Beitrag
Macrophyte decomposition in two tropical lakes
Ayyappan, S.; Oláh, J.; Raghavan, S. L.; Sinha, V. R. P.; Purushothaman, C. S.
Archiv für Hydrobiologie Volume 106 Number 2 (1986), p. 219 - 231
27 Literaturangaben
veröffentlicht: Mar 24, 1986
DOI: 10.1127/archiv-hydrobiol/106/1986/219
ArtNo. ESP141010602004, Preis: 29.00 €
Abstract
Seasonal and vertical variations in the decomposition rates of water hyacinth and its ingredient-simulating model substrates of filter paper cellulose and silk protein were monitored in two representative freshwater bodies of India. An in situ procedure to measure the weight losses was developed that provides a simple means of obtaining quick estimates. Of the three substrates, water hyacinth showed maximum decomposition rates ranging from 4 to 11 daily percent of weight loss in the pond and from 1.1 — 6.3 in the lake. These values for cellulose ranged from 0 to 3.6 in the pond and from 0.1 to 3.5 in the lake. Weight loss of protein was smaller ranging from 0 to 3 in the pond and from 0 to 1.2 in the lake. Seasonal maxima developed during temperature maxima for hyacinth and during minima for model substrates with some deviations. Weight losses were higher in bottom water and at the sediment-water interface. Decomposition was compared and discussed with the measured physico-chemical environment and bacterial communities in the two water bodies as well as with weight loss magnitude known for other water bodies. Decomposition under these tropical conditions was much higher than in the temperate zone. This rapid decomposition has an important function in mineral recycling in nutrient deficient tropical waters.
Schlagworte
tropical lakes • water hyacinth • cellulose • silk protein • India