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The effects of nutrient pulsing on the threatened, floodplain species, Boltonia decurrens

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Abstract

Prior to anthropogenic disturbance, the floodplains of the Illinois River (USA) experienced moderate, cyclical flooding; a phenomenon termed a 'flood pulse'. Significant changes in the hydrology of the Illinois River caused by human alteration of the river channel resulted in a decline in populations of Boltonia decurrens, a native, herbaceous floodplain species of the Illinois River Valley and the demography of the species and underlying mechanisms causing the severe decline of B. decurrens are currently being studied. One component of the river flood pulse is the increased availability of nutrients in floodplain soils. We studied the effects of increased nutrient availability on growth and reproduction of B. decurrens and Aster pilosus, a species replacing B. decurrens in the floodplain. In this study, we examined the effects of a spring nutrient pulse and a late summer nutrient pulse, as compared to a control treatment, on rosettes of B. decurrens and A. pilosus grown in three soil types: sandy loam, silty loam and clay. Biomass, plant height, inflorescences per plant, seed production, and seed mass were measured and compared. Individuals of B. decurrens grown in sandy loam, the predominant soil type of the Illinois River Valley, had thegreatest increase in growth and fecundity in response to nutrient pulsing. Total biomass and inflorescences per plant were significantly greater than the control regardless of the timing of the nutrient pulse. Aster pilosus did not exhibit a clear pattern of increased growth and fecundity in a specific soil type or pulse treatment. The early pulse treatment appeared to have a greater effect across the range of soil types than the late pulse treatment; however, it did not seem to influence any particular variable(s) that we measured. A pulse of nutrients benefits B. decurrens more than A. pilosus, particularly in sandy loam. The increased vigor and fecundity of B. decurrens with a nutrient pulse could be a factor contributing to population survival during the period between disturbance events.

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Authors and Affiliations

  1. Department of Biological Sciences, Southern Illinois University, Edwardsville, IL, 62026, USA

    Paige A. Mettler, Marian Smith & Kelly Victory

  2. Department of Plant Biology, Southern Illinois University, Carbondale, IL, 62901, USA

    Paige A. Mettler

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  1. Paige A. Mettler
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  2. Marian Smith
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  3. Kelly Victory
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Mettler, P.A., Smith, M. & Victory, K. The effects of nutrient pulsing on the threatened, floodplain species, Boltonia decurrens. Plant Ecology 155, 91–98 (2001). https://doi.org/10.1023/A:1013267121292

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