Search for dissertations about: "Three-spined stickleback"

Showing result 1 - 5 of 28 swedish dissertations containing the words Three-spined stickleback.

2. 1. The juvenile three-spined stickleback : model organism for the study of estrogenic and androgenic endocrine disruption in laboratory and field

   Author : Edda Hahlbeck; Bengt-Erik Bengtsson; Poul Bjerregaard; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; endocrine disruption; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

   Abstract : Industrial and domestic sewage effluents have been found to cause reproductive disorders in wild fish, often as a result of the interference of compounds in the effluents with the endocrine system. This thesis describes laboratory-based exposure experiments and a field survey that were conducted with juveniles of the three-spined stickleback, Gasterosteus aculeatus. READ MORE

4. 2. Reproductive physiology of the female three-spined stickleback, Gasterosteus aculeatus

   Author : Chrysoula Roufidou; Bertil Borg; Geir Lasse Taranger; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; overripening of eggs; spawning cycle; brain-pituitary-gonad BPG axis; vitellogenin; ovarian fluid; sex steroids; reproduction; three-spined stickleback; Gasterosteus aculeatus; fish; funktionell zoomorfologi; Functional Zoomorphology;

   Abstract : Reproduction in vertebrates, including fishes, is under control of the brain-pituitary-gonad (BPG) axis. The female three-spined stickleback, Gasterosteus aculeatus, produces egg clutches at intervals of a few days and spawns them in a nest built by male. READ MORE

5. 3. The brain-pituitary-gonadal axis of the three-spined stickleback, Gasterosteus aculeatus

   Author : Yi Ta Shao; Bertil Borg; Sylvie Dufou; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; BPG axis; GnRH; lh-β; fsh-β; three-spined stickleback; Gasterosteus aculeatus; homeostasis; feedback; funktionell zoomorfologi; Functional Zoomorphology;

   Abstract : The seasonal reproduction of the three-spined stickleback is stimulated by long day photoperiod. As in other vertebrates, the reproductive system of stickleback is regulated by the brain-pituitary-gonadal (BPG) axis which is largely controlled by feedback effects. Both negative and positive feedback effects on the BPG axis have been found in fish. READ MORE

6. 4. Progestagenic Aquatic Contaminants Act as Potent Androgens in Fish : Experimental Studies in Three-spined Stickleback and Zebrafish

   Author : Johan Svensson; Björn Brunström; Ingvar Brandt; Ian Mayer; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Pharmaceuticals as contaminants; Progestins; Androgenic properties; Fish; Biologi med inriktning mot ekotoxikologi; Biology with specialization in Environmental Toxicology;

   Abstract : The extensive use of pharmaceuticals and their poor removal by wastewater treatment plants has led to the emergence of pharmaceutical compounds as global aquatic contaminants. Progestins, the synthetic analogues to progesterone (P4), are receiving increasing attention as contaminants and have been shown to impair reproduction in fish and amphibians at low ng L-1 concentrations. READ MORE

7. 5. Role of 11-ketotestosterone and prolactin in the control of reproductive behaviour in the male three-spined stickleback, Gasterosteus aculeatus

   Author : Miklós K. Páll; Rui Oliveira; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; reproductive behaviour; three-spined stickleback; Gasterosteus aculeatus;

   Abstract : The male three-spined stickleback, Gasterosteus aculeatus, builds a nest by glueing plant material together using an 11-ketotestosterone (11kT) induced protein (spiggin) secreted from the kidney. When females have been induced to lay eggs in the nest, male sexual (zigzag) behaviour decreases and parental care (fanning) increases. READ MORE