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dc.contributor.advisorBluhm, Bodil
dc.contributor.advisorAndreas, Altenburger
dc.contributor.authorDinevik, Hanna
dc.date.accessioned2024-06-27T13:49:37Z
dc.date.available2024-06-27T13:49:37Z
dc.date.issued2024-05-15
dc.description.abstractSpecies inhabiting cold-water environments exhibit typically slower growth and a longer lifespan than warm-water species, implying a slowed ability to recover from natural and anthropogenic disturbances. Longevity estimates for species inhabiting the Arctic region are sparse, despite the ongoing changes and disturbances in the region. Brittle stars (Ophiuroidea) often dominate Arctic shelf epibenthic communities, impacting biogeochemical fluxes and sediment structure. Assessing their resilience to disturbances relies on estimates of their longevity. However, only a handful of studies on brittle star age are available, including three on Arctic species. In this study, I showed that growth bands similar to those seen in the arm bones of other brittle star species were also present in O. borealis specimens from North East Greenland and the Barents Sea. By counting the growth bands using scanning electron microscopy (SEM) and correcting the count for overgrown bands, ages could be estimated in 80 individuals as growth bands are likely formed annually. The maximum age estimated was 39 years, which is the first longevity estimate to be presented for O. borealis. The Specialized von Bertalanffy, the Gompertz and the Single Logistic growth functions were applied to the age data to construct growth curves. The growth constants estimated by each model indicated the growth of O. borealis to be similar to that of other polar brittle stars. These results contribute to information on the longevity of an Arctic benthic invertebrate – which can be applied when estimating impacts of disturbances on the species and, consequently, the Arctic benthic ecosystem.en_US
dc.identifier.urihttps://hdl.handle.net/10037/33962
dc.language.isoengen_US
dc.publisherUiT Norges arktiske universiteten_US
dc.publisherUiT The Arctic University of Norwayen_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2024 The Author(s)
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/4.0en_US
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)en_US
dc.subject.courseIDBIO-3960
dc.subjectLongevityen_US
dc.subjectOphiuroideaen_US
dc.subjectGrowthen_US
dc.subjectOphiopleura borealisen_US
dc.titleAgeing and growth of the Arctic brittle star Ophiopleura borealis (Echinodermata: Ophiuroidea) from the Barents Sea and North East Greenlanden_US
dc.typeMaster thesisen_US
dc.typeMastergradsoppgaveen_US


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Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
Med mindre det står noe annet, er denne innførselens lisens beskrevet som Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)