NDLI: Reproductive allocation of Carex flava reacts differently to competition and resources in a designed plant mixture of five species

Content Provider	Springer Nature Link
Author	Suter, Matthias
Copyright Year	2008
Abstract	In natural plant communities, reproductive allocation can be affected by complex interactions among abiotic resources, species competition and plant size. This topic was addressed using a variety of designed mixed stands of five species (Carex elata, Carex flava, Lycopus europaeus, Lysimachia vulgaris and Mentha aquatica) under four abiotic conditions to investigate how competition and abiotic resources influence the reproductive allocation of one of the five species, C. flava. The plant mixtures varied systematically in both the relative abundance of the five species and the absolute density, and were each established with two levels of water and nutrients. In total, 176 mixtures were maintained for two growing seasons in large pots in an experimental garden. Reproductive allocation of C. flava increased from 6.8% to 9.7% under high nutrient application; however, for both nutrient levels, reproductive allocation was independent of shoot mass (size-independent allocation). Under low competition, reproductive allocation of C. flava decreased as its shoot mass increased, indicating a relatively high investment in vegetative structures under higher light availability. However, under strong competition, the allocation pattern changed and a constant reproductive allocation for different plant sizes was observed. Different water levels did not influence the shoot mass, seed mass or reproductive allocation of C. flava, indicating that the species was not stressed under dryer conditions. When under competitive pressure, however, the species responded with reduced shoot and seed production under more favourable water conditions. This behaviour indicates a trade-off between the ability to tolerate stress and the competitive and reproductive response of C. flava. In conclusion, C. flava was adversely affected by competition with some of the species, and competition, mediated by plant size, indirectly affected reproductive allocation. C. flava was able to modify its allocation pattern depending on the available resources and retained its reproductive allocation even under unfavourable conditions for varying plant sizes, which is interpreted as an advantageous reaction to greater competition pressure.
Starting Page	481
Ending Page	489
Page Count	9
File Format	PDF
ISSN	13850237
Journal	Plant Ecology
Volume Number	201
Issue Number	2
e-ISSN	15735052
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-09-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fen meadow species Nutrient water supply Simplex design Stress tolerance Trade-off Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science

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