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Size-Dependent Flowering in relation to Grazing in a Short-Lived Monocarpic Perennial

DOI: 10.1155/2014/346352

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Abstract:

In short-lived monocarpic perennials flowering probability depends on size and relative growth. Reproducing at a smaller size results in a higher prereproductive survival and shorter generation time but also may lead to lower fecundity. Conversely, reproducing at a larger size allows greater fecundity but leads to higher mortality during the prolonged vegetative period. Herbivory may influence the above described relationships via alterations in size at reproduction and survival. Here we use field data to explore in detail the reproduction of the short-lived monocarpic perennial C. vulgare under seasonal grazing. Vegetative plants were marked in paddocks with and without winter grazing, and their size, growth, and flowering status were recorded during a growing season in a field grazing experiment. Grazing increased both survival of vegetative plants and flowering probability, but it did not affect flowering size. The increase in flowering probability is a result of differential plant growth and size and may be related to greater resource availability, including light (necessary for flowering induction in C. vulgare) in grazed paddocks. 1. Introduction Biennial plants have been characterised as plants that grow vegetatively in their first growing season, flower in the next, and die after flowering. However, in the field, most of them behave as short-lived monocarpic perennials [1–3]. In these species, flowering probability depends on size and relative growth just before bolting rather than on age [2, 4]. In relation to this trait, the concepts of “flowering size,” “size at flowering,” and “threshold size for flowering” have been used equivalently. The threshold size for flowering is equal to or above the physiological minimum size to produce one seed, and it is referred to as an internal plant setting that can be reflected by plant size at flowering [5]. Optimisation models for flowering have shown that the threshold size is probably the result of the interplay between size-dependent growth, which in turn determines the increase in seed production and size-dependent survival [1, 5, 6]. The optimal reproductive size is determined through the trade-off between survival and fecundity affected by the critical size of reproduction. Reproducing at a smaller size results in a higher prereproductive survival and shorter generation time but also may lead to lower fecundity. Conversely, reproducing at a larger size allows greater fecundity but leads to higher mortality during the prolonged vegetative period [7]. In real populations, factors like pollination

References

[1]  N. Kachi and T. Hirose, “Population dynamics of Oenothera glazioviana in a sand-dune system with special reference to the adaptive significance of size-dependent reproduction,” Journal of Ecology, vol. 73, no. 3, pp. 887–901, 1985.
[2]  P. G. L. Klinkhamer, T. J. de Jong, and E. Meelis, “Delay of flowering in the 'biennial' Cirsium vulgare: size effects and devernalization,” Oikos, vol. 49, no. 3, pp. 303–308, 1987.
[3]  J. M. Bullock, B. C. Hill, and J. Silvertown, “Demography of Cirsium vulgare in a grazing experiment,” Journal of Ecology, vol. 82, no. 1, pp. 101–111, 1994.
[4]  E. P. Lacey, “Onset of reproduction in plants: size-versus age-dependency,” Trends in Ecology and Evolution, vol. 1, no. 3, pp. 72–75, 1986.
[5]  R. A. Wesselingh, P. G. L. Klinkhamer, T. J. de Jong, and L. A. Boorman, “Threshold size for flowering in different habitats: effects of size-dependent growth and survival,” Ecology, vol. 78, no. 7, pp. 2118–2132, 1997.
[6]  T. J. de Jong, P. G. L. Klinkhamer, and E. van der Meijden, “Why biennials delay flowering: an optimization model and field data on Cirsium vulgare and Cynoglossum officinale,” Acta Botanica Neerlandica, vol. 38, no. 1, pp. 41–55, 1989.
[7]  N. Kachi, “Evolution of size-dependent reproduction in biennial plants: a demographic approach,” in Biological Approaches and Evolutionary Trends in Plants, S. Kawano, Ed., pp. 205–227, Academic Press, London, UK, 1990.
[8]  W. M. Schaffer and M. V. Schaffer, “The adaptive significance of variations in reproductive habit in the Agavaceae. II: pollinator foraging behaviour and selection for increased reproductive expenditure,” Ecology, vol. 60, pp. 1051–1069, 1977.
[9]  T. P. Young, “Lobelia telekii herbivory, mortality, and size at reproduction: variation with growth rate,” Ecology, vol. 66, no. 6, pp. 1879–1883, 1985.
[10]  A. Diaz, “Can plant palatability trials be used to predict the effect of rabbit grazing on the flora of ex-arable land?” Agriculture, Ecosystems and Environment, vol. 78, no. 3, pp. 249–259, 2000.
[11]  F. Forcella and H. Wood, “Demography and control of Cirsium vulgare in relation to grazing,” Weed Research, vol. 26, pp. 199–206, 1986.
[12]  A. R. Clapham, T. G. Tutin, and D. M. Moore, Flora of the British Isles, Cambridge University Press, Cambridge, UK, 1987.
[13]  M. Gillman, J. M. Bullock, J. Silvertown, and B. C. Hill, “A density-dependent model of Cirsium vulgare population dynamics using field-estimated parameter values,” Oecologia, vol. 96, no. 2, pp. 282–289, 1993.
[14]  R. A. Wesselingh, P. G. L. Klinkhamer, T. J. de Jong, and E. G. M. Schlatmann, “A latitudinal cline in vernalization requirement in Cirsium vulgare,” Ecography, vol. 17, no. 3, pp. 272–277, 1994.
[15]  J. M. Bullock, J. Franklin, M. J. Stevenson et al., “A plant trait analysis of responses to grazing in a long-term experiment,” Journal of Applied Ecology, vol. 38, no. 2, pp. 253–267, 2001.
[16]  P. G. L. Klinkhamer and T. J. de Jong, “The importance of small-scale disturbance for seedling establishment in Cirsium vulgare and Cynoglossum officinale,” Journal of Ecology, vol. 76, no. 2, pp. 383–392, 1988.
[17]  J. Silvertown and B. Smith, “Germination and population structure of spear thistle Cirsium vulgare in relation to experimentally controlled sheep grazing,” Oecologia, vol. 81, no. 3, pp. 369–373, 1989.
[18]  P. G. L. Klinkhamer, T. J. de Jong, and E. Meelis, “The control of flowering in the monocarpic perennial Carlina vulgaris,” Oikos, vol. 61, no. 1, pp. 88–95, 1991.
[19]  P. G. L. Klinkhamer, T. J. de Jong, and E. Meelis, “How to test for proportionality in the reproductive effort of plants,” The American Naturalist, vol. 135, no. 2, pp. 291–300, 1990.
[20]  P. G. L. Klinkhamer, E. Meelis, T. J. de Jong, and J. Weiner, “On the analysis of size-dependent reproductive output in plants,” Functional Ecology, vol. 6, no. 3, pp. 308–316, 1992.
[21]  N. Kachi and T. Hirose, “Bolting induction in Oenothera erythrosepala Borbás in relation to rosette size, vernalization, and photoperiod,” Oecologia, vol. 60, no. 1, pp. 6–9, 1983.
[22]  J. C. Metcalf, K. E. Rose, and M. Rees, “Evolutionary demography of monocarpic perennials,” Trends in Ecology and Evolution, vol. 18, no. 9, pp. 471–480, 2003.
[23]  R. J. Hobbs and L. F. Huenneke, “Disturbance, diversity, and invasion: implications for conservation,” Conservation Biology, vol. 6, no. 3, pp. 324–337, 1992.
[24]  J. M. DiTomaso, G. B. Kyser, and C. B. Pirosko, “Effect of light and density on yellow starthistle (Centaurea solstitialis) root growth and soil moisture use,” Weed Science, vol. 51, no. 3, pp. 334–341, 2003.
[25]  B. S. Schamp, L. W. Aarssen, and S. Wight, “Effects of “target” plant species body size on neighbourhood species richness and composition in old-field vegetation,” PLoS ONE, vol. 8, no. 12, Article ID e82036, 2013.
[26]  L. Malíková, P. ?milauer, and J. Klime?ová, “Occurrence of adventitious sprouting in short-lived monocarpic herbs: a field study of 22 weedy species,” Annals of Botany, vol. 105, no. 6, pp. 905–912, 2010.

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