✦ LIBER ✦

Primary production of phytoplankton in Lake Valencia (Venezuela)

✍ Scribed by Aida G. Infante

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 555 KB
Volume: 82
Category: Article
ISSN: 1434-2944
DOI: 10.1002/iroh.19970820404

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Lake Valencia is heavily polluted by waste water of domestic, agricultural and industrial origin. The high organic load may have produced important changes in the limnological properties. Cyanobacteria dominated in numbers and biomass (over 90% throughout the year). Chlorophyll‐a content averaged 37.7 + 15 μg · 1^−1^. Maximum concentrations of 50–80 μg · 1^−1^ were found near the inflows affected by organically polluted affluents. There has been a 50% reduction in the euphotic zone in only 13 years. The maximum rate of gross photosynthesis per hour at light saturation was determined within the uppermost 1‐meter layer. The highest value was 16,290 mg O~2~ · m^−3^ · h^−1^. Lake Valencia is among the most productive lakes in the world, with areal net photosynthesis averaging 7.5 g C · m^−2^ · d^−1^.

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