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Publications (10 of 32) Show all publications
Larsson, J., Lind, E. E., Corell, H., Grahn, M., Smolarz, K. & Lönn, M. (2017). Regional genetic differentiation in the blue mussel from the Baltic Sea area. Estuarine, Coastal and Shelf Science, 195, 98-109
Open this publication in new window or tab >>Regional genetic differentiation in the blue mussel from the Baltic Sea area
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2017 (English)In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 195, p. 98-109Article in journal (Refereed) Published
Abstract [en]

Connectivity plays an important role in shaping the genetic structure and in evolution of local adaptation. In the marine environment barriers to gene flow are in most cases caused by gradients in environmental factors, ocean circulation and/or larval behavior. Despite the long pelagic larval stages, with high potential for dispersal many marine organisms have been shown to have a fine scale genetic structuring. In this study, by using a combination of high-resolution genetic markers, species hybridization data and biophysical modeling we can present a comprehensive picture of the evolutionary landscape for a keystone species in the Baltic Sea, the blue mussel. We identified distinct genetic differentiation between the West Coast, Baltic Proper and Bothnian Sea regions, with lower gene diversity in the Bothnian Sea. Oceanographic connectivity together with salinity and to some extent species identity provides explanations for the genetic differentiation between the West Coast and the Baltic Sea (Baltic Proper and Bothnian Sea). The genetic differentiation between the Baltic Proper and Bothnian Sea cannot be directly explained by oceanographic connectivity, species identity or salinity, while the lower connectivity to the Bothnian Sea may explain the lower gene diversity. © 2016.

Keywords
AFLP, Baltic Sea, Barrier, Gene flow, Oceanographic connectivity, Population genetics
National Category
Environmental Sciences
Research subject
Environmental Studies; Baltic and East European studies
Identifiers
urn:nbn:se:hig:diva-23380 (URN)10.1016/j.ecss.2016.06.016 (DOI)1328/42/2010 (Local ID)1328/42/2010 (Archive number)1328/42/2010 (OAI)
Projects
Evolutionary adaptation to environmental disturbance in marine ecosystems: genetic ecotoxicology in the Baltic Sea
Funder
The Foundation for Baltic and East European Studies, A063-10
Available from: 2016-07-20 Created: 2017-01-27 Last updated: 2019-08-26Bibliographically approved
Mutvei, A., Lönn, M. & Mattsson, J.-E. (2016). Observation not only perception but also cognition. In: Conference proceedings: New perspectives in science education : 5th conference edition : Florence, Italy, 17-18 March 2016. Paper presented at New perspectives in science education, 5th ed, Florence,Italy, March 17-18, 2016. (pp. 365-369). Padova: Libreria Universitaria
Open this publication in new window or tab >>Observation not only perception but also cognition
2016 (English)In: Conference proceedings: New perspectives in science education : 5th conference edition : Florence, Italy, 17-18 March 2016, Padova: Libreria Universitaria , 2016, p. 365-369Conference paper, Published paper (Refereed)
Abstract [en]

According to the Swedish curriculum for primary school it is important in science subjects to develop skills to observe, to describe the observations and to put them into a theoretical framework already starting year 1–3.

Thus, it may be important for the teacher not only to be accustomed to the methods of observing but also to be an expert on using these observations in order to design teaching situations where these skills may be developed.

Here we present a study where 25 pre-service primary school teacher students at the beginning of a 20 weeks course established a relation to a study site focused on ecological questions. The task during the first week of that course was to observe and describe two habitats in the field and suggest what abiotic and biotic factors that had shaped the variation focussing at competition as an important ecological factor. In order to connect those ecological aspects with evolutionary aspects, specimen of the common species in the two habitats were collected and brought to the lab where the students constructed phenetic trees based on morphology but also on ecologically relevant properties like roots/no roots, expecting the set-up to awake evolutionary reflection. A main goal with this week was to give the students tools to investigate nature – to observe and describe patterns and to explain them by observing abiotic and biotic variation and evolutionary features and limitations.

Later during the course we created other, often not obviously similar, situations where the students had the opportunity to use the experiences of this first training week. We used open questions for reflections and examinations in order to get written material to assess the development of the skills.

We found notable personal development in most students and a greater awareness about the importance of personal cognitive activities in order to create better understanding and ability to use achieved knowledge in different situations.

Place, publisher, year, edition, pages
Padova: Libreria Universitaria, 2016
National Category
Learning
Identifiers
urn:nbn:se:hig:diva-23382 (URN)978-88-6292-705-5 (ISBN)
Conference
New perspectives in science education, 5th ed, Florence,Italy, March 17-18, 2016.
Available from: 2017-01-15 Created: 2017-01-27 Last updated: 2018-03-13Bibliographically approved
Larsson, J., Lönn, M., Lind, E. E., Świeżak, J., Smolarz, K. & Grahn, M. (2016). Sewage treatment plant associated genetic differentiation in the blue mussel from the Baltic Sea and Swedish west coast. PeerJ, 4, Article ID e2628.
Open this publication in new window or tab >>Sewage treatment plant associated genetic differentiation in the blue mussel from the Baltic Sea and Swedish west coast
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2016 (English)In: PeerJ, ISSN 2167-8359, E-ISSN 2167-8359, Vol. 4, article id e2628Article in journal (Refereed) Published
Abstract [en]

Human-derived environmental pollutants and nutrients that reach the aquatic environment through sewage effluents, agricultural and industrial processes are constantly contributing to environmental changes that serve as drivers for adaptive responses and evolutionary changes in many taxa. In this study, we examined how two types of point sources of aquatic environmental pollution, harbors and sewage treatment plants, affect gene diversity and genetic differentiation in the blue mussel in the Baltic Sea area and off the Swedish west coast (Skagerrak). Reference sites (REF) were geographically paired with sites from sewage treatments plant (STP) and harbors (HAR) with a nested sampling scheme, and genetic differentiation was evaluated using a high-resolution marker amplified fragment length polymorphism (AFLP). This study showed that genetic composition in the Baltic Sea blue mussel was associated with exposure to sewage treatment plant effluents. In addition, mussel populations from harbors were genetically divergent, in contrast to the sewage treatment plant populations, suggesting that there is an effect of pollution from harbors but that the direction is divergent and site specific, while the pollution effect from sewage treatment plants on the genetic composition of blue mussel populations acts in the same direction in the investigated sites.

National Category
Biological Sciences Environmental Sciences
Research subject
Baltic and East European studies
Identifiers
urn:nbn:se:hig:diva-23381 (URN)10.7717/peerj.2628 (DOI)000387168200015 ()27812424 (PubMedID)2-s2.0-84994409132 (Scopus ID)
Funder
The Foundation for Baltic and East European Studies, A063-10]
Available from: 2016-11-11 Created: 2017-01-27 Last updated: 2018-03-13Bibliographically approved
Prentice, H. C., Li, Y., Lönn, M., Tunlid, A. & Ghatnekar, L. (2015). A horizontally transferred nuclear gene is associated with microhabitat variationin a natural plant population. Proceedings of the Royal Society of London. Biological Sciences, 282(1821), Article ID 20152453.
Open this publication in new window or tab >>A horizontally transferred nuclear gene is associated with microhabitat variationin a natural plant population
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2015 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 282, no 1821, article id 20152453Article in journal (Refereed) Published
Abstract [en]

Horizontal gene transfer involves the non-sexual interspecific transmission of genetic material. Even if they are initially functional, horizontally transferred genes are expected to deteriorate into non-expressed pseudogenes, unless they become adaptively relevant in the recipient organism. However, little is known about the distributions of natural transgenes within wild species or the adaptive significance of natural transgenes within wild populations. Here, we examine the distribution of a natural plant-to-plant nuclear transgene in relation to environmental variation within a wild population. Festuca ovina is polymorphic for an extra (second) expressed copy of the nuclear gene (PgiC) encoding cytosolic phosphoglucose isomerase, with the extra PgiC locus having been acquired horizontally from the distantly related grass genus Poa. We investigated variation at PgiC in samples of F. ovina from a fine-scale, repeating patchwork of grassland microhabitats, replicated within spatially separated sites. Even after accounting for spatial effects, the distributions of F. ovina individuals carrying the additional PgiC locus, and one of the enzyme products encoded by the locus, are significantly associated with fine-scale habitat variation. Our results suggest that the PgiC transgene contributes, together with the unlinked 'native' PgiC locus, to local adaptation to a fine-scale mosaic of edaphic and biotic grassland microhabitats.

National Category
Evolutionary Biology
Identifiers
urn:nbn:se:hig:diva-23383 (URN)10.1098/rspb.2015.2453 (DOI)000368096900028 ()26674953 (PubMedID)
Available from: 2015-12-19 Created: 2017-01-27 Last updated: 2018-03-13Bibliographically approved
Lönn, M., Mutvei, A. & Mattsson, J.-E. (2015). Results and Comparison of Different Complementary Assessment Methods of Science Learning Outcome. In: Conference proceedings. New perspectives in science education, 4th ed.: . Paper presented at New perspectives in science education, 4th ed, Florence, March 20-21, 2015.. Libreriauniversitaria.it
Open this publication in new window or tab >>Results and Comparison of Different Complementary Assessment Methods of Science Learning Outcome
2015 (English)In: Conference proceedings. New perspectives in science education, 4th ed., Libreriauniversitaria.it , 2015Conference paper, Published paper (Refereed)
Abstract [en]

To assess the quality of different aspects of the learning outcomes in relation to knowledge requirements as results of teaching several assessment methods have to be used. For most teachers it is also obvious that students differ in their ability to demonstrate the learning outcome depending on the assessment method used. In order to compare different assessment methods of the learning outcome of pre-school teacher students’ different types of tasks were evaluated and compared in order to identify the potential of each method to give the students fair chances of showing their skills. Thus, assessments based on multiple choice questionnaires of different types, long answer questions, practical laboratory experiments, experiment construction and the students ability to evaluate experiment plans were compared. Having Swedish as mother tongue also was included as an explanatory variable since we suspected that some of the assessment methods in reality rather evaluates the linguistic skills in interpreting texts rather than evaluating the content knowledge of the subject. The results for each student when different methods were used were compared in order to evaluate if some of the methods for assessment gave similar results or if the methods induced differences in the results for the same student. We use ordination techniques to assess and visualize main trends in the data and linear models and classification trees to evaluate specific associations. There is correlation between results from several assessment methods, there are positive correlation between combinations of results from long answers, experiment and experiment construction, meaning students who showed good results with one method did so also with the others - but in some comparisons like long answer questions and multiple choice questions good results were independent of each other. There was a negative effect of having a non-Swedish mother tongue on the results in multiple choice questionnaires, but a positive effect of a non-Swedish mother tongue on the combined scores on experimental construction and experiment. Linear models show that good achievements in experimental construction are explained by high summed scores of Doll´s criteria, the four R’s richness, recursion, relations, and rigor.

Place, publisher, year, edition, pages
Libreriauniversitaria.it, 2015
National Category
Didactics
Identifiers
urn:nbn:se:hig:diva-23387 (URN)978-88-6292-600-3 (ISBN)
Conference
New perspectives in science education, 4th ed, Florence, March 20-21, 2015.
Available from: 2015-09-18 Created: 2017-01-27 Last updated: 2018-03-13Bibliographically approved
Dumanski, J. P., Rasi, C., Lönn, M., Davies, H., Ingelsson, M., Giedraitis, V., . . . Forsberg, L. A. (2015). Smoking is associated with mosaic loss of chromosome Y. Science, 347(6217), 81-83
Open this publication in new window or tab >>Smoking is associated with mosaic loss of chromosome Y
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2015 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 347, no 6217, p. 81-83Article in journal (Refereed) Published
Abstract [en]

Tobacco smoking is a risk factor for numerous disorders, including cancers affecting organs outside the respiratory tract. Epidemiological data suggest that smoking is a greater risk factor for these cancers in males compared to females. This observation, together with the fact that males have a higher incidence of and mortality from most non-sex-specific cancers, remains unexplained. Loss of chromosome Y (LOY) in blood cells is associated with increased risk of nonhematological tumors. We demonstrate here that smoking is associated with LOY in blood cells in three independent cohorts [TwinGene: odds ratio (OR) = 4.3, 95% CI = 2.8-6.7; ULSAM: OR = 2.4, 95% CI = 1.6-3.6; and PIVUS: OR = 3.5, 95% CI = 1.4-8.4] encompassing a total of 6014 men. The data also suggest that smoking has a transient and dose-dependent mutagenic effect on LOY status. The finding that smoking induces LOY thus links a preventable risk factor with the most common acquired human mutation.

National Category
Biological Sciences
Identifiers
urn:nbn:se:hig:diva-23384 (URN)10.1126/science.1262092 (DOI)000347102300053 ()25477213 (PubMedID)
Available from: 2014-12-15 Created: 2017-01-27 Last updated: 2018-03-13Bibliographically approved
Dumanski, J. P., Rasi, C., Lönn, M., Davies, H., Ingelsson, M., Giedraitis, V., . . . Forsberg, L. A. (2015). Smoking is associated with mosaic loss of chromosome Y. Paper presented at 106th Annual Meeting of the American-Association-for-Cancer-Research (AACR), APR 18-22, 2015, Philadelphia, PA. Cancer Research, 75, Article ID 4683.
Open this publication in new window or tab >>Smoking is associated with mosaic loss of chromosome Y
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2015 (English)In: Cancer Research, ISSN 0008-5472, E-ISSN 1538-7445, Vol. 75, article id 4683Article in journal, Meeting abstract (Other academic) Published
National Category
Biological Sciences
Identifiers
urn:nbn:se:hig:diva-23385 (URN)10.1158/1538-7445.AM2015-4683 (DOI)000371597104311 ()
Conference
106th Annual Meeting of the American-Association-for-Cancer-Research (AACR), APR 18-22, 2015, Philadelphia, PA
Available from: 2016-05-02 Created: 2017-01-27 Last updated: 2018-03-13Bibliographically approved
Mattsson, J.-E., Mutvei, A. & Lönn, M. (2015). Students´ Different Strategies in their Development of Knowledge, Understanding, and Skills in Science Education. In: Conference proceedings. New perspectives in science education, 4th ed.: . Paper presented at New perspectives in science education, 4th ed, Florence, March 20-21, 2015.. Libreriauniversitaria.it
Open this publication in new window or tab >>Students´ Different Strategies in their Development of Knowledge, Understanding, and Skills in Science Education
2015 (English)In: Conference proceedings. New perspectives in science education, 4th ed., Libreriauniversitaria.it , 2015Conference paper, Published paper (Refereed)
Abstract [en]

Students differ in their ways of accomplishing varied forms of knowledge, develop personal understanding and improve their skills. Likewise, teachers differ in their way of teaching depending on earlier experiences and training, thus, for teachers it is important understand the different strategies of the students and their own pedagogic profile in order to design learning situations advantageous for all students.

In this study we try to describe the development and the persistence of the learning outcome of five pre-service primary school teacher students and their teachers during one semester of science and technology teaching. The assessment of the students’ fulfilment of the knowledge requirements was made during and shortly after the course, all of them passed. The focus here is to analyse the students and teachers different routes to achieve professional skills and was made eight months after the finished course. The students and the teachers met and discussed their experiences of their development during the course. The discussions in the whole group and in smaller subgroups were recorded and analysed. One area of interest was to describe the personal and professional development during that semester and how this was regarded retrospectively. This may be regarded as an assessment of the pedagogic activities and their relevance for the different students.

Another important objective was to describe the conceptual development of both the students and their teachers and to investigate if there were differences in their development. The development of the conceptual profiles of each person was constructed out of the discussions analysed to reveal developmental changes. The conceptual profiles were regarded to contain three basic zones, externalism, internalism and relational.

A third objective was to investigate the quality of the development out of the criteria of Doll, the four R’s richness, recursion, relations, and rigor and to what extent these criteria were visible in the conceptual development?

On the professional and personal level all participants recognized a development, for the students supported by experiences during practical training at schools. The result also show that type of conceptual development varied between participants but large similarities in the degree of conceptual development of different concepts in one person. Finally, many of the generative phases of conceptual development were correlated to Doll’s criteria of quality in teaching and learning.

Place, publisher, year, edition, pages
Libreriauniversitaria.it, 2015
National Category
Didactics
Identifiers
urn:nbn:se:hig:diva-23386 (URN)978-88-6292-600-3 (ISBN)
Conference
New perspectives in science education, 4th ed, Florence, March 20-21, 2015.
Available from: 2015-09-18 Created: 2017-01-27 Last updated: 2018-03-13Bibliographically approved
Elväng, A., Melik, W., Bertrand, Y., Lönn, M. & Johansson, M. (2011). Sequencing of a Tick-Borne Encephalitis Virus from Ixodes ricinus Reveals a Thermosensitive RNA Switch Significant for Virus Propagation in Ectothermic Arthropods.. Vector Borne and Zoonotic Diseases, 11(6), 649-658
Open this publication in new window or tab >>Sequencing of a Tick-Borne Encephalitis Virus from Ixodes ricinus Reveals a Thermosensitive RNA Switch Significant for Virus Propagation in Ectothermic Arthropods.
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2011 (English)In: Vector Borne and Zoonotic Diseases, ISSN 1530-3667, E-ISSN 1557-7759, Vol. 11, no 6, p. 649-658Article in journal (Refereed) Published
Abstract [en]

Tick-borne encephalitis virus (TBEV) is a flavivirus with major impact on global health. The geographical TBEV distribution is expanding, thus making it pivotal to further characterize the natural virus populations. In this study, we completed the earlier partial sequencing of a TBEV pulled out of a pool of RNA extracted from 115 ticks collected on Torö in the Stockholm archipelago. The total RNA was sufficient for all sequencing of a TBEV genome (Torö-2003), without conventional enrichment procedures such as cell culturing or suckling mice amplification. To our knowledge, this is the first time that the genome of TBEV has been sequenced directly from an arthropod reservoir. The Torö-2003 sequence has been characterized and compared with other TBE viruses. In silico analyses of secondary RNA structures formed by the two untranslated regions revealed a temperature-sensitive structural shift between a closed replicative form and an open AUG accessible form, analogous to a recently described bacterial thermoswitch. Additionally, novel phylogenetic conserved structures were identified in the variable part of the 3'-untranslated region, and their sequence and structure similarity when compared with earlier identified structures suggests an enhancing function on virus replication and translation. We propose that the thermo-switch mechanism may explain the low TBEV prevalence often observed in environmentally sampled ticks. Finally, we were able to detect variations that help in the understanding of virus adaptations to varied environmental temperatures and mammalian hosts through a comparative approach that compares RNA folding dynamics between strains with different mammalian cell passage histories.

National Category
Microbiology in the medical area
Identifiers
urn:nbn:se:hig:diva-23388 (URN)10.1089/vbz.2010.0105 (DOI)000291717500010 ()21254926 (PubMedID)2-s2.0-79959411565 (Scopus ID)
Available from: 2011-02-10 Created: 2017-01-27 Last updated: 2018-03-13Bibliographically approved
Eriksson, S., Skånes, H., Hammer, M. & Lönn, M. (2010). Current distribution of older and deciduous forests as legacies from historical use patterns in a Swedish boreal landscape (1725–2007). Forest Ecology and Management, 260(7), 1095-1103
Open this publication in new window or tab >>Current distribution of older and deciduous forests as legacies from historical use patterns in a Swedish boreal landscape (1725–2007)
2010 (English)In: Forest Ecology and Management, ISSN 0378-1127, E-ISSN 1872-7042, Vol. 260, no 7, p. 1095-1103Article in journal (Refereed) Published
Abstract [en]

We combine historical maps and satellite derived data to reconstruct the development of a Swedish boreal landscape over the past 300 years. The aim is to understand legacies from past use patterns in present-day forest composition and consequences for conservation objectives from a landscape perspective. We analyze landscape development in cross-tabulation matrixes, building change trajectories. These trajectories are tested in linear models to explain the distribution of present-day landscape composition of coniferous, mixed, and deciduous forests >110 years. Of 49 tested change trajectories, 11 showed a significant association. Associations for mixed and coniferous forests were similar and linked to characteristics such as forest continuity, which characterized the studied landscape. Deciduous older forests did not show any association to forest continuity but were more likely to occur on areas that specifically shifted from forests with grazing in the 1720s to open impediment (likely indicating low tree coverage) in the 1850s. There were large shifts and spatial redistribution in ownerships over time. Use patterns and legacies varied between small- and large-scale ownership categories as well as within small-scale categories. The legacies found in the study indicate a complex origin of heterogeneous landscape elements such as older deciduous forests. Additionally, the origin of the legacies indicates a potential need to diversify conservation management based on the influence of past use patterns. Despite large inconsistencies in historical and contemporary data we argue that this type of analysis could be used to further understand the distribution of landscape elements important for conservation objectives.

Keywords
Ownership, Management regime, Heterogeneity, Sustainable forestry, Trajectory, Remnant habitats, Conservation
National Category
Earth and Related Environmental Sciences Social and Economic Geography
Identifiers
urn:nbn:se:hig:diva-23390 (URN)10.1016/j.foreco.2010.06.018 (DOI)000282040000001 ()2-s2.0-77955769490 (Scopus ID)
Available from: 2011-02-23 Created: 2017-01-27 Last updated: 2018-03-13Bibliographically approved
Projects
Environmental Risk Governance of the Baltic Sea (RISKGOV). [A032-2008_OSS]; Södertörn University
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5013-6462

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