Use of a subsurface plankton layer to benefit a cage-culture fishery in Lake Phewa, Nepal

Davis, Melinda F.; Gurung, Tek Bahadur; Shrestha, B. P.; Jones, Susan B.; Wylie, Glenn D.; Perkins, Bruce D.; Jones, John R.

doi:10.1080/03680770.1995.11901140

Cited by 7 publications

(16 citation statements)

References 3 publications

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“…The metalimnetic Chl peak has been described previously in this lake (Lohman et al. 1988; Davis et al. 1998).…”

Section: Resultssupporting

confidence: 55%

“…During premonsoon and monsoon periods, DOC was likely supplied in runoff from the large watershed that is dominated by forests, agriculture and an extensive urban area. During monsoon storms, factors such as interflows, water column cooling and seiche activity would also be a potential mechanism to distribute DOC in the water column from internal sources (Davis et al. 1998).…”

Section: Discussionmentioning

confidence: 99%

“…1988). During the monsoon, phytoplankton in Lake Phewa can be reduced by silt‐laden inflows that dilute lake water and reduce available light (Davis et al. 1998; Gurung et al.…”

Section: Discussionmentioning

confidence: 99%

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Abundance and nutrient limiting growth rate of heterotrophic bacterio‐plankton in Himalayan foot hill Lake Phewa, Nepal

Gurung

Dhakal²,

Husen³

et al. 2010

Lakes & Reservoirs

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We examined heterotrophic bacterial abundance, chlorophyll-a concentration and resources limiting bacterial growth from October 2004 to August 2005 in Lake Phewa. The lake has a large watershed that covers %435 ha of water surface surrounded by %23-time large catchment area that might receive up to 4850 mm annual precipitation. During the study, bacterial abundance ranged from 3.2 to 9.9 · 10 6 cells mL )1 , and chlorophyll-a varied from 2 to 32 lg L )1 . Bacterial abundance and chlorophyll-a weakly correlated (r = 0.40, n = 77, P < 0.1) in the lake. Experiments on resources, glucose (C), nitrogen (N), phosphorus (P) alone and in combination (CNP) limiting bacterial growth rate, were examined using dilution bioassays. Experimental bottles enriched with resources and controls without enrichment (in triplicate) were incubated in situ for 48 h at collection depth. Results showed that C, N and P in combination significantly (at 5% level) stimulated bacterial growth rate. Bioassays with single resource additions showed P as main nutrient limiting bacterial growth comparing with C and N, implying that rainfall received in the catchment might convey adequate resources causing increased P deficiency for bacterial growth in Himalayan foot hill Lake Phewa.

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“…The metalimnetic Chl peak has been described previously in this lake (Lohman et al. 1988; Davis et al. 1998).…”

Section: Resultssupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

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Abundance and nutrient limiting growth rate of heterotrophic bacterio‐plankton in Himalayan foot hill Lake Phewa, Nepal

Gurung

Dhakal²,

Husen³

et al. 2010

Lakes & Reservoirs

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“…1986; Reynolds et al . 2001), previous studies focused on phytoplankton dynamics in surface water layers in Lake Phewa (McEachern 1996; Davis et al . 1998; Rai 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies suggest that, although Lake Phewa is experiencing rapid eutrophication (Oli 1997), its biogeochemical parameters oscillate from oligo-to eutrophic characteristics (Rai 2000). As phytoplankton distribute mainly in water surface layers, especially when lakes are stratified (Sommer et al 1986;Reynolds et al 2001), previous studies focused on phytoplankton dynamics in surface water layers in Lake Phewa (McEachern 1996;Davis et al 1998;Rai 2000). This present study examines the seasonal variations of primary production and the phytoplankton community throughout the water column with some physical and chemical parameters, to assess the current biological conditions of Lake Phewa.…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton primary production, chlorophyll‐a and nutrient concentrations in the water column of mountainous Lake Phewa, Nepal

Gurung¹,

Dhakal²,

Bista³

2006

Lakes & Reservoirs

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The seasonal patterns of phytoplankton primary production, chlorophyll-a concentration, cell number and several other limnological variables in Lake Phewa, located in the active monsoon zone in Central Himalaya, Nepal, were studied for a year beginning in April 2001. During the study period, the gross primary production and chlorophyll-a concentrations were relatively low during the monsoon season. The phytoplankton cell number, represented by 24 genera, also fluctuated seasonally, but tended to increase in the pre-and post-monsoon period. These results suggest that the monsoon plays a crucial role in the primary production and phytoplankton dynamics for Lake Phewa. Among the phytoplankton species, Microcystis aeruginosa, a representative species for eutrophic lakes, was the dominant phytoplankton. At the same time, however, it is clear that the lake is not yet heavily eutrophic. The present study suggests that the exchange of lake water during the monsoon season contributes to maintaining the health of the lake against further degradation. Nevertheless, the silt carried in the monsoon rain run-off from the lake's catchment area suggests increasingly serious degradation problems for this small mountainous lake.

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Seasonal variation in cyanobacterial toxin production in two Nepalese lakes

Jones¹,

Jones²

2002

SIL Proceedings, 1922-2010

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Use of a subsurface plankton layer to benefit a cage-culture fishery in Lake Phewa, Nepal

Cited by 7 publications

References 3 publications

Abundance and nutrient limiting growth rate of heterotrophic bacterio‐plankton in Himalayan foot hill Lake Phewa, Nepal

Abundance and nutrient limiting growth rate of heterotrophic bacterio‐plankton in Himalayan foot hill Lake Phewa, Nepal

Phytoplankton primary production, chlorophyll‐a and nutrient concentrations in the water column of mountainous Lake Phewa, Nepal

Seasonal variation in cyanobacterial toxin production in two Nepalese lakes

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