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Este artículo contiene 15 páginas, 6 figuras, 4 tablas.Seagrass meadows provide crucial ecosystem services to the coastal zone but are\udthreatened globally. Seagrass loss to date has mainly been attributed to anthropogenic activities that\udreduce light quantity (amount of photosynthetic photon flux density), such as dredging, flooding and\udeutrophication. However, light quality (wavelengths of light within the visible spectrum) is also\udaltered by these anthropogenic stressors. This study addressed the effect of light quality changes on\udseagrasses. Aquarium-based experiments were conducted to determine whether the seagrass\udHalophila ovalis (R.Br.) Hook f. responds to different light quality treatments. Separate experiments\udwere performed in which adults, seeds or seedlings were subjected to monochromatic light treatments\udin the blue (peak λ = 451 nm), green (peak λ = 522 nm), yellow (peak λ = 596 nm) and red (peak\udλ = 673 nm) wavelengths with a control of full-spectrum light (λ = 400 − 700 nm, at 200 µmol photons\udm−2 s−1). This study is unique in that it measured seagrass responses to light across several plant\udscales (physiology, productivity, morphology and biomass) as well as across life-history stages (seeds,\udseedlings, adults and flowering). Adult plants responded differently to seeds and seedlings but were\udgenerally consistent with terrestrial angiosperms: blue light decreased below-ground productivity;\udgreen light influenced morphology (through increased rhizome internode length); red light en -\udhanced seed germination and survival. The findings indicate that both natural and human-induced\udchanges in light quality could significantly affect seagrass growth and reproduction. As a range of\udanthropogenic activities are currently contributing to the global losses of seagrasses, this research\udprovides timely information on how light quality influences different seagrass life history stages.This research was partially funded\udby the Western Australian Marine Science Institute and\udthrough the Australian Commonwealth Government’s Collaborative\udResearch networks scheme (Grant CRN2011:05)\udand the School of Sciences, Edith Cowan University.Peer reviewe

Seagrass Halophila ovalis is affected by light quality across different life history stages