| ||Format||Pages||Price|| |
|PDF (140K)||10||$25||  ADD TO CART|
|Complete Source PDF (2.0M)||130||$55||  ADD TO CART|
Variance estimates are rarely reported or rigorously determined for net primary production by higher aquatic plants, yet the variance must be known before production estimates can be compared conclusively. First-order error analysis is used here to derive formulae for estimating the variance of annual net production determined by demographic methods. Demographic methods determine net production of even-aged cohorts by analyzing curves of survivorship versus plant mass (Allen curves). Allen curves may be interpolated linearly or logarithmically. Calculation formulae for both alternatives are derived and compared in a common framework. Logarithmic interpolation is more consistent with observed thinning dynamics of even-aged plant stands.
aquatic plants, demography, production rate, Allen curve, error propagation, first-order error analysis, macrophytes, self-thinning rule
Professor, University of Notre Dame, Notre Dame, IN