. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. WATER VAPOR ABSORPTION IN ISOPODS 249 aging to the minimum ambient activities required for diurnal replenishment of the resultant water losses. Such water budget curves are illustrated in Figure 4 for the species studied, assuming a uniform diel temperature of 20°C. The nocturnal water debt could not exceed lethal dehydration levels. Data gathered for a range of Crinoch- eta (5 species, cumulative n = 14) indicate a lethal de- hydration level of hydrated mass ± SE. The low variance and absence of outliers suggests
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. WATER VAPOR ABSORPTION IN ISOPODS 249 aging to the minimum ambient activities required for diurnal replenishment of the resultant water losses. Such water budget curves are illustrated in Figure 4 for the species studied, assuming a uniform diel temperature of 20°C. The nocturnal water debt could not exceed lethal dehydration levels. Data gathered for a range of Crinoch- eta (5 species, cumulative n = 14) indicate a lethal de- hydration level of hydrated mass ± SE. The low variance and absence of outliers suggests this as a useful approximate value for the section (ca. 50% water- loss). Mean nocturnal activities in which the study species would sustain desiccation in 12 h are listed in Table IV. For most species, these are below the minimum mean foraging aw exploitable, given access to saturated air for diurnal WVA; that is to say, the maximum water recov- ered by WVA could not exceed hydrated mass in 12 h. The magnitude of water deficits incurred during nocturnal foraging is thus limited by the capacity for re- plenishment by WVA, rather than short-term (nocturnal) desiccation tolerance. The major exceptions are P. spin- icornis and T. rathkei in which the desiccation-limited foraging aw exceeds the WVA-limited aw. The most striking revelation of this analysis is the low foraging activities which many species could exploit given even modest activities (, ) for diurnal WVA. With. Diurnal Aa,, (for WVA) Figure 4. Plots of minimum mean ambient activities in which Cri- nocheta could forage nocturnally given different ambient activities for diurnal WVA. The analysis assumes a 12-h light-dark cycle. Species ini- tials are indicated beside their respective water budget curves. For each diurnal Aaw. the maximum attainable water-gain is calculated, knowing thresholds, uptake fluxes, and simultaneous loss fluxes for each species. The n
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
