. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 98 B. G. MINER ET AL in Emlet (1). The correct units are actually micrograms of carbon (R. B. Emlet. pers. comm.). not micrograms of organic matter as originally reported. Therefore, the actual egg energy measured by Emlet was ± SD J egg"1. Despite this error, our egg energy measurement is still approximately 2-fold greater than the previous one, with no difference in egg size (274 ± SD /urn and 280 ± SD jam). There are two possible explanations for this discrepancy: geographical and temporal diffe
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 98 B. G. MINER ET AL in Emlet (1). The correct units are actually micrograms of carbon (R. B. Emlet. pers. comm.). not micrograms of organic matter as originally reported. Therefore, the actual egg energy measured by Emlet was ± SD J egg"1. Despite this error, our egg energy measurement is still approximately 2-fold greater than the previous one, with no difference in egg size (274 ± SD /urn and 280 ± SD jam). There are two possible explanations for this discrepancy: geographical and temporal differences in egg energy content among populations, or inaccurate measurements of egg energy content. This study used adult C. rosaceus from a different pop- ulation and different years than Emlet (1); the Florida Keys (east Caribbean) in 2000 and 2001, and Panama (west Caribbean) in 1983, respectively. Although we sampled different populations, no other studies comparing intraspe- cific variation in egg energy content report differences as great as the discrepancy between Emlet's measurements and ours (8-10). Additionally, equivalent (>2-fold) interspe- cific variation in egg energy content is correlated with large increases in egg size (11-17). Furthermore, we detected only a small temporal difference in egg energy between 2000 and 2001 ( ± SD J egg"' and ± SD J egg"1). We used improved methods, directly counting a small number of eggs for each replicate (exactly 20 eggs) and measuring egg energy content for 5 females in 2000 and 3 females in 2001. Also, our value of egg energy density for C. rosaceus ( J ml"') is within the range of other planktotrophic species of echinoids, and improves McEd- ward and Morgan's (17) regression of egg size vs. egg energy (Fig. 1). We conclude that the value of J egg" ' should be used to estimate parameters for future models, and for re-examinine existing models (2. 3). Table I Mean diamet
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