Coulometric measurement of oxygen-consumption during development of marine invertebrate embryos and larvae

Hoegh-Guldberg, Ove and Manahan, Donal T. (1995) Coulometric measurement of oxygen-consumption during development of marine invertebrate embryos and larvae. Journal of Experimental Biology, 198 1: 19-30.

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Author Hoegh-Guldberg, Ove
Manahan, Donal T.
Title Coulometric measurement of oxygen-consumption during development of marine invertebrate embryos and larvae
Journal name Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
Publication date 1995-01
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 198
Issue 1
Start page 19
End page 30
Total pages 12
Place of publication Cambridge, United Kingdom
Publisher The Company of Biologists
Language eng
Formatted abstract
Determining the metabolic rate of larval invertebrates from aquatic habitats is complicated by the problems of small size and the scarcity of suitable measurement techniques. In this study, coulometric respirometry (a new technique for the study of marine embryos and larvae) was used to explore several issues associated with the rate of energy use during embryonic and larval development of marine invertebrates from three phyla. Coulometric respirometry measures rates of oxygen consumption under normoxic conditions by electrochemically replacing the oxygen consumed by organisms during an experiment. This technique is based on the assumption that all electrons consumed by the anodic reactions result in the production of oxygen. We verify this assumption using direct measurements of oxygen production and show that the technique is sensitive enough (1 nmol O2 h-1) to quantify the oxygen consumption of a single individual swimming freely in a relatively large volume (2 ml). Continuous measurements can span days, and embryos in the coulometric respiration chambers develop to the larval stage at normal rates of differentiation. Measurements of metabolic rates were made with the coulometric respirometer during the complete life-span of larvae of three species (asteroid, Asterina miniata; bivalve, Crassostrea gigas; echinoid, Dendraster excentricus). For these species, metabolic power equations had mass exponents near unity (0.9–1.1), showing that metabolic rate scales isometrically with mass during larval growth. Metabolic rates were independent of the concentration of larvae used in the respirometer chambers for a range of larval concentrations from 4 to 400 larvae ml-1 (coulometric respirometer) and from 241 to 809 larvae ml-1 (polarographic oxygen sensor). Metabolic rates were measured using coulometric respirometry and two other commonly used techniques, polarographic oxygen sensors and Winkler’s titration. Polarographic oxygen sensors in small, sealed chambers (100µl) consistently gave the lowest values (by as much as 80%) for the asteroid, echinoid and molluscan larvae. By comparison, rates of oxygen consumption measured using coulometric respirometry and Winkler’s titration (to measure the change in oxygen concentration over time) were similar and consistently higher. Although the polarographic oxygen sensor is the most widely used method for measuring the metabolism of small animals in sealed 100–1000µl chambers, it appears that the metabolism of some larvae is adversely affected by the conditions within these respirometers.
Keyword Metabolism
Larval development
Coulometric respirometry
Polarographic oxygen sensors
Winkler assay
Asterina miniata
Crassostrea gigas
Dendraster excentricus
Strongylocentrotus purpuratus
Strongylocentrotus franciscanus
Acartia tonsa
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 52 times in Thomson Reuters Web of Science Article | Citations
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