Pelagic production

Even within the subset of boreal lakes there is probably a direct relationship between external inputs of organic matter and their importance to zooplankton (Meili, M. Fry, B. Kling, G. W. unpublished data). In the case of Lake N2 and other upland arctic lakes, thermokarst processes and active erosion of shoreline peat banks are much less important than they are in coastal plain lakes (62, 75, 103). In addition, DOC made up less of the total organic carbon in Lake N2 than it did in the humic lake studied by Hessen (72) the ratio of DIC DOC.POC in Lake N2 was 25 8 1 (Table II), whereas in the humic lake the ratio was 1.6 21 1. The lower loading rates of particulate carbon and the smaller relative amounts of DOM in Lake N2 may explain the observation that pelagic productivity depended mainly on new algal production. 

Despite our limited knowledge of die sea ice system and its associated organisms, the sea ice is a key polar ocean marine habitat that also affects benthic and pelagic production. 

What is the role of marine biota and benthic-pelagic coupling in the carbon cycling and primary production ... 

Shannon, L.V. and Field, 3.G., 1985. The relation between phytoplankton production and pelagic fish in the South Benguela region. Mar. Ecol. Prog. Ser. (in press). 

FIGURE 3 Proportion of lake area accounted for by littoral zones for the world s lakes (a), and the proportion of extracellular (ER) dissolved organic matter inputs derived from littoral zones (b see text for description of the model). The solid lines illustrate relationships in which lake boundaries are restricted to littoral and pelagic zones and the dotted lines illustrate patterns in which lake boundaries are expanded to include adjacent wetlands. In (b), the two sets of lines illustrate the range in the contribution of littoral zones to total lake ER with variation in rates of primary production for phytoplankton (0.1-2.0 kg organic matter m-2 yr 1) and macrophytes (0.6-3.8 kg organic matter nT2 yr 1). The relationship between littoral zone area and number of lakes is from Wetzel (1983). 

Fischer, H., and M. Pusch. 2001. Comparison of bacterial production in sediments, epiphyton, and the pelagic zone of a lowland river. Preshwater Biology 46 1335-1348. 

Ploug, H., and H.-P. Grossart. 1999. Bacterial production and respiration in pelagic aggregates — A matter of the incubation method. Aquatic Microbial Ecology 20 21-29. 

Volovik, S.P. (1975). Influence of climatic and anthropogenic factors on the structure and production of pelagic fish communities in the Azov Sea (In Russian). Trudy VNIRO103,107-119. 

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