A matrix model for the population dynamics of Hyptis suaveolens, an annual weed
Keywords:
demography, disturbance, fecundity, life history traits, LTRE, seed, seed bank, sensitivity, analysis survivalAbstract
Hyptis suaveolens is a neotropical annual weed that invades savanna agricultural systems. Although fire, grazing and
soil disturbances have been proposed to cause its local dominance, these factors have not been experimentally tested. A
field experiment was carried out in a savanna in the Venezuelan Llanos. Six treatments were meant to simulate proposed
disturbances and explore underlying causes of the species’ local dominance. A matrix population model was developed
and for each treatment demographic and perturbation analyses were performed. Results indicate that population growth
rate is promoted by all simulated disturbances but fire and nearby vegetation removal, increasing with disturbance
intensity, especially under plowing. Demographic analyses show that the increase in population growth rate is mainly
due to fecundity. However, germination is the most sensitive parameter. Fire and digging produced a strong reduction
in germination, although this negative contribution is smaller than the positive contribution made by fecundity in the
digging treatment. Matrix population model analyses allowed a better understanding of the processes leading to increases
in the weed’s growth rate, and allow development of more effective control measures. Some of them include avoiding soil
disturbance and increasing control over germination. We also discuss the constraints of the developed model.
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Copyright (c) 2009 T. Schwarzkopf, M.C. Trevisan, J. F. Silva (Autor/a)
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