. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 286 JAN A. PECHEN1K 100 r tr o. — ? 1 i i i D 9 15 30 45 60 75 90 MINUTES DESICCATED FIGURE 1. Desiccation tolerances of encapsulated embryos of N. obsoletus. Experiments were conducted over CaSOi desiccant. Circles represent data from capsules containing late- stage embryos (N = 455 capsules). Squares represent data from capsules containing early- stage embryos (N = 293 capsules). Open symbols indicate data from control capsules beld at 100% relative humidity for the full 90 minutes. by analysis of variance (FA-. tnnttatus
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 286 JAN A. PECHEN1K 100 r tr o. — ? 1 i i i D 9 15 30 45 60 75 90 MINUTES DESICCATED FIGURE 1. Desiccation tolerances of encapsulated embryos of N. obsoletus. Experiments were conducted over CaSOi desiccant. Circles represent data from capsules containing late- stage embryos (N = 455 capsules). Squares represent data from capsules containing early- stage embryos (N = 293 capsules). Open symbols indicate data from control capsules beld at 100% relative humidity for the full 90 minutes. by analysis of variance (FA-. tnnttatus -'- ; FjV 0^.S.(,;,^/(S — ; P > ; N :- 20 capsules for each species). Since the water-retaining ability of the capsule itself does not change with age. age-related improvements in desiccation tolerance are attributable to a change in embryonic tolerance, possibly due to the development of the embryonic shell. Egg capsules of both species lost weight at a constant rate for at least the first 8 minutes of observation. One-way analysis of variance revealed no statistically significant differences in the adjusted rates of water loss from egg capsules of the two different species (F = =; N — 20 capsules for each species; P>). Thus, the water-retaining ability of the intertidally-placed N. obsoletus capsule is essentially identical to that of the subtidally-placed N. trlvittatus capsule. Rates of water loss (weight/unit time) from capsules similar in initial weight were essentially identical, regardless of capsule age or identity. Larger capsules lost weight more rapidly than smaller capsules, as expected. The relationship between the rate of weight loss (Y) and the weight of the capsule at minutes after the start of the experiment (X) is given by the equation Y = + , as calculated by linear regression analysis (Fig. 2). The mean rate of weight loss from the 40 egg capsules was mg/30 sec ± (mean ± ). The dif- ferences i
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
