Gao, Y.H. & B. Lin. (1999). [Effects of some factors on feeding rates of Acartia pacifica.]. Journal of the Xiamen University of Natural Sciences. 38(5)152:751-757. (In Chinese.).

87924

Gao, Y.H. & B. Lin

1999

38(5)152:751-757. (In Chinese.)

Publication

Effects of temperature、salinity、food concentration、food items,and starvation on feeding rates of Acartia pacifica Steuer,a dominant planktonic copepod in Xiamen Harbour,were studied during the period from March to June,1993. It was found that filtering rates ( F ,mL/ind·h) and grazing rates ( G ,cells/ind·h) on Phaeodactylum tricornutum were greatly affected by culture temperature, which increased with temperature (10~25 ℃) and decreased when temperature was up to 30 ℃. The optimal temperature for feeding was around 25 ℃, at which F and G were 0.058 and 9.33×10 4 respectively. F and G were also greatly affected by salinity, which increased with salinity from 12 to 26 and began to decrease when salinity reached to 30~32. The optimal salinity for feeding is around 26,at which F and G were 0.030 and 4.37×10 4 respectively. F tended to decrease and G to increase when food concentration increased from 6.22×10 5 to 1.00×10 7 cells/mL. F on 9 species of common algae was as follow: Spirulina platensis (5.570)  Skeletonema sp.(0.020) Platymonas subcordiformis (0.017) Heterogloea sp .(0.016) Isochrysis galbana (0.014) Phaeodactylum tricornutum (0.010) Chlorella sp .(0.006) Biddulphia sinensis (0.001), Corethron hystrix (0.001). F and G of pre starved Acartia pacifica were higher than those of the pre fed. F and G were highest (0.034 and 11.56×10 4) for those pre starved for 48h,but F and G began to decrease when starvation was longer than 48h because of unusual physiological effect of starvation and crowd. Acartia pacifica predated on animal food (newly hatched Artemia nauplii) when algal food was not available. The ingestion rate ( I ,nauplii/ind·h) was up to 0.223 if food availability was sufficient. The maxium grazing rate on algal food (0.746 μgC/ind·h) was about 5.5 times that of the maxium ingestion rate on animal food (0.137 μgC/ind·h),which implied that Acartia pacifica be a more herbivorousely omnivorous copepod.

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