Population Ecology

, Volume 50, Issue 4, pp 343–355 | Cite as

Mast seeding, predator satiation, and temperature cues in Chionochloa (Poaceae)

  • Dave Kelly
  • Matthew H. Turnbull
  • Richard P. Pharis
  • Michal S. Sarfati
Special Feature: Original Article Spatial Population Synchrony

Abstract

Snow tussocks (Chionochloa spp.) in New Zealand exhibit extreme mast seeding which is synchronised within and among populations and species over large spatial scales. This masting behaviour satiates three endemic insect seed predators, and the weather cue that triggers heavy flowering has been reported as a very warm austral summer in the year before flowering. Here we elucidate the details of flowering, predator satiation, and temperature cues for Chionochloa. A 22-year observational data set for Chionochloa pallens from 1,070 m elevation on Mt Hutt, Canterbury, indicates that flowering was highly variable (CV = 1.79) which was effective in predator satiation, and the key cue for heavy flowering was warm temperatures between 1 January and 7 February the year before flowering. Both the number of inflorescences per tussock (the most variable component of reproductive output) and the number of florets per inflorescence were increased. Surprisingly, there were also same-season effects of temperatures between October and December on the number of inflorescences per tussock produced in late December through February. Experimental warming of tussocks using open-topped clear plastic enclosure tubes verified the same-season observations by significantly increasing flowering in the current season, but much less often increased flowering in the subsequent season. A comparison of masting patterns 1990–2008 with altitude in two tussock species, C. pallens and C. macra, indicates that at higher altitudes (ca. 1,580 m vs. 1,070 m) the temperature thresholds for a given flowering effort were lowered. The lowering of thresholds (2.1°C in C. pallens and 1.5°C in C. macra) was similar to the reduction in mean growing-season air temperatures (2.0°C) found between the sites. Thus, despite different local temperatures at high and low altitude sites, the different populations flowered with a similar intensity each year. The primary benefit of mast seeding in Chionochloa appears to be predator satiation, and the key predator (the cecidomyiid Eucalyptodiplosis chionochloae) has extended diapause. If diapause can be influenced by climate cues, the exact nature of the climate cues will be important to the evolutionary interaction between the plant and its seed predators.

Keywords

Cecidomyiid Climate cues Diapause Predator satiation Synchrony of seeding 

Notes

Acknowledgments

We thank the Department of Conservation and Alistair and Jeanette Maxwell for permission to work at Mt Hutt; the Mt Hutt skifield company for facilitating road access; Roger Dungan, Kate Rose, Nicola Day, and Veronica Clifford for help with field work; Mark McKone for initiating the Chionochloa study at Mt Hutt; and the Marsden Fund administered by the Royal Society of New Zealand for funding under grant UOC0403.

References

  1. Allen RB, Platt KH (1990) Annual seedfall variation in Nothofagus solandri (Fagaceae), Canterbury, New Zealand. Oikos 57:199–206. doi:10.2307/3565940 CrossRefGoogle Scholar
  2. Boutin S, Wauters LA, McAdam AG, Humphries MM, Tosi G, Dhondt AA (2006) Anticipatory reproduction and population growth in seed predators feeding on pulsed resources. Science 314:1928–1930. doi:10.1126/science.1135520 PubMedCrossRefGoogle Scholar
  3. Brockerhoff EG, Kenis M (1997) Oviposition, life cycle, and parasitoids of the spruce cone maggot, Strobilomyia anthracian (Diptera: Anthomyiidae), in the Alps. Bull Entomol Res 87:555–562CrossRefGoogle Scholar
  4. Clout MN, Craig JL (1995) The conservation of critically endangered flightless birds in New Zealand. Ibis 137:S181–S190. doi:10.1111/j.1474-919X.1995.tb08440.x CrossRefGoogle Scholar
  5. Connor HE (1967) Interspecific hybrids in Chionochloa (Gramineae). NZ J Bot 5:3–16Google Scholar
  6. Connor HE (1991) Chionochloa Zotov (Gramineae) in New Zealand. NZ J Bot 29:219–282Google Scholar
  7. Connor HE, Lloyd KM (2004) Species novae graminum Novae-Zelandiae II. Chionochloa nivifera (Danthonieae:Danthonioideae). NZ J Bot 42:531–536Google Scholar
  8. Dunberg A, Malmberg G, Sassa T, Pharis RP (1983) Metabolism of tritiated gibberellins A4 and A9 in Norway spruce, Picea abies (L.) Karst. Effects of a cultural treatment known to enhance flowering. Plant Physiol 71:257–262PubMedGoogle Scholar
  9. Edgar E, Connor HE (2000) Flora of New Zealand, vol V: grasses. Manaaki Whenua, LincolnGoogle Scholar
  10. Greer DH (1979) Effects of long-term preconditioning on growth and flowering of some snow tussock (Chionochloa spp.) populations in Otago, New Zealand. Aust J Bot 27:617–630. doi:10.1071/BT9790617 CrossRefGoogle Scholar
  11. Hanski I (1988) Four kinds of extra-long diapause in insects: a review of theory and observations. Ann Zool Fenn 25:37–53Google Scholar
  12. Hay J, Kelly D, Holdaway RJ (2008) Causes and consequences of frequent flowering on edges in the mast seeding genus Chionochloa (Poaceae). NZ J Ecol 32:80–91Google Scholar
  13. Janzen DH (1971) Seed predation by animals. Annu Rev Ecol Syst 2:465–492. doi:10.1146/annurev.es.02.110171.002341 CrossRefGoogle Scholar
  14. Kelly D (1994) The evolutionary ecology of mast seeding. Trends Ecol Evol 9:465–470. doi:10.1016/0169-5347(94)90310-7 CrossRefGoogle Scholar
  15. Kelly D, Sork VL (2002) Mast seeding in perennial plants: why, how, where? Annu Rev Ecol Syst 33:427–447. doi:10.1146/annurev.ecolsys.33.020602.095433 CrossRefGoogle Scholar
  16. Kelly D, Sullivan JJ (1997) Quantifying the benefits of mast seeding on predator satiation and wind pollination in Chionochloa pallens (Poaceae). Oikos 78:143–150. doi:10.2307/3545810 CrossRefGoogle Scholar
  17. Kelly D, McKone MJ, Batchelor KJ, Spence JR (1992) Mast seeding of Chionochloa (Poaceae) and pre-dispersal seed predation by a specialist fly (Diplotoxa, Diptera: Chloropidae). NZ J Bot 30:125–133Google Scholar
  18. Kelly D, Harrison AL, Lee WG, Payton IJ, Wilson PR, Schauber EM (2000) Predator satiation and extreme mast seeding in 11 species of Chionochloa (Poaceae). Oikos 90:477–488. doi:10.1034/j.1600-0706.2000.900306.x CrossRefGoogle Scholar
  19. Kelly D, Hart DE, Allen RB (2001) Evaluating the wind-pollination benefits of mast seeding. Ecology 82:117–126Google Scholar
  20. Koenig WD, Knops JMH (2000) Patterns of annual seed production by Northern Hemisphere trees: a global perspective. Am Nat 155:59–69. doi:10.1086/303302 PubMedCrossRefGoogle Scholar
  21. Koenig WD, Kelly D, Sork VL, Duncan RP, Elkinton JS, Peltonen MS et al (2003) Dissecting components of population-level variation in seed production, and the evolution of masting. Oikos 102:581–591. doi:10.1034/j.1600-0706.2003.12272.x CrossRefGoogle Scholar
  22. Kolesik P, Sarfati M, Brockerhoff EG, Kelly D (2007) Description of Eucalyptodiplosis chionochloae sp. nov., a cecidomyiid feeding on inflorescences of Chionochloa (Poaceae) in New Zealand. NZ J Zool 34:107–115Google Scholar
  23. Liebhold A, Sork V, Peltonen M, Koenig W, Bjornstad O, Westfall R et al (2004) Within-population spatial synchrony in mast seeding of North American oaks. Oikos 104:156–164. doi:10.1111/j.0030-1299.2004.12722.x CrossRefGoogle Scholar
  24. Maeto K, Ozaki K (2003) Prolonged diapause of specialist seed-feeders makes predator satiation unstable in masting of Quercus crispula. Oecologia 137:392–398. doi:10.1007/s00442-003-1381-6 PubMedCrossRefGoogle Scholar
  25. Mark AF (1965a) Ecotypic differentiation in Otago populations of narrow-leaved snow tussock, Chionochloa rigida. NZ J Bot 3:277–299Google Scholar
  26. Mark AF (1965b) Flowering, seeding, and seedling establishment of narrow-leaved snow tussock, Chionochloa rigida. NZ J Bot 3:180–193Google Scholar
  27. Mark AF (1968) Factors controlling irregular flowering in four alpine species of Chionochloa. Proc NZ Ecol Soc 15:55–60Google Scholar
  28. Mark AF (1969) Ecology of snow tussocks in the mountain grasslands of New Zealand. Vegetatio 18:289–306. doi:10.1007/BF00332843 CrossRefGoogle Scholar
  29. Mark AF (1970) Floral initiation and development in New Zealand alpine plants. NZ J Bot 8:67–75Google Scholar
  30. Mark AF, Dickinson KJM (1997) New Zeland alpine ecosystems. In: Wielgolaski FE (ed) Ecosystems of the world, 3: polar and alpine tundra. Elsevier, AmsterdamGoogle Scholar
  31. Martin M, Jameson PE, Mark AF, Yeung EC, Pharis RP (1993) Early panicle development in Chionochloa macra plants induced to flower by 2, 2 dimethyl gibberellin A4 or long days. NZ J Bot 31:193–201Google Scholar
  32. McGlone MS (1989) The Polynesian settlement of New Zealand in relation to environmental and biotic changes. NZ J Ecol 12(Supplement):115–129Google Scholar
  33. McGlone MS (2001) The origin of the indigenous grasslands of southeastern South Island in relation to pre-human woody ecosystems. NZ J Ecol 25:1–15Google Scholar
  34. McKone MJ, Thom AL, Kelly D (1997) Self-compatibility in Chionochloa pallens and C. macra (Poaceae) confirmed by hand pollination of excised styles. NZ J Bot 35:259–262Google Scholar
  35. McKone MJ, Kelly D, Lee WG (1998) Effect of climate change on masting species: frequency of mass flowering and escape from specialist insect seed predators. Global Change Biol 4:591–596. doi:10.1046/j.1365-2486.1998.00172.x CrossRefGoogle Scholar
  36. McKone MJ, Kelly D, Harrison AL, Sullivan JJ, Cone AJ (2001) Biology of insects that feed in the inflorescences of Chionochloa (Poaceae) in New Zealand and their relevance to mast seeding. NZ J Zool 28:89–101Google Scholar
  37. Monks A, Kelly D (2006) Testing the resource-matching hypothesis in the mast seeding tree Nothofagus truncata (Fagaceae). Austral Ecol 31:366–375. doi:10.1111/j.1442-9993.2006.01565.x CrossRefGoogle Scholar
  38. Nilsson SG, Wästljung U (1987) Seed predation and cross-pollination in mast-seeding beech (Fagus sylvatica) patches. Ecology 68:260–265. doi:10.2307/1939256 CrossRefGoogle Scholar
  39. Norton DA, Kelly D (1988) Mast seeding over 33 years by Dacrydium cupressinum Lamb. (rimu) (Podocarpaceae) in New Zealand: the importance of economies of scale. Funct Ecol 2:399–408. doi:10.2307/2389413 CrossRefGoogle Scholar
  40. Ogden J, Basher L, McGlone MS (1998) Fire, forest regeneration and links with early human habitation: evidence from New Zealand. Ann Bot (Lond) 81:687–696. doi:10.1006/anbo.1998.0637 CrossRefGoogle Scholar
  41. Piovesan G, Adams JM (2001) Masting behaviour in beech: linking reproduction and climatic variation. Can J Bot 79:1039–1047. doi:10.1139/cjb-79-9-1039 CrossRefGoogle Scholar
  42. R Development Core Team (2005) R: a language and environment for statistical computing. Version 2.1.1. R Foundation for Statistical Computing, ViennaGoogle Scholar
  43. Rees M, Kelly D, Bjornstad O (2002) Snow tussocks, chaos, and the evolution of mast seeding. Am Nat 160:44–59. doi:10.1086/340603 PubMedCrossRefGoogle Scholar
  44. Reid DM, Beall F, Pharis RP (1991) Responses to environment: environmental cues in plant growth and development. In: Bidwell RGS, Stewart FC (eds) Plant physiology: a treatise: growth and development, vol X. Academic, San DiegoGoogle Scholar
  45. Richardson SJ, Allen RB, Whitehead D, Carswell FE, Ruscoe WA, Platt KH (2005) Climate and net carbon availability determine temporal patterns of seed production by Nothofagus. Ecology 86:972–981. doi:10.1890/04-0863 CrossRefGoogle Scholar
  46. Schauber EM, Kelly D, Turchin P, Simon C, Lee WG, Allen RB et al (2002) Masting by eighteen New Zealand plant species: the role of temperature as a synchronizing cue. Ecology 83:1214–1225CrossRefGoogle Scholar
  47. Selås V, Piovesan G, Adams JM, Bernabei M (2002) Climatic factors controlling reproduction and growth of Norway spruce in southern Norway. Can J Res 32:217–225. doi:10.1139/x01-192 CrossRefGoogle Scholar
  48. Sork VL, Bramble JE (1993) Prediction of acorn crops in three species of North American oaks: Quercus alba, Q. rubra and Q. velutina. Ann Sci For 50:128s–136s. doi:10.1051/forest:19930712 CrossRefGoogle Scholar
  49. Sullivan JJ, Kelly D (2000) Why is mast seeding in Chionochloa rubra (Poaceae) most extreme where seed predation is lowest? NZ J Bot 38:221–233Google Scholar
  50. Tisch PA, Kelly D (1998) Can wind pollination provide a selective benefit to mast seeding? Chionochloa macra (Poaceae) at Mt Hutt, New Zealand. NZ J Bot 36:637–643Google Scholar
  51. Webb CJ, Kelly D (1993) The reproductive biology of the New Zealand flora. Trends Ecol Evol 8:442–447. doi:10.1016/0169-5347(93)90007-C CrossRefGoogle Scholar
  52. White EG (1975) An investigation and survey of insect damage affecting Chionochloa seed production in some alpine tussock grasslands. NZ J Agric Res 18:163–178Google Scholar
  53. White TCR (2007) Mast seeding and mammal breeding: can a bonanza food supply be anticipated? NZ J Zool 34:179–183Google Scholar
  54. Williamson GB, Ickes K (2002) Mast fruiting and ENSO cycles: does the cue betray a cause? Oikos 97:459–461. doi:10.1034/j.1600-0706.2002.970317.x CrossRefGoogle Scholar
  55. Wilson PR, Karl BJ, Toft RJ, Beggs JR, Taylor RH (1998) The role of introduced predators and competitors in the decline of kaka (Nestor meridionalis) populations in New Zealand. Biol Conserv 83:175–185. doi:10.1016/S0006-3207(97)00055-4 CrossRefGoogle Scholar

Copyright information

© The Society of Population Ecology and Springer 2008

Authors and Affiliations

  • Dave Kelly
    • 1
  • Matthew H. Turnbull
    • 1
  • Richard P. Pharis
    • 1
    • 2
  • Michal S. Sarfati
    • 1
  1. 1.School of Biological SciencesUniversity of CanterburyChristchurchNew Zealand
  2. 2.Biological SciencesUniversity of CalgaryCalgaryCanada

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