Energetics of spider crab Hyas araneus megalopa in relation to temperature and the moult cycle

  • Anger K
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Abstract

Megalopa of spider crab Hyas araneus were reared to metamorphosis at 6 and 18 "C, and larval dry weight, carbon, nitrogen, and hydrogen content as well as oxygen consumption were measured at regular intervals during the moult cycle. When larval age is expressed as a percentage of total instar duration, it becomes obvious that the general pattern of growth (bell-shaped curves) is not influenced by temperature: all measures of biomass increase during the postmoult and intermoult stages of the moult cycle, reach maximum values in early premoult, and decrease again during later premoult. Also maximum and final biomass values are similar at the 2 temperatures. Conversion of elemental composition to biochemical data suggests that both protein and Lipid are uhhzed as metabolic substrates during the premetamorphic phase of 'negahve growth', but relatively more lipid is catabolized at 18 than at 6 'C. Rates of oxygen consumption are strongly influenced by both tempera- ture and the stage of the moult cycle. At 6 and 12 "C indwidual respiration rates (R) decrease during postmoult (the 12 "C values were taken from another study for comparison), then increase, and eventually decrease again in late premoult. At 18 "C there IS an almost steady decrease in R during the entire moult cycle. Both assimilation (A) and growth (G) rate (in units C d-l) decrease steadily during megalopa development, regardless of temperature. In Stage D, of the moult cycle A equals the metabolic demand and thus, G becomes zero. Dunng later premoult stages, G is negative, and A becomes zero prior to metamorphosis. Net growth efficiency (K,) decreases from ca 45 to 65 % in early postmoult to zero in Stage Do,.

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APA

Anger, K. (1987). Energetics of spider crab Hyas araneus megalopa in relation to temperature and the moult cycle. Marine Ecology Progress Series, 36, 115–122. https://doi.org/10.3354/meps036115

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