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  • 1. Alonso, Marta
    et al.
    Jiménez, Juan A.
    Nylinder, Stephan
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Cano, Maria J.
    Disentangling generic limits in Chionoloma, Oxystegus, Pachyneuropsis and Pseudosymblepharis (Bryophyta: Pottiaceae): An inquiry into their phylogenetic relationships2016In: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 65, p. 3-18Article in journal (Refereed)
  • 2.
    Bisang, Irene
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Ehrlén, Johan
    Korpelainen, Helena
    University of Helsinki.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    No evidence of sexual niche partitioning in a dioecious moss with raresexual reproduction2015In: Annals of Botany, ISSN 0305-7364, E-ISSN 1095-8290Article in journal (Refereed)
    Abstract [en]

    Background and Aims. Roughly half of the species of bryophytes have separate sexes (dioecious) and half are hermaphroditic (monoecious). This variation has major consequences for the ecology and evolution of the different species. In some sexually reproducing dioecious bryophytes, sex ratio has been shown to vary with environmental conditions. This study focuses on the dioecious wetland moss Drepanocladus trifarius, which rarely produces sexual branches or sporophytes and lacks apparent secondary sex characteristics, and examines whether genetic sexes exhibit different habitat preferences, i.e. whether sexual niche partitioning occurs.

    Methods. A total of 277 shoots of D. trifarius were randomly sampled at 214 locations and 12 environmental factors were quantified at each site. Sex was assigned to the individual shoots collected in the natural environments, regardless of their reproductive status, using a specifically designed molecular marker associated with female sex.

    Key Results. Male and female shoots did not differ in shoot biomass, the sexes were randomly distributed with respect to each other, and environmental conditions at male and female sampling locations did not differ. Collectively, this demonstrates a lack of sexual niche segregation. Adult genetic sex ratio was female-biased, with 28 females for every male individual.

    Conclusions. The results show that although the sexes of D. trifarius did not differ with regard to annual growth, spatial distribution or habitat requirements, the genetic sex ratio as nevertheless significantly female-biased. This supports the notion that factors other than sex-related differences in reproductive costs and sexual dimorphism can also drive the evolution of biased sex ratios in plants

  • 3.
    Bisang, Irene
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Ehrlén, Johan
    Persson, Christin
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Family affiliation, sexratio and sporophyte frequency in unisexual mosses2014In: Botanical journal of the Linnean Society, ISSN 0024-4074, E-ISSN 1095-8339, Vol. 174, p. 163-172Article in journal (Refereed)
    Abstract [en]

    Patterns of sex expression and sex ratios are key features of the life histories of organisms. Bryophytes are the only haploid-dominant land plants. In contrast with seed plants, more than half of bryophyte species are dioecious, with rare sexual expression and sporophyte formation and a commonly female-biased sex ratio. We asked whether variation in sex expression, sex ratio and sporophyte frequency in ten dioecious pleurocarpous wetland mosses of two different families was best explained by assuming that character states  evolved: (1) in ancestors within the respective families or (2) at the species level as a response to recent habitat conditions. Lasso regression shrinkage identified relationships between family membership and sex ratio and sporophyte frequency, whereas environmental conditions were not correlated with any investigated reproductive trait. Sex ratio and sporophyte frequency were correlated with each other. Our results suggest that ancestry is more important than the current environment in explaining reproductive patterns at and above the species level in the studied wetland mosses, and that mechanisms controlling sex ratio and sporophyte frequency are phylogenetically conserved. Obviously, ancestry should be considered in the study of reproductive character state variation in plants.

  • 4.
    Bisang, Irene
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Infraspecific sex ratio variation and its predictors in mosses – the case of the wetland moss Drepanocladus lycopodioides2015In: Botany 2015. Science and Plants for People. Abstracts. / [ed] Anonymous, 2015Conference paper (Other academic)
    Abstract [en]

    Sex ratio variation is a common but unexplained phenomenon of many species with chromosomal sex determination, including many bryophytes. Expressed sex ratio variation could be related to environmental conditions in a few mosses investigated to date. However, many bryophyte populations are non-fertile during their entire life cycle and intraspecific genetic sex ratio variation remains highly unexplored in natural populations. Drepanocladus lycopodioides, a pleurocarpous wetland moss with a distribution largely confined to Western Eurasia, rarely to occasionally forms sexual organs. It belongs to the majority of bryophytes that exhibits a female bias in expressed sex ratio. We applied a novel approach to sex individual shoots irrespective of their reproductive state using a specifically designed female-targeting molecular marker. We demonstrated that the bias in sex expression corresponds to a genetic female bias in the European adult population. Here, we investigated three regional populations of D. lycopodioides in its core distribution area. We asked whether haplotype diversity (H), sex expression (SE), genetic sex ratios, and sporophyte frequency varied within and among regions, whether these characteristics were related with each other, and / or to environmental parameters. Levels of H differed among regions and were positively related to habitat patch size. H was unequally partitioned between the sexes and was associated with estimated regional sporophyte frequency. Recorded plot-wise sporophyte frequency was generally very low in all regions. Overall genetic sex ratio was female-biased in all regions. Sex expression and genetic sex ratio varied strongly within regions (SE 0 –75%), with 27% of the plots lacking sex organs and 78% of the plots one-sexed, but differences among regions were non-significant. While no sex expression occurred in habitats deeper than 25cm, genetic sex ratio was not related to the measured environmental parameters.

  • 5.
    Bisang, Irene
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Males Are Not Shy in the Wetland Moss Drepanocladus lycopodioides2013In: International journal of plant sciences, ISSN 1058-5893, E-ISSN 1537-5315, Vol. 174, no 5, p. 733-739Article in journal (Refereed)
    Abstract [en]

    Premise of research. Maintenance of dioecious and monoecious sexual systems at nearly equal frequencies, infrequent sexual expression, and distinctly female-skewed sex ratios among the dioecious species are reproductive characteristics of bryophytes, which are otherwise unusual among embryophytes. Most sex ratio assessments to date have relied on gametophytes forming sexual organs, and how these reflect genetic genders is largely unresolved.

    Methodology. For the European wetland moss Drepanocladus lycopodioides, we ask whether the adult expressed sex ratio is more strongly female biased than the “true” population sex ratio based on genetically male and female plants, i.e., whether males exhibit a lower sex expression rate than females (shy males). We assess expressed sex ratio on the basis of sex expression in individually scored herbarium specimens. We directly and on a large geographic scale assess nonexpressed sex ratio, for the second time in a moss, by sexing individual shoots from nonexpressing specimens using a molecular sex marker.

    Pivotal results. On the basis of the female and male frequencies in these two data sets and the overall proportion of expressing specimens, we estimate the European population sex ratio as 2.6 : 1 (female to male). All three sex ratios are significantly female skewed and do not significantly differ from each other, indicating that there is no gender difference in sex expression rates.

    Conclusions. These results and previous data for Drepanocladus trifarius show that males are not shy in the two wetland mosses of markedly different habitats.

  • 6.
    Bisang, Irene
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Mass occurrence of springtails on a moss cushion – what are they doing?2015In: Melting Pot, Swedish Museum of Natural History, Abstracts: https://vega.nrm.se/vanstermenyn/forskningochsamlingar/meltingpot/2015.9654.html, 2015Conference paper (Other academic)
    Abstract [en]

    The motile spermatozoids of bryophytes can swim up to a few centimetres. They require free water to fertilize the egg of the female organs, which sit on plants separate from the males in more than 50% of the species. When the sex organs are produced on different plants, this presents a serious obstacle to successful fertilization. The problems are overcome by a variety of mechanisms. Some of the more spectacular include spermatozoid transport up to at least several decimetres by water movement, by water drops spread from splash-cups surrounding the male organs up to two meters, by ejection up to15 centimetres into the air, or by having dwarf males that grow directly on the female plants. Here we report on another special kind of spermatozoid transfer that we came across during fieldwork in 2014, namely by micro-arthropods. Bryophyte fertilization mediated by animals was suggested more than a century ago, and was recently shown to occur in experimental settings. However, our observation is likely one of the first made directly in nature.

     

     

  • 7.
    Bisang, Irene
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Mass-occurrence of springtails on Tortula cernua: A field-observation ofpossible animal-mediated fertilization2015In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 37Article in journal (Refereed)
  • 8.
    Bisang, Irene
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Sammelst du Moose oder Flechten auf deinen Auslandreisen? – Gedanken zum Nagoya-Protokoll2015In: Meylania, Vol. 55, article id 29-31Article in journal (Other academic)
  • 9.
    Bisang, Irene
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Cronberg, Nils
    Can the meiotic sex ratio explain the sex ratio bias in adult populations in the dioicous moss Drepanocladus lycopodioides?2017In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820Article in journal (Refereed)
  • 10. Buchbender, Volker
    et al.
    Hespanhol, Helena
    Krug, Michael
    Sérgio, Cecília
    Séneca, Ana
    Maul, Karola
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Quandt, Dietmar
    Phylogenetic reconstructions of the Hedwigiaceae reveal cryptic speciation and hybridisation in Hedwigia2014In: Bryophyte Diversity and Evolution, ISSN 2381-9677, Vol. 36, p. 1-21Article in journal (Refereed)
  • 11. Draper, Isabel
    et al.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Stech, Michael
    Patiño, Jairo
    Werner, Olaf
    González-Mancebo, J. M.
    Sim-Sim, Manuela
    Lopes, Tina
    Ros, Rosa María
    How many species of Isothecium(Lembophyllaceae, Bryophyta) are there in Macaronesia? A survey usingintegrative taxonomy2015In: Botanical journal of the Linnean Society, ISSN 0024-4074, E-ISSN 1095-8339, Vol. 177, p. 418-438Article in journal (Refereed)
  • 12. Draper, Isabel
    et al.
    Mazimpaka, Vicente
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Molecular andmorphological circumscription of Brachytheciumcoruscum as a separate taxon from Brachytheciumalbicans (Brachytheciaceae, Bryophyta)2014In: Phytotaxa, ISSN 1179-3155, E-ISSN 1179-3163, Vol. 158, p. 182-194Article in journal (Refereed)
  • 13.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Amblystegiaceae (introduction and keys), Cratoneuron, Palustriella, Platydictya (H. A. Crum & L. Hedenäs), Campyliadelphus, Campylium, Drepanocladus, Pseudocalliergon, Sanionia, Conardia (H. A. Crum & L. Hedenäs), Campylophyllum, Calliergonaceae (whole family)2014In: Flora of North America, north of Mexico. Volume 28. Bryophyta, Part 2 / [ed] Flora of North America Editorial Committee, New York, Oxford: Oxford University Press, 2014Chapter in book (Refereed)
  • 14.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Brachythecium tauriscorum Molendo, a widely distributed Arctic-alpine species2017In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820Article in journal (Refereed)
  • 15.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Intraspecific diversity matters in bryophyte conservation – ITS and rpl16 variation in European mosses2016In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 38, p. 173-182Article in journal (Refereed)
  • 16.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Intraspecific genetic variation in selected mosses of Scandinavian interglacial refugia suggests contrasting distribution history patterns2014In: Botanical journal of the Linnean Society, ISSN 0024-4074, E-ISSN 1095-8339, Vol. 176, p. 295-310Article in journal (Refereed)
  • 17.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Molecular andmorphological incongruence among the genera around Sarmentypnum (Bryophyta: Calliergonaceae)2015In: Nova Hedwigia: Zeitschrift für Kryptogamenkunde, ISSN 0029-5035, Vol. 100, p. 279-292Article in journal (Refereed)
  • 18.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Rhytidium rugosum (Bryophyta) colonized Scandinaviafrom at least two glacial refugial source populations2015In: Botanical journal of the Linnean Society, ISSN 0024-4074, E-ISSN 1095-8339, no 179, p. 635-657Article in journal (Refereed)
  • 19.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Southern Scandinavianlowland populations of Rhytidium rugosum(Bryophyta, Rhytidiaceae) differ significantly from those in the mountains2014In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 36, p. 1-14Article in journal (Refereed)
  • 20.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Styv kalkmossa och andra kalkmossor i Sverige2015In: Svensk Botanisk Tidskrift, ISSN 0039-646X, Vol. 109, p. 94-104Article in journal (Other (popular science, discussion, etc.))
  • 21.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Three molecular markers suggest different relationships among three Drepanocladus species (Bryophyta: Amblystegiaceae)2017In: Plant Systematics and Evolution, ISSN 0378-2697, E-ISSN 1615-6110, Vol. 303, p. 521-529Article in journal (Refereed)
  • 22.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Tortella rigens (Bryophyta, Pottiaceae): relationships, regional variation, and conservation aspects2015In: Plant Systematics and Evolution, ISSN 0378-2697, E-ISSN 1615-6110Article in journal (Refereed)
  • 23.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Världens nordligaste lokaler för sandnäbbmossa2014In: Svensk Botanisk Tidskrift, ISSN 0039-646X, Vol. 108, p. 4-10Article in journal (Other (popular science, discussion, etc.))
  • 24.
    Hedenäs, Lars
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Bisang, Irene
    Swedish Museum of Natural History, Department of Botany.
    Are morphology andenvironment correlated with male dwarfism in pleurocarpous mosses?2015In: Arctoa: A Journal of Briology, ISSN 0131-1379, Vol. 24, p. 362-374Article in journal (Refereed)
  • 25.
    Hedenäs, Lars
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Bisang, Irene
    Swedish Museum of Natural History, Department of Botany.
    Brukar du samla mossor när du reser utomlands?2015In: Myrinia, ISSN 1102-4194, Vol. 25, no 1Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    The 'Nagoya Protocol' and its implications on collecting bryophytes abroad are discussed

  • 26.
    Hedenäs, Lars
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Bisang, Irene
    Swedish Museum of Natural History, Department of Botany.
    Infraspecific diversity in a spore-dispersed species with limited distribution range2015In: Systematics and Biodiversity, ISSN 1477-2000, E-ISSN 1478-0933, Vol. 13, p. 17-27Article in journal (Refereed)
  • 27.
    Hedenäs, Lars
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Désamoré, A.
    Laenen, Benjamin
    Papp, Beata
    Quandt, Dietmar
    González-Mancebo, J. M.
    Patiño, Jairo
    Vanderpoorten, Alain
    Stech, Michael
    Three species for theprice of one within the moss Homalotheciumsericeum s.l.2014In: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 63, p. 249-257Article in journal (Refereed)
  • 28.
    Hedenäs, Lars
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Heinrichs, Jochen
    Schmidt, Alexander R.
    Bryophytes of the Burmese amber forest: Amending and expanding the circumscription of the Cretaceous moss genus Vetiplanaxis2014In: Review of Palaeobotany and Palynology, ISSN 0034-6667, E-ISSN 1879-0615, Vol. 209, p. 1-10Article in journal (Refereed)
  • 29.
    Hedenäs, Lars
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Korpelainen, Helena
    Bisang, Irene
    Swedish Museum of Natural History, Department of Botany.
    Identifying sex in non-fertile individuals of the moss Drepanocladus turgescens (Bryophyta: Amblystegiaceae) using a novel molecular approach2016In: Journal of plant research, ISSN 0918-9440, E-ISSN 1618-0860, Vol. 129, p. 1005-1010Article in journal (Refereed)
  • 30.
    Hedenäs, Lars
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Reisborg, C.
    Hallingbäck, T.
    Nationalnyckeln till Sveriges flora och fauna. Bladmossor: Skirmossor-baronmossor. Bryophyta: Hookeria-Anomodon2014Book (Refereed)
  • 31. Heinrichs, Jochen
    et al.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Schäfer-Verwimp, Alfons
    Feldberg, Kathrin
    Schmidt, Alexander R.
    An in situ preserved moss community in Eocene Baltic amber2014In: Review of Palaeobotany and Palynology, ISSN 0034-6667, E-ISSN 1879-0615, Vol. 210, p. 113-118Article in journal (Refereed)
  • 32. Heinrichs, Jochen
    et al.
    Scheben, Armin
    Bechteler, Julia
    Lee, Gaik Ee
    Schäfer-Verwimp, Alfons
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Singh, Hukam
    Pócs, Tamas
    Nascimbene, Paul C.
    Peralta, Denilson F.
    Renner, Matt
    Schmidt, Alexander R.
    Crown group Lejeuneaceae and pleurocarpous mosses in Early Eocene (Ypresian) Indian amber2016In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, no 5, p. 1-15, article id e156301Article in journal (Refereed)
  • 33. Heinrichs, Jochen
    et al.
    Schäfer-Verwimp, Alfons
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Ignatov, Michael S.
    Schmidt, Alexander R.
    An acrocarpous moss in Cretaceous amber from Myanmar2014In: Cretaceous research (Print), ISSN 0195-6671, E-ISSN 1095-998X, Vol. 51, p. 260-265Article in journal (Refereed)
  • 34. Hugunnot, Vincent
    et al.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Arvernella microclada Hugonnot & Hedenäs (Amblystegiaceae), a new minute species from France, requiring a separate genus2015In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 37, p. 184-191Article in journal (Refereed)
  • 35. Huttunen, Sanna
    et al.
    Ahonen, I.
    Bisang, Irene
    Swedish Museum of Natural History, Department of Botany.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Laaka-Lindberg, Sanna
    Vänni, J.
    Sammalretki Ahvenanmalle keväällä 20132014In: Bryobrotherella, ISSN 1456-2766, Vol. 17, p. 114-135Article in journal (Other (popular science, discussion, etc.))
  • 36.
    Ivarsson, Magnus
    et al.
    Swedish Museum of Natural History, Department of Paleobiology. Nordic Center for Earth Evolution (NordCEE).
    Gustavsson, Lena
    Swedish Museum of Natural History, Department of Zoology.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Kronestedt, Torbjörn
    Swedish Museum of Natural History, Department of Zoology.
    Lundberg, Johannes
    Swedish Museum of Natural History, Department of Botany.
    Norbäck Ivarsson, Lena
    Södertörn University.
    Sallstedt, Therese
    Swedish Museum of Natural History, Department of Paleobiology. Nordic Center for Earth Evolution (NordCEE).
    Scheuerer, Manuela
    Sweco Rail.
    Thureborn, Olle
    Stockholm University.
    Wedin, Mats
    Swedish Museum of Natural History, Department of Botany.
    Unikt ekosystem i tunnelbanan vid Kungsträdgården2017In: Fauna och flora : populär tidskrift för biologi, ISSN 0014-8903, Vol. 112, no 1, p. 2-9Article in journal (Other (popular science, discussion, etc.))
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  • 37. Jacobson, Conny
    et al.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Campylium longicuspis (Lindb. & Arnell) Hedenäs (Bryophyta, Amblystegiaceae), another Arctic moss in the northern Scandinavian mountain range2015In: Lindbergia, ISSN 0105-0761, E-ISSN 2001-5909, Vol. 38, p. 17-19Article in journal (Refereed)
  • 38. Kooijman, Annemieke
    et al.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Mettrop, Ivan
    Cusell, Casper
    Calliergon megalophyllum rediscovered in the Netherlands after 50 years: comparison to Swedish habitats2015In: Lindbergia, ISSN 0105-0761, E-ISSN 2001-5909, Vol. 38, p. 20-29Article in journal (Refereed)
  • 39. Lönnell, Niklas
    et al.
    Hallingbäck, Tomas
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Bestämningsnyckel till släkten inom egentliga bladmossor. Bryophyta: Bryopsida: BuxbaumiaAnomodon2016Book (Other academic)
  • 40. Norhazrina, Nik
    et al.
    Vanderpoorten, Alain
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Patiño, Jairo
    What are the evolutionary mechanisms explaining the similar species richness patterns in tropical mosses? Insights from the phylogeny of the pantropical genus Pelekium2016In: Molecular Phylogenetics and Evolution, ISSN 1055-7903, E-ISSN 1095-9513, Vol. 105, p. 139-145Article in journal (Refereed)
  • 41. Orgaz, J. David
    et al.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Yamaguchi, Tomio
    Brachythecium complexum J.D.Orgaz, sp. nov., a new species from Japan2016In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 38, p. 63-66Article in journal (Refereed)
  • 42. Patino, Jairo
    et al.
    Bisang, Irene
    Swedish Museum of Natural History, Department of Botany.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Dirkse, Gerard
    Bjarnason, Agust H.
    Ah-Peng, Claudine
    Vanderpoorten, Alain
    Baker’s law and the island syndromes in bryophytes2013In: Journal of Ecology, ISSN 0022-0477, E-ISSN 1365-2745, Vol. 101, p. 1245-1255Article in journal (Refereed)
    Abstract [en]

    1. The evolution of island syndromes has long served as a model to understand the mechanisms accounting for phenotypic differentiation. Combining literature data with actual observations, we determine whether typical syndromes such as the loss of dispersal power and the bias towards selfcompatibility s law) apply to vagile organisms, using bryophytes as a model.

    2. The life-history traits (LHTs) observed in oceanic island floras were statistically different from those observed on continents, evidencing the evolution of island syndromes. In contrast, LHTs of continental and continental island floras were similar, pointing to differences in migration intensity between continents, continental islands and oceanic islands.

    3. The proportion of bisexual species was significantly higher on oceanic islands than on continents. A significant proportion of species that are unisexual or bisexual on continents shifted towards exclusive bisexuality on oceanic islands, suggesting that Baker’s law applies to bryophytes. The underlying mechanisms, however, probably differ from in situ selection for selfing.

    4. The proportion of species producing specialized asexual diaspores, which are assumed to play a role in short-distance dispersal (SDD), was higher on oceanic islands than on continents. The proportion of species producing spores, which are involved in long-distance dispersal (LDD), exhibited the reverse trend, suggesting a shift in the prevalent reproductive strategy to favour SDD on oceanic islands. Approximately 50% of the species, however, maintained the ability to produce sporophytes on oceanic islands, and the relative frequency of fertile shoots within collections of four model species was even higher on islands than on continents.

    5. Synthesis. Bryophytes exhibit typical island syndromes, indicating that migration rates between oceanic islands and continents are not sufficient to prevent the effects of genetic drift and contradicting the view that the sea does not impede migration in the group. Significant shifts in life-history traits (LHTs) towards increased production of specialized asexual diaspores and decreased sporophyte production on oceanic islands indeed point to a global loss of long-distance dispersal (LDD) ability. The maintenance of traits characteristic for LDD in a large number of species has, however, substantial consequences for our understanding of island plant evolution, and in particular, for our vision of islands as evolutionary dead ends.

  • 43. Petersen, Ævar
    et al.
    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
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    ϸórisson, Skarpehéðinn G.
    Vatnamýs á Íslandi2016In: Náttúrufræðingurinn, ISSN 0028-0550, Vol. 86, no 1-2, p. 28-41Article in journal (Refereed)
  • 44. Rams, Susana
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    Swedish Museum of Natural History, Department of Botany.
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    Ros, Rosa María
    Nuevos datos sobre la presencia de Pseudotaxiphyllum laetevirens en España2014In: Boletín de la Sociedad Española de Briología, Vol. 42-43, p. 19-24Article in journal (Other academic)
  • 45. Sim-Sim, Manuela
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    Ruas, Sara
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    Bryophyte conservation on a North Atlantic hotspot: threatened bryophytes in Madeira and Selvagens Archipelagos (Portugal)2014In: Systematics and Biodiversity, ISSN 1477-2000, E-ISSN 1478-0933, Vol. 123, p. 315-330Article in journal (Refereed)
  • 46. Vanderpoorten, Alain
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    Patiño, Jairo
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    Hedenäs, Lars
    Swedish Museum of Natural History, Department of Botany.
    Early divergence of anAzorean endemic species in the moss genus Rhynchostegiella(Brachytheciaceae)2015In: Phytotaxa, ISSN 1179-3155, E-ISSN 1179-3163, Vol. 210, p. 60-69Article in journal (Refereed)
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