NDLI: Effect of unionized ammonia, viscosity and protozoan contamination on reproduction and enzyme activity of the rotifer Brachionus rotundiformis

Content Provider	Springer Nature Link
Author	de Araujo, Adriana Belem Hagiwara, Atsushi Snell, Terry W.
Copyright Year	2001
Abstract	We determined the effect of environmental stressors on the physiological condition of Brachionus rotundiformis. For two morphologically distinct B. rotundiformis strains: Hawaii (average lorica length = 222 μm) and Langkawi strains (average lorica length 180 μm), neonates hatched from resting eggs were exposed to different levels of unionized ammonia (0.7–9.8 mg l−1), viscosity (relative viscosity against natural seawater = 1–1.17) and Euplotes sp. (protozoan) contamination (1–40 cells ml−1). Increasing stress decreased fecundity and lifespan of both rotifer strains. Glucosidase and phospholipase activities were correlated with reproductive responses of both the strains exposed to unionized ammonia. When culture water viscosity was changed, the activity of esterase and phospholipase was correlated with reproductive responses of the Hawaiian strain, and glucosidase activity was correlated with those of Langkawi strain.With the protozoan contamination, esterase and glucosidase activities were correlated only with reproductive responses of the Hawaiian strain, while activity of all three enzymes was correlated to those of the Langkawi strain. Glucosidase activity proved to be a reliable indicator of stress for cultured B. rotundiformis.
Starting Page	363
Ending Page	368
Page Count	6
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	446
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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