. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OOOO EMBRYO VOLUME (M 1) S. benedicti (P). OOOO4 EMBRYO VOLUME ( n 1) Figure 2. Scatter plots describing the relationship between ng C/embryo and embryo volume for each reproductive morph of Strehlospio. (11% for C and 13% for N) and 5. benedicti (P) (21 % for Cand 51% for N). A more meaningful estimate of the strength of the three significant regressions can be made by examining confi- dence limits for predicted embryo C and N content. Pre- dictions of embryo C and N co
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OOOO EMBRYO VOLUME (M 1) S. benedicti (P). OOOO4 EMBRYO VOLUME ( n 1) Figure 2. Scatter plots describing the relationship between ng C/embryo and embryo volume for each reproductive morph of Strehlospio. (11% for C and 13% for N) and 5. benedicti (P) (21 % for Cand 51% for N). A more meaningful estimate of the strength of the three significant regressions can be made by examining confi- dence limits for predicted embryo C and N content. Pre- dictions of embryo C and N content using each morph's regression parameters and a single value of embryo size (each morph's mean) produced the following predicted values (±95% confidence limits): S. shrubsolii (D), C = ±,N = /ug± ; S. benedicti (L). C = ± , N = ± ; S. benedicti (P), C = ± , N = ± These confidence intervals envelop a large portion of the range of actual values for embryo C and N content found in each of these morphs, between 53%- and 99%. The large amount of variation about these regressions, which results in such large confidence intervals, makes it difficult, if not im- possible, to make significantly different predictions of embryo C or N content from embryo volume within each morph. Discussion Offspring invest men! The negative relationship between offspring size and number described for many marine invertebrate taxa (Thorson, 1946, 1950; Emlet et 1987) including poly- chaetes (Hermans, 1979; Levin et al., 1991), was also found in this study (Table I). This tradeoff can be ex- plained by assuming there to be a finite and limited amount of energy available for reproduction (Vance, 1973a; Smith and Fretwell, 1974; Stearns. 1976), an as- sumption more easily justified among closely related spe- cies which accumulate and apportion nutrients in a similar fashion. Levin et al. (1991) observed a negative genetic co
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
