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- W2324363209 abstract "1 Hylocomium splendens is a perennial clonal moss with annual periodicity in the emergence of new modules. New growing points usually emerge in spring and develop into mature segments their second summer. Population increase is brought about by ramification (branching) of the youngest segment or by regeneration from older parts of the shoot system. 2 A technique for nondestructive re-identification of segments in permanent plots is devised. Precise demographic information on 9206 growing points and 7602 mature segments was obtained by following 119 local populations in seven Norwegian reference areas for monitoring during 3 years. The dry weight of each mature segment was estimated from morphological field measurements. 3 The potential of each mature segment for production of new growing points was strongly size-dependent; c. 40% of the variation in a segment's size was explained by the size of its mother segment. Integration within segment chains was largely restricted to neighbouring segments. The number offspring growing points (by ramification as well as regeneration) was positively size-dependent, while termination risk was negatively size-dependent. Mature segments produced by regeneration were smaller, while segments produced by ramification were larger than the average segment. Strong apical dominance was demonstrated. 4 Mortality and branching rates, averaged over populations, areas and years, are reported. Annual recruitment was 32.3%; 23.3% by regeneration, 7.5% by ramification, and 1.5% by accidentally introduced shoots. Annual mortality was 19.7%. 6.8% by loss, 1.9% by grazing, and 1 1.0% by termination for other reasons. 5 Demographic data for growing points and mature segments were analysed separately by stage-structured transition matrix models. The total population increased every year (average A = 1.10-1.11). Vital rates were strongly size-dependent. The contributions of ramification and regeneration to increase in i were equal as ramification occurred in large segments with high probability for survival. 6 Ramification is considered important for maintenance of size and risk-spreading among ramets under favourable conditions, while high regenerative ability facilitates resilience to, and recovery after, disturbance. The ecological significance of size is discussed. 7 Hylocomium splendens is closely similar to clonal forest vascular plants in major demographic traits, e.g. size-dependence of fitness and branching patterns." @default.
- W2324363209 created "2016-06-24" @default.
- W2324363209 creator A5017176609 @default.
- W2324363209 date "1995-08-01" @default.
- W2324363209 modified "2023-10-11" @default.
- W2324363209 title "Population Biology of the Clonal Moss Hylocomium Splendens in Norwegian Boreal Spruce Forests. I. Demography" @default.
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- W2324363209 doi "https://doi.org/10.2307/2261637" @default.
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