期刊
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
卷 22, 期 -, 页码 127-134出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.algal.2016.10.001
关键词
Polymer; Settlement; Kelp; Cultivation; Macroalga; Contact angle
资金
- European Commission Community Research and Development Information Service (CORDIS) Seventh Framework Programme (FP7) project-Advanced Textiles for Open Sea Biomass Cultivation (AT similar to SEA) grant [280860]
For the cultivation of the European phaeophyte macroalgae Laminaria digitata and Saccharina latissima, meiospores are settled onto twines within a hatchery, where they are grown for several months. The twine used is often a customarily selected synthetic polymer, polyamide or polypropylene. However, little is known about the impacts of this choice on hatchery performance. To test the effect of substrate material, we settled and cultured meiospores from both L. digitata and S. latissima, independently on twelve polymer blocks for 4 mo. They were first grown for 2 mon under laboratory conditions, then a further 2 mon in outdoor tanks. Meiospore settlement varied significantly between polymers by up to 15-fold (p<0.0001) with some speciesspecific differences also observed (p<0.0001). Tufnol was the least suitable polymer, as formaldehyde leachate reduced settlement and inhibited juvenile growth/development. After 8 wk, all polymers excluding Tufnol, were performing similarly with generally -1 mm sporophytes present at a density of 1-2 mm(-2), A negative densitydependent effect of sporophyte size and densitywas observed in both species (p<0.05). At the end of the experiment, two distinct grouping of polymers were identified regarding S. latissima. Those that initially had very high settlement (high density polyethylene, polymethyl methacrylate, polyoxymethylene copolymer/homopolymer and polytetrafluoroethylene) had the lowest final mean lengths, % cover and biomass (<0.2 g wet weight-block-1) at the end of the experiment. Conversely many of the polymers with the lowest initial settlement (polyamide, polycarbonate, medium density polyethylene and polyvinylchloride) had the highest final mean lengths, % cover and biomass (1.7-4.9 gwetweight-block(-1)). This reversal of fortunes is discussed regarding discriminatorymeiospore settlement, differences in apparent adhesion strength of the seaweed holdfast and the transition of the growing sporophytes from a viscous force dominated boundary layer environment to a turbulent dominated environment with increasing drag as the sporophyte grows. (C) 2016 Published by Elsevier B. V.
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