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Over de populatiebiologie van Agrostis stolonifera L. IV: Relatieve groeisnelheid

Jongman, M. (1984) Over de populatiebiologie van Agrostis stolonifera L. IV: Relatieve groeisnelheid. Master's Thesis / Essay, Biology.

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Main purpose of this experiment was to reveal existing variation in relative growth rate (RGR) within and between three natural populations of Agrostis stolonifera L. and the influence of Nitrogen on this variation. The three populations were from different sites: a) a beach-plain population, where nutrient stress and drought are thought to be the main selecting forces, b) BV459, an old meadow population, where competition probably is the main selecting force, and c) LZP2, a colonizing population in a site with probably relative low forces of selection. Stolen dry weight of 20 individuals per population was measured after 0, 2,4 and 6 of growth in a controlled environment, at two N-levels. Individual RGR' s were obtained through linear regression. A relationship was found between individual dry weight at t=C and individual RGR; therefore a correction was made. At low N-level, the S- and the LZP2 population grew significantly slower (p<0.001) than the BV459-populatiOn, with no significant differences in variances. At high N-level, all three populations differed significantly in their growth rates: the S-population grew slower(P<0.001) than the LZF2_population, which grew slower(P<0.05)than BV459. The variance of LZP2 was significant higher (P<0.01) than that of BV459, and nearly significant higher than that of S. Significant differences within the LZP2_population on high N-level at first was detected: because of the relationship between initial dry weight and RGR however, this result is no real evidence for existing intra-population-differentiation Individuals from BV459 and LZP2 seemed to differ more in their plasticity than did individuals from S. Overall, the results may indicate that under conditions of nutrient stress(S) selection favours a slow growth-reaction in response of a temporarily higher nutrient availability: the surplus of nutrients then may be used for storage or other adaptations to the specific stress situation. Under stable, highly productive conditions(BV459),selection will favour fast growth, at least in the early stage of plant- development. Finally, the results show no evidence for strong selecting forces in LZP2.

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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