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Reproductive effects of the endocirne disruptor fenarimol on a baltic amphipod Monoporeia affinis
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM). (Brita Sundelin)
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
2006 (English)In: Environmental Toxicology and Chemistry, ISSN 0730-7268, E-ISSN 1552-8618, Vol. 25, no 4, 1126-1131 p.Article in journal (Refereed) Published
Abstract [en]

An endocrine disruptor, the fungicide fenarimol, was investigated regarding its effects on reproduction and hormone (ecdysteroid) levels in the deposit-feeding amphipod Monoporeia affinis. In addition, the influence of food shortage, both by itself and in combination with fenarimol, on reproduction was examined. Field-collected amphipods were exposed in flow-through microcosms during the period of sexual maturation and mating in four treatment series: Control with low food, fenarimol with low food, control with high food, and fenarimol with high food. Fenarimol was added at a concentration of 0.3 mg/L in two pulses/week. Results show that fenarimol has a negative effect on fertilization rate and male mating ability. Results were supported by a tendency toward delayed male sexual development. Food shortage decreased weight in both sexes and retarded female oocyte development. Higher ecdysteroid levels were recorded in males than in females, and food shortage increased male ecdysteroid levels. No effect of fenarimol exposure on ecdysteroid levels was observed. No synergistic effects of fenarimol and food shortage could be distinguished in any variable examined. Thus, M. affinis was vulnerable to reproductive impairment by fenarimol, with effects on the next generation (i.e., a disturbed sexual development and fertilization ability). Food shortage has negative effects on M. affinis, but it does not enhance the effects of fenarimol.

Place, publisher, year, edition, pages
2006. Vol. 25, no 4, 1126-1131 p.
Keyword [en]
Monoporeia affinis, Fenarimol, Food availability, Ecdysteroids, Reproductive disorders
National Category
Biological Sciences
Research subject
Ecotoxicology
Identifiers
URN: urn:nbn:se:su:diva-38292DOI: 10.1897/04-610R1.1OAI: oai:DiVA.org:su-38292DiVA: diva2:309527
Available from: 2010-04-07 Created: 2010-04-07 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Assessing environmental and contaminant stressors in a benthic amphipod
Open this publication in new window or tab >>Assessing environmental and contaminant stressors in a benthic amphipod
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Organisms in the aquatic environment encounter numerous stressors throughout their lifespan. Some of them are biotic such as food availability, predators and parasites. Others are abiotic and include shifting salinity and temperature change among others. Stressors with anthropogenic origin (for example pollution) add to these challenges and can interfere with the organisms´ ability to adapt, survive and successfully reproduce. This thesis focuses on the benthic amphipod Monoporeia affinis and how it responds to environmental (food availability and increased temperature) and contaminant (fenarimol, PFOS and TBT) stressors. M. affinis is a key species in the soft bottoms of the Baltic Sea and inland lakes in Scandinavia. It is considered particularly sensitive to contaminant exposure, especially during the reproduction. The animals were exposed to both single and combined stressors in soft-bottom microcosms during sexual maturation and mating.  Adverse effects on survival and reproduction as well as parasite infection, hormonal status and protein damage were analyzed and evaluated for potential population effects and any synergisms between stressors. Results from these studies give support to M. affinis being a sensitive crustacean in terms of contaminant stress. Female sexual maturation is reliant on sufficient food availability and sexual maturation in both sexes is vulnerable to increased water temperatures affecting reproduction fitness. Increased water temperature also acts synergistically with contaminant stress in decreasing the amount of viable eggs and embryos. Ecologically realistic concentrations of perfluorooctane sulfonate (PFOS) and tributyltin (TBT) severely increase the number of parasite infected animals. These results indicate that the M. affinis populations in the field could be adversely affected by pollutant exposure. Effects that could be enhanced by the predicted increase in water temperature due to global warming.

Place, publisher, year, edition, pages
Stockholm: Department of Applied Environmental Science (ITM), Stockholm University, 2010. 50 p.
Keyword
Multiple stressors, Reproduction, Temperature, Food, Parasites, Fenarimol, PFOS, TBT, Endocrine disruption, Ecdysteroids, Microsporidia, Microcosm, Crustacea, Amhipoda, Monoporeia affinis
National Category
Biological Sciences
Research subject
Applied Environmental Science
Identifiers
urn:nbn:se:su:diva-38306 (URN)978-91-7447-042-0, pp1-50 (ISBN)
Public defence
2010-05-07, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript.Available from: 2010-04-15 Created: 2010-04-07 Last updated: 2010-04-08Bibliographically approved

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