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  • Root allocation  (1)
  • ecological model system  (1)
  • Springer  (2)
  • American Chemical Society
  • 1995-1999  (2)
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  • Springer  (2)
  • American Chemical Society
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  • 1995-1999  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Responses of a small mammal community to heterogeneity along forest-old-field edges (1999)
    Springer
    Landscape ecology 14 (1999), S. 355-367 
    Details
    ISSN: 1572-9761
    Keywords: Blarina brevicauda ; competition ; ecological model system ; ecotones edge effects ; forest edge ; macrohabitat ; microhabitat ; Microtus pennsylvanicus ; old-field ; Peromyscus leucopus ; predation ; seed predation ; seedling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Despite the importance of edges effects in ecological systems, the causes and consequences of animal responses to habitat edges are largely unknown. We used three years of live-trapping and measures of the plant community around trap stations to explore the responses of white-footed mice (Peromyscus leucopus), meadow voles (Microtus pennsylvanicus), and short-tailed shrews (Blarina brevicauda) to forest-field edges in upstate New York. We found that capture probabilities of voles were highest in grass- and forb-dominated micro-habitats and in old-field zones distant from the forest edge. In contrast, capture probabilities of white-footed mice were highest in shrub-dominated microhabitats and in zones near the forest edge. Short-tailed shrews did not show strong micro- or macrohabitat associations. The responses by voles, the competitive dominant in our system, to variation along forest-field edges were more consistent across years than were those of the competitively inferior, white-footed mouse. Mice were less likely to use the old-field interiors when vole density was high than when it was low, suggesting competitive displacement of mice by voles. Finally, we found good agreement between the spatial activity patterns of mice and voles in old-fields and their impacts on patterns of survival of tree seeds and seedlings in concurrent studies. These results suggest that a dynamic interaction exists between the plant and animal communities along forest edges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008093823391
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  • 2
    Electronic Resource
    Electronic Resource
    Interspecific and intraspecific variation in tree seedling survival: effects of allocation to roots versus carbohydrate reserves (1999)
    Springer
    Oecologia 121 (1999), S. 1-11 
    Details
    ISSN: 1432-1939
    Keywords: Key words Carbohydrate reserves ; Root allocation ; Tree seedling survival
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We examined interspecific and intraspecific variation in tree seedling survival as a function of allocation to carbohydrate reserves and structural root biomass. We predicted that allocation to carbohydrate reserves would vary as a function of the phenology of shoot growth, because of a hypothesized tradeoff between aboveground growth and carbohydrate storage. Intraspecific variation in levels of carbohydrate reserves was induced through experimental defoliation of naturally occurring, 2-year-old seedlings of four northeastern tree species –Acer rubrum, A. saccharum, Quercus rubra, and Prunus serotina– with shoot growth strategies that ranged from highly determinate to indeterminate. Allocation to root structural biomass varied among species and as a function of light, but did not respond to the defoliation treatments. Allocation to carbohydrate reserves varied among species, and the two species with the most determinate shoot growth patterns had the highest total mass of carbohydrate reserves, but not the highest concentrations. Both the total mass and concentrations of carbohydrate reserves were significantly reduced by defoliation. Seedling survival during the year following the defoliation treatments did not vary among species, but did vary dramatically in response to defoliation. In general, there was an approximately linear relationship between carbohydrate reserves and subsequent survival, but no clear relationship between allocation to root structural biomass and subsequent survival. Because of the disproportionate amounts of reserves stored in roots, we would have erroneously concluded that allocation to roots was significantly and positively related to seedling survival if we had failed to distinguish between reserves and structural biomass in roots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050900
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    Paper (German National Licenses)
    Fulltext
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