Impact of stress on excretion in earthworm (Perionyxexcavatus)
In the present study, the nature of excretory products and the impact of stress on the rate of excretion of the megascolecid earthworm, Perionyx excavatus was studied. Excretion in P. excavatus was analyzed with reference to three aqueous media: tap water, distilled water and 1% Sodium chlorid...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Universiti Malaysia Terengganu
2014
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/37425/ http://irep.iium.edu.my/37425/ http://irep.iium.edu.my/37425/1/51.pdf http://irep.iium.edu.my/37425/4/37425_Impact%20of%20stress%20on%20excretion%20in%20earthworm.SCOPUSpdf.pdf |
| Summary: | In the present study, the nature of excretory products and the impact of stress on the
rate of excretion of the megascolecid earthworm, Perionyx excavatus was studied. Excretion in
P. excavatus was analyzed with reference to three aqueous media: tap water, distilled water and
1% Sodium chloride. Clitellate worms (N=5.) were taken for the study and nitrogenous products
(ammonia and urea) eliminated in the three media were analyzed for twenty four hours, sampling
was carried out at an interval of two hours. In order to assess immediate response in the first one
hour, samples were also taken at the end of 30 minutes, 45 minutes and 60 minutes, during the first
one hour of observation. After 60 minutes, the worms excreted 0.023 mg ammonia and 1.451 mg
urea in the tap water; 0.014 mg ammonia and 1.397 urea in distilled water; and 0.030 and 1.076 mg
ammonia and urea in 1% NaCl. After 60 minutes, under heat stress, the worms excreted 0.011 mg
ammonia and 0.578 Urea in the tap water; 0.006 mg ammonia and 0.682 mg urea in the distilled
water; 0.009 mg ammonia and 0.520 urea in the 1% NaCl solution. Animals exposed to H2
SO4
stress, excreted 0.034 mg ammonia and 1.023 mg urea in the tap water; 0.040 mg ammonia and
0.645 mg ammonia and 0.620 mg urea in the 1 % NaCl solution. The worm survived 24 hours in the
tap water excreting ammonia urea in the distilled water; 0.03 mg (0.188 mg) and urea (0.926 mg)
and the latter at higher amount indicating that P. excavatus is primarily ureotelic and also capable
of excreting ammonia. The worm did not survive beyond eight hours in the distilled water and 1%
NaCl. The present study clearly demonstrates that the earthworm P. excavatus is primarily ureotelic
and revert to ammonotelism under stress situation. |
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