English
norskBlar i forfatter "Figenschou, Lars"
Viser treff 1-14 av 14
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Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2006)Theoretical models predict that subordinate males should have higher sperm velocity to compensate for their disadvantaged mating role and because they experience sperm competition more frequently than dominant males. Differences in mean velocity between sperm of dominants and subordinates in the predicted direction are also documented for a few species, including the Arctic char, Salvelinus alpinus ... -
Genetic and potential non-genetic benefits increase offspring fitness of polyandrous females in non-resource based mating system
(Journal article; Tidsskriftartikkel; Peer reviewed, 2010) -
Har vi forberedt ungdommen på det digitaliserte livet og den nye skolehverdagen?
(Chronicle; Kronikk, 2020-08-16)Det er en nødvendighet at man som oppegående samfunnsborger faktisk er i stand til å skille god informasjon fra dårlig. Innleggsskriverne mener ungdommen trenger praktisk innføring i det å håndtere dagens informasjonsvirkelighet. -
Hatchery selection may depress the number of motile sperm but intensify selection for their swimming velocity in the Arctic charr
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012)The ability of captive breeding programs to maintain genetic diversity and fitness has often been questioned. Recent studies suggest that fitness loss can be extremely rapid in various traits, but it is poorly known how captive breeding affects sperm quality and thus male fertility. We studied the potential effects of hatchery-induced selection on traits indicative of semen quality, in four generations ... -
Hvordan håndterer du forskningsdata?
(Chronicle; Kronikk, 2018-03) -
Like a bridge over troubled water: Økt læring og forståelse av akademia eksemplifisert ved et interaktivt nettmøte mellom universitetet og den nye studenten
(Conference object; Konferansebidrag, 2015-06-18) -
No support for cryptic choice by ovarian fluid in an external fertilizer
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-22)Whether the ovarian fluid (OF) represents a selective environment influencing cryp‐tic female choice was tested using an external fertilizer experiencing intense sperm competition and large effects of OF on sperm swimming behavior—the Arctic charr (<i>Salvelinus alpinus</i>). We physically separated the OF from the eggs of reproductively active females and reintroduced either their ... -
Open Polar – a global open access portal to research on the polar regions
(Conference object; Konferansebidrag, 2021-11)Research activities and research output, in general, have increased, and keep increasing vastly, and so too is research on the polar regions including Svalbard in the Arctic. Major commercial publishers have built subscription-based services which present research literature for a fee. As Open Science and open access to literature and data is gaining momentum, there is a distinct need for powerful ... -
Ph.d.-støtte i biblioteket: Hva, hvorfor, hvordan?
(Conference object; Konferansebidrag, 2017-06-12)En hovedoppgave til fag- og forskningsbiblioteker er å yte lærings- og forskningsstøtte til studenter og ansatte. Ph.d.-studenter befinner seg i det krevende krysningspunktet mellom student og ansatt og trenger derfor støtte av en mer særegen kombinasjon. Ved siden av mer tradisjonelle bibliotektjenester, som litteratursøk og teknisk referansehåndtering, tilbys ph.d.-studentene i økende grad ... -
The relative effect of parasites and social status on sperm traits in Arctic charr
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013)Sperm production and sperm swimming speed, which most likely affect fertilization under sperm competition, are modified by proximate mechanisms. In a comprehensive observational study of free-living and reproductively active Arctic charr (Salvelinus alpinus), we examined the possible modulating effects of male social status (including ornamental development), parasite intensities, and immunity ... -
Reproductive behaviour and sex trait allocations in an external fertilizer – the Charr (Salvelinus alpinus)
(Doctoral thesis; Doktorgradsavhandling, 2010-05-12)This thesis illuminates several aspects of mate choice and sexual selection in a species with external fertilization and no parental care. At a general level we have contributed to the basic framework within evolutionary biology and ecology and at a more specific level, as the proximate mechanisms controlling the associations between immune response, parasite intensities and traits indicative of ... -
Spawning behaviour of Arctic charr (Salvelinus alpinus) : risk of sperm competition and timing of milt release for sneaker and dominant males
(Journal article; Tidsskriftartikkel; Peer reviewed, 2011)A mismatch in timing between the release of male and female gametes in external fertilizers may lead to failed fertilization or, under sperm competition, reduced paternity. To quantify the actual synchrony of gamete release and the level of sperm competition we placed video cameras on two spawning grounds of a naturally spawning population of Arctic charr ( Salvelinus alpinus). Females release eggs ... -
Spawning coloration and sperm quality in a large lake population of Arctic charr (Salmonidae: Salvelinus alpinus L.)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2009)The modern theories of sexual selection predict that male sexual ornaments may have evolved as reliable signals of male fertilization efficiency. However, among the studies of fishes with external fertilization, the results have yielded ambiguous evidence. In the present study, we present data on the phenotypic relationships between red spawning coloration and ejaculate quality (spermatocrit, sperm ... -
Student interaction with online IL content: The impact of exam structure and course design
(Conference object; Konferansebidrag, 2016-10)In 2015, UiT launched a MOOC on information literacy, iKomp (www.ikomp.no). Built on Open EdX, iKomp consists of four modules: learning strategies, information evaluation, information searching, and academic formation. The final exam consists of a 40 question multiple-choice test, originally allowing an unlimited number of attempts and with easily accessible explanations of the questions. An analysis ...
