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    • Journal of Range Management, Volume 49 (1996)
    • Journal of Range Management, Volume 49, Number 2 (March 1996)
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    Importance of predation and germination on losses from the seed bank of calden (Prosopis caldenia)

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    Author
    Lerner, P.
    Peinetti, R.
    Issue Date
    1996-03-01
    Keywords
    seed longevity
    seed banks
    Prosopis
    savanna woodlands
    Bruchidae
    seed predation
    ambient temperature
    rain
    seed germination
    Argentina
    
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    Citation
    Lerner, P., & Peinetti, R. (1996). Importance of predation and germination on losses from the seed bank of calden (Prosopis caldenia). Journal of Range Management, 49(2), 147-150.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644270
    DOI
    10.2307/4002685
    Additional Links
    https://rangelands.org/
    Abstract
    Caldén (Prosopis caldenia) seeds not dispersed by animals sometimes constitute a considerable number of seeds to the seed bank which may contribute to the species' dissemination. The monthly change in the number of viable non-animal dispersed seeds was evaluated over a one-year period. We determined the percentage germination of seeds and the amount of predation by bruchid beetles to learn how these factors influence seed longevity. Forty eight bags containing 10 fruits were placed in 4 sites below caldén tree canopies at the time of shedding (March). To monitor seed losses we randomly removed 1 bag per site every 25-35 days during a year. At the time of shedding, fruits contained 29 seeds, 73 +/- 5.0% which were viable and 9 +/- 2.2% attacked by bruchids. Viability decreased to 33 +/- 22.3% one year later. Loss of viability was described by a polynomial quadratic (y = 70.12 + 0.0238 t-0.0004 t2 (r2= 0.62)). Bags with germinated seeds were observed beginning in November. Percentage germinated seed increased 4.8 +/- 3.7% in the last month of sampling. Consumption of seeds by bruchids also increased in November, but the effect was highly variable. In the last month of sampling (March in the following year), 35 +/- 18.0% of seeds were affected by bruchids. A predictive seed longevity model was developed considering climatic variables, but data were well described only until January (y = 81.50-0.097 time-3.94 precipitation (r2= 0.66)). Undispersed seeds had a high rate of decay and low germination. Longevity was strongly affected by bruchid attack.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002685
    Scopus Count
    Collections
    Journal of Range Management, Volume 49, Number 2 (March 1996)

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