Titlebook: Aquatic Oligochaete Biology VIII; Proceedings of the 8 Pilar Rodriguez,Piet F. M. Verdonschot Conference proceedings 2001 Kluwer Academic P

BRIEF

Temporal pattern of the double sperm line production in Tubifex tubifex (Annelida, Oligochaeta)ogenesis of the two sperm lines which characterise this species. Starting from the second week after cocoon laying, we analysed the seminal vesicle content. We counted the cysts in the vesicles and arranged them into three classes: premeiotic, paraspermatids and euspermatids. Our results show that s

cutlery

针叶树

细丝

Pattern formation in embryos of the oligochaete annelid ,: cellular basis for segmentation and specil pairs of longitudinal coherent columns (bandlets) of primary blast cells which are generated by five bilateral pairs of embryonic stem cells called teloblasts (M, N, O, P and Q). As development proceeds, an initially linear array of blast cells in each ectodermal bandlet gradually changes its shap

退潮

BALK

Cocoon deposition of , Ohtaka (Tubificidae) in Lake Biwa, Japangs in a cocoon, and the substrate type and the position used for cocoon attachment. Cocoon deposition lasted from the beginning of January to the end of March, and peaked between mid-January and mid-February. Laboratory experiments showed that most . breed only once during their lifetime. In its nat

Demulcent

Utility and relevance of aquatic oligochaetes in Ecological Risk Assessmentult of exposure to contaminants or other stressors. EcoRA begins with problem formulation/hazard identification, progresses to effects and exposure assessment, and culminates with risk characterization (an estimate of the incidence and severity of any adverse effects likely to occur). Key components

Detonate

as a link in food chain transfer of hexachlorobenzene from contaminated sediment to fishd by endobenthic, sediment-ingesting invertebrates. Some tubificid species — or other benthic annelids — serve as food for benthivorous fish, which thereby ingest the sediment-borne chemicals and may accumulate contaminant concentrations far higher than from water exposure only, and transfer them to

expeditious

厌食症