lakes relative productivity

Biological production represents the total amount of living material (biomass) that was produced during a defined period of time. 7.12. Mean summertime plankton respiration (R) and photosynthesis (P) in surface waters of lakes as a function of chlorophyll concentration, an index of overall lake productivity (del Georgio & Peters, 1994). The thermal structure of lakes helps determine productivity and nutrient cycling. Jeppe Kolding, Paul A.M. van Zwieten, Relative lake level fluctuations and their influence on productivity and resilience in tropical lakes and reservoirs, Fisheries Research, 10.1016/j.fishres.2011.11.008, 115-116, (99-109), (2012). Lake Kyoga (389 kg ha-1, Lake George 156 kg ha-1 and Lake Mweru Wantipa 100 kg ha-1). Lake surface area relative to upstream catchment size and lake perimeter‐to‐surface‐area ratio were also important, with smaller upstream catchments yielding higher production, and high shoreline complexity correlated with lower productivity as measured by limnetic PR. Do lakes have lower or higher primary and secondary productivity per unit area compared with land? The index also has a strong log-linear relationship with the fish productivity. It should be noted that in the more ecologically mature Lakes Malawi and Victoria, fish productivity is less than 50 kg ha-1. ... (the relative depth of t he lake has a . Lake productivity also influences δ 13 C patterns, as France et al. Fig. 163 ecological monographs, 71(2), 2001, pp. Because lake productivity was measured solely by water column chlorophyll a in this study, this weak causality is expected. 3.2 Lakes … Lake thermal structure is determined by several factors. About 280 000 cu.km of water exists on earth in the form of lakes. Lakes receive the vast majority of their heat at the surface from solar heating. PDF | Lakes occupy about 1.8 % of the earth’s surface. 163–186 q 2001 by the ecological society of america trophic cascades, nutrients, and lake productivity: whole-lake experiments stephen r. carpenter,1,6 jonathan j. cole,2 james r. hodgson,3 james f. k itchell,1 michael l. pace,2 darren bade,1 kathryn l. cottingham,4 timothy e. essington,1 jeffrey n. houser,1 and daniel e. schindler5 A broader definition of lake productivity, that is, incorporating factors operating outside of water column (e.g., riparian meadows and mudflats), would result in a closer relationship and higher model performance. relative to the atmosphere. ... continuum of productivity. Fish production in these lakes is generally high, e.g. Land vs. lake productivity. 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