Analysing time series data of phenotypic measurements - trade-off in sexual reproduction and vegetative growth of perennial ryegrass (<i>Lolium perenne</i>)?
2012
Thiele, J. | Markussen, B.
In this example, we analyse repeated phenotypic measurements of perennial ryegrass (<i>Lolium perenne</i>) from a greenhouse experiment. We hypothesize that there is a trade-off between sexual reproduction (flower stems) and vegetative propagation (tillers) within polycormons of this species. This is not directly a study of biological invasions; however, we want to find out, if fewer flowering plants (cultivars, in this case) would be more competitive and could invade seminatural grasslands. Similar repeated measures are quite often used in invasion biology. Sexual reproduction or, more precisely, the degree of flowering of the plants, was modified by cold treatments (vernalization). Cold temperature (<6°C) is a prerequisite for flowering of perennial ryegrass. The shorter the cold period, the lower the number of flowering stems that emerge afterwards. In this way, plants (polycormons) of perennial ryegrass with varying numbers of flowering stems were produced, species This forms Supplement D to Thiele J, Markussen B. Potential of GLMM in modelling invasive spread.
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