• No results found

Comparison of values of organic production obtained from Oxygen and C14 methods

N/A
N/A
Protected

Academic year: 2022

Share "Comparison of values of organic production obtained from Oxygen and C14 methods"

Copied!
7
0
0

Loading.... (view fulltext now)

Full text

(1)
(2)

Reprinted f r o m "The Proceedings of the In-dian Academy of Scierzes'', Vol. LVI, No. 5, Sec. B, 1962

-

A

COMPARISON O F VALUES O F ORGANIC PRODUCTION OBTAINED F R O M OXYGEN

A N D

c14 METHODS*

BY R. RAGHU PRASAD, F.A.Sc., AND P. V. RAMACHANDRAN NAIR

(Central Marine Fisker~es Research Jnstitufe, Mandapam Camp) Received Ju!y 31. I962

STUDY of marine photosynthesis has been one of the main concerns of marine biological investigations during recent years. With the introduction of radioactive carbon (C14) by Steemann Nielsen (1952) in the measurement of organic production in the sea, this branch of investigation has received consi- derable fillip. Thc great sensitivity of this technique has revealed several complex problems regarding factors influencing plant production. However, regarding the interpretation of C1* values there has been much discussion as to whether the method measured gross or net production.

In the oxygen method, dissolved oxygen concentration is influenced by the respiration of the whole community including phytoplankton, zooplankton and bacteria. The ' dark ' bottle makes the correction for this respiration.

Hence the ' light ' and ' dark ' bottle method gives gross production. It is also possible from these experiments to measure the " net community production " but not the true net production. But Ryther (1956) remarks that gross production is an intangible quantity, whereas net production is the real production of organic niatter which is added to the environment and hence of real concern to the ecologist.

In order to have a proper reconciliation of the values obtained by the oxygen and C14 methods it is essential to have direct comparisons of values of concurrent experiments. But data on these are very scanty and even the available results are mostly for pure cultures.

The authors have been using ' light ' and ' dark ' bottle method for some time in the study of primary production of the coastal waters of Mandapam.

Recently with a consignment of C14 obtained from the International Agency

* Pablis:ied with the permission of the Diqector, Central Marine Fisheries Research Institute Mandapam Camp.

296

(3)
(4)
(5)
(6)
(7)

References

Related documents

Light and dark bottle oxygen technique is widely used to estimate the rate of gross and net photosynthetic production (G.P.P. and N.P.P.) in the marine environment, of which

Net prirnary production values sl,o\vcd 7.2 fold morc protluction at contol sitc tllan tllat or polluted site.. This high rate of production is chielly due to the

Along the west coast of India maximum production of phytoplankton occurs during the south west monsoon season from June to September after which there is a decline in the

(n)jt9)(di(a oJ(u<fl)65nc/5 oraanlcrojcaTcdiiziainjiasBnc/S ng)CTT)l63t3fflaf) RnooflnlalceQoo. gjaloBjns aojojcaounfljro) OT[?)n(a.cQ)jgg (.njosm

Although considerable data are available on the standing crop of plankton, practically no information is available on the daily production of organic matter in our waters

Live Stock Population, Production of Milk, Eggs and wool, Fish, Prawn production and Achievements under procurement of Rice, Gross State Domestic Production of Agriculture sector

Large-scale hydroponic fodder (LSHF) units can help create employment, as they can be owned and operated by self-help groups (SHGs), dairy cooperatives, civil society

Click on the video icon to go to the Drought Response and Recovery Project for Water Utilities: Case Studies Map to watch videos about utility water supply and demand actions..