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  • 1
    Electronic Resource
    Electronic Resource
    Phytoplankton and their Dynamics in Oligotrophic and Eutrophic Lakes (1978)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 9 (1978), S. 475-495 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.es.09.110178.002355
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of macrophyte beds on plankton communities and their export from fluvial lakes in the St Lawrence River (2000)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 45 (2000), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. To determine the influence of macrophyte beds on plankton abundance within fluvial lakes of the St Lawrence River, planktonic components (macrozooplankton, heterotrophic bacteria, and phytoplankton as chlorophyll-a [Chl-a]) were sampled in Lake St Francis and Lake St Pierre during summer 1998. We tested the hypothesis that the abundance of planktonic components was higher within macrophyte beds in comparison to the more rapidly flushed open water areas of the fluvial lakes. 
2. The large cross channel variation in zooplankton biomass was indeed correlated with the presence of dense beds of submerged macrophytes. Total macrozooplankton biomass was nine-fold greater within the beds (mean=180 μg L−1 dry mass) than in either the open water or areas with only sparse vegetation (mean=20 μg L−1 dry mass). 
3. Chl-a and heterotrophic bacterial abundance were also higher in the beds, but only slightly so. There was no difference in total phosphorus or dissolved organic carbon concentrations between areas of dense vegetation, sparse vegetation or open water. 
4. Macrophyte beds on the margins of the fluvial lakes allow the development of high planktonic abundance relative to the fast flowing central channel. Macrozooplankton biomass was much higher at the outflows of the lakes (∼50 μg L−1 dry mass) in comparison to the inflows (〈20 μg L−1 dry mass). The increase is due to the transfer of organisms from submerged macrophyte beds into the central channel in the downstream quarter of the two lakes where the marginal littoral waters enter central channel waters. 
5. Along rivers, shallow fluvial lakes appear to act as sources of plankton which is exported downstream during years of extensive littoral macrophyte development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2000.00635.x
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  • 3
    Electronic Resource
    Electronic Resource
    Weight-density relationships in submerged macrophytes (1987)
    Springer
    Oecologia 72 (1987), S. 612-617 
    Details
    ISSN: 1432-1939
    Keywords: Submerged macrophytes ; 3/2 law ; Submerged-terrestrial plant comparison ; Light levels ; Growth form
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Crowded stands of submerged plants in Québec lakes have a weight-density with a shallower, but not significantly different, slope and an intercept 10 fold lower than those for terrestial stands. The examination of a larger data set including both freshwater and submerged macrophytes supported these differences. This data set suggested that those differences, as well as those among submerged stands, are largely attributable to the light levels incident upon the stand. The differences in weight-density relationships between submerged and terrestrial stands were paralleled by a smaller biomass per unit volume outgrown of the submerged plants, as predicted from the dimensional examination of the weight-density relationship. The variations in biomass per unit volume associated to differences in the species growth form explained deviations about the weightdensity relationship of stands growing under relatively similar light conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378990
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  • 4
    Electronic Resource
    Electronic Resource
    Phosphorus limitation in some tropical African lakes (1983)
    Springer
    Hydrobiologia 100 (1983), S. 101-112 
    Details
    ISSN: 1573-5117
    Keywords: nutrient limitation ; phosphorus ; nitrogen ; phytoplankton biomass ; tropical lakes ; Kenya
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two of three Kenyan lakes studied between November 1979 and October 1980 have very short 33PO4 turnover times, indicating a high phosphorus (P) demand throughout the year. The P turnover time in Lakes Oloidien and Sonachi is as rapid as in the most P deficient temperate zone lakes. The third lake, Lake Naivasha, has a lower overall P demand and a wide seasonal range, with lowest demand between November 1979 and February 1980 when a P deficiency was unlikely. On an annual basis the Lake Naivasha status is, however, not statistically different from that recorded during the summer in Lake Memphremagog, a generally P-limited temperate zone lake. Lake Naivasha and Lake Oloidien fit well to the line of best fit for the Dillon-Rigler relationship relating total phosphorus (TP) and chlorophyll a derived in temperate zone lakes. Thus, temperate zone models predicting aspects of lake behaviour on the basis of TP may also be applicable to these two tropical lakes. Saline lake Sonachi had not only a short P turnover time but also responded dramatically to the fertilization of enclosures with P. However, it does not fit the TP-chla or the total nitrogen-chla plots from the temperate zone. This suggests that, in this saline lake at least, much of the TP is unavailable to the algae, with some of it in a particulate form that is readily extracted with boiling water. The epilimnetic N:P ratios also characterize lakes Oloidien and Sonachi lakes as highly P deficient and lake Naivasha as more moderately P limited. A single set of measurements in Winam Gulf (Lake Victoria) also showed a rapid P turnover time and thus P limitation, but as in lake Sonachi much of the TP was in a non-algal particulate form. Occasional measurements in three other hypertrophic and saline lakes suggest them to be primarily light limited on the basis of their very high photosynthetic cover. These findings support the hypothesis of a primary P limitation for those lakes not light limited, and contradicts literature suggestions that nitrogen is the primary limiting element in tropical lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027425
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  • 5
    Electronic Resource
    Electronic Resource
    Phytoplankton and its dynamics in two tropical lakes: a tropical and temperate zone comparison (1986)
    Springer
    Hydrobiologia 138 (1986), S. 161-176 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton species ; biomass ; nannoplankton ; seasonal cycles ; Kenyan lakes ; tropical-temperate comparison
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Temporal patterns of phytoplankton biomass and community structure are described for two Kenyan lakes and subsequently compared with patterns reported in other tropical and temperate lakes. Lake Naivasha had a lower and more seasonally variable (10×) biomass, with a seasonal shift between diatoms and blue-greens, while the L. Oloidien biomass was less variable (3.7×) and dominated by blue-greens. Biomass and chlorophyll a were strongly correlated and in turn were coupled to the level of total phosphorus. A total of 143 and 94 taxa were described for L. Naivasha and L. Oloidien, respectively. The comparative analysis showed: a) a paucity of exclusively tropical species; b) that more than 30 percent of the species in two highly saline Kenyan lakes were also present in the two freshwater lakes; c) no evidence for a postulated decline of phytoplankton species abundance with latitude from the temperate zone to the tropics; d) that the low fraction of chrysophyte biomass in tropical lakes is a function of trophy rather than of latitude; e) that the fraction of chlorophyte biomass in tropical lakes is generally higher than in temperate lakes; f) that the proportion of nannoplankton in the two Kenyan freshwater lakes is not different from that in temperate lakes of the same trophy; g) that seasonal or annual biomass oscillations in the tropics are not systematically lower than in the temperate zone; h) evidence for large inter-year difference in the max.:min. biomass ratio in the only tropical lake (L. Naivasha) for which such data are available; i) that an average biomass ratio appears predictable for tropical lakes from the proportion of the sediment surface in contact with epilimnetic water. Overall, no evidence was found that the freshwater tropical phytoplankton composition or dynamics differ in any fundamental fashion from that observed in the temperate lakes during the summer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027238
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  • 6
    Electronic Resource
    Electronic Resource
    Predicting sediment metal concentrations in lakes without point sources 1 (1993)
    Springer
    Water, air & soil pollution 66 (1993), S. 145-161 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Surficial sediments (0 to 2 cm) from 189 sites in 52 Quebec and Ontario lakes were analyzed for Al, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn by atomic adsorption spectrometry after extraction in dilute aqua regia. Empirical models using sediment texture (water content), site morphometry (depth) and geology (categorical variables) as predictors explain 82 to 87% of the between-site and between lake variation in sediment concentrations of Cu, Cr, Ni, Pb, and Zn, and 52 to 68% of the variation of Al, Co, Fe, and Mn. Over a broad geologic range, geologic variables are only significant in models predicting Co, Cr, and Ni. These three elements are low in concentration in lakes with catchments on the Grenville shield, while Cr and Ni are enriched in catchments containing ophiolite geology. These models explain both between-site and between-lake variation in sediment metal concentrations, and due to the lack of geologic influence on most metals, may be valid for other regions. The models appear promising as a means to identify point source contamination without assumptions about the relevant sediment fractions or inter-element relationships.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00477066
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  • 7
    Electronic Resource
    Electronic Resource
    Seasonal changes in the epiphyte community of natural and artificial macrophytes in Lake Memphremagog (Que. & Vt.) (1978)
    Springer
    Hydrobiologia 60 (1978), S. 135-144 
    Details
    ISSN: 1573-5117
    Keywords: epiphytes ; artificial substrates ; seasonal succession
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal changes in the epiphyte biomass, measured both as chlorophyll a and as cell volume, and species composition were compared on Potamogeton richardsonii and on a similar plastic plant ‘grown’ together in a shallow bay of Lake Memphremagog (46°06'N, 72°16′W). Both substrates exhibited two periods of high biomass during the June to September growing season; one in June, when the community was dominated by loosely attached species with a strong planktonic component (up to 37%), and one in September, when the epiphytes were characterized by species tightly attached to the leaves. Although this seasonal trend was similar, the loosely and tightly attached communities were best developed on the natural and artificial plants, respectively. The diversity of the epiphytes was significantly higher on the natural than on the artificial leaves from July on. Both the diversity differences and differences in community structure appear to be the result of the summer accumulation of CaCO3 observed only on the upper leaf surfaces of the natural plants. Consequently, P. richardsonii appears to affect epiphyte development largely by its precipitation of CaCO3, with no evidence for either direct inhibition or stimulation of the epiphytes by the natural plants. The reduced epiphyte biomass on growing tips was no different from that on artificial plants of the same age and exposure and is attributable to an insufficient time for colonization rather than to inhibition by the macrophyte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163179
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  • 8
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    Phytoplankton and its dynamics in two tropical lakes: a tropical and temperate zone comparison (1986)
    Springer
    Details
    Publication Date: 1986-08-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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  • 9
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    Seasonal changes in the epiphyte community of natural and artificial macrophytes in Lake Memphremagog (Que. & Vt.) (1978)
    Springer
    Details
    Publication Date: 1978-08-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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  • 10
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    Phosphorus limitation in some tropical African lakes (1983)
    Springer
    Details
    Publication Date: 1983-01-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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