Abstract
Individual copepodids from nature of the lipidstoring, monocyclic, diapausing Calanus glacialis, and from nature and laboratory culture of the non-storing, polycyclic Eurytemora herdmani (both collected new Halifax, Nova Scotia in 1987 and 1988) were reared in excess food at ca. 3 and 10 °C. Soon after molts, prosome lengths and weights [total dry wt (TW) of E. herdmani; structural wt (SW) and estimated oil-sac wt (OSW) of C. glacialis] were measured. Stage durations were close to published temperature-dependent predictions; C. glacialis (almost all females) did not enter resting stages. Growth of body length was linear and of body weight (TW or SW) was exponential, with no sexual difference in E. herdmani. There were mixed effects of sizes on stage durations of individuals: weakly positive at 3 °C (but not significant at ca. 10°C) for length and SW of C. glacialis and generally weakly negative for E. herdmani, except for TW at 10 °C. Body condition (residuals of log SW vs log length) of C. glacialis at ca. 10°C, unlike length or SW, was negatively related to stage duration. There was no relationship between length-corrected SW and OSW in C. glacialis. The various results appear to suggest that health was more important than allometric constraints on growth rates of individuals. However, copepods reared at temperatures very different from those previously experienced may show long-term adjustments of size, whereas development rates respond immediately. If so, only the weakly positive effects on stage durations of length of C. glacialis at ca. 3 °C and of TW of E. herdmani at ca. 10 °C may illustrate expectations under stable temperatures and adequate food in nature.
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Communicated by R. Thompson, St. John's
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Eseribano, R., McLaren, I.A. Testing hypotheses of exponential growth and size-dependent molting rate in two copepod species. Marine Biology 114, 31–39 (1992). https://doi.org/10.1007/BF00350853
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DOI: https://doi.org/10.1007/BF00350853