. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 156 D. McHUGH tistical analyses; (5) number of days larvae spend in the plankton; (6) stage at juvenile, the number ofsetigers present on larvae when they begin to feed on the adult diet; (7) duration of the breeding season (months); and (8) breeding strategy, iteroparous or semelparous. The relationships between these traits in the family Terebel- lidae were examined using a correlation matrix. ANOVA was used to determine whether traits differed significantly among the reproductive modes, and multiple regression
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 156 D. McHUGH tistical analyses; (5) number of days larvae spend in the plankton; (6) stage at juvenile, the number ofsetigers present on larvae when they begin to feed on the adult diet; (7) duration of the breeding season (months); and (8) breeding strategy, iteroparous or semelparous. The relationships between these traits in the family Terebel- lidae were examined using a correlation matrix. ANOVA was used to determine whether traits differed significantly among the reproductive modes, and multiple regression analysis was used to examine the covariation of some traits when body size is held constant. APR 90 Results Present studv Reproductive mode. Eiipolymnia crescent is and Neoamphitrite robusta are both broadcast spawners, as shown by their free-spawning behavior in the lab during July and August, 1991, and May, 1991, respectively. Moreover, no brooded larvae were ever found in the field. Thelepus crispus and Rame.\ californiensis, on the other hand, are both brooders. Females of T. crispus were col- lected in the field with several elongated egg masses at- tached to the interior of the tube. Ramex californiensis sequentially lays small cocoons along the length of the inner tube wall. Body size. The maximum body length of the four spe- cies ranges from 25 mm in R. californiensis to 280 mm in T. crispus: E. crescentis measures up to 130 mm, and N. robusta has a maximum length of 250 mm (Hartman, 1969; pers. obs.). Using the volume of a cone ('/airrh) as an estimate of body volume, with body length = h and body width = 2r, the order of body sizes among the four species remains the same (R. californiensis: ~26 mm3; E. crescentis: ~3400 mm3; N. robusta: ~11,000 mm3; T. crispus: ~~ 12,400 mm3). Length of breeding season. Figure 1 shows the oocyte size frequency histogram for E. crescentis from April 1990 to March 1991. Oocytes grow rapidly from about 50 ^trn in April to begin to accum
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
