Bioenergetics of ephyra larvae of the scyphozoan jellyfish Aurelia aurita in relation to temperature and salinity

摘要: The body mass of Aurelia aurita ephyrae was better correlated with the diameter central disc than distance between opposite rhopaliae or lappet tips. Body dry weight (y, in μg) related to (x, mm) through equation y = 22.33 x 1.99. exponent 1.99 significantly lower that for medusa stage, indicating a tendency grow rather ephyra stage. average ash-free (AFDW) 38.0% weight. AFDW/diameter relationship used convert measured diameters AFDW and calculate succession mass, daily ration, growth rate gross efficiency. Effects temperature (6, 9.5, 12, 15 18 °C) salinity (17.5, 22, 26, 30.5 35 PSU) on these parameters feeding were studied at saturated prey concentration (222 Artemia nauplii l−1 initial concentration) by measurements over 10 d. There strong effect total ingestion, rate, efficiency final individual ephyrae, whereas ration not different temperatures. experimental group kept highest (18 °C) diverged most, this ingested 2.7 times more increased 5.4 6 °C. 34.5% 25.1%, respectively, higher 6, 9.5 15 °C. Significant effects shown weight, although only ingestion sufficiently show post-hoc test. This test showed all salinities except 22 PSU 17.5 26 PSU. from other salinities, none any significant differences. Thus, provided food excess A. can double its every 2 4 d, dependent therefore develop stage short time. Differences environmental range have little no efficiency, our results indicate full seawater (35 causes compared salinities.