Biomass, nitrogen, and phosphorus allocation in parrotfeather (Myriophyllum aquaticum)

Seasonal patterns in allocation of biomass, nitrogen, and phosphorus in parrotfeather, Myriophyllum aquaticum (Vell.) Verd., were determined in a north-central California lake. Submersed rhizomes comprised 72 to 98% of the total biomass. Emergent biomass never comprised more than 24% of the total bi...

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Published in:Journal of aquatic plant management 1993-07, Vol.31, p.244-248
Main Authors: Sytsma, MD, Anderson, LWJ
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Language:English
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Freshwater
Myriophyllum aquaticum
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description Seasonal patterns in allocation of biomass, nitrogen, and phosphorus in parrotfeather, Myriophyllum aquaticum (Vell.) Verd., were determined in a north-central California lake. Submersed rhizomes comprised 72 to 98% of the total biomass. Emergent biomass never comprised more than 24% of the total biomass. Allocation to emergent biomass was greater in shallow (
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Verd., were determined in a north-central California lake. Submersed rhizomes comprised 72 to 98% of the total biomass. Emergent biomass never comprised more than 24% of the total biomass. Allocation to emergent biomass was greater in shallow (&lt;0.5 m) than in deep (0.5-1.5 m) sites on the dates sampled. The submersed growth form was an important component of the biomass only during winter when it accounted for a maximum of 3% of the biomass. There was no accumulation of biomass between June and September 1989, which suggests that biomass loss rates equalled production rates during the growing season. Rhizome N concentration, but not P or C concentrations, increased during the growing season. Allocation of N and P in parrotfeather varied with season and depth. Rhizomes contained 42 to 89% of the total N pool. The proportion of N in emergent tissues from deep plots decreased from 30% in June to &lt;10% in September. Rhizomes contained only 3% of the total P pool, 80% of the parrotfeather P was in emergent tissues. Parrotfeather appeared to rely upon current uptake of P for growth rather than on stored P, which suggests that reduction in P supply may effectively reduce growth, and may partially explain the limited distribution of parrotfeather and its lack of aggressive invasion of aquatic macrophyte communities in some areas. 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title Biomass, nitrogen, and phosphorus allocation in parrotfeather (Myriophyllum aquaticum)
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