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Comparative demography of co-occurring introduced and native tussock grasses: persistence and potential expansion

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Summary

Demographic characteristics associated with the maintenance and growth of populations, such as seed dynamics, seedling emergence, survival, and tiller dynamics were examined for two tussock grasses, the native Agropyron spicatum and the introduced Agropyron desertorum in a 30-month field study. The introduced grass was aerially sown onto a native grassland site. Seed production of the introduced grass was greater than the native grass in both above- and below-average precipitation years. Seeds of A. spicatum were dispersed when they mature, while A. desertorum retained some seeds in inflorescences, and dispersed them slowly throughout the year. This seed retention allowed some seeds of the introduced grass to escape peak periods of seed predation during the summer and allowed seeds to be deposited constantly into the seed bank. Carryover of seeds in the seed bank beyond one year occurred in the introduced grass but not in the native species. For both species, seedling emergence occurred in both autumn or spring. Survival rates for A. desertorum were higher than A. spicatum when seedlings emerged between November and March. Survival rates of cohorts emerging before November favored A. spicatum whereas survival rates did not differ between species for cohorts emerging after March. Individuals of both species emerging after April were unable to survive the summer drought. Demographic factors associated with seeds of A. desertorum seemed to favor the maintenance and spread of this introduced grass into native stands formerly dominated by A. spicatum.

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References

  • ASCS-Agricultural Stabilization and Conservation Service (1988) The conservation reserve program: progress report and preliminary evaluation of the first two years. USDA, ASCS, Washington, DC

    Google Scholar 

  • Baker HG (1965) Characteristics and modes of origin of weeds. In: Baker HG, Stebbins GL (eds) The genetics of colonizing species. Academic Press, New York, USA, pp 147–168

    Google Scholar 

  • Barkworth ME, Dewey DR (1985) Genomically based genera in the perennial Triticeae of North America: identification and membership. Am J Bot 72: 767–776

    Google Scholar 

  • Bazzaz FA (1986) Life history of colonizing plants: some demographic, genetic, and physiological features. In: Mooney HA, Drake JA (eds) Ecology of biological invassions of North America and Hawaii. Springer, Berlin Heidelberg New Yor, USA, pp 96–110

    Google Scholar 

  • Brown JH, Reichman OJ, Davidson DW (1979) Granivory in desert ecosystems. Ann Rev Ecol Syst 10: 201–227

    Google Scholar 

  • Coffin DP, Lauenroth WK (1989) Spatial and temporal variation in the seed bank of a semiarid grassland. Am J Bot 76: 53–58

    Google Scholar 

  • Cook RE (1979) Patterns of juvenile mortality and recruitment in plants. In: Solbrig O, Jain S, Johnson G, Raven P (eds) Topics in plant population biology, Columbia Univ Press, New York, pp 207–231

    Google Scholar 

  • Daubenmire R (1959) A canopy-coverage method of vegetational analysis. Northwest Sci 33: 43–64

    Google Scholar 

  • Daubenmire R (1978) Plant geography. Academic Press, New York, USA

    Google Scholar 

  • Dillman A (1946) The beginnings of crested wheatgrass in North America. J Am Soc Agron 28: 237–250

    Google Scholar 

  • Eissenstat DM (1986) Belowground resource exploitation in semiarid plants: A comparative study using two tussock grasses that differ in competitive ability. PhD Dissertation, Utah State Univ, Logan, UT, USA

  • Eissenstat DM, Caldwell MM (1988) Competitive ability is linked to rates of water extraction. A field study of two aridland tussock grasses. Oecologia 75: 1–7

    Google Scholar 

  • Fienberg SE (1980) The analysis of cross-classified categorical data. MIT Press, Cambridge, MA, USA

    Google Scholar 

  • Harris GA (1967) Some competitive relationships between Agropyron spicatum and Bromus tectorum. Ecol Monog 37: 89–111

    Google Scholar 

  • Harris GA, Wilson AM (1970) Competition for moisture among seedlings of annual and perennial grasses as influenced by root elongation at low temperature. Ecology 51: 530–534

    Google Scholar 

  • Hironaka M, Fosberg MA, Winward AH (1983) Sagebrush-grass habitat types of southern Idaho. Forest, Wildlife, and Range Exp Sta, University of Idaho, Moscow, USA

    Google Scholar 

  • Hull AC Jr (1971) Grass mixtures for seeding sagebrush lands. J Range Manage 24: 150–152

    Google Scholar 

  • Hull AC Jr, Klomp GJ (1966) Longevity of crested wheatgrass in the sagebrush-grass type in southern Idaho. J Range Manage 19: 5–11

    Google Scholar 

  • Hull AC Jr, Klomp GJ (1967) Thickening and spread of crested wheatgrass stands on southern Idaho ranges. J Range Manage 20: 222–227

    Google Scholar 

  • Johnson DA (1986) Seed and seedling relations of crested wheatgrass: a review. In: Johnson KL (ed) Crested wheatgrass: its values, problems and myths; symposium proceedings. Utah State Univ, Logan, UT, USA pp 65–90

    Google Scholar 

  • Looman J, Heinrichs DH (1973) Stability of crested wheatgrass pastures under long-term pasture use. Can J Plant Sci 53: 501–506

    Google Scholar 

  • Mack RN, Pyke DA (1983) The demography of Bromus tectorum: variation in time and space. J Ecol 71: 69–93

    Google Scholar 

  • Mack RN, Thompson JN (1982) Evolution in steppe with few large, hooved mammals. Am Nat 119: 757–773

    Google Scholar 

  • Marlette GM, Anderson JE (1986) Seed banks and propagule dispersal in crested-wheatgrass stands. J Appl Ecol 23: 161–175

    Google Scholar 

  • Miller TE (1987) Effects of emergence time on survival and growth in an early old-field plant community. Oecologia 72: 272–278

    Google Scholar 

  • Pratt DW, Black RA, Zamora BA (1984) Buried viable seed in a ponderosa pine community. Can J Bot 62: 44–52

    Google Scholar 

  • Pyke DA (1986) Demographic responses of Bromus tectorum and seedlings of Agropyron spicatum to grazing by small mammals: occurrence and severity of grazing. J Ecol 74: 739–754

    Google Scholar 

  • Pyke DA, Thompson JN (1986) Statistical analysis of survival and removal rate experiments. Ecology 67: 240–245

    Google Scholar 

  • Richards JH, Caldwell MM (1985) Soluble carbohydrates, concurent photosynthesis and efficiency in regrowth following defoliation: A field study with Agropyron species. J Appl Ecol 22: 907–920

    Google Scholar 

  • Roberts HA (1981) Seed banks in soils. Adv Appl Biol 6: 1–55

    Google Scholar 

  • Rogler GA, Lorenz RL (1983) Crested wheatgrass-early history in the United States. J Range Manage 36: 91–93

    Google Scholar 

  • Salihi DO, Norton BE (1987) Survival of perennial grass seedlings under intensive grazing in semi-arid rangelands. J Appl Ecol 24: 145–151

    Google Scholar 

  • Stanton ML (1985) Seed size and emergence time within a stand of wild radish (Raphanus raphanistrum L.): the establishment of a fitness hierarchy. Oecologia 67: 524–531

    Google Scholar 

  • Symonides E (1979) The structure and population dynamics of psammophytes on inland dunes. I. Population of initial stages. Ekol Polska 27: 3–37

    Google Scholar 

  • Thompson K, Grime JP (1979) Seasonal variation in the seed banks of herbaceous species in ten contrasting habitats. J Ecol 67: 893–921

    Google Scholar 

  • Vallentine JF (1980) Range development and improvements (2nd edition). Brigham Young Univ Press, Provo, UT, USA

    Google Scholar 

  • Weintraub F (1953) Grasses introduced into the United States. USDA Agriculture Handbook 58

  • Werner PA (1975) Prediction of fate from rosette size in teasel (Dipsacus fullonum L.). Oecologia 20: 197–201

    Google Scholar 

  • West NE (1983a) Great Basin-Colorado Plateau sagebrush semidesert. In: West NE (ed) Temperate deserts and semi-deserts. Elsevier Sci Publ, Amsterdam, The Netherlands, pp 331–349

    Google Scholar 

  • West NE (1983b) Western intermountain sagebrush steppe. In: West NE (ed) Temperate deserts and semi-deserts. Elsevier Sci Publ, Amsterdam, The Netherlands, pp 351–374

    Google Scholar 

  • Young JA, Evans RA (1986) History of crested wheatgrass in the intermountain area. In: Johnson KL (ed) Crested wheatgrass: its values, problems and myths; symposium proceedings. Utah State Univ, Logan, UT, USA, pp 21–25

    Google Scholar 

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Pyke, D.A. Comparative demography of co-occurring introduced and native tussock grasses: persistence and potential expansion. Oecologia 82, 537–543 (1990). https://doi.org/10.1007/BF00319798

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