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Toxicity of four oil dispersants to some animals from the Baltic Sea
Four oil dispersants of interest for practical use in the Baltic Sea were tested as regards toxicity to animals from the littoral zone of the same area and significant differences in toxicity were found between the water-base dispersants at concentrations above 1700 ppm.
Adaptation to an acid environment in Chironomus riparius (Diptera, Chironomidae) from Smoking Hills, NWT, Canada
The hemoglobin content of the Canadian larvae was found to be twice as high as that of the same species from Sweden, which explained their high abundance.
Overwintering at low oxygen concentrations in the mayfly Leptophlebia vespertina
Investigation of the survival of L. vespertina (L.) nymphs in three humic forest ponds in southern Norway found that they are both positively phototactic and negatively thermotactic in low oxygen concentrations, coupled with an ability to withstand short-term anoxia.
Overwintering strategy of two closely related forms of Cloeon (dipterum?) (Ephemeroptera) from Sweden and England
- B. Nagell
- Environmental Science
- 1 June 1981
Evidence is presented that low temperatures but not decreasing photoperiod are decisive for the final induction of hibernation in the larvae.
On the structure and function of the ventral tubuli of some Chironomus larvae (Diptera, Nematocera)
The ultrastructure of the walls of the tubuli of larvae of two Chironomus species living in lakes and four species from small ponds were studied, suggesting a reinforcement of the concept of a respiratory function and a hypothesis is discussed which might explain the differences found between the Tubuli of lake- and pond-dwelling species.
Resistance to anoxia of Chironomus plumosus and Chironomus anthracinus (Diptera) larvae
There was no statistically significant difference between the survival in anoxia and in aerated water, which indicates that the main reason for death inAnoxia is not the absence of oxygen, and this main reason is presumed to be starvation.
The oxygen consumption of mayfly (Ephemeroptera) and stonefly (Plecoptera) larvae at different oxygen concentration
- B. Nagell
- Biology, Environmental ScienceHydrobiologia
- 1 September 1973
The basic picture obtained is a set of oxygen consumption values scattered between a curve connecting highest values obtained and a curve of the standard metabolism together with a zone in which the larvae are activated by reduced oxygen concentrations.
Critical oxygen demand in Plecoptera and Ephemeroptera nymphs as determined by two methods
The main explanations proposed for this were an increase of the internal metabolism that was measured to about 30% and an increased diffusion resistance to oxygen of the nymphal cuticle.
Influence of the Season and of Preservation Methods on Wet‐ and Dry Weights of Larvae of Chironomus plumosus L
The results indicate that formaldehyde can chemically react with the larvae, thereby increasing their dry weight, and the percent ratio of dry weight to live weight decreased during the summer.
Survival of Cloeon dipterum (Ephemeroptera) larvae under anoxic conditions in winter
- B. Nagell
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