. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. U 5 10 15 20 25 30 Age (d) B. //. erythrogramma. 8 10 Age (d) Figure 1. Changes in dry organic mass as a function of time for the embryos and larvae of the plankto- trophic echinoid. Hc/inciilur^ luhcmilala (A), and the lecithotrophic echinoid, // erylhmgramma (B). Shown are means ± 1 SEM (n = 5-6 replicate weight determinations at a given age), with different symbol types representing cultures derived from separate parental pairs. Drawings indicate the morphology of larvae at various stages during development (adapted from
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. U 5 10 15 20 25 30 Age (d) B. //. erythrogramma. 8 10 Age (d) Figure 1. Changes in dry organic mass as a function of time for the embryos and larvae of the plankto- trophic echinoid. Hc/inciilur^ luhcmilala (A), and the lecithotrophic echinoid, // erylhmgramma (B). Shown are means ± 1 SEM (n = 5-6 replicate weight determinations at a given age), with different symbol types representing cultures derived from separate parental pairs. Drawings indicate the morphology of larvae at various stages during development (adapted from Emlet, 1995). C. competent larval stages; J. juveniles. The arrow indicates the approximate age at which H. erythrogramma reaches metamorphic competence. pmol O: larva ' h ') to metabolic rates that ranged between 200 and 500 pmol O: larva"1 h"1 (Fig. 2A). Metabolic rates generally followed changes in biomass. However, specific metabolic rates (SMR) indicated that this was not strictly so. Three distinct phases could be identified (Fig. 3A): (1) An initial increase in specific metabolic rate over the first 2 days; (2) a relatively stable phase from days 2 to 10 in which the SMR ranged be- tween 150 and 250 pmol O2 jtg~' h '; and (3) a final phase (days 10-22) in which the SMR dropped to be- tween 50 and 150 pmol O: /ug~' h~'. Heliocidaris erythrogramma. The metabolic rate of//. erythrogramma showed some dramatic changes during development. Metabolic rates increased steadily from 17 to 27 pmol O: larva"' h"1 just after fertilization to ap- proximately 600-800 pmol O2 larva"' h"' at 36 h (22°C, Fig. 2B). A transient spike in the metabolic rate was seen in some cultures between 25 and 31 h after fertilization (corresponding to late gastrulation, early vestibule for- mation). This spike was not seen in all cultures, however. Metabolic rates ranged from 600 to 1000 pmol O2 larva"1 h"1 from days after fertilization until meta- morpho
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
