Abstract
Snails infected by trematodes may increase or decrease their reproductive activity in response to the presence of infection. Our aim was to verify the reproductive alterations in Subulina octona after infection by Paratanaisia bragai. The infected snails were individually exposed for 24 hours to 20 parasite eggs and four groups were formed (10, 20, 30 and 40 d.p.i.- days after infection), along with control groups. Every 10 days, the number of eggs in the reproductive tract, number of eggs hatched, galactogen content and histopathological changes were evaluated. The reproductive in the control and infected snails presented an alternating pattern, where periods of high production of eggs and newly hatched were followed by periods of low production. However, in relation to the amount of galactogen, both control and infected groups followed the same pattern of variation. In the histology, we observed the presence of male and female gametes with marked reduction in the number of oocytes. The results indicate that the intra-snail development of the parasite affects the reproductive biology of the host.
Highlights
Paratanaisia bragai (Santos, 1934) Freitas, 1959 is a digenetic trematode able to parasite snails of the Family Subulinidae Fischer and Crosse, 1877, who acquire the infection by ingesting eggs present in the excretion productsBraz
The experimental infection by P. bragai induced alterations in the reproductive biology, galactogen content and the tissue organization of the S. octona snails exposed to the parasite
Keller and Araújo (1992) reported that this digenetic trematode did not develop in experimentally infected S. octona
Summary
In Brazil, we found records of the occurrence of Paratanaisia spp. in Paraná (Taroda et al, 2013), Goiás (Carneiro et al, 1975), Rio de Janeiro (Menezes et al, 2001; Santos, 1934 apud Pinto el at., 2004, Xavier et al, 2015), São Paulo (Silva et al, 2016; Santi et al, 2017; Santi et al, 2018) and Minas Gerais (Tavela et al, 2014; Teodoro et al, 2018) Most of these records involved birds care at veterinary hospitals, zoos or wildlife triage and conservation centers. From the perspective of the One Health concept, where we must combine efforts from different areas to solve environmental, veterinary or human health problems, the study of P. bragai is even more important
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Schedule a callMore From: Brazilian journal of biology = Revista brasleira de biologia
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