Publication Date:
2024-03-15
Description:
Myora Springs is one of many groundwater discharge sites on North Stradbroke Island (Queensland, Australia). Here spring waters emerge from wetland forests to join Moreton Bay, mixing with seawater over seagrass meadows dominated by eelgrass, Zostera muelleri. We sought to determine how low pH / high CO2 conditions near the spring affect these plants and their interactions with the black rabbitfish (Siganus fuscescens), a co-occurring grazer. In paired-choice feeding trials S. fuscescens preferentially consumed Z. muelleri shoots collected nearest to Myora Springs. Proximity to the spring did not significantly alter the carbon and nitrogen contents of seagrass tissues but did result in the extraordinary loss of soluble phenolics, including Folin-reactive phenolics, condensed tannins, and phenolic acids by ?87%. Conversely, seagrass lignin contents were, in this and related experiments, unaffected or increased, suggesting a shift in secondary metabolism away from the production of soluble, but not insoluble, (poly)phenolics. We suggest that groundwater discharge sites such as Myora Springs, and other sites characterized by low pH, are likely to be popular feeding grounds for seagrass grazers seeking to reduce their exposure to soluble phenolics.
Keywords:
Aeolian_archipelago; Alkalinity, total; Alkalinity, total, standard error; Aragonite saturation state; Benthos; Bicarbonate ion; Biomass/Abundance/Elemental composition; Caffeic acid; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, total; Carbon/Nitrogen ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Containers and aquaria (20-1000 L or 〈 1 m**2); Cymodocea nodosa; Distance; Event label; EXP; Experiment; Field experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gallic acid; Identification; Lignin; Location; Macroalgae; Nitrogen, standard error; Nitrogen, total; Nitrogen in nitrate; Nitrogen in nitrate, standard error; Nitrogen in nitrite; Nitrogen in nitrite, standard error; Nitrogen in nitrite + nitrate; Nitrogen in nitrite + nitrate, standard error; North_Stradbroke_Island; OA-ICC; Ocean Acidification International Coordination Centre; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error; pH; pH, standard error; Phenolics, reactive, total; Plantae; Proanthocyanidins; Proteins; Rosmarinic acid; Ruppia maritima; Salinity; Salinity, standard error; Single species; South Pacific; Species; St_Mary_River; Starch; Sugars; Sulfate; Sulfate, standard error; Temperate; Temperature, water; Temperature, water, standard error; Tracheophyta; Zostera muelleri; δ13C; δ15N
Type:
Dataset
Format:
text/tab-separated-values, 2473 data points
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