Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/5370
Title: Impact of microphallid trematodes on the survivorship, growth, and reproduction of an isopod (Cyathura carinata)
Authors: Ferreira, S. M. 
Jensen, K. T. 
Martins, P. A. 
Sousa, S. F. 
Marques, J. C. 
Pardal, M. A. 
Keywords: Fecundity; Microphallid; Mortality; Parasite
Issue Date: 2005
Citation: Journal of Experimental Marine Biology and Ecology. 318:2 (2005) 191-199
Abstract: Crustaceans are second intermediate hosts to several microphallid species (Trematoda). Some of these parasites are potentially pathogenic or manipulative. A laboratory experiment was performed to assess the impact of microphallids on the survival, growth and fecundity of Cyathura carinata, a protogynous hermaphroditic isopod, widespread within European estuaries. For nearly 12 weeks, experimental populations of infected and non-infected isopods were kept at 25 °C. C. carinata carrying microphallid cysts showed higher mortality rates than non-infected specimens and were not able to produce embryos. The reduced fecundity of infected isopods could be caused by parasite-induced castration and/or by mating failure due to behavioural modifications in one of the sexes. It might also be associated with lower growth rates and lower moulting frequencies, since infected C. carinata were significantly smaller than the non-infected after 9 weeks. This may imply a setback for the isopods to achieve sexual maturity (which may also affect the population sex ratio) and for females to lay their eggs in the marsupia. Regardless of the mechanisms involved, microphallids may have severe consequences for their host populations, through negative effects on survival, growth and fecundity. For species with direct development, such as C. carinata, parasite-induced reproduction failure may contribute to temporal fluctuations of abundance. Based on the present results, it is recommended to include parasites as an important factor influencing host populations from shallow-water ecosystems.
URI: http://hdl.handle.net/10316/5370
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat
filea855f4b12c6d4d909fef4e0b1331fd84.pdf166.91 kBAdobe PDFView/Open
Show full item record

Page view(s)

199
checked on Aug 6, 2020

Download(s)

100
checked on Aug 6, 2020

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.