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Primary Production and Calcification Rates of Algae‐Dominated Reef Flat and Seagrass Communities
Author(s) -
Perez D. I.,
Phinn S. R.,
Roelfsema C. M.,
Shaw E.,
Johnston L.,
Iguel J.
Publication year - 2018
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
eISSN - 2169-8961
pISSN - 2169-8953
DOI - 10.1029/2017jg004241
Subject(s) - reef , seagrass , productivity , oceanography , coral reef , bay , fringing reef , environmental science , fishery , algae , geology , ecology , habitat , biology , macroeconomics , economics
Monitoring variability in coral reef primary production and calcification is needed to understand changes over time and between reef systems, which helps separate differences due to natural and/or anthropogenic factors happening now and in the future. This study measured net productivity and calcification for two reef systems at Shark Bay, Heron Reef in the southern Great Barrier Reef and Saipan Lagoon, Commonwealth of the Northern Mariana Islands. Net primary productivity and calcification were strongly correlated for reef flats with an adjusted R 2 = 0.66. Night time dissolution occurred at Shark Bay reef flat with an average of −12.66 mmol CaCO 3 · m −2 · hr −1 , while calcification increased at night for the Saipan reef flat. For both reef flat sites, net productivity from oxygen flux was much lower than rates calculated from change in dissolved inorganic carbon. This study provided the first baseline estimates of net productivity and calcification for a reef flat and seagrass community in Saipan Lagoon. The seagrass community had the lowest productivity of all sites. However, the high presence of calcareous algae at the site highlights the need for more research on the carbonate chemistry of these habitats. All sites had high net productivity that was most likely associated with the dominant presence of algae.