Sökresultat

Changes in the seasonal timing of life history events are documented effects of climate change. We used a general model to study how dispersal and competitive interactions affect eco-evolutionary responses to changes in the temporal distribution of resources over the season. Specifically, we modeled adaptation of the timing of reproduction and population dynamic responses in two competing populati

We review approaches to predicting carbon and nitrogen allocation in forest models in terms of their underlying assumptions and their resulting strengths and limitations. Empirical and allometric methods are easily developed and computationally efficient, but lack the power of evolution-based approaches to explain and predict multifaceted effects of environmental variability and climate change. In

Evolutionary branching has been suggested as a mechanism to explain ecological speciation processes. Recent studies indicate however that demographic stochasticity and environmental fluctuations may prevent branching through stochastic competitive exclusion. Here we extend previous theory in several ways; we use a more mechanistic ecological model, we incorporate environmental fluctuations in a mo

The evolution of partial migration in birds is typically assumed to be the result of an optimization process. The fitness rewards for individuals choosing to migrate are balanced against the rewards of remaining in the breeding area all year around. This balancing is often thought to result in an evolutionarily stable strategy (ESS) such that an optimal fraction of the population becomes migratory

In migratory birds, arrival date and hatching date are two key phenological markers that have responded to global warming. A body of knowledge exists relating these traits to evolutionary pressures. In this study, we formalize this knowledge into general mathematical assumptions, and use them in an ecoevolutionary model. In contrast to previous models, this study novelty accounts for both traits-a

Phenological changes among plants due to climate change are well documented, but often hard to interpret. In order to assess the adaptive value of observed changes, we study how annual plants with and without growth constraints should optimize their flowering time when productivity and season length changes. We consider growth constraints that depend on the plant's vegetative mass: self-shading, c

Abstract Phenology is an important part of life history that is gaining increased attention because of recent climate change. We use game theory to model phenological adaptation in migratory birds that compete for territories at their breeding grounds. We investigate how the evolutionarily stable strategy (ESS) for the timing of arrival is affected by changes in the onset of spring, the timing of

Long-term phenology monitoring has documented numerous examples of changing flowering dates during the last century. A pivotal question is whether these phenological responses are adaptive or not under directionally changing climatic conditions. We use a classic dynamic growth model for annual plants, based on optimal control theory, to find the fitness-maximizing flowering time, defined as the sw

The role of temporal changes and spatial variability in predation risk and prey's means of mitigating such risks is poorly understood in the context of potential threats of global climate change for migratory birds. Yet nest predation, for example, represents a primary source of reproductive mortality in birds. To assess risk birds must spend time prospecting potential breeding sites for cues or s

Social information is used widely in breeding habitat selection and provides an efficient means for individuals to select habitat, but the population-level consequences of this process are not well explored. At low population densities, efficiencies may be reduced because there are insufficient information providers to cue high-quality habitat. This constitutes what we call an information-mediated

The evolution of natural organisms is ultimately driven by the invasion and possible fixation of mutant alleles. The invasion process is highly stochastic, however, and the probability of success is generally low, even for advantageous alleles. Additionally, all organisms live in a stochastic environment, which may have a large influence on what alleles are favorable, but also contributes to the u

Background: A key innovation may allow one group of species to radiate and replace another, but the role of competition and background extinctions for the replacement process is vigorously debated and unclear. Questions: Is a minimum competitive advantage necessary to initiate replacement? Are background extinctions of the incumbent species necessary? What speciation and extinction dynamics charac

24 september 2026 09:00 till 25 september 2026 17:00 | Konferens Since Lund University Diabetes Centre in Sweden was formed 20 years ago, the centre has been committed to improving the quality of life for people with diabetes. To commemorate the 20th anniversary we invite you to join our celebration in Malmö. Type 1 diabetes and type 2 diabetes are major health challenges for our society. 20 years

https://www.medicin.lu.se/evenemang/lund-university-diabetes-centres-20th-anniversary-symposium - 2026-05-10

Suicide in children and young adults is a leading cause of premature mortality, and there is a need to develop a more profound understanding of the factors that contribute to these deaths. This study is part of the nationwide Retrospective Investigation of Health Care Utilization in Individuals who died by Suicide in Sweden 2015, conducted at Lund University, Sweden. The aim was to examine symptomSuicide in children and young adults is a leading cause of premature mortality, and there is a need to develop a more profound understanding of the factors that contribute to these deaths. This study is part of the nationwide Retrospective Investigation of Health Care Utilization in Individuals who died by Suicide in Sweden 2015, conducted at Lund University, Sweden. The aim was to examine symptom

Brevmall Dnr S2012/158 Postal address Box 213, 221 00 Lund Visiting address Paradisgatan 5 P Telephone switchboard +46 46 222 00 00 Fax +46 222 42 09 Website http://www.psychology.lu.se Department o f Psychology A. PSYP11 Psychology: Theory and Practice of Science in Psychology (TPSP), A1N Second cycle, 15 credits The course was adopted by the Board of the Faculty of Social Sciences 3 May 2012. Th

https://www.psy.lu.se/en/sites/psy.lu.se.en/files/syllabuspsyp11ht13.pdf - 2026-05-10

On the conversion of three North African currencies Torsdag 11 april kl. 13.00-14.00 Myriam Amri (Harvard University) gav en presentation, som följdes av diskussion med William Kutz och frågor från deltagare. PresentationPå det här seminariet kommer Myriam Amri att fokusera på omvandling, handel och kriminalisering av kontanter vid Tunisiens gränser mot Algeriet och Libyen. Först spårar Amri Tunis

https://www.cors.lu.se/tricked-cash - 2026-05-09

TEDDY-föräldrar informerades om barnets ökade risk att drabbas av auatoimmun (typ 1) diabetes när de gick med i studien.Föräldrarnas uppfattning om barnets risk undersöktes sedan vid 3-, 6-, 15- och 27-månadersbesöken.Hos familjer med TEDDY-barn som inte hade någon släkting med autoimmun diabetes, var det vanligt att mammorna underskattade barnets risk att drabbas av sjukdomen (>38%) och ännu vanl

https://www.teddy.lu.se/resultat-fran-teddy/alla-forskningsartiklar/psykologi/hur-val-uppfattar-foraldrarna-teddy-barnens-forhojda-risk-att-drabbas-av-autoimmun-typ-1-diabetes - 2026-05-09

De deltagande familjerna är mycket värdefulla för TEDDY och varje avhopp är en förlust.Med hjälp av nio kriterier identifierades de familjer som var mer sannolika att hoppa av under det första året i TEDDY.Dessa kriterier var: barnet tillhörde en etnisk minoritet, ung mamma, mamman rökte under graviditeten, mamman gick ned i arbetstid eller arbetade inte under graviditeten, mamman avstod helt från

https://www.teddy.lu.se/resultat-fran-teddy/alla-forskningsartiklar/psykologi/kan-man-forebygga-tidigt-avhopp-fran-teddy-2014 - 2026-05-09

C-vitamin påverkar betacellernas funktion. Frågeställningen var om för lite eller för mycket C-vitamin i blodet påverkade risken för TEDDY barnen att få en första autoantikropp mot antingen insulin (IAA) eller GAD (GADA).Ju mer C-vitamin i blodet desto mindre var risken att ett TEDDY barn skulle få IAA, men inte GADA, som första autoantikropp.Mängden C-vitamin i blodet påverkar således risken för

https://www.teddy.lu.se/resultat-fran-teddy/alla-forskningsartiklar/autoantikroppar/har-c-vitamin-i-blodet-betydelse-risken-att-teddy-barn-far-o-cellsautoantikropp-och-sedan-diabetes - 2026-05-09