Abstract
We measured the levels of lipid classes (wax esters, triacylglycerides, free fatty acids, sterols, phospholipids) and levels of glycogen in a population of Abarenicola pacifica over a one-year period beginning shortly after recruitment. Glycogen and lipid contents were unrelated to growth rates as estimated by changes in average size of individuals in the cohort. There was no indication of seasonality in levels of any component, consistent with the hypothesis of Slobodkin and Richman that animals living in environments where food supplies are likely to be stable, such as subsurface deposit-feeders like A. pacifica, do not accumulate energy reserves. Instead, glycogen content increased gradually and most lipid classes decreased gradually over time. A notable exception was the triacylglyceride content, which showed a large increase associated with the formation of eggs. Triacylglyceride levels in older A. pacifica and in two other species of depositfeeding polychaetes showed similar trends. Measurement of triacylglyceride levels may provide an additional objective method, supplementing egg counts and egg size, of quantifying reproductive effort in deposit-feeders.
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Communicated by N. H. Marcus, Tallahassee
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Taghon, G.L., Prahl, F.G., Sparrow, M. et al. Lipid class and glycogen content of the lugworm Abarenicola pacifica in relation to age, growth rate and reproductive condition. Marine Biology 120, 287–295 (1994). https://doi.org/10.1007/BF00349690
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DOI: https://doi.org/10.1007/BF00349690