Ökologische und biometrische Untersuchungen an Chironomus-Larven (Diptera) des Wohlensees bei Bern

Reist, A; Fischer, J.

doi:10.5962/bhl.part.82346

Cited by 7 publications

(8 citation statements)

References 3 publications

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“…Hence, the addition of 15 larvae per core increased the effective surface area by about 60%. Fifteen larvae per core correspond to 3000 larvae m −2 , an abundance that can be observed and often surpassed in many natural habitats [15, 25].…”

Section: Methodsmentioning

confidence: 96%

The effect of chironomid larvae on production, oxidation and fluxes of methane in a flooded rice soil

Kajan

Frenzel

1999

FEMS Microbiology Ecology

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Tube‐dwelling invertebrates affect microbial processes by feeding on sediment bacteria, by creating structures with properties different from that of the bulk sediment, by disturbing the benthic boundary layer, and by pumping water through their tubes. We studied the effects of Chironomidae in a flooded soil. Tubes were at least 1.5 cm long and ca. 2 mm in diameter, and extended through the anoxic subsurface soil over most of their length. Larvae had no effect on CH4 flux across the sediment surface either by diffusion or by ebullition. In vitro, CH4 oxidation rates in tubes were significantly (P<0.05) higher than those in surface and subsurface soil. At a mixing ratio of 20 000 ppmv, average CH4 oxidation rates of tubes, surface soil, and bulk soil were 2, 0.4, and 1 μmol g dry wt.−1 h−1, respectively. The number of CH4 oxidizing bacteria determined by the most probable number (MPN) technique was higher in chironomid tubes than in the other soil compartments. CH4 production in tubes was significantly (P<0.05) higher than in the anoxic bulk soil, while no CH4 was produced in the surface soil during 240 h of incubation. We conclude that chironomid tubes are microsites with an intensified microbial activity, where CH4 production and oxidation may be tightly coupled.

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Section: Methodsmentioning

confidence: 96%

The effect of chironomid larvae on production, oxidation and fluxes of methane in a flooded rice soil

Kajan

Frenzel

1999

FEMS Microbiology Ecology

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“…Chironomus plumosus and C. nuditarsis (C. plumosus larval type) can be distinguished from one another by the external appearance and number of striae on the ventromental plates (rough appearance and higher number in C. plumosus) and the presence of outer hooks on the outer surface in C. plumosus (Table 1), which is only seen with scanning electron microscopy (SEM) (Webb, Scholl & Ryser, . yData from Reist & Fischer (1979). 1985.…”

Section: Comparison Of Larval External Morphology and Cytotaxonomymentioning

confidence: 99%

Chironomus species (Diptera: Chironomidae) in the profundal benthos of Spanish reservoirs and lakes: factors affecting distribution patterns

2000

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SUMMARY The taxonomy, distribution and habitat preferences of Chironomus larvae from profundal benthos of reservoirs and natural lakes in Spain are presented. The 114 water bodies studied were medium to large reservoirs and lakes throughout Spain, and were visited on at least two occasions (summer and winter). Out of the natural lakes investigated, Chironomus larvae were found only in one karstic lake (Banyoles), and to date, these have not been found in the high mountain lakes of the Spanish Pyrenees or Sierra Nevada, or in Spain's largest oligotrophic lake (Sanabria). Multiple regression with environmental data from reservoirs showed that the density of Chironomus larvae was inversely correlated with water depth, temperature and sulphide content of the bottom water, but positively correlated with alkalinity and particulate organic nitrogen (PON) content of bottom water. Thus, the density of Chironomus larvae was higher in shallow reservoirs from the eastern part of Spain (calcareous water and higher PON), but markedly lower in southern reservoirs (higher temperature and higher sulphide). According to morphological and cytological characteristics, three species of this genus have been identified in the samples examined: C. bernensis, C. plumosus and C. nuditarsis. Reasons for the absence of other widespread European species are discussed. Using canonical correspondence analysis to relate species and environmental variables, C. bernensis showed a significant preference for reservoirs with higher oxygen concentrations in bottom water and lower total reactive phosphorus (TRP) content at the surface than those reservoirs where C. plumosus‐type were found. This suggests that the smaller C. bernensis prefers mesotrophic reservoirs and the larger C. plumosus‐type (C. plumosus + C. nuditarsis) prefers eutrophic reservoirs. Taking into account the TRP/depth index for those samples collected at depths below the thermocline, and thus, where oxygen can be a limiting factor, C. bernensis and C. nuditarsis were present in reservoirs in which the index was low (< 1:170 for C. bernensis and >1:800 for C. nuditarsis), while C. plumosus thrived in reservoirs with higher index values (<1:20). These differences may reflect the preference of C. bernensis and C. nuditarsis for detrital material, while C. plumosus prefers phytoplankton. These observations are in agreement with the depth distribution of each species: C. plumosus was restricted to reservoirs less than 46 m deep, whereas the other two species (i.e. C. bernensis and C. nuditarsis) were found up to depths of 65 and 80 m, respectively. Data from a transect (5–20 m deep) in Lake Banyoles are consistent with the general pattern described in reservoirs. In this lake, a high density of C. bernensis was recorded from littoral and sublittoral areas with abundant oxygen (above or close to the thermocline), whereas C. plumosus was scarce in several parts of the lake, especially in oxygen‐deficient areas during the summer. This karstic, oligotrophic lake has a low TRP/depth index,...

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“…Fourthinstar larvae were collected in the rearing aquaria using a hand net (mesh size, 0.25 mm). Larval instar was determined using head capsule size [26,27]. At the beginning of the experiment, 2 ml of an acetonic solution of fenitrothion (Cluzeau Info Labo, Sainte Foy la Grande, France) were added to the experimental tanks.…”

Section: Methodsmentioning

confidence: 99%

Multilevel effects of sublethal fenitrothion exposure in Chironomus riparius Mg. (Diptera, Chironomidae) larvae

Choi

Caquet

Roche

2002

Enviro Toxic and Chemistry

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The effects of fenitrothion exposure on fourth-instar Chimnomus riparius larvae were investigated on biochemical, physiological, and population-level parameters. Biochemical effects were investigated through measurements of acetylcholinesterase and cytosolic superoxide dismutase activities. Water content and dry weight of the larvae were used as physiological parameters, and the emergence rate of adults was used as a descriptor of population-level effects. Results showed that the response of most parameters exhibited a concentration-dependent relationship. Although biochemical parameters proved to be very sensitive, no direct relation was observed with effects at a higher level of biological organization. Perturbations of osmoregulation, as reflected by changes in water content of the larvae, were more directly related with emergence failure. This study demonstrates that the use of several biological parameters can provide complementary information about the effects of chemical exposure. Therefore, use of a multilevel approach in C. riparius seems to be a promising way to diagnose environmental quality.

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Ökologische und biometrische Untersuchungen an Chironomus-Larven (Diptera) des Wohlensees bei Bern

Abstract: A. REIST UND J. FISCHER diesen Populationen untersucht werden, welches die Überwinterungsstadien sind. Reist, A and Fischer, J. 1979. "Ökologische und biometrische Untersuchungen an Chironomus-Larven (Diptera) des Wohlensees bei Bern." Revue suisse de zoologie 86, 893-899.

Cited by 7 publications

References 3 publications

The effect of chironomid larvae on production, oxidation and fluxes of methane in a flooded rice soil

The effect of chironomid larvae on production, oxidation and fluxes of methane in a flooded rice soil

Chironomus species (Diptera: Chironomidae) in the profundal benthos of Spanish reservoirs and lakes: factors affecting distribution patterns

Multilevel effects of sublethal fenitrothion exposure in Chironomus riparius Mg. (Diptera, Chironomidae) larvae

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