Responses of four Indo-West Pacific seagrass species to shading

Collier, Catherine J., Waycott, Michelle, and Ospina, Ana Giraldo (2012) Responses of four Indo-West Pacific seagrass species to shading. Marine Pollution Bulletin, 65 (4-9). pp. 342-354.

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Seagrasses of the Great Barrier Reef predominantly occur in coastal regions where terrestrial inputs modify water quality and photosynthetic light is highly variable. Responses to shading were tested for Cymodocea serrulata, Halodule uninervis, Thalassia hemprichii and Zostera muelleri. In aquaria, four light treatments – high (66% surface light), moderate (31%), low (14%) and very low light (1%) treatments – were applied for 102 d. Stress responses in the low and very low light treatments occurred in the following sequence: metabolic and physiological changes (reduced growth, increased pigment concentrations and photosynthetic efficiency); shedding (leaf loss, shoot loss) and production of new, altered tissue (leaves with reduced length, width and thickness). Complete shoot loss was projected after 76 (Z. muelleri) to 130 d (T. hemprichii). Responses were slower in the low than in the very low treatment, therefore, efforts to minimize water quality degradation will be rewarded with delayed impacts to seagrasses.

Item ID: 18590
Item Type: Article (Research - C1)
ISSN: 1879-3363
Keywords: shading; water quality; Great Barrier Reef; monitoring; submerged aquatic vegetation (SAV)
Date Deposited: 06 Oct 2011 06:39
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 50%
06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060701 Phycology (incl Marine Grasses) @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960802 Coastal and Estuarine Flora, Fauna and Biodiversity @ 40%
96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments @ 60%
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