. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GORGONIAN FERTILIZATION 23 316 320 O S4 A o 324 306 O 294 314* n* 313* 315 94-126 O 321 295 • 303 •94-135 1m 94-120 Figure I. Map of Pseiidiiplexaura norosa colonies (taller than 50cm) at Korhiski reef. San Bias Panama. Female colonies (tilled circles), male colonies (empty circles), and S4 current meter (triangle). Collections were made at positions downstream ol the entire population (N or S) and one position in the center of the population (C). with current from the north — 3 colonies at a distance of 10 m. mean
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GORGONIAN FERTILIZATION 23 316 320 O S4 A o 324 306 O 294 314* n* 313* 315 94-126 O 321 295 • 303 •94-135 1m 94-120 Figure I. Map of Pseiidiiplexaura norosa colonies (taller than 50cm) at Korhiski reef. San Bias Panama. Female colonies (tilled circles), male colonies (empty circles), and S4 current meter (triangle). Collections were made at positions downstream ol the entire population (N or S) and one position in the center of the population (C). with current from the north — 3 colonies at a distance of 10 m. mean = nr. center position with current from the south — 3 colonies at a distance of m, mean = m). Variability in fertilization In situ fertilization ranged between 0% and 98%. The majority (66%) of the downstream samples had levels of 25 r w 20 0) Q. ,n 15 0) a. • 1994 D1995. 0 10 20 30 40 50 60 70 80 90 100 Fertilization (%) Figure 2. Frequency distribution of fertilization rates among all samples of pornsa eggs from all nights. fertilization above 50%. The modal fertilization rate was 80%-90% in both years (Fig. 2). Fertilization rates did not differ significantly between years, but did vary sig- nificantly between months and days (Tables I and II). The lowest monthly mean was observed in September. Fertilization was high on at least one night during each month (Table II). Annual fertilization success during 1995 was estimated by weighting the fertilization rate of each night by the number of female colonies observed spawning (Table II; Fig. 3), yielding an estimated fertil- ization rate of 67%. Sperm release was not visible in the field, and measures of sperm density were highly vari- Table I Nested analysis «/ variance / lcrlili:ation rule's />/ Pseudoplexaura porosa between year*, among months, and among days (months ncsleit in years, and days nested in monllis) Source df SS MS F P Year 1 Month 6 2
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
