The effects of preservatives on the regurgitation of gut contents by Chironomidae (Diptera) larvae

  title={The effects of preservatives on the regurgitation of gut contents by Chironomidae (Diptera) larvae},
  author={Ronald W. Davies and Victor J. E. McCauley},
  journal={Canadian Journal of Zoology},
The commonly used preservatives for chironomid larvae were found to cause regurgitation of the gut contents, the incidence of regurgitation being higher when the gut in at least two of the thoracic segments was full. The Tanypodinae larvae regurgitated more frequently than others, because of differences in their gut morphology, the nature of the food ingested, or a combination of both. Handling of the larvae also caused regurgitation. Increased predation by Tanypodinae larvae appeared if there… Expand
Food preferences of tanypodinae larvae (Diptera: Chironomidae)
It was concluded that although Tanypodinae larvae are primarily predators with definite food preferences in ideal foraging conditions, in adverse conditions they will utilize a range of available stand-by foods, the most important of which appears to be detritus. Expand
Field and laboratory studies showed that larvae tend to ingest particles in the proportions available in the environment and that populations apparently were food-limited, and the amount and size distribution of food particles strongly affect the distribution of stream-living chironomids in space and time. Expand
Particulate material and midge larvae (Chironomidae: Diptera) in an upland river
The density of midge larvae (Chironomidae), which dominate the stone-surface fauna (81.3 ± 4.9% of the community by number) in an upland stream in northeast England is regulated by the amount ofExpand
Oral exudate as a mediator of behavior in larval eastern and western spruce budworms (Lepidoptera: Tortricidae)
The behavior induced by the oral exudate indicates that it acts as an epideictic (spacing) pheromone in spruce budworms, and, apparently, increased the larval sensitivity to disturbances. Expand
Bioactivity and characterization of spruce budworm larval oral exudate
TheExudate was not repellent at <1 larval equivalent, suggesting that larvae which produce small amounts of exudate will not repel competitors effectively, and could be frozen for at least a week with no reduction in bioactivity. Expand
Trophic dependencies of some larval chironomidae (Diptera) and fish species in the River Thames
The importance of detritus in the river system, from the tripton to the fish via the chironomids, underlines the role of planktonic first instar larvae. Expand
Repellency of oral exudate to eastern and western spruce budworm larvae (Lepidoptera: Tortricidae)
Results indicated that feeding behavior on artificial diet-drop feeding stations was modified in the presence of exudate, with feeding stations treated with conspecific exudates being avoided when an untreated station was available 3 cm away. Expand
Qualitative analyses of larval oral exudate from eastern and western spruce budworms (Lepidoptera: Tortricidae)
The exudate from insects reared on either artificial diet or foliage was active at a volume equal to the amount emitted by one larva when disturbed with a pipet in the laboratory, but repellency was lost at lower doses. Expand
Quantifying individual fruit fly consumption with Anastrepha suspensa (Diptera: Tephritidae).
A precise dye-based technique for the quantification of consumption by individual adult A. suspensa fruit flies will be useful in comparing consumption in phagostimulant studies, estimating dose in oral toxicity tests, differentiating behavioral and physiological resistance in toxicant Studies, ultimately leading to improved bait/pesticide methods and reduced environmental impact of area wide fruit fly eradication programs. Expand
Calorific values of Chironomidae (Diptera).
Calorific determinations were made on the larvae of 9 species, and on the pupae and adults of 10 species, of Chironomidae from Marion Lake, British Columbia. Combination of these data with those inExpand