Blar i Institutt for biologi på tittel
Viser treff 1326-1345 av 2521
-
Langtidseffekter av ulik fôrkvalitet på kroppssammensetning og overlevelse hos sebrafink (Taeniopygia guttata)
(Master thesis, 2010)Et individs utvikling påvirkes av mange ytre og indre faktorer, og betydningen av slike faktorer er størst tidlig i livet. Hos fugler skjer det meste av vekst og utvikling i løpet av de første leveukene, og påvirkning som ... -
Large hawk-cuckoo Hierococcyx sparveroides parasitism on the Chinese babax Babax lanceolatus may be an evolutionary recent host-parasite system
(Journal article; Peer reviewed, 2012)We documented brood parasitism by the poorly studied Large Hawk-Cuckoo on a previously unknown host species, the Chinese Babax. Furthermore, we describe a new egg colour for the Large Hawk-Cuckoo. The parasitism rate of ... -
Large Scale Geographical Mapping of Essential Oil Volatiles in Heracleum (Apiaceae): Identification of Novel Compounds and Unraveling Cryptic Variation
(Journal article; Peer reviewed, 2018)Conspecific populations of plants in their native range are expected to show considerable variation due to long‐term ecological and evolutionary factors. We investigated the levels of secondary metabolites in Heracleum ... -
Large-effect loci mediate rapid adaptation of salmon body size after river regulation
(Peer reviewed; Journal article, 2022)Understanding the potential of natural populations to adapt to altered environments is becoming increasingly relevant in evolutionary research. Currently, our understanding of adaptation to human alteration of the environment ... -
Large-scale spatiotemporal variation in road mortality of moose: Is it all about population density?
(Journal article; Peer reviewed, 2011)Ungulate‐vehicle collisions (UVC) constitute a widespread and increasing problem in large parts of the world. This has generated an intensive search for mitigating measures, but often based on a weak understanding of the ... -
Later at higher latitudes: large-scale variability in seabird breeding timing and synchronicity
(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 ... -
Lead concentrations in blood from incubating common eiders (Somateria mollissima) in the Baltic Sea.
(Journal article; Peer reviewed, 2020)Here we investigate if lead may be a contributing factor to the observed population decline in a Baltic colony of incubating eiders (Somateria mollissima). Body mass and blood samples were obtained from 50 incubating female ... -
Lead isotopic signatures in blood from incubating common eiders (Somateria mollissima) in the central Baltic Sea
(Peer reviewed; Journal article, 2020)The Christiansø colony of common eiders (Somateria mollissima) in the central Baltic Sea were exposed to high levels of Pb during the 2018 breeding season that were not present in 2017. Due to these high Pb blood levels, ... -
Leads in Arctic pack ice enable early phytoplankton blooms below snow-covered sea ice
(Journal article; Peer reviewed, 2017)The Arctic icescape is rapidly transforming from a thicker multiyear ice cover to a thinner and largely seasonal first-year ice cover with significant consequences for Arctic primary production. One critical challenge is ... -
Leaf it to the professionals: Branching out to restore deciduous forests in southern Norway.
(Master thesis, 2023)While restoration endeavors in Scandinavia and Northern Europe have predominantly concentrated on boreal forests, the often-overlooked boreonemoral forests, sharing similar characteristics, demand equal attention. These ... -
Legacy and emerging organohalogenated compounds in feathers of Eurasian eagle-owls (Bubo bubo) in Norway: Spatiotemporal variations and associations with dietary proxies (δ13C and δ15N)
(Peer reviewed; Journal article, 2021)The occurrence of organohalogenated compounds (OHCs) in wildlife has received considerable attention over the last decades. Among the matrices used for OHCs biomonitoring, feathers are particularly useful as they can be ... -
Legacy and emerging per- and polyfluorinated alkyl substances (PFASs) in sediment and edible fish from the Eastern Red Sea
(Journal article; Peer reviewed, 2021) -
Levels and Effects of Organohalogenated Contaminants on Thyroid Hormone Levels in Glaucous Gulls (Larus hyperboreus) from Kongsfjorden, Svalbard.
(Master thesis, 2011)The glaucous gull (Larus hyperboreus) is one of the largest flying top predators in the Arctic and is exposed to rather high levels of different persistent organohalogenated contaminants (OHCs). The present study investigated ... -
Levels and Effects of Organohalogens on Corticosterone Hormones in glaucous gulls (Larus hyperboreus) from Kongsfjorden, Svalbard
(Master thesis, 2014)Long-range atmospheric transport, ocean currents, sea ice and rivers are transporting environmental contaminants into the Arctic. Some of these contaminants can reach high concentrations in the upper trophic levels in the ... -
Levels and effects of persistent organic pollutants (POPs) in seabirds. Retinoids and a-tocopherol - potential biomarkers of POPs in birds?
(Doktoravhandlinger ved NTNU, 1503-8181; 2006:6, Doctoral thesis, 2006)In the present thesis, levels of polychlorinated biphenyls (PCBs), some chosen organochlorine pesticides (OCPs), polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecane (HBCD) were analyzed by gas chromatography ... -
Levels and effects of persistent organic pollutants (POPs) on circulating thyroid hormones in house sparrows (Passer domesticus) from Leka, Norway
(Master thesis, 2014)Persistent organic pollutants (POPs) have been reported to disrupt vertebrate endocrine systems in numerous wildlife, semi-field and laboratory studies, and thyroid homeostasis is among the systems reported to be susceptible ... -
Levels and endocrine disruptive effects of legacy POPs and their metabolites in long-finned pilot whales of the Faroe Islands
(Doctoral theses at NTNU;2017:279, Doctoral thesis, 2017)Pilot whales (Globicephala melas) in the Northeastern part of the Atlantic Ocean have high body concentrations of persistent organic pollutants (POPs), such as polychlorinated biphenyls (PCBs), organochlorinated pesticides ... -
Levels and Potential Effects of PCBs, OH-PCBs, OH-PBDEs, and Hg on Plasma Progesterone Levels in Breeding Glaucous Gulls (Larus hyperboreus) from Kongsfjorden, Svalbard
(Master thesis, 2016)Arctic life faces the risk of exposure to a magnitude of anthropogenic pollutants. Due to the chemical stability and persistence of many organic pollutants, they are able to undergo long-range transportation from emission ... -
Levels and Potential Genotoxic Effects of Organohalogenated Contaminants in Seabird Eggs from Svalbard
(Master thesis, 2018)Organohalogenated contaminants (OHCs) have been detected in relative high levels in arctic seabirds and eggs and are of great concern due to their potential toxic effects. OHCs are incorporated into the eggs during egg ...