Browsing NTNU Open by Author "Bech, Claus"
Now showing items 21-40 of 46
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Is the rate of metabolic ageing and survival determined by basal metabolic rate in the zebra finch?
Rønning, Bernt; Moe, Børge; Berntsen, Johan Henrik Hårdensson; Noreen, Elin; Bech, Claus (Journal article; Peer reviewed, 2014-09-29)The relationship between energy metabolism and ageing is of great interest because aerobic metabolism is the primary source of reactive oxygen species which is believed to be of major importance in the ageing process. We ... -
Is there plasticity in developmental instability? The effect of daily thermal fluctuations in an ectotherm
Kielland, Øystein Nordeide; Bech, Claus; Einum, Sigurd (Journal article; Peer reviewed, 2017)Diversified bet‐hedging (DBH) by production of within‐genotype phenotypic variance may evolve to maximize fitness in stochastic environments. Bet‐hedging is generally associated with parental effects, but phenotypic variation ... -
Isbjørnens effekt på fugl i et arktisk klima i endring - Sluttrapport for Svalbards miljøvernfond
Moe, Børge; Prop, Jouke; Aars, Jon; Bårdsen, Bård-Jørgen; Hanssen, Sveinn Are; Bech, Claus; Bourgeon, Sophie; Fouw, Jimmy de; Gabrielsen, Geir Wing; Lang, Johannes; Noreen, Elin; Oudman, Thomas; Sittler, Benoit; Stempniewicz, Lech; Tombre, Ingunn; Wolters, Eva (NINA Rapport;1163, Research report, 2015)Arktis blir stadig varmere og utbredelsen av havis blir mindre. Det forandrer leveområdet til de mange artene som er avhengige av havis. Isbjørnen er avhengig av havis for å jakte på sel, og økende lengde på den isfrie ... -
Later at higher latitudes: large-scale variability in seabird breeding timing and synchronicity
Burr, Zofia M.; Varpe, Øystein; Anker-Nilssen, Tycho; Erikstad, Kjell E; Descamps, Sébastien; Barrett, Robert T; Bech, Claus; Christensen-Dalsgaard, Signe; Lorentsen, Svein-Håkon; Moe, Børge; Reiertsen, Tone Kristin; Strøm, Hallvard (Journal article; Peer reviewed, 2016-05-28)In seasonal environments, organisms are expected to optimally schedule reproduction within an annual range of environmental conditions. Latitudinal gradients generate a range of seasonality to which we can expect adaptations ... -
Mercury exposure, stress and prolactin secretion in an Arctic seabird: an experimental study
Tartu, Sabrina; Bustamante, Paco; Angelier, Frédéric; Lendvai, Adam Z.; Moe, Børge; Blévin, Pierre; Bech, Claus; Gabrielsen, Geir W.; Bustnes, Jan Ove; Chastel, Olivier (Peer reviewed; Journal article, 2016)Life-history theory predicts that long-lived organisms should reduce parental effort under inclement environmental conditions in order to favour long-term survival. Seabirds are long-lived top predators often exposed to ... -
Migration and stress during reproduction govern telomere dynamics in a seabird
Schultner, Jannik; Moe, Børge; Chastel, Olivier; Bech, Claus; Kitaysky, Alexander S. (Journal article; Peer reviewed, 2014)Changes in telomere length are believed to reflect changes in physiological state and life expectancy in animals. However, much remains unknown about the determinants of telomere dynamics in wild populations, and specifically ... -
No evidence for thermal transgenerational plasticity in metabolism when minimizing the potential for confounding effects
Kielland, Øystein Nordeide; Bech, Claus; Einum, Sigurd (Journal article; Peer reviewed, 2017)Environmental change may cause phenotypic changes that are inherited across generations through transgenerational plasticity (TGP). If TGP is adaptive, offspring fitness increases with an increasing match between parent ... -
Perfluorinated substances and telomeres in an Arctic seabird: Cross-sectional and longitudinal approaches
Blévin, Pierre; Angelier, Frédéric; Tartu, Sabrina; Bustamante, Paco; Herzke, Dorte; Moe, Børge; Bech, Claus; Gabrielsen, Geir Wing; Bustnes, Jan Ove; Chastel, Olivier (Journal article; Peer reviewed, 2017)Telomeres are non-coding DNA repeats located at the termini of eukaryotic chromosomes, regulated by dynamic processes balancing shortening and maintenance. Despite a mechanism to slow-down telomere shortening, cell division ... -
Persistent organic pollutants and organophosphate esters in feathers and blood plasma of adult kittiwakes (Rissa tridactyla) from Svalbard – associations with body condition and thyroid hormones
Svendsen, Niels Borup; Herzke, Dorte; Harju, Mikael; Bech, Claus; Gabrielsen, Geir W.; Jaspers, Veerle (Journal article; Peer reviewed, 2018)Polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), organochlorine pesticides (OCPs) and organophosphate esters (OPEs) were assessed in blood plasma and feathers of 19 adult black-legged kittiwakes ... -
Physiological plasticity and evolution of thermal performance in zebrafish
Morgan, Rachael (Doctoral theses at NTNU;2020:68, Doctoral thesis, 2020)Climate change is increasing mean and extreme temperatures globally. For aquatic ectotherms, such as fish, increasing temperatures will directly affect their thermalperformance and challenge their upper thermal limits. ... -
Quantitative mismatch between empirical temperature-size rule slopes and predictions based on oxygen limitation
Einum, Sigurd; Bech, Claus; Kielland, Øystein Nordeide (Peer reviewed; Journal article, 2021)In ectotherms, adult body size commonly declines with increasing environmental temperature, a pattern known as the temperature-size rule. One influential hypothesis explaining this observation is that the challenge of ... -
Resource allocation under stress: mechanisms and strategies in a long-lived bird
Schultner, Jannik (Doktoravhandlinger ved NTNU, 1503-8181; 2014:25, Doctoral thesis, 2014)The marine environment is currently undergoing critical modification in the wake of global climate change. Marine animals are, consequently, expected to experience increasing periods of nutritionally stressful conditions. ... -
Short-term effects of data loggers on behaviour and physiology of two species of seabirds: the black-legged kittiwake Rissa tridactyla and the common guillemot Uria aalge
Heggøy, Oddvar (Master thesis, 2013)New technology, such as loggers and transmitters, has the last three decades become an important part of the research on free-living animals. Loggers are very useful in seabird studies. Seabirds often travel considerable ... -
Sources of variation in metabolism of an aquatic ectotherm
Kielland, Øystein Nordeide (Doctoral theses at NTNU;2017:370, Doctoral thesis, 2017)Summary of thesis: An important aspect of ecology is being able to predict and explain how life can adapt to environmental changes. Paramount in making accurate predictions is the disentangling of trait variation, and ... -
State dependence of arousal from torpor in brown long-eared bats (Plecotus auritus)
Sørås, Rune; Fjelldal, Mari Aas; Bech, Claus; van der Kooij, Jeroen; Skåra, Karoline Hansen; Eldegard, Katrine; Stawski, Clare (Peer reviewed; Journal article, 2022)To cope with periods of low food availability and unsuitable environmental conditions (e.g., short photoperiod or challenging weather), many heterothermic mammals can readily go into torpor to save energy. However, torpor ... -
Survival rate and breeding outputs in a high Arctic seabird exposed to legacy persistent organic pollutants and mercury
Goutte, Aurélie; Barbraud, Christophe; Herzke, Dorte; Bustamante, Paco; Angelier, Frédéric; Tartu, Sabrina; Clement-Chastel, Celine; Moe, Børge; Bech, Claus; Gabrielsen, Geir W.; Bustnes, Jan Ove; Chastel, Olivier (Journal article; Peer reviewed, 2015)Chronic exposure to pollutants may represent a threat for wildlife.We tested whether adult survival rate, breeding probability and breeding success the year of sampling and the following year were affected by blood levels ... -
Telomere dynamics and migration patterns in a long-distance migrant, the Arctic skua
Trondrud, Liv Monica (Master thesis, 2017)Telomeres are protective caps at the end of chromosomes that shorten with each cell cycle as well as by oxidative stress. In birds and mammals, telomeres shorten more slowly in long-lived species and, within species, those ... -
Temporal variation in circulating concentrations of organochlorine pollutants in a pelagic seabird breeding in the high arctic
Bustnes, Jan Ove; Bårdsen, Bård-Jørgen; Moe, Børge; Herzke, Dorte; Hanssen, Sveinn Are; Sagerup, Kjetil; Bech, Claus; Nordstad, Tore; Chastel, Olivier; Tartu, Sabrina; Gabrielsen, Geir W. (Journal article; Peer reviewed, 2017)The present study explored short-term temporal variations in circulating concentrations of 3 legacy organochlorines with different physicochemical properties (polychlorinated biphenyl 153 [PCB-153], p,p0-dichlorodiphenyl ... -
Tests of the Marginal Value Theorem in diving bouts of foraging trips in pairs of breeding European shag (Phalacrocorax aristotelis)
Carlsen,Astrid Anette; Wright, Jonathan; Lorentsen, Svein-Håkon; Bech, Claus; Moe, Børge (Master thesis, 2019)I denne avhandlingen ble tilpasninger av Marginal Value Theorem testet ved bruk av data fra 46.103 dykk av 39 par toppskarv (Phalacrocorax aristotelis) innsamlet over 6 år, med hensyn til fuglers respiratorisk fysiologi ... -
The Effect of Long-term Aerobic Exercise and Training Intensity on Blood Pressure in the Elderly
Ingeström, Emma (Master thesis, 2018)The results indicate that aerobic exercise of different training intensities, high-intensity interval training(HIIT) and moderate-intensity continious training (MICT), reduce average blood pressure in the eldery. After 3 ...