Effects of planktivorous fish and nutrient additions on primary production of shallow versus deep (stratified) lake enclosures

1996 ◽  
Vol 53 (5) ◽  
pp. 1125-1132 ◽  
Author(s):  
S Perin ◽  
F R Pick ◽  
D RS Lean ◽  
A Mazumder
Keyword(s):  
Primary Production ◽  
Planktivorous Fish ◽  
Stratified Lake ◽  
Nutrient Additions

scholarly journals Fertilization of an oligotrophic lake with a deep chlorophyll maximum: predicting the effect on primary productivity

1997 ◽  
Vol 54 (5) ◽  
pp. 1177-1189 ◽  
Author(s):  
H P Gross ◽  
W A Wurtsbaugh ◽  
C Luecke ◽  
P Budy
Keyword(s):  
Primary Production ◽  
Chlorophyll A ◽  
Primary Productivity ◽  
Sockeye Salmon ◽  
Deep Chlorophyll Maximum ◽  
Light Penetration ◽  
Low Light ◽  
Nutrient Additions ◽  
Light Levels ◽  
The Mean

We investigated how epilimnetic fertilization would affect chlorophyll levels and light penetration of oligotrophic sockeye salmon (Oncorhynchus nerka) lakes and how the resulting self-shading would affect primary production of the prominent deep chlorophyll maxima (DCM) of the lakes. Epilimnetic nutrient additions to large mesocosms (330 m3) in Redfish Lake, Idaho, increased levels of primary productivity and chlorophyll a but decreased Secchi depths and light available in the metalimnion and hypolimnion. Redfish Lake and other Sawtooth Valley (Idaho) lakes had DCM in which the mean chlorophyll a peaks were 240-1000% of mean epilimnetic chlorophyll a concentrations. The DCM existed at low light levels and accounted for 36-72% of the lakes' primary production. Simulations using photosynthesis-irradiance (P-I) curves demonstrated that fertilization would increase predicted water column primary production by 75-101%. Most of this increase occurred in the epilimnion, with only a slight decrease occurring in the DCM as the result of increased shading.

scholarly journals The effects of nutrient additions on particulate and dissolved primary production in surface waters of three Mediterranean eddies

2010 ◽  
Vol 7 (6) ◽  
pp. 8919-8952 ◽  
Author(s):  
A. Lagaria ◽  
S. Psarra ◽  
D. Lefèvre ◽  
F. Van Wambeke ◽  
C. Courties ◽  
...  
Keyword(s):  
Primary Production ◽  
Surface Waters ◽  
Eastern Mediterranean ◽  
Phytoplankton Production ◽  
Metabolic Rates ◽  
Nutrient Additions ◽  
Carbon Demand ◽  
Production Values ◽  
Heterotrophic Prokaryotes ◽  
Community Production

Abstract. The effects of additions of nitrogen (+N), phosphorus (+P), alone and in combination, were assessed during three microcosm experiments performed with surface waters of three anticyclonic eddies, located in the Western, Central and Eastern Mediterranean. We examined the effects of nutrient additions on rates of dissolved and particulate primary production and on metabolic rates of the osmotrophic community (phytoplankton and heterotrophic prokaryotes). The experiments were performed in June/July 2008 during the BOUM (Biogeochemistry from the Oligotrophic to the Ultra-oligotrophic Mediterranean) cruise. In all three experiments, particulate primary production was significantly stimulated by the additions of nitrogen (+N, +NP) while no effect was observed with the addition of phosphorus alone. Percent extracellular release (PER) showed an inverse relation with total primary production (PPtotal), displaying the lowest values (4–8%) in the +NP treatment. Among the three treatments, the +NP had the strongest effect on the community metabolic rates leading to positive net community production values (NCP>0). These changes of NCP were mainly due to enhanced gross community production (GCP) rather than lower respiration rates (CR). In +NP treatments autotrophic production (whether expressed as GCP or PPtotal) was high enough to fulfil the carbon requirements of the heterotrophic prokaryotes, with phytoplankton and heterotrophic prokaryote production positively correlated. Addition of nitrogen alone (+N) had a smaller effect on community production, resulting in metabolically balanced systems (NCP≈0). Finally, heterotrophic conditions persisted in the +P treatment at the central and eastern stations, and gross production was not sufficient to supply bacterial carbon demand, evidence of a decoupling of phytoplankton production and consumption by heterotrophic prokaryotes.

scholarly journals The effects of nutrient additions on particulate and dissolved primary production and metabolic state in surface waters of three Mediterranean eddies

2011 ◽  
Vol 8 (9) ◽  
pp. 2595-2607 ◽  
Author(s):  
A. Lagaria ◽  
S. Psarra ◽  
D. Lefèvre ◽  
F. Van Wambeke ◽  
C. Courties ◽  
...  
Keyword(s):  
Primary Production ◽  
Surface Waters ◽  
Inorganic Nitrogen ◽  
Gross Primary Production ◽  
Community Respiration ◽  
Phytoplankton Production ◽  
Metabolic Rates ◽  
Nutrient Additions ◽  
Carbon Demand ◽  
Heterotrophic Prokaryotes

Abstract. We examined the effects of nutrient additions on rates of 14C-based particulate and dissolved primary production as well as O2-based metabolic rates in surface waters (8 m) of three anticyclonic eddies, located in the Western, Central and Eastern Mediterranean. Ship-board microcosm experiments employing additions of inorganic nitrogen (+N) and phosphorus (+P), alone and in combination (+NP), were conducted in June/July 2008 during the BOUM (Biogeochemistry from the Oligotrophic to the Ultra-oligotrophic Mediterranean) cruise. In all three experiments, particulate primary production was significantly stimulated by the additions of nitrogen (+N, +NP) while no effect was observed with the addition of phosphorus alone (+P). Percent extracellular release of photosynthate (PER) displayed the lowest values (4–8 %) in the +NP treatment. Among the three treatments (+N, +P, +NP), the +NP had the strongest effect on oxygen metabolic rates, leading to positive values of net community production (NCP > 0). These changes of NCP were mainly due to enhanced gross primary production (GPP) rather than reduced dark community respiration rates (DCR). In all three sites, in +NP treatment autotrophic production (whether expressed as GPP or PPtotal) was sufficient to fulfil the estimated carbon requirements of heterotrophic prokaryotes, while addition of nitrogen alone (+N) had a weaker effect on GPP, resulting in metabolically balanced systems. At the three sites, in treatments with N (+N, +NP), phytoplankton and heterotrophic prokaryote production were positively correlated. Heterotrophic conditions were observed in the Control and +P treatment at the central and eastern sites, and autotrophic production was not sufficient to supply estimated bacterial carbon demand, evidence of a decoupling of phytoplankton production and consumption by heterotrophic prokaryotes.

Temperature sensitivity of vertical distributions of zooplankton and planktivorous fish in a stratified lake

Oecologia ◽  
2006 ◽  
Vol 151 (2) ◽  
pp. 322-330 ◽  
Author(s):  
Ingeborg Palm Helland ◽  
Jörg Freyhof ◽  
Peter Kasprzak ◽  
Thomas Mehner
Keyword(s):  
Temperature Sensitivity ◽  
Planktivorous Fish ◽  
Stratified Lake ◽  
Vertical Distributions

scholarly journals Contribution of the deep chlorophyll maximum to primary production, phytoplankton assemblages and diversity in a small stratified lake

2020 ◽  
Author(s):  
Alexandrine Pannard ◽  
Dolors Planas ◽  
Philippe Le Noac’h ◽  
Myriam Bormans ◽  
Myriam Jourdain ◽  
...  
Keyword(s):  
Primary Production ◽  
Deep Layer ◽  
Light Attenuation ◽  
Environmental Drivers ◽  
Total Production ◽  
Deep Chlorophyll Maximum ◽  
Phytoplankton Assemblages ◽  
Stratified Lake ◽  
Stratified Lakes ◽  
Chlorophyll Maximum

Abstract This 6-month study characterized the contribution of deep chlorophyll maximum (DCM) to lake phytoplankton diversity and primary production, in relation to stratification during the ice-free season. Phytoplankton and zooplankton dynamics were examined with environmental drivers in a small stratified lake that presents vertical gradients of light and nutrients. The phytoplankton, first composed of diatoms and chrysophyceae, shifted to cyanobacteria in mid-July. With stratification increase, surface nutrient limitation appeared to favor motile species characteristic of oligotrophic environments above a deep layer of filamentous cyanobacteria, fueled by the vertical nutrient fluxes from sediment. The DCM contributed on average to 33% (but up to 60%) of total production during the strongest summer stratification period. In late summer, as stratification was eroding, the vertical gradient of nutrients was reduced, but light attenuation with depth increased. Distinct assemblages were identified between surface and deep layer with shade-adapted species. The contribution of DCM was reduced to 10%. Zooplankton community varied in conjunction with phytoplankton and stratification. Our study demonstrates no benefit of DCM for taxonomic and functional diversity and a limited contribution to total production. The depths over which phytoplankton use separate spatial niches may be lesser in a 6-m-deep lake compared with deeper stratified lakes.

PRESENT AND FUTURE PROSPECTS FOR FORESTRY IN THE CENTRAL PUMICE REGION

1971 ◽  
pp. 14-17
Author(s):  
J. Ure
Keyword(s):  
New Zealand ◽  
Primary Production ◽  
Future Prospects ◽  
Export Markets ◽  
Local Conditions

The region contains half the area of exotic forest in New Zealand and the major industries dependent thereon. Both are expanding rapidly to meet promising export markets. Local conditions are particularly favourable for this form of primary production and continued expansion is expected.

Primary Production of Phytoepiphyton in Water Bodies of Kiev

2008 ◽  
Vol 44 (4) ◽  
pp. 35-41 ◽  
Author(s):  
O. A. Sosnovskaya ◽  
P. D. Klochenko ◽  
G. V. Kharchenko
Keyword(s):  
Primary Production ◽  
Water Bodies
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