ANGER and DAWIRS: ELEMENTAL COMPOSITION OF HYAS ARANEUS 



determine food consumption in the Z-l stage 

 using Artemia salina nauplii as prey. The 

 average values found were near 20 /ug C/d per 

 ind. or 0.8 to 0.9 J/d. Gross growth efficiency 

 therefore should be about 10 to 20%. The amount 

 taken up by the larvae (3 d old) corresponded to 

 ca. 55% of their own body C and to ca. 36% of their 

 own DW. In light of the experimental conditions, 

 we consider this near the maximum level. 



Loss of Biomass During Starvation 



F W of starving larvae did not show significant 

 changes (Tables 6 to 8). Also water content could 

 not always be measured with sufficient accuracy 

 to detect clear trends. In the Z-l and in the 

 megalopa, first a slight decrease and later a con- 

 spicuous increase of water content occurred. The 

 latter trend was linear in the Z-l (Fig. 2); it could 



Table S.—Hyas araneus losses in starved Z-l larvae. For explanation of abbreviations see Table 1. 



Table l.—Hyas araneus losses in starved Z-2 larvae. For explanation of ab- 



brevations see Table 1. 



'Analyses of group maintained larvae 



427 



