| The influence of water-level fluctuation on the drift of Simulium chutteri Lewis, 1965 (Diptera, Nematocera) in the Orange River, South Africa. | |
| | |
MedLine Citation:
|
PMID: 6646658 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
In July 1982, the invertebrate drift at Marksdrift comprised 98, 7% Simulium chutteri; 0, 75% Chironomidae; 0, 3% Ephemeroptera; 0, 15% Copepoda, and 0, 1% Trichoptera. Simuliid eggs were found in only 6 out of 75 samples. A single water-level reduction of 57 cm (54%) resulted in a more than sixfold increase of S. chutteri larvae in the drift and a more than 50% decrease of 1st and 2nd instar larvae in the drift after the water had returned to its original level. Larvae found lying in pools after the water-level had dropped belonged mainly to instars 5-7, 70% of them showing symptoms of starvation after 3 days when the river had risen again. The drift of simuliid head capsules decreased when the larval drift increased, as fewer simuliid larvae moulted when they had been disturbed. The low drift of eggs and the presence of very few pupae and adults indicated that most of the S. chutteri population was in the larval stage and that July was therefore an ideal month for water-level manipulation. Its main effect was achieved by irritating larger larvae and thus preventing them from resettling. |
| | |
Authors:
|
M Car |
Related Documents
:
|
22957868 - An experimental study of the multiple effects of brown trout salmo trutta on the bioene... 23244538 - Low and high homocysteine are associated with mortality independent of b group vitamins... 10079128 - Cold hardiness adaptations of codling moth, cydia pomonella 2724318 - Factors influencing ingestion of particulate materials by mosquito larvae (diptera: cul... 2083408 - Symptoms of respiratory allergies are worse in subjects with coexisting food sensitizat... 16616988 - Determination of voc source signature of vehicle exhaust in a traffic tunnel. |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: The Onderstepoort journal of veterinary research Volume: 50 ISSN: 0030-2465 ISO Abbreviation: Onderstepoort J. Vet. Res. Publication Date: 1983 Sep |
Date Detail:
|
Created Date: 1984-01-27 Completed Date: 1984-01-27 Revised Date: 2003-11-14 |
Medline Journal Info:
|
Nlm Unique ID: 0401107 Medline TA: Onderstepoort J Vet Res Country: SOUTH AFRICA |
Other Details:
|
Languages: eng Pagination: 173-7 Citation Subset: IM |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Diptera / isolation & purification* Fresh Water* Larva South Africa Time Factors Water* Water Movements |
| Chemical | |
Reg. No./Substance:
|
7732-18-5/Water |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Studies on the parasites of zebra. II. Cylicostephanus longiconus n. sp. (Nematoda: Stronglyidae) fr...
Next Document: Haemonchus contortus from the vaal ribbok, Pelea capreolus, and the bontebok, Damaliscus dorcas dorc...