Nutrient control of phytoplankton production in Lake Naivasha, Kenya

被引：10
作者：
Hubble, DS
Harper, DM
机构：
[1] Ecol Monitoring & Res, Eastleigh SO50 4NX, Hants, England
[2] Univ Leicester, Dept Biol, Leicester LE1 7RH, Leics, England
来源：
HYDROBIOLOGIA | 2002年 / 488卷 / 1-3期
关键词：
nutrients; tropical; shallow; lake; eutrophication;
D O I：
10.1023/A:1023318212258
中图分类号：
Q17 [水生生物学];
学科分类号：
071004 ;
摘要：
Lake Naivasha, a shallow tropical lake in Kenya's Rift Valley, has an unstable water column and is moderately eutrophic. Nutrient ( bottom- up) control of primary production is more important than grazing ( top- down) control. Experimental nutrient enrichment was used to investigate bottom- up control in more detail. Minor nutrients were not found to be limiting, whilst nitrogen was more limiting than phosphorus with an algal preference for ammonium over nitrate. Sediments form a phosphorus sink but there is hypolimnetic release from the one area showing regular temporary stratification. This indicates that the rate of primary production in the water column could double if conditions change to allow lake- wide nutrient release from sediments. Both external and recycled nutrient regeneration are important.
引用
收藏
页码：99 / 105
页数：7
相关论文
共 14 条
[1]   QUANTIFYING EXTERNAL AND INTERNAL NITROGEN AND PHOSPHORUS POOLS, AS WELL AS NITROGEN AND PHOSPHORUS SUPPLIED THROUGH REMINERALIZATION, IN COASTAL MARINE PLANKTON BY MEANS OF A DILUTION TECHNIQUE [J].
ANDERSEN, T ;
SCHARTAU, AKL ;
PAASCHE, E .
MARINE ECOLOGY PROGRESS SERIES, 1991, 69 (1-2) :67-80
[2]  
Beauregard A. C. G. de, 1998, Bulletin des Seances, Academie Royale des Sciences d'Outre-Mer, V44, P373
[3]   MICROCONSUMER GRAZING AND SOURCES OF LIMITING NUTRIENTS FOR PHYTOPLANKTON GROWTH - APPLICATION AND COMPLICATIONS OF A NUTRIENT-DELETION/DILUTION-GRADIENT TECHNIQUE [J].
ELSER, JJ ;
FREES, DL .
LIMNOLOGY AND OCEANOGRAPHY, 1995, 40 (01) :1-16
[4]  
Harper D.M., 1995, WETL ECOL MANAG, V3, P111
[5]   ECOLOGY AND MANAGEMENT OF LAKE NAIVASHA, KENYA, IN RELATION TO CLIMATIC-CHANGE, ALIEN SPECIES INTRODUCTIONS, AND AGRICULTURAL-DEVELOPMENT [J].
HARPER, DM ;
MAVUTI, KM ;
MUCHIRI, SM .
ENVIRONMENTAL CONSERVATION, 1990, 17 (04) :328-336
[6]   PHOSPHORUS LIMITATION IN SOME TROPICAL AFRICAN LAKES [J].
KALFF, J .
HYDROBIOLOGIA, 1983, 100 :101-112
[7]   ENDLESS SUMMER - INTERNAL LOADING PROCESSES DOMINATE NUTRIENT CYCLING IN TROPICAL LAKES [J].
KILHAM, P ;
KILHAM, SS .
FRESHWATER BIOLOGY, 1990, 23 (02) :379-389
[8]   Phosphorus inputs to Lake Naivasha, Kenya, from its catchment and the trophic state of the lake [J].
Kitaka, N ;
Harper, DM ;
Mavuti, KM .
HYDROBIOLOGIA, 2002, 488 (1-3) :73-80
[9]   A REFINED DILUTION TECHNIQUE FOR MEASURING THE COMMUNITY GRAZING IMPACT OF MICROZOOPLANKTON, WITH EXPERIMENTAL TESTS IN THE CENTRAL EQUATORIAL PACIFIC [J].
LANDRY, MR ;
KIRSHTEIN, J ;
CONSTANTINOU, J .
MARINE ECOLOGY PROGRESS SERIES, 1995, 120 (1-3) :53-63
[10]   FORMS AND DISTRIBUTION OF INORGANIC PHOSPHORUS IN SEDIMENTS OF 2 SHALLOW EUTROPHIC LAKES IN FLORIDA [J].
OLILA, OG ;
REDDY, KR ;
HARRIS, WG .
HYDROBIOLOGIA, 1995, 302 (02) :147-161
12