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Over de Populatiebiologie van Agrostis stolonifera L. : Strategie en Polyploïdie

Kruijer, J.D. (1983) Over de Populatiebiologie van Agrostis stolonifera L. : Strategie en Polyploïdie. Master's Thesis / Essay, Biology.

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Populations of Agrostis stolonifera from the saltmarsh and old pastures were studied for life-history strategies as described in the r- and K—theory (MacArthur & Wilson,1967;Gadgil & Solbrig, 1972). Samples from these populations were studied in a "Random Block Design" ( Little & Jackson Hills, 1978) especially for the shoot biomass production and the number of tillers per plant. Also the distribution of the tetraploid,the pentaploid and the hexaploid in the sampled populations were recorded.Björkman (1954) showed the existance of the pentaploid and hexaploid in rather large numbers compared with the normal allotetraploid. The competition characters of the saltmarsh- and old pasture populations were tested in Mix-compared with Monocultures. The common nature of the hybrid A.tenuis x stolonifera in A, stolonifera populations was shown. Aston (1962) and Bradshaw (1958, 1975 ) have given the same result for pasture populations. In the saltmarsh—populations different colourtypes were noticed: glauc and green. The green plants showed much less variation as the glauc ones did. It is suggested that the green plants in the saltmarsh are slightly more r—selected types as the glauc ones are. It is concluded there is too little information about A. stolonifera to arrange the results of the studied saltmarsh and pasture populations in the predictions by the r— and K—theory. In the old pasture populations 15 tetraploids, 7 pentaploids and 2 hexaploids were found, in the saltmarsh 1 pentaploid on a total of 21 plants. No morfological differences can be made sure between the different polyploids. The shown nichedifferentiation between saltmarsh and pasture populations can either be a result of not reaching the carrying capacity for the saltmarsh-populations and one pasture-population or the in the pastures existing hybrids or the existence of colourtypes in the saltmarsh. The pasture plants produced under the experimental environment the most biomass.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Biology
Thesis type: Master's Thesis / Essay
Language: Dutch
Date Deposited: 15 Feb 2018 07:48
Last Modified: 15 Feb 2018 07:48

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