رسالة جامعية
An Investigation into the effects of reproductive endocrine disrupters on the sexual behaviour and morphology of male Mosquitofish, Gambusia sp.
| العنوان: | An Investigation into the effects of reproductive endocrine disrupters on the sexual behaviour and morphology of male Mosquitofish, Gambusia sp. |
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| المؤلفون: | Gray, Lorraine Fiona |
| سنة النشر: | 2003 |
| المجموعة: | Edinburgh Napier Repository (Napier University Edinburgh) |
| مصطلحات موضوعية: | Effluent, Sewage Treatment Plants, endocrine disrupting chemicals (EDCs), gonadal hormones, reproductive endocrine disruption, 571 Physiology & related subjects, QH301 Biology |
| الوصف: | It has recently been acknowledged that effluents from sewage treatment plants (STPs)are one potential source of endocrine disrupting chemicals (EDCs). This diversegroup of chemicals can include environmental oestrogens or exoestrogens, substancesthat mimic or antagonise gonadal hormones. These are of particular concern becausethey are known to impair the sexual development and reproductive success ofvertebrates, including fish. It is well established that reproductive behaviours areregulated by endogenous hormone concentrations, yet there has been very little workconducted on the effects ofthese EDCs on behaviour. The experiments described inthis thesis investigate the reproductive behaviour and morphology of adult malemosquito fish (Gambusia sp.) which have been exposed in the laboratory to low levelsof oestrogens, an oestrogen mimic and sewage effluent and also exposed undernatural conditions through inhabiting two sewage contaminated rivers in NSW,Australia. All males were observed for reproductive behavioural characteristics in astandard observation procedure, and several reproductive characteristics were alsorecorded: gonopodium length (GPL), gonadosomatic index (GSI: testis to bodyweight ratio), testis area (TA mm3), body condition index (BCI: using Fulton'scondition factor - body weight x 100 / body length3), and number ofspermatozeugmata, or SPZ (visible sperm packets).Adult male mosquito fish were exposed to 0.4, 2 and lOng/1 diethylstilbestrol (DES),20, 100 and 500ngll 17~-oestradiol (E2) and 2, 10 and 50~gll octylphenol (OP) for 8-10 weeks in the laboratory. These experiments demonstrated significant reductions inthe reproductive behaviour of exposed males compared to controls, but no consistenttreatment effects on the other reproductive characteristics of the fish were found. Exposure of adult male mosquitofish to 25, 50 and 100% treated sewage effluent for8-10 weeks in the laboratory yielded variable results in reproductive behaviour. Malescollected from an urban polluted river in 1999 and 2000 ... |
| نوع الوثيقة: | thesis |
| اللغة: | unknown |
| العلاقة: | http://researchrepository.napier.ac.uk/id/eprint/9467Test; https://napier-repository.worktribe.com/267521/1/Gray.pdfTest |
| الإتاحة: | https://napier-repository.worktribe.com/267521/1/Gray.pdfTest http://researchrepository.napier.ac.uk/id/eprint/9467Test |
| حقوق: | openAccess ; http://creativecommons.org/licenses/by-nc/4.0Test/ |
| رقم الانضمام: | edsbas.A869648A |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |