Browsing NTNU Open by Author "Lee, Aline Magdalena"
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Age-dependent patterns of spatial autocorrelation in fish populations
Marquez, Jonatan; Sæther, Bernt-Erik; Aanes, Sondre; Engen, Steinar; Salthaug, Are; Lee, Aline Magdalena (Journal article; Peer reviewed, 2021)The degree of spatial autocorrelation in population fluctuations increases with dispersal and geographical covariation in the environment, and decreases with strength of density dependence. Because the effects of these ... -
An integrated population model for a long-lived ungulate: more efficient data use with Bayesian methods
Lee, Aline Magdalena; Bjørkvoll, Eirin Marie; Hansen, Brage Bremset; Albon, Steve D.; Stien, Audun; Sæther, Bernt-Erik; Engen, Steinar; Veiberg, Vebjørn; Loe, Leif Egil; Grøtan, Vidar (Journal article, 2015)We develop an integrated population model for Svalbard reindeer Rangifer tarandus platyrhynchus, and demonstrate how this type of model can be used to extract more information from the data and separate different sources ... -
Contrasting effects of summer and winter warming onbody mass explain population dynamics in a food-limitedArctic herbivore
Albon, Steve D.; Irvine, R. Justin; Halvorsen, Odd; Langvatn, Rolf; Loe, Leif Egil; Ropstad, Erik; Veiberg, Vebjørn; van der Wal, René; Bjørkvoll, Eirin Marie; Duff, Elizabeth I.; Hansen, Brage Bremset; Lee, Aline Magdalena; Tveraa, Torkild; Stien, Audun (Journal article; Peer reviewed, 2016)The cumulative effects of climate warming on herbivore vital rates and population dynamics are hard to predict, given that the expected effects differ between seasons. In the Arctic, warmer summers enhance plant growth ... -
Decomposing demographic contributions to the effective population size with moose as a case study
Lee, Aline Magdalena; Svalheim Markussen, Stine; Engen, Steinar; Solberg, Erling Johan; Haanes, Hallvard; Røed, Knut H.; Herfindal, Ivar; Heim, Morten; Sæther, Bernt-Erik (Journal article; Peer reviewed, 2020)Levels of random genetic drift are influenced by demographic factors, such as mating system, sex ratio and age structure. The effective population size (Ne) is a useful measure for quantifying genetic drift. Evaluating ... -
Demographic buffering of life histories? Implications of the choice of measurement scale
Bjørkvoll, Eirin Marie; Lee, Aline Magdalena; Grøtan, Vidar; Sæther, Bernt-Erik; Stien, Audun; Engen, Steinar; Albon, Steve D.; Loe, Leif Egil; Hansen, Brage Bremset (Journal article; Peer reviewed, 2016)Life-history theory predicts that the vital rates that influence population growth the most should be buffered against environmental fluctuations due to selection for reduced variation. However, it remains unclear whether ... -
Demographic consequences of harvesting: a case study from a small and isolated moose population
Herfindal, Ivar; Lee, Aline Magdalena; Hamel, Sandra; Solberg, Erling Johan; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2021)ABSTRACT: Harvesting can have a substantial impact on population dynamics and individual performance in wild populations. While the direct consequences of harvest on individual survival and population growth rate are often ... -
Effects of local density dependence and temperature on the spatial synchrony of marine fish populations
Marquez, Jonatan; Herfindal, Ivar; Sæther, Bernt-Erik; Aanes, Sondre; Salthaug, Are; Lee, Aline Magdalena (Peer reviewed; Journal article, 2023)Disentangling empirically the many processes affecting spatial population synchrony is a challenge in population ecology. Two processes that could have major effects on the spatial synchrony of wild population dynamics are ... -
Environmental effects on spatial population dynamics and synchrony – lessons from northern ecosystems
Herfindal, Ivar; Lee, Aline Magdalena; Marquez, Jonatan; Le Moullec, Mathilde; Peeters, Bart; Hansen, Brage Bremset; Henden, John-André; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2021)Environmental variation in time and space generates complex patterns in the spatial structure of temporally covarying populations. Accounting for spatial population structure is important for sustainable management and ... -
Family planning in the high Arctic: earlier spring onset advances age at first successful reproduction in barnacle geese
Fjelldal, Mari Aas (Master thesis, 2018)I en verden under oppvarming der arter møter nye miljøforandringer er evalueringen av klimaeffekter på individnivå gjennom livshistorie egenskaper viktig for å forstå langtids- utsiktene til naturlige populasjoner. ... -
Generation time and seasonal migration explain variation in spatial population synchrony across European bird species
Martin, Ellen Claire; Hansen, Brage Bremset; Lee, Aline Magdalena; Herfindal, Ivar (Peer reviewed; Journal article, 2023)Spatial population synchrony is common among populations of the same species and is an important predictor of extinction risk. Despite the potential consequences for metapopulation persistence, we still largely lack ... -
Harvesting can stabilise population fluctuations and buffer the impacts of extreme climatic events
Peeters, Bart; Grøtan, Vidar; Gamelon, Marlène; Veiberg, Vebjørn; Lee, Aline Magdalena; Fryxell, John M.; Albon, Steve D.; Sæther, Bernt-Erik; Engen, Steinar; Loe, Leif Egil; Hansen, Brage Bremset (Peer reviewed; Journal article, 2022)Harvesting can magnify the destabilising effects of environmental perturbations on population dynamics and, thereby, increase extinction risk. However, population-dynamic theory predicts that impacts of harvesting depend ... -
Lessons from an extinction : Population dynamics of a population of green rumped parrotlets in decline
Tessem, Eirik Sebastian (Master thesis, 2024)Dagens rate for utdøing er mange ganger høyere enn de normale bakgrunnsrate de siste 10 millioner årene, og populasjonstørrelser rundt om i verden er i ferd med å bli redusert til farlige nivåer. Endret arealbruk antas å ... -
Modelling time to population extinction when individual reproduction is autocorrelated
Lee, Aline Magdalena; Sæther, Bernt-Erik; Markussen, Stine Svalheim; Engen, Steinar (Peer reviewed; Journal article, 2017)In nature, individual reproductive success is seldom independent from year to year, due to factors such as reproductive costs and individual heterogeneity. However, population projection models that incorporate temporal ... -
The Moran effect revisited: spatial population synchrony under global warming
Hansen, Brage Bremset; Grøtan, Vidar; Herfindal, Ivar; Lee, Aline Magdalena (Peer reviewed; Journal article, 2020)The world is spatially autocorrelated. Both abiotic and biotic properties are more similar among neighboring than distant locations, and their temporal co-fluctuations also decrease with distance. P. A. P. Moran realized ... -
More frequent extreme climate events stabilize reindeer population dynamics
Hansen, Brage Bremset; Gamelon, Marlène; Albon, Steve D.; Lee, Aline Magdalena; Stien, Audun; Irvine, Robert Justin; Sæther, Bernt-Erik; Loe, Leif Egil; Ropstad, Erik; Veiberg, Vebjørn; Grøtan, Vidar (Journal article; Peer reviewed, 2019)Extreme climate events often cause population crashes but are difficult to account for in population-dynamic studies. Especially in long-lived animals, density dependence and demography may induce lagged impacts of ... -
The neglected season: Warmer autumns counteract harsher winters and promote population growth in Arctic reindeer
Loe, Leif Egil; Liston, Glen E.; Pigeon, Gabriel; Barker, Kristin; Horvitz, Nir; Stien, Audun; Forchhammer, Mads C.; Getz, Wayne M.; Irvine, Robert Justin; Lee, Aline Magdalena; Movik, Lars K.; Mysterud, Atle; Pedersen, Åshild Ønvik; Reinking, Adele K.; Ropstad, Erik; Trondrud, Liv Monica; Tveraa, Torkild; Veiberg, Vebjørn; Hansen, Brage Bremset; Albon, Steve D. (Peer reviewed; Journal article, 2020)Arctic ungulates are experiencing the most rapid climate warming on Earth. While concerns have been raised that more frequent icing events may cause die-offs, and earlier springs may generate a trophic mismatch in phenology, ... -
No evidence of overall changes in spatial population synchrony across bird species in North America
Karlsen, Simen Christen (Master thesis, 2022)Populasjoner med sterkt korrelerte årlige fluktuasjoner i populasjonsstørrelse, har høy romlig populasjonssynkronitet. Dette øker ofte risikoen for utryddelse hos en art. Romlig autokorrelasjon i miljøstøy (eks. fluktuasjoner ... -
Optimal harvesting in a changing climate
Lee, Aline Magdalena; Sæther, Bernt-Erik (Peer reviewed; Journal article, 2021)Choosing the right harvesting strategy is crucial for sustainable utilization of biological resources but is challenging in real systems with fluctuating environments. This challenge is expected to become even greater with ... -
Population responses to harvesting in fluctuating environments
Lee, Aline Magdalena; jarillo, j; Peeters, Bart; Hansen, Brage Bremset; cao-garcia, francisco; Sæther, Bernt-Erik; Engen, Steinar (Peer reviewed; Journal article, 2021)Achieving sustainable harvesting of natural populations depends on our ability to predict population responses to the combined effects of harvesting and environmental fluctuations while accounting for other internal and ... -
The role of seasonal migration in spatial population synchrony
Martin, Ellen Claire; Hansen, Brage Bremset; Herfindal, Ivar; Lee, Aline Magdalena (Peer reviewed; Journal article, 2023)Spatially synchronized population dynamics are common in nature, and understanding their causes is key for predicting species persistence. A main driver of synchrony between populations of the same species is shared ...