Abstract
Host trees for obligate epiphytes are dynamic patches that emerge, grow and fall, and metacommunity diversity critically depends on efficient dispersal. Even though species that disperse by large asexual diaspores are strongly dispersal limited, asexual dispersal is common. The stronger dispersal limitation of asexually reproducing species compared to species reproducing sexually via small spores may be compensated by higher growth rates, lower sensitivity to habitat conditions, higher competitive ability or younger reproductive age. We compared growth and reproduction of different groups of epiphytic bryophytes with contrasting dispersal (asexual vs. sexual) and life history strategies (colonists, short- and long-lived shuttle species, perennial stayers) in an old-growth forest stand in the boreo-nemoral region in eastern Sweden. No differences were seen in relative growth rates between asexual and sexual species. Long-lived shuttles had lower growth rates than colonists and perennial stayers. Most groups grew best at intermediate bark pH. Interactions with other epiphytes had a small, often positive effect on growth. Neither differences in sensitivity of growth to habitat conditions nor differences in competitive abilities among species groups were found. Habitat conditions, however, influenced the production of sporophytes, but not of asexual diaspores. Presence of sporophytes negatively affected growth, whereas presence of asexual diaspores did not. Sexual species had to reach a certain colony size before starting to reproduce, whereas no such threshold existed for asexual reproduction. The results indicate that the epiphyte metacommunity is structured by two main trade-offs: dispersal distance vs. reproductive age, and dispersal distance vs. sensitivity to habitat quality. There seems to be a trade-off between growth and sexual reproduction, but not asexual. Trade-offs in species traits may be shaped by conflicting selection pressures imposed by habitat turnover and connectivity rather than by species interactions.
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References
Akaike H (1974) A new look at statistical model identification. IEEE Trans Autom Contr AC 19:716–722
Amarasekare P (2003) Competitive coexistence in spatially structured environments: a synthesis. Ecol Lett 6:1109–1122
Anonymous (1997) Fältinstruktion för ståndortskarteringen. Institutionen för Skoglig Marklära, SLU, Uppsala
Bates D, Maechler M, Dai B (2008) lme4 version 0.999375-28. http://www.lme4.r-forge.r-project.org/
Bengtsson J, Fagerström T, Rydin H (1994) Competition and coexistence in plant communities. Trees 9:246–250
Bisang I, Ehrlén J (2002) Reproductive effort and cost of sexual reproduction in female Dicranum polysetum. Bryologist 105:384–397
Bossuyt B, Honnay O (2006) Interactions between plant life span, seed dispersal capacity and fecundity determine metapopulation viability in a dynamic landscape. Landscape Ecol 21:1195–1205
Burnham KP, Anderson DR (2002) Model selection and multimodel inference, 2nd edn. Springer, New York
Cadotte MW, Mai DV, Jantz S, Collins MD, Keele M, Drake JA (2006) On testing the competition-colonization trade-off in a multispecies assemblage. Am Nat 168:704–709
Chase JM, Amarasekare P, Cottenie K, Gonzales A, Holt RD, Holyoak M, Hoopes MF, Leibold MA, Loreau M, Mouquet N, Shurin JB, Tilman D (2005) Competing theories for competitive metacommunities. In: Holyoak M, Leibold MA, Holt RD (eds) Metacommunities. The University of Chicago Press, Chicago, pp 335–354
Chesson P (2000) Mechanisms of maintenance of species diversity. Annu Rev Ecol Syst 31:343–366
Dettki H, Esseen P-A (2003) Modelling long-term effects of forest management on epiphytic lichens in northern Sweden. For Ecol Manage 175:223–238
Dierßen K (2001) Distribution, ecological amplitude and phytosociological characterization of European bryophytes. Cramer, Berlin
During HJ (1979) Life strategies of bryophytes: a preliminary review. Lindbergia 5:2–18
During HJ (1992) Ecological classification of bryophytes and lichens. In: Bates JW, Farmer AM (eds) Bryophytes and lichens in a changing environment. Clarendon Press, Oxford, pp 1–31
During HJ (2007) Relations between clonal growth, reproduction and breeding system in the bryophytes of Belgium and The Netherlands. Nova Hedw Beih 131:133–145
Ehrlén J, Bisang I, Hedenäs L (2000) Costs of sporophyte production in the moss, Dicranum polysetum. Plant Ecol 149:207–217
Eriksson P (1997) Ekologisk landskapsplanering i Vällenområdet, Rapport 5. Upplandsstiftelsen, Uppsala
Frahm J-P, Frey W (2004) Moosflora, 2nd edn. Ulmer, Stuttgart
Frazer GW, Canham CD, Lertzman KP (1999) Gap Light Analyzer (GLA), Version 2.0: Imaging software to extract canopy structure and gap light transmission indices from true-colour fisheye photographs, users manual and program documentation. Simon Fraser University, Burnaby, Insitute of Ecosystem Studies, Millbrook
Hill MO, Preston CD, Bosanquet SDS, Roy DB (2007) Bryoatt—attributes of British and Irish mosses, liverworts and hornworts. CEH, NERC, Norwich
Holyoak M, Leibold MA, Mouquet NM, Holt RD, Hoopes MF (2005) Metacommunities: a framework for large-scale community ecology. In: Holyoak M, Leibold MA, Holt RD (eds) Metacommunities. The University of Chicago press, Chicago, pp 1–31
Ingerpuu N, Vellak K, Möls T (2007) Growth of Neckera pennata, an epiphytic moss of old-growth forests. Bryologist 110:309–318
Johst K, Brandl R, Eber S (2002) Metapopulation persistence in dynamic landscapes: the role of dispersal distance. Oikos 98:263–270
Karlsson S (2007) Image. http://www.sk-biometri.se
Kimmerer RW (1994) Ecological consequences of sexual versus asexual reproduction in Dicranum flagellare and Tetraphis pellucida. Bryologist 97:20–25
Kneitel JM, Chase JM (2004) Trade-offs in community ecology: linking spatial scales and species coexistence. Ecol Lett 7:69–80
Laaka-Lindberg S, Korpelainen H, Pohjama M (2003) Dispersal of asexual propagules in bryophytes. J Hattori Bot Lab 93:319–330
Laaka-Lindberg S, Korpelainen H, Pohjama M (2006) Spatial distribution of epixylic hepatics in relation to substrate in a boreal old-growth forest. J Hattori Bot Lab 100:311–323
Leibold MA, Miller TE (2004) From metapopulations to metacommunities. In: Hanski I, Gaggiotti OE (eds) Ecology, genetics, and evolution of metapopulations. Elsevier, Amsterdam, pp 133–150
Löbel S, Snäll T, Rydin H (2006a) Species richness patterns and metapopulation processes—evidence from epiphyte communities in boreo-nemoral forests. Ecography 26:169–182
Löbel S, Snäll T, Rydin H (2006b) Metapopulation processes in epiphytes inferred from patterns of regional distribution and local abundance in fragmented forest landscapes. J Ecol 94:856–868
Löbel S, Snäll T, Rydin H (2009) Mating system, reproduction mode and diaspore size affect metacommunity diversity. J Ecol 97:176–185
Loehle C (2000) Strategy space and the disturbance spectrum: a life-history model for tree species coexistence. Am Nat 156:14–33
Miller TE, Kneitel JM (2005) Inquiline communities in pitcher plants as a prototypical metacommunity. In: Holyoak M, Leibold MA, Holt RD (eds) Metacommunities. The University of Chicago press, Chicago, pp 122–145
Mulder CPH, Uliassi DD, Doak DF (2001) Physical stress and diversity-productivity relationships: the role of positive interactions. PNAS 98:6704–6708
Pinheiro J, Bates D, DebRoy S, Sarkar D (2008) nlme version 3.1-90. R Foundation for Statistical Computing, Vienna
Pohjamo M, Laaka-Lindberg S (2004) Demographic structure of a leafy epixylic hepatic Anastrophyllum hellerianum (Nees ex Lindenb.) R.M. Schust. Plant Ecol 173:3–81
Pohjamo M, Laaka-Lindberg S, Ovaskainen O, Korpelainen H (2006) Dispersal potential of spores and asexual diaspores in the epixylic hepatic Anastrophyllum hellerianum. Evol Ecol 20:415–430
R Development Core Team (2008) R: a language and environment for statistical computing. R Foundation for Statistical Computing
Rixen C, Mulder CPH (2005) Improved water retention links high species richness with increased productivity in artic tundra moss communities. Oecologia 146:287–299
Rydgren K, Økland RH (2002) Ultimate costs of sporophyte production in the clonal moss Hylocomium splendens. Ecology 83:1573–1579
Rydin H (2009) Population and community ecology of bryophytes. In: Shaw AJ, Goffinet B (eds) Bryophyte biology, 2nd edn. Cambridge University Press, Cambridge, pp 393–444
Siebel HN, During HJ (2006) Beknopte mosflora van Nederland en België. K.N.N.V., Utrecht
Snäll T, Ribeiro PJ Jr, Rydin H (2003) Spatial occurrence and colonizations in patch-tracking metapopulations: local conditions versus dispersal. Oikos 103:566–578
Snäll T, Fogelqvist J, Ribeiro PJ Jr, Lascoux M (2004a) Spatial genetic structure in two congeneric epiphytes with different dispersal strategies analysed by three different methods. Mol Ecol 13:2109–2119
Snäll T, Hagström A, Rudolphi J, Rydin H (2004b) Distribution pattern of the epiphyte Neckera pennata on three spatial scales—importance of past landscape structure, connectivity, and local conditions. Ecography 27:757–766
Snäll T, Ehrlén J, Rydin H (2005) Colonization and extinction dynamics of an epiphyte metapopulation in a dynamic landscape. Ecology 86:106–115
Venables WN, Ripley BD (1999) Modern applied statistics with S-PLUS. Springer, Berlin
Wiklund K, Rydin H (2004a) Colony expansion of Neckera pennata: modelled growth rate and effect of microhabitat, competition, and precipitation. Bryologist 107:293–301
Wiklund K, Rydin H (2004b) Ecophysiological constraints on spore establishment in bryophytes. Funct Ecol 18:907–913
Zartman CE, Shaw AJ (2006) Metapopulation extinction thresholds in rain forest remnants. Am Nat 167:177–189
Acknowledgements
We thank Irene Bisang, Heinjo During, Tord Snäll, Sebastian Sundberg and Lars Söderström for useful comments on the manuscript, and Scott Spellerberg for revising the English. Financial support was received from FORMAS. The work conforms to the legal requirements of the countries in which it was carried out, including those relating to conservation and welfare.
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Communicated by Brian Beckage.
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Löbel, S., Rydin, H. Dispersal and life history strategies in epiphyte metacommunities: alternative solutions to survival in patchy, dynamic landscapes. Oecologia 161, 569–579 (2009). https://doi.org/10.1007/s00442-009-1402-1
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DOI: https://doi.org/10.1007/s00442-009-1402-1