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Physiological energetics of the intertidal sea anemone Anthopleura
elegantissima . I. Prey capture, absorption efficiency and growth.
Zamer, WE
Marine biology. Berlin, Heidelberg [MAR. BIOL.]. Vol. 92, no. 3,
pp. 299-314. 1986.
High-intertidal (H) individuals of the sea anemone Anthopleura
elegantissima (Brandt) are exposed aerially up to 18 h each day,
unlike low-intertidal (L) individuals which may be continuously
immersed over many days. Thus, H anemones experience shorter
feeding periods compared to L anemones. From 1980 to 1982, H and L
anemones were observed and collected at the mouth of Bodega Harbor
in North Central California (USA) to determine whether any
physiological adaptations mitigate the energetic effects of
reduced feeding time in H anemones. Weight of prey in coelenterons
of H anemones was three times more than that of L anemones
following a single immersion period. Different prey-capture rates
results from increased receptivity to prey in H anemones, rather
than from increases in feeding surface. Absorption efficiency was
inversely related to ration size in anemones from both shore
positions. H individuals absorbed food more efficiently than L
individuals fed equivalent rations. Ration, not exposure
conditions, affected absorption efficiency. Daily growth rates
were 1.5 to 1.8% and 1.2 to 1.4% of dry body weight in H and L
anemones fed large rations (4.0 to 5.6% of dry body weight),
respectively.
 Descriptors: Article Subject Terms ecophysiology | food intake | growth rate | nutrient
utilization | predation | Article Taxonomic Terms Anthopleura elegantissima
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