The Oligochaeta forms an important part of the macroinvertebrates inhabiting sediments of lotic ecosystems. It has an important role in the cycling of matter and energy transfer in these environments. The aim of this study is to analyse limnological variables, their influence on the structure and diversity of benthic oligochaete taxocenosis in a stretch of the Upper São Francisco River and its ...

Macroinvertebrate communities were compared in dredged and undredged areas of the St. Lawrence near Cape Vincent, N.Y., by sampling with a Ponar dredge in 3 seasons. No significant differences existed in numbers of Gammarus spp. and species of Oligochaeta between dredged and undredged areas. The chironomids Pseudochironomus and Stictochironomus spp. were significantly less abundant and Clinotan...

Oligochaeta Tubifex tubifex, fish fathead minnow (Pimephales promelas), hepatocytes isolated from rat liver and ciliated protozoan are absolutely different organisms and yet their acute toxicity indices correlate. Correlation equations for special effects were developed for a large heterogeneous series of compounds (QSAR, quantitative structure-activity relationships). Knowing those correlation...

function in the blackworm, Lumbriculus variegatus (Class Oligochaeta). This worm is being used at high school and college levels for student laboratory exercises and research projects. It has proven quite useful and reliable for studies of segment regeneration, circulatory physiology, locomotion, eco-toxicology, and neurobiology (Drewes, 1996a; Lesiuk and Drewes, 1998; Drewes and Cain, 1998). T...

Angiotensin (Ang) II upregulates body fluid volume in vertebrates; however, it produces varying effects in invertebrates. Ang II upregulates body fluid volume in clam worms and slugs organisms), but downregulates it in downregulating effect of Ang II in leeches is caused by their blood effects of Ang I and Ang II on body fluid volume in the freshwater sludge worm, (Annelida, Oligochaeta, Tubifi...