the author’s four-and-a-half month long membership in the Wandervogel hiking club of Kanazawa University, Japan, this study focuses on the experience of hiking in the mountains from a phenomenological perspective. This period of preliminary fieldwork is drawn upon as a source of inspiration and firsthand experience rather than as research material itself, the bulk of which consists of twelve answers given by members of Wandervogel in an unstructured Google Docs questionnaire. Both during and after the lengthy process of translating these answers from Japanese into Finnish, the method of close reading was applied in order to not only uncover their apparent content but to point …
Luontotyypin, maalajin ja maapohjan kaltevuuden vaikutus polkujen kulumiseen Etelä-Konneveden kansallispuistossa
2016
Luonnonympäristöihin suuntautuvan matkailun ja luonnon virkistyskäytön suosio on jatkuvassa kasvussa. Luontomatkailulla on positiivisia vaikutuksia terveydellisesti, sosiaalisesti ja taloudellisesti, mutta kasvaneiden kävijämäärien on todettu muuttavan myös alueen luontoa. Monilla alueilla merkittävin kävijävaikutus on maapohjan kuluminen tallauksen vaikutuksesta. Suomessa suosituimpia luontomatkailukohteita ovat kansallispuistot. Kansallispuistoja hallinnoiva Metsähallitus pyrkii minimoimaan virkistyskäytön luontovaikutuksia muun muassa puistosuunnittelulla. Kun tiedetään maapohjan kulumisherkkyys eri kasvupaikkatyypeissä, uudet retkeilyreitit voidaan sijoittaa tallausta paremmin kestävill…