Lars Hedenäs

Lars Hedenäs
Swedish Museum of Natural History · Department of Botany

PhD, Docent

About

325
Publications
58,221
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Introduction
Lars Hedenäs currently works at the Department of Botany, Swedish Museum of Natural History. Lars does research in Systematics, Phylogeography and ecology of bryophytes (Taxonomy
Additional affiliations
October 1993 - present
Swedish Museum of Natural History
Position
  • Senior Curator

Publications

Publications (325)
Article
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At the Pingorsuit Glacier in North‐West Greenland, an organic‐rich deposit that had recently emerged from the retreating ice cap was discovered at an elevation of 480 m above sea level. This paper reports on macrofossil analyses of a coarse detritus gyttja and peaty soil, which occurred beneath a thin cover of till and glacifluvial deposits. The se...
Article
Increasing evidence indicates that wide distributed bryophyte taxa with homogeneous morphology may represent separate evolutionary lineages. The evolutionary histories of these cryptic lineages may be related to historical factors, such as the climatic oscillations in the Quaternary. Thus, the post-glacial demographic signatures paired with cryptic...
Article
The geographical distributions of the two cryptic species of the wetland moss Hamatocaulis vernicosus were mapped for western, central and northern Europe, based on identifications of the two by the nuclear ITS1 + 2 and the plastid rpl16 and trnL–trnF. The distributions of the two cryptic species overlap to a large extent. However, in the west and...
Article
Incongruence among morphological and different molecular data sets can be troublesome for species and genus circumscriptions and may cause problems in interpreting intraspecific relationships. Based on the nuclear ITS1 and 2, and the plastid rpl16, trnG and trnL-trnF, it is shown that while such incongruence is not detected if the individual specie...
Article
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New findings of bryophytes are presented
Article
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To understand colonization processes, it is critical to fully assess the role of dispersal in shaping biogeographical patterns at the gene, individual, population, and community levels. We test two alternative hypotheses (H I and H II) for the colonization of disturbed sites by clonal plants, by analyzing intraspecific genetic variation in one and...
Article
Introduction Within the moss genus Timmia, three or four sections have been suggested based on morphology. Earlier studies conflicted in suggesting that T. austriaca Hedw. either displays limited phylogeographical structure or includes large molecular variation with potential for geographical structure. Methods Relationships within Timmia were inf...
Poster
Full-text available
COLE TCH, HILGER HH, GOFFINET B, HEDENÄS L (2021) MOSSFYLOGENI-POSTER - Systematik och egenskaper hos mossor (Bladmossor, Levermossor, Nålfruktmossor)
Article
Amber is renowned for the exceptional preservation state of its inclusions, allowing detailed morphological analysis and providing relevant environmental, palaeoecological, geographical, and geological information. Amber deposits predominantly known from North America, Europe, and Asia, are considered to be rare on the continents that formed Gondwa...
Article
Background and Aims Horizontal Gene Transfer (HGT) is an important evolutionary mechanism because it transfers genetic material that may code for traits or functions, between species or genomes. It is frequent in mitochondrial and nuclear genomes but has not been demonstrated between plastid genomes of different green land plant species. Methods W...
Article
Aim: Mounting evidence suggests that failure of species distribution models to integrate local adaptation hinders our ability to predict distribution ranges, raising the question of whether modelling should be performed at the level of species (clade models) or intraspecific lineages (subclade models), characterized by the restricted availability o...
Article
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Based on studies of the nuclear marker ITS, the plastid ones atpB-rbcL and rpl16, and morphology, five species are recognizable within Scandinavian Plagiopus oederianus. Four of these species are cryptic, whereas the fifth one, Plagiopus alpinus (Schwaegr.) Hedenäs, comb. et stat nov., can be distinguished from the other ones by morphology. Plagiop...
Article
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Hybridization in bryophytes involves a fusion of gametes produced by haploid parental gametophytes of different species. The primary hybrid is thus the short-lived diploid sporophyte, which soon undergoes meiosis prior to the formation of large amounts of haploid spores. We compared morphology of gametophytes (branch leaves) and sporophytes (capsul...
Article
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Lang is gedacht dat aanvoer van zowel ijzerrijk als kalkrijk grondwater in veengebieden zou leiden tot een lage beschikbaarheid van fosfaat, wat goed is in tijden van hoge stikstofdepositie. Een studie in Nederlandse en Zweedse kalkmoerassen (H7230), trilvenen (H7140) en blauwgraslanden (H6410) laat echter zien dat de rol van ijzer en calcium niet...
Article
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Recently, the Society of Vertebrate Paleontology (SVP) has sent around a letter, dated 21st April, 2020 to more than 300 palaeontological journals, signed by the President, Vice President and a former President of the society (Rayfield et al. 2020). The signatories of this letter request significant changes to the common practices in palaeontology....
Article
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Introduction. Following on from work on the European bryophyte Red List, the taxonomically and nomenclaturally updated spreadsheets used for that project have been expanded into a new checklist for the bryophytes of Europe. Methods. A steering group of ten European bryologists was convened, and over the course of a year, the spreadsheets were compa...
Article
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The effects of climatic extremes on Alpine ecosystems, such as in the last glacial period, are poorly understood. The recently discovered Nesseltalgraben site is currently the best dated and most complete high-resolution sedimentary sequence in the northern Alps covering the Marine Isotope Stage (MIS) 3 around 59-28 calibrated kiloyears before pres...
Conference Paper
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The effects of extreme climatic changes on Alpine ecosystems during the last glacial are poorly understood. The recently discovered Nesseltalgraben site in the northern Alps provides a high-resolution sediment sequence covering the Marine Isotope Stage (MIS) 3 (59-28 ka BP), a period characterized by climatic extremes known as Dansgaard-Oeschger cy...
Article
Introduction. Within Racomitrium Sect. Racomitrium, several species are distinguished in the Southern Hemisphere, but only the variable R. lanuginosum (Hedw.) Brid. exists in the north. Plants deviating from the common R. lanuginosum phenotype in leaf orientation and in almost entire or weakly dentate hair-point margins suggest that more than one s...
Article
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Aim To further unravel P availability in mineral-rich fens, and test whether high Fe in the soil would lead to low P availability to the vegetation. Methods Mesotrophic fens were selected over gradients in Ca and Fe in central Sweden and the Netherlands, to study characteristics of vegetation, pore water and peat soil, including inorganic and orga...
Article
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The molecular variation (atpB–rbcL spacer, rpl16 G2 intron, trnGUCC G2 intron) among 50 Scandinavian specimens of Meesia uliginosa s.l. was analysed in the context of three other Meesia species, with Paludella squarrosa as outgroup. The molecular variation within M. uliginosa correlates with morphology, and shows that three species exist: M. uligin...
Article
Sex ratio variation is common among organisms with separate sexes. In bryophytes, sex chromosome segregation at meiosis suggests a balanced progeny sex ratio. However, most bryophyte populations exhibit female-biased phenotypic sex ratios based on the presence of reproductive structures on gametophytes. Many bryophyte populations do not form sexual...
Article
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Background and aims: The mosses Homalothecium lutescens and H. sericeum are genetically, morphologically and ecologically differentiated, mixed populations sometimes occur. In sympatric populations, intermediate character states among gametophytes and sporophytes have been observed, suggesting hybridization and introgression in such populations....
Article
Biodiversity studies and conservation management often neglect fundamental genetic diversity, even if biodiversity loss due to reduction in genetic diversity in declining, relatively common species is probably greater than the loss resulting from disappearing rare species. Climate models suggest that global warming will especially affect high latit...
Article
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This study focusses on the molecular and morphological variation among Scandinavian species within the Syntrichia ruralis complex (S. calcicola, S. norvegica, S. ruraliformis, S. ruralis) of the moss family Pottiaceae, plus the similar-looking S. princeps. Molecular variation was explored based on the internal transcribed spacer 1 (ITS1), and the p...
Book
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This Red List is a summary of the conservation status of the European species of mosses, liverworts and hornworts, collectively known as bryophytes, evaluated according to IUCN’s Guidelines for Application of IUCN Red List Criteria at Regional Level. It provides the first comprehensive, region-wide assessment of bryophytes and it identifies those s...
Book
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The European Red List is a review of the status of European species according to IUCN regional Red Listing guidelines. It identifies those species that are threatened with extinction at the regional level – in order that appropriate conservation action can be taken to improve their status. This publication is a summary of the conservation status of...
Article
During a pre‐site survey and construction of a new metro route and station in Copenhagen, fossiliferous organic‐rich sediments were encountered. This paper reports on multidisciplinary investigations of these organic sediments, which occurred beneath a sediment succession with a lower till, glacifluvial sand and gravel, an upper till and glacifluvi...
Presentation
We present patterns of intra-specific variation in genotypic and phenotypic sex ratios in related to geographic scales and environmental factors in several long-lived bryophytes species with different levels of sexual reproduction. We conclude, that bryophyte sex response is complex, and depends on the species’ life history traits, such as the freq...
Article
Hedenäs, L. & Bisang, I. 2019. Are the remains of the Central European population of Drepanocladus turgescens genetically distinct from Scandinavian populations? – Herzogia 32: 209–218.The wetland moss Drepanocladus turgescens occurs in interglacial refugia in both mountains and lowlands of Europe. It is relatively frequent in Scandinavia, but due...
Article
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In the Baltic area, the long-lived dioicous wetland moss Drepanocladus turgescens (T.Jensen) Broth. produces sporophytes rarely and at irregular intervals. Based on surveys of sporophyte occurrences at 13 sites in two regions in northern Gotland (Sweden) during three to five years, we ask: (1) Is sporophyte formation associated with precipitation a...
Article
In our recent paper on the relationships of 21 European Hypnum taxa we introduced the name Hypnum subcomplanatum Hedenäs, Schlesak & D. Quandt as a new name at the species level, based on the basionym Hypnum cupressiforme var. subjulaceum Molendo (Schlesak et al. 2018). We were aware that H. cupressiforme var. subjulaceum had already been elevated...
Article
Introduction. Three Scorpidium species: S. scorpioides, S. cossonii and S. revolvens are often associated with habitats of high conservation value. This is the first attempt to define the chemical niches for these Scorpidium species in Wales (UK) and allows us to compare these with earlier European datasets. Methods. Water chemistry from sixteen lo...
Article
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Mosses are a highly diverse lineage of land plants, whose diversification, spanning at least 400 million years, remains phylogenetically ambiguous due to the lack of fossils, massive early extinctions, late radiations, limited morphological variation, and conflicting signal among previously used markers. Here, we present phylogenetic reconstruction...
Article
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The pleurocarpous moss genus Hypnum s.l. is a species-rich (> 40 species) cosmopolitan genus, of which 21 taxa occur in Europe. Although several of these species show high morphological resemblance there are strong indications that the genus is highly paraphyletic, which may be masked by convergent morphological evolution. Using molecular informati...
Article
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Molecular phylogenetic analysis found Homalothecium laevisetum, a widespread East Asian and Malesian species, to be unrelated to other species of this genus and invoked resurrection of the genus Oticodium. The latter genus was described for one species, O. celebesiae, which is considered to be a synonym of Homalothecium laevisetum. Oticodium belong...
Article
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Dispersal is a fundamental biological process that can be divided into three phases: release, transportation, and deposition. Determining the mechanisms of diaspore release is of prime importance to understand under which climatic conditions and at which frequency diaspores are released and transported. In mosses, wherein spore dispersal takes plac...
Article
Cryptic species are rarer than their combined, morphologically recognisable species. Each cryptic species may have its own habitat requirements and distribution, and each should be considered separately in biodiversity conservation. This investigation explores how well the two cryptic species of the wetland moss Hamatocaulis vernicosus (Mitt.) Hede...
Article
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Mosses (division Bryophyta) are characterized by the dominance of haploid, poikilohydric gametophytes, and relatively persistent sporophytes that are dependent on the gametophyte generation. Because they are poikilohydric, tend to be desiccation tolerant, and have primarily ectohydric water uptake mechanisms, the ecological requirements of mosses t...
Article
Brown moss-dominated rich fens are characterized by minerotrophic conditions, in which calcium (Ca) and iron (Fe) concentrations show large variations. We examined the relative importance of Ca and Fe in relation to the occurrence of three typical brown moss species: Scorpidium scorpioides, Scorpidium cossonii, and Hamatocaulis vernicosus. Peat che...
Article
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The bryophyte flora of the Sahelian region of sub-Saharan Africa is characterized by a low species richness, but is also extremely poorly documented. We present here the results of a floristic survey in Kedougou (eastern Senegal), which yielded 22 species. Two liverworts and 15 moss species are new to the country, so that the bryophyte flora of Sen...
Article
Fossil tree resins preserve a wide range of animals, plants, fungi and microorganisms in microscopic fidelity. Fossil organisms preserved in an individual piece of amber lived at the same time in Earth history and mostly even in the same habitat, but they were not necessarily parts of the same interacting community. Here, we report on an in situ pr...
Article
Classification of incompletely preserved fossils is a challenging task. We describe a moss fossil preserved in a piece of Miocene Dominican amber and assign it to the monospecific extant genus Helicophyllum. According to the published divergence time estimates, Helicophyllum originated in the Late Cretaceous, but so far no Helicophyllum fossils hav...
Poster
Biased adult sex ratios (SR), usually inferred from counts of sexually mature plants, are commonly observed in unisexual bryophyte species. For sex-expressing bryophytes, there is evidence of spatial variation of reproductive traits, including SRs, related to environmental conditions. However, how sexes in rarely fertile or non-fertile species are...
Article
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The phylogeography and possible origins of the moss Rhytidium rugosum (Hedw.) Kindb. in the European Alps are studied based on information from the nuclear internal transcribed spacers 1 and 2 and a portion of the gene region for glyceraldehyde 3-phosphate dehydrogenase for 364 European specimens. Seventy-three Alps specimens were sampled from W Sw...
Article
One hundred and thirty-nine taxa of mosses are reported from the montane forest zone of southwest Ethiopia. Of these, 53 taxa are new country records and Meteoriopsis reclinata (Müll.Hal.) M.Fleisch. ex Broth. is, in addition, new to Africa. Most of the new records are of species also found in Uganda, Kenya or Tanzania, but there are some surprises...
Article
Studies of interglacial successions are critical to our understanding of the environmental history of an area. Analyses of macrofossil remains of plants and invertebrates from Eemian sediments exposed in a coastal cliff section at Borðoyarvík near Klaksvík, Bordoy, northeastern Faroe Islands, indicate that the sediments accumulated in a coastal lag...
Article
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Scandinavian members of the acrocarpous moss genus Oncophorus were revised after field observations had suggested unrecognized diversity. Based on molecular (nuclear: internal transcribed spacers 1 and 2, ITS; plastid: trnGUCC G2 intron, trnG, rps4 gene + trnS-rps4 spacer, rps4) and morphological evidence, four morphologically distinguishable speci...
Article
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Bryophytes, with their reduced morphologies and challenging taxonomy, appear as ideal candidates for the application of the fast-developing tools of molecular species delimitation. Here, we apply species delimitation techniques to the moss genus Rhynchostegiella, which has long served as a convenient repository for small pleurocarpous species. Spec...
Article
Molecular sequence data provide convincing evidence that Tortella bambergeri (Schimp.) Broth., as understood over the last three decades, consists of two species. On the other hand, a careful investigation of the holotype of Trichostomum bambergeri Schimp. revealed its synonymy with Tortella tortuosa (Hedw.) Limpr. (in its current broad sense), whi...
Article
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Relationships among numerous specimens of Drepanocladus angustifolius (35 specimens), Drepanocladus lycopodioides (71 specimens), and Drepanocladus turgescens (102 specimens) are analysed based on the nuclear internal transcribed spacers 1 and 2 (ITS) and a portion of glyceraldehyde 3-phosphate dehydrogenase (gpd), and the plastid rpl16 G2 intron....
Article
Sexual condition has been employed as a key character within the moss family Thuidiaceae to discriminate the dioicous genera Aequatoriella and Thuidiopsis from the monoicous Pelekium. Here, we implemented phylogenetic analyses of the chloroplast trnL-F region and two unicopy nuclear regions to test the monophyly of Pelekium, and hence, the taxonomi...
Article
Sex ratio variation is commonly observed in natural populations of many organisms with separate sexes and genetic sex determination, including bryophytes. Most bryophyte populations exhibit female-skewed expressed adult sex ratios, generally inferred from counts of sexually mature plants. For the rarely sexually reproducing perennial dioicous moss...
Article
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Paper presents couple of new national and regional bryophyte records accross the world, including Europe, Asia, Africa, Central and South America, Antarctica. In Europe there are interesting findings from Poland (Sphagnum molle, Pseudocalliergon lycopodioides), Hungary (Seligeria acutifolia), Bulgaria and Macedonia (Didymodon icmadophilus), etc. A...
Article
As opposed to angiosperms, moss species richness is similar among tropical regions of the world, in line with the hypothesis that tropical bryophytes are extremely good dispersers. Here, we reconstructed the phylogeny of the pantropical moss genus Pelekium to test the hypothesis that high migration rates erase any difference in species richness amo...
Article
Intraspecific diversity and molecular relations among regional populations were studied for 16 moss species in three European regions, Central Europe, Southern Scandinavia, and Northern Scandinavia, based on internal transcribed spacer and rpl16 G2 intron. The range of nuclear diversity values found is mainly similar to that of other organisms, and...
Article
Sex identification before sexual maturity is notoriously difficult in plants with separate sexes, but is crucial to address many life history related issues. To study the performance of the two sexes in the rarely sexually reproducing dioecious moss Drepanocladus turgescens a molecular sex marker is needed. The female-targeting marker previously de...
Article
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Cambay amber originates from the warmest period of the Eocene, which is also well known for the appearance of early angiosperm-dominated megathermal forests. The humid climate of these forests may have triggered the evolution of epiphytic lineages of bryophytes; however, early Eocene fossils of bryophytes are rare. Here, we present evidence for lej...