. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 90 G. S. EHLINGER AND R. A. TANKERSLEY Table 1 Matrix of painrise comparison probabilities (Tiikey test) for days to hatching for Limulus polyphemus embryos T/S T/S 25/30 25/40 25/50 25/60 30/30 30/40 30/50 30/60 33/30 33/40 33/50 33/60 n — 27 29 30 26 26 27 25 28 27 29 27 25 25/30 25/40 < 25/50 < < 25/60 < < < 30/30 < < < < 30/40 < < < < 30/50 < < < < < <0
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 90 G. S. EHLINGER AND R. A. TANKERSLEY Table 1 Matrix of painrise comparison probabilities (Tiikey test) for days to hatching for Limulus polyphemus embryos T/S T/S 25/30 25/40 25/50 25/60 30/30 30/40 30/50 30/60 33/30 33/40 33/50 33/60 n — 27 29 30 26 26 27 25 28 27 29 27 25 25/30 25/40 < 25/50 < < 25/60 < < < 30/30 < < < < 30/40 < < < < 30/50 < < < < < < 30/60 < < < < < 33/30 < < < < < < 33/40 < < < < < < 33/50 < < < < < < < < < < 33/60 < <! < < < < < < < < T = temperature (°C); S = salinity (ppt); n = sample size. Bold type indicates pairwise comparisons that are not statistically significant. rates (Table 1). but hatching was delayed significantly in more hypersaline conditions (50 and 60 ppt. Fig. 1). Opti- mal temperature and salinity conditions for development to stage 21 were 30-33 °C and 30-40 ppt. The duration of the trilobite larva stage (time from hatch- ing to molting to the first juvenile instar) decreased signifi- cantly with increasing temperature (F = , df = 6, 202, P < , Fig. 2), yet was similar for all salinity treat- ments (F = , df = 6, 202, P = ). Larval stage duration was shortest at 30-33 °C and was significantly longer at 25 °C (Tukey test. Fig. 2, Table 2). Development times were similar for larvae maintained at 30 °C and 33 °C (Fig. 2, Table 2). 80 60 - o 2 1 P 40 • 20 •. 30 40 50 60 Salinity (ppt) Figure 2. Mean (±SE) time to molting to the fir
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