H. C. Duthie's research while affiliated with Allegheny College and other places

Publications (18)

Article
Full-text available
Recently, Ostrofsky and Duthie (1978) and Ostrofsky (1978a) have published a model, based on phsophorus budgets, which allows the prediction of the magnitude and duration of trophic changes following impoundment of a new reservoir. A summary is given of research on Smallwood Reservoir, Labrador, Canada, published between 1974 and 1980, emphasising...
Article
Phytoplankton of a humic and acidic lake in north eastern Quebec was studied during three years. Composition and succession are described. The biomass is very low and no distinct seasonal maximum was observed, the periodicity of various algal groups occurring in such a way that maximal populations succeed one another and do not co-exist.
Article
The productivity of three Shield lakes on Quebec's North Shore was found to be comparable with that of the most oligotrophic lakes known. Factors contributing to this condition may be that the moderately sized lakes of this study are deep relative to their surface areas, highly stained by humic substances, of very low conductivity, and contain litt...
Article
Leaching forest litter is the key nutrient source in the Smallwood Reservoir in Labrador, Canada. This 1974-1975 study tested a phosphorus dynamics hypothesis for predicting magnitude and duration of reservoir stages.-from Selected Water Resources Abstracts
Article
In a chemical investigation of the sediments of a small meromictic lake in southwestern Ontario, Canada, the hypolimnion had evidently become increasingly reductive over most of the postglacial as the lake gradually filled in. The ratio of phosphorus to organic matter tended to fall, suggesting that an increasing proportion of precipitated phosphor...
Article
The primary productivity of some lakes and reservoirs in western Labrador was measured by the 14C method in order to determine the range of productivities and the effects of impoundment. No primary productivity data previously existed for this part of Canada. Both the primary productivity and standing crops of phytoplankton were found to be low in...
Article
Phytoplankton primary production was measured for 148 days, from May 31 to October 25, 1971, in Sunfish Lake, Ontario, using the 14C light and dark bottle technique. The purpose of the experiment was not only to measure the rate of production but also to give some indication of the fates of the material produced by the algae. The following data wer...
Article
Two liquid scintillation fluors, the first using a 2-methoxyethanol/toluene solvent, the second a Triton X-100/toluene solvent, are discussed. Data presented indicate that the technique using the 2-methoxyethanol/toluene solvent produces higher d.p.m. than does solid support counting. The Triton X-100/toluene solvent fluor is suggested for measurin...
Article
This paper describes the diatom flora of the Grand River, Ontario, Canada. Samples were collected systematically from the river over a period of several years at tweleve stations. The diatom flora of the river is typical of temperate alkaline rivers. The flora is rich in species and variaties, and is similar to that from many parts from North Easte...

Citations

... It is evident that the consumption of DOM by heterotrophic microorganisms is closely connected to the production of DOM by phytoplankton (Waite and Duthie, 1975;Iturriaga and Hoppe, 1977;Weibe and Smith, 1977;Cole et al., 1982). But the turnover time of DOM in natural waters is very quick, only some hours. ...
... In temperate North America, palynological records show a close relationship between forest succession and Holocene paleoclimate [19][20][21][22]. Analysis of diatom assemblages in conjunction with pollen records has shown some synchronous shifts in diatom community structure, possibly in part the result of change in local catchment geochemistry brought on by vegetation change [23][24][25][26][27]. Soil development and vegetation succession affect lake water chemistry over both short [28] and long time-scales [29]. ...
... Following the construction of a dam, basic reservoir ontogeny is described as a succession of trophic phases including: a post-damming upsurge, a rapid depression as newly inundated nutrient sources decline, and finally a trophic re-equilibrium phase (Ostrofsky and Duthie 1978;Kimmel and Groeger 1986;Hall et al. 1999b;Turgeon et al. 2016). Despite being widely cited, this basic succession model is acknowledged to vary across the landscape. ...
... It is worth noting that the harbor is physically separated from the main basins of Lake Ontario by a sand bar and therefore does not necessarily reflect lake-wide conditions. Main Lake Region Duthie and Sreenivasa (1971) reported early qualitative evidence of the long-term trophic status of Lake Ontario based on changes in siliceous microfossils in a sediment core (E-30), collected in 1969 or 1971 as described by (Kemp et al., 1974) from the deep Rochester Basin. Diatoms in pre-European sediments were moderately abundant and included Cyclotella kutzingiana and Cyclotella ocellata which prefer oligotrophic waters ( Stoermer and Yang, 1970;Stoermer et al., 1996); Melosira italica subsp. ...
... are typical summer members of the plankton community in a wide variety of lake types (Heinonen, 1980). Dinobryon contributed 50% of the phytoplankton biomass in Canadian Shield lakes (Ostrofsky and Duthie, 1975). The genus has been a subject of many intensive studies, either autecological or as part of a phytoplankton community study, beginning in North America with Ahlstrom (1937). ...
... Although species of a few rarely reported genera have appeared in published checklists from various regions of North America (e.g., Meyer and Brook, 1969;Jacobs, 1971;Duthie and Socha, 1976;Duthie and Ostrofsky, 1978;Stein and Borden, 1979), few have been convincingly described with photographs, drawings, and critical text; consequently, a few of the genera listed below as being rare may be of doubtful North American occurrence. All North American members of the Phaeothamniophyceae (Part IV of the key, above) have been marked with the superscript "*" in Section V.B, below. ...
... For North American freshwater diatoms, particularly useful publications include the publications of Potapova Ponader and Potapova, 2007;Potapova and Hamilton, 2007;Enache and Potapova, 2012;Potapova, 2012) and Patrick and Reimer (1966), all primarily based largely on rivers in the eastern United States. Other publications are useful for dilute lakes (Camburn et al., 1984(Camburn et al., -1986, Utah (Johansen and Rushforth, 1981;Kaczmarska and Rushforth, 1983), Arizona (Czarnecki and Blinn, 1978), the Pacific Northwest (Sovereign, 1958(Sovereign, , 1963 the Laurentian Great Lakes (Stoermer and Yang, 1969;Kreis and Stoermer, 1979;Stoermer, 1980), Ontario (Sreenivasa, 1971;Duthie and Sreenivasa, 1972;Sreenivasa and Duthie, 1973), Hawaii (Lowe et al., 2009), and Alaska (Patrick and Freese, 1961;Foged, 1971). Some ecological works document the diatoms observed, though they are not primarily systematics studies (Cumming et al., 1995). ...
... Because the study began when the reservoir was being filled and before the water-treatment plant was completed, an opportunity existed to monitor the water quality prior to use of the reservoir as a drinking-water supply. In many instances (Duthie and Ostrofsky, 1982), filling and newly impounded reservoirs are in a nonsteady or nonequilibrium state and demonstrate immediate trophic surges that are not applicable to long-term trophic conditions. However, this condition occurs predominantly among those reservoir basins that are densely vegetated and subsequently flooded. ...
... Several other authors, however, sampled sediments to a much greater core depth. These include sediments sampled at seven lakes from 0 to 5 cm (Forbes and H i c h m 198 1; Kelly and Hite 198 I), six lakes from 8 to 10 cm (Adams and Duthie 1976;Dean and Gorham 1976;Keulder 1982), and 19 lakes from 0 to 20 cm (Bnmskill et al. 1971;Johnson et d. 1986). ...
... All investigated flagellates were more sensitive to UV stress than was the motile diatom Nitzschia linearis (Moroz et al. 1999). Cryptophytes are often dominant phytoplankton in brown fresh waters of Boreal and Arctic regions (Janus and Duthie 1979; Ilmavirta 1980 Ilmavirta , 1983 ; Lepistö and Rosenström 1998), where ice-free seasons are too short and too cold to mineralize seasonally accumulated organic matter. Such environments prevail over considerable regions of northern North America and Eurasia. ...