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Lake Oguta is a relatively small, shallow fresh water body (flood season maximum surface area=2.48 km2; max. depth=9.30 m) but the largest natural lentic system in Southeastern Nigeria. The maximum water depth, surface water temperature, Secchi-disc-transparency and conductivity, varied...
The error inin vivo
14C incubator measurements of primary production in the Eastern Scheldt when neutral density filters were used and the error obtained when no account was taken of the spectral changes in submarine irradiance that occur with increasing depth, were evaluated theoretically. By...
The environmental conditions in laminated microbial sediment ecosystems on the island of Schiermonnikoog (The Netherlands) were monitoredin situ over 24-hour periods by using micro-electrodes. In the layer of purple sulfur bacteria dramatic diel aerobic/anaerobic shifts occurred, whereas the top...
The cold oligo-eurytherm diatomsCoscinodiscus concinnus W. Smith andRhizosolenia setigera Brightwell were cultured to determine their best competitive position by growth. Comparison of their generation times with those of other diatoms indicate that they reach this position between 6°C and 12°C....
The warm oligo-eurytherm diatomsRhizosolenia robusta Norman andRhizosolenia imbricata Brightwell were cultured to determine the temperature range for the best competitive position by growth. Comparison of their generation times with those of other diatoms indicate thatR. robusta reaches this...
The production rate ofEichhornia crassipes was stimulated by water of the river Ganga and by prevailing environmental conditions. It was highest in October (4.76 g.m−2.d−1) and was positively correlated with ammonia nitrogen and total phosphorus in the water but negatively correlated with total...
The biomass formation ofAzolla was greatly enhanced by water of the River Ganga and by prevailing environmental conditions. It increased gradually from January to April (first maximum 2.409 g.m−2.day−1), declined during June (1.185 g.m−2.day−1), and reached a second its maximum during September...
A study on the profundal chironomids of the artificial Lake Campotosto (Central Italy) was carried out during the summer/early autumn of 1983 and 1984, in order to analyse their composition and community structure in relation to the lake trophic level assessed by water chemical analysis.
The analysis of gut contents ofAmphichaeta leydigii, found for the first time in Italy in sandy shores of Lake Vico (Central Italy), proved grazing of the species on diatoms (Centrales and Pennales). Detritus and organic particles, abundant in the substratum, were observed only in small amounts.
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