+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

A novel in situ respirometer for investigating photosynthesis and calcification in crustose coralline algae

, : A novel in situ respirometer for investigating photosynthesis and calcification in crustose coralline algae. Journal of Experimental Marine Biology & Ecology 141(1): 15-30

This communication describes a novel respirometer for measuring the metabolism in situ of encrusting coralline algae and it provides an example of the data which can be gathered. The respirometer includes a pair of UV-transparent electrode chambers: one accommodates the specimen, the other contains a light sensor. Oxygen, pH and temperature probes monitor changes in the seawater surrounding the specimen while light is recorded concurrently in the second chamber mounted adjacent. A centrifugal pump flushes the sample chamber at regular intervals during deployment. Analog signals from the probes are transmitted via underwater cables to a data-logging device contained within a submersible pressure-resistant housing. The signals are digitized, stored in RAM and later off-loaded to a shore-based microcomputer. Oxygen and pH data are converted into rates of primary production and calcification using equations associated with the alkalinity anomaly technique and expeirmentally determined values for the photosynthetic and respiratory quotients. On a clear day in May 1986, on the windward reef crest at Lizard Island, Great Barrier Reef, Australia, rates of primary production and calcification were determined for a specimen of Porolithon onkodes (Heydrich) Foslie. The maximum rate of net photosynthesis was 18.9 mmol O2 .cntdot. m-2 crust surface .cntdot. h-1. The average rate of nocturnal respiration was 4.4 mmol O2 .cntdot. m-2 .cntdot. h-1. The ratio of maximum gross photosynthesis to respiration was 5.25. Using a photosynthetic quotient of 1.21, the data convert to a production rate of 1.5 g C .cntdot. m-2 .cntdot. day-1. The maximum rate of calcification during the day was 8.2 mmol CaCO3 .cntdot. m-2 h-1. At night the specimen dissolved at an average rate of 0.5 mmol CaCO3 .cntdot. m-2 .cntdot. h-1. Net calcification was estiamted to be 8.5 g CaCO3 .cntdot. m-2 day-1.


DOI: 10.1016/0022-0981(90)90154-5

Other references

Iwamoto, M.; Chin, T.; Shirozu, G.; Matsushima, T.; Yamana, H.; Hashimoto, K.; Kakegawa, T., 1984: Evaluation of radiotherapy combined with surgery for esophageal carcinoma. The role of adjuvant radiotherapy combined with surgery for esophageal carcinoma was discussed. To improve the surgical results, pre- and/or postoperative irradiation (total doses was 5000 rads) were performed. The patients with esophageal carcino...

Seil, F.J.; Johnson, M.L.; Hawkes, R., 1995: Molecular compartmentation expressed in cerebellar cultures in the absence of neuronal activity and neuron-glia interactions. The purpose of the study was to determine if zebrin compartmentation developed in permanently isolated cerebellar cultures, in the presence of agents that block neuronal activity and in the absence of myelination and astrocytic ensheathment of Pur...

Cheng, X-Ye.; Li, Y.; Zhou, J.; Shu, Y-Gang.; Li, X-Lin.; Fu, B., 2015: BRAF V600E Mutation in Chinese Patients with Langerhans Cell Histiocytosis and Its Clinical Significance. To investigate the BRAF V600E mutation in Chinese patients with langerhans cell histiocytosis (LCH) and its clinical significance. The clinical records of 50 pathology-diagnosed LCH cases were analyzed retrospectively and the Paraffin-embedded tis...

Cardoso, M.J.; Carvalho, H.W.L. de; Leal, M. de L. da S.; Santos, M.X. dos, 2003: Genetic improvement of corn cultivars CMS 47 and BR 5039 (Sao Vicente) in Mid-Northern Brazil. Results are presented of an experiment conducted on maize cultivars CMS 47 synthetic and BR 5039 to increase the frequency of favourable alleles and to obtain estimates of genotypic and phenotypic parameters.

Gevins, A., 1990: Distributed neuroelectric patterns of human neocortex during simple cognitive tasks. Progress in Brain Research 85: 337-54; Discussion 354-5

Creutz, G., 1959: Zum Verlauf der Seidenschwanzinvasion 1957-58 in Gebiet der DDR. Falke, 6: 88-93

Abrazhko, V.I.; Abrazhko, M.A., 1996: Characterization of spruce (Picea abies) seedling growth in communities of primary southern taiga forests. The main biometric indices are presented for 1- to 2-year-old seedlings of Picea abies. In primary spruce communities, these seedlings are characterized by very slow growth and small size. This results in their low competitive ability and high mor...

Saccardo, F.; Cardarelli, M.T., 2004: An ongoing Italian project on artichoke. The Italian Ministry of Agriculture and Forestry Policies (MiPAF) is presently funding for 2002-04 a national project of artichoke (Cynara cardunculus var. scolymus [C. scolymus]). The project is composed of 15 working groups located in the main a...

Barneo J.L., 1984: Molecular basis of synaptic transmission and spike generation. Acta Neurologica Scandinavica 70(3): 212-213

Chen, T.; Xue, H.; Lin, R.; Huang, Z., 2017: MiR-34c and PlncRNA1 mediated the function of intestinal epithelial barrier by regulating tight junction proteins in inflammatory bowel disease. Inflammatory bowel disease (IBD) is originated from uncontrolled inflammation, and desired methods for IBD therapy remains the main difficult. The network comprised with miRNA and lncRNA has been verified to play an important role on diverse human...