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Plant Biol (Stuttg) 2003; 5(5): 522-530
DOI: 10.1055/s-2003-44788
Original Paper

Georg Thieme Verlag Stuttgart · New York

Fitness Traits and Dispersal Ability in the Herb Tragopogon pratensis (Asteraceae): Decoupling the Role of Inbreeding Depression and Maternal Effects

F. X. Picó 1 , N. J. Ouborg 1 , J. M. van Groenendael 1
  • 1Department of Ecology, University of Nijmegen, Nijmegen, The Netherlands
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Publikationsverlauf

Publikationsdatum:
27. November 2003 (online)

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Abstract

Inbreeding depression can decrease several fitness traits and maternal effects can strongly influence the amount of inbreeding depression. Understanding the effects of inbreeding depression on plant fitness is especially important in the context of habitat fragmentation, where plant populations become smaller and more isolated, exhibiting increasing levels of inbreeding depression. We examined the joint influence of inbreeding depression and maternal effects on life cycle traits and dispersal ability in the herb Tragopogon pratensis that grows in fragmented populations in Europe. We conducted experimental crosses to obtain selfed and outcrossed progeny in two contrasted environments. In particular, we produced a first generation of seeds and plants that were self-pollinated again to produce a second generation of seeds. Individual seeds were weighed and their pappuses measured to estimate the dispersal potential. Pollination treatment only had a significant effect on seed mass and dispersal ability. Coefficients of inbreeding depression did not differ between selfed and outcrossed plants. Seed mass had a significant effect on germination date. Environment had a significant effect on mass of the second generation of seeds and the interaction between pollination treatment and family was significant for six traits, indicating the existence of strong maternal effects in T. pratensis. Results suggest population differentiation. Overall, T. pratensis populations exhibited a good performance under selfing, in terms of life cycle traits and dispersal ability, which would allow the species to cope with problems associated with fragmentation.

Key words

Life cycle traits - mating system - seed size - self-compatibility - terminal velocity - trade-off.

References

  • 1 Ågren J., Schemske D. W.. Outcrossing rate and inbreeding depression in two annual monoecious herbs, Begonia hirsuta and B. semiovata. .  Evolution. (1993);  47 125-135
    PubMedGoogle Scholar
  • 2 Barrett S. C. H., Charlesworth D.. Effects of a change in the level of inbreeding on the genetic load.  Nature. (1991);  352 522-524
    CrossrefPubMedGoogle Scholar
  • 3 Byers D. L., Waller D. M.. Do plant populations purge their genetic load? Effects of population size and mating history on inbreeding depression.  Annual Review of Ecology and Systematics. (1999);  30 479-513
    CrossrefPubMedGoogle Scholar
  • 4 Carr D. E., Dudash M. R.. Inbreeding depression under a competitive regime in Mimulus guttatus: consequences for potential male and female function.  Heredity. (1996);  75 437-445
    PubMedGoogle Scholar
  • 5 Caswell H.. Matrix Population Models. Construction, Analysis, and Interpretation, 2nd edn. Sunderland; Sinauer Associates (2001): 43
    Google Scholar
  • 6 Charlesworth D., Charlesworth B.. Inbreeding depression and its evolutionary consequences.  Annual Review of Ecology and Systematics. (1987);  18 237-268
    CrossrefPubMedGoogle Scholar
  • 7 Charelsworth B., Charlesworth D.. The genetic basis of inbreeding depression.  Genetical Research. (1999);  74 329-340
    CrossrefPubMedGoogle Scholar
  • 8 Charlesworth D., Morgan M. T., Charlesworth B.. Inbreeding depression, genetic load, and the evolution of outcrossing rates in a multi-locus system with no linkage.  Evolution. (1990);  44 1469-1489
    PubMedGoogle Scholar
  • 9 del Castillo R. F.. Fitness consequences of maternal and nonmaternal components of inbreeding in the gynodioecious Phacelia dubia. .  Evolution. (1998);  52 44-60
    PubMedGoogle Scholar
  • 10 Donohue K.. Effects of inbreeding on traits that influence dispersal and progeny density in Cakile edentula var. lacustris (Brassicaceae).  American Journal of Botany. (1998);  85 661-668
    PubMedGoogle Scholar
  • 11 Dudash M. R.. Relative fitness of selfed and outcrossed progeny in a self-compatible, protandrous species, Sabatia angularis L. (Gentianaceae): a comparison in three environments.  Evolution. (1990);  44 1129-1139
    PubMedGoogle Scholar
  • 12 Dudash M. R., Fenster C. B.. The role of breeding system and inbreeding depression in the maintenance of an outcrossing mating strategy in Silene virginica (Caryophyllaceae).  American Journal of Botany. (2001);  88 1953-1959
    PubMedGoogle Scholar
  • 13 Dudash M. R., Carr D. E., Fenster C. B.. Five generations of enforced selfing and outcrossing in Mimulus guttatus: Inbreeding depression variation at the population and family level.  Evolution. (1997);  51 54-65
    PubMedGoogle Scholar
  • 14 Falconer D. S., Mackay T. F. C.. Introduction to Quantitative Genetics, 4th edn. Harlow; Longmann Group Ltd (1996)
    Google Scholar
  • 15 Futuyma D. J.. Evolutionary Biology, 3rd edn. Sunderland; Sinauer Associates (1998)
    Google Scholar
  • 16 Galloway L. F.. The effect of maternal and paternal environments on seed characters in the herbaceous plant Campanula americana (Campanulaceae).  American Journal of Botany. (2001);  88 832-840
    PubMedGoogle Scholar
  • 17 Ganeshaiah K. N., Shaanker R. U.. Seed size optimization in a wind-dispersed tree Butea monosperma - a trade-off between seedling establishment and pod dispersal efficiency.  Oikos. (1991);  60 3-6
    PubMedGoogle Scholar
  • 18 Goodwillie C.. Inbreeding depression and mating systems in two species of Linanthus (Polemoniaceae).  Heredity. (2000);  84 283-293
    CrossrefPubMedGoogle Scholar
  • 19 Greene D. F., Johnson E. A.. Seed mass and dispersal capacity in wind-dispersed diaspores.  Oikos. (1993);  67 69-74
    PubMedGoogle Scholar
  • 20 Helenurm K., Schaal B. A.. Genetic and maternal effects on offspring fitness in Lupinus texensis (Fabaceae).  American Journal of Botany. (1996);  83 1596-1608
    PubMedGoogle Scholar
  • 21 Husband B. C., Schemske D. W.. Evolution and the magnitude and timing of inbreeding depression in plants.  Evolution. (1996);  50 54-70
    PubMedGoogle Scholar
  • 22 Imbert E., Ronce O.. Phenotypic plasticity for dispersal ability in the seed heteromorphic Crepis sancta (Asteraceae).  Oikos. (2001);  93 126-134
    CrossrefPubMedGoogle Scholar
  • 23 Johnson M. L., Gaines M. S.. Evolution of dispersal - Theoretical models and empirical tests using birds and mammals.  Annual Review of Ecology and Systematics. (1990);  21 449-480
    CrossrefPubMedGoogle Scholar
  • 24 Johnston M. O., Schoen D. J.. Mutation rates and dominance levels of genes affecting total fitness in two angiosperm species.  Science. (1995);  267 226-229
    PubMedGoogle Scholar
  • 25 Kalisz S.. Fitness consequences of mating system, seed weight, and emergence date in a winter annual, Collinsia verna. .  Evolution. (1989);  43 1263-1272
    PubMedGoogle Scholar
  • 26 Koelewijn H. P.. Effects of different levels of inbreeding on progeny fitness in Plantago coronopus. .  Evolution. (1998);  52 692-702
    PubMedGoogle Scholar
  • 27 Lande R., Schemske D. W.. The evolution of self-fertilization and inbreeding depression in plants. I. Genetic models.  Evolution. (1985);  39 24-40
    PubMedGoogle Scholar
  • 28 Leishman M. R., Westoby M.. Hypotheses on seed size: tests using semiarid flora of western New South Wales, Australia.  American Naturalist. (1994);  143 890-906
    CrossrefPubMedGoogle Scholar
  • 29 Levin D. A.. The effects of inbreeding on seed survivorship in Phlox. .  Evolution. (1991);  45 1047-1049
    PubMedGoogle Scholar
  • 30 Lynch M., Pfrender M., Spitze  et al. K.. The quantitative and molecular genetic architecture of subdivided species.  Evolution. (1999);  53 100-110
    PubMedGoogle Scholar
  • 31 Maun M. A., Payne A. M.. Fruit and seed polymorphism and its relation to seedling growth in the genus Cakile. .  Canadian Journal of Botany. (1989);  67 2743-2750
    PubMedGoogle Scholar
  • 32 Meyer S. E., Carlson S. L.. Achene mass variation in Ericameria nauseosus (Asteraceae) in relation to dispersal ability and seedling fitness.  Functional Ecology. (2001);  15 274-281
    CrossrefPubMedGoogle Scholar
  • 33 Montalvo A. M.. Inbreeding depression and maternal effects in Aquilegia caerulea, a partially selfing plant.  Evolution. (1994);  75 2395-3409
    PubMedGoogle Scholar
  • 34 Mutikainen P., Delph L. F.. Inbreeding depression in gynodioecious Lobelia siphilitica: among-family differences override between-morph differences.  Evolution. (1998);  52 1572-1582
    PubMedGoogle Scholar
  • 35 Ouborg N. J., Biere A., Mudde C. L.. Inbreeding effects on resistance and transmission-related traits in the Silene-Microbotryum pathosystem.  Ecology. (2000);  81 520-531
    PubMedGoogle Scholar
  • 36 Pedhazur E. J.. Multiple Regression in Behavioral Research: Explanation and Prediction, 2nd edn. New York; Holt, Rinehart and Winston (1982)
    Google Scholar
  • 37 Roach D. A., Wulff R.. Maternal effects in plants.  Annual Review of Ecology and Systematics. (1987);  18 209-235
    CrossrefPubMedGoogle Scholar
  • 38 Schoen D. J.. Relative fitness of selfed and outcrossed progeny in Gilia achilleifolia (Polemoniaceae).  Evolution. (1983);  37 292-301
    PubMedGoogle Scholar
  • 39 Shultz S. T., Willis J. H.. Individual variation in inbreeding depression - The roles of inbreeding history and mutation.  Genetics. (1995);  141 1209-1223
    PubMedGoogle Scholar
  • 40 Soons M. B., Heil G. W.. Reduced colonization capacity in fragmented populations of wind-dispersed grassland forbs.  Journal of Ecology. (2002);  90 1033-1044
    CrossrefPubMedGoogle Scholar
  • 41 Thiede D. A., Augspurger C. K.. Intraspecific variation in seed dispersion of Lepidium campestre (Brassicaceae).  American Journal of Botany. (1996);  83 856-866
    PubMedGoogle Scholar
  • 42 van Kleunen M., Fisher M.. Adaptive evolution of plastic foraging responses in a clonal plant.  Ecology. (2001);  82 3309-3319
    PubMedGoogle Scholar
  • 43 van Tienderen P. H., van der Toorn J.. Genetic differentiation between populations of Plantago lanceolata. I. Local adaptation in three contrasting habitats.  Journal of Ecology. (1991);  79 27-42
    PubMedGoogle Scholar
  • 44 van Treuren R., Bijlsma R., Ouborg N. J., van Delden W.. The significance of genetic erosion in the process of extinction. IV. Inbreeding depression and heterosis effects caused by selfing and outcrossing in Scabiosa columbaria. .  Evolution. (1993);  47 1669-1680
    PubMedGoogle Scholar
  • 45 Wolfe L. M.. Inbreeding depression in Hydrophyllum appendiculatum: role of maternal effects, crowding, and parental mating history.  Evolution. (1993);  47 374-386
    PubMedGoogle Scholar
  • 46 Young A. G., Clarke G. M.. Genetics, Demography and Viability of Fragmented Populations. Cambridge; Cambridge University Press (2000)
    Google Scholar

F. X. Picó

Department of Ecology
University of Nijmegen

Toernooiveld 1

6525 ED Nijmegen

The Netherlands

eMail: xavier.pico@sci.kun.nl

Section Editor: K. Clay

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