Efeito de epibiontes para o sucesso reprodutivo em caranguejos estuarinos

• Autor(a) principal: Borges, Dalila Junqueira
• Data de Publicação: 2022
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/217199
• topic: Tidal Crab; Embryonic Development; Epibiosis; Bacteria; Caranguejo chama-maré; Desenvolvimento embrionário; Epibiose; Bactéria

The presence of epibionts, for example ciliates and bacteria, associated with brachyuran egg mass has great relevance in embryo viability. However, the role of these epibionts and/or the type of interaction between them and the embryos is still poorly understood for estuarine organisms. This work aimed to evaluate the effect of the presence of the ciliate Vorticellidae on the embryonic development of the crab Leptuca thayeri in the presence or absence of the bacterial community naturally found in the embryos. We used as response variable, the growth rate of hatching eggs, the hatching sucess and viability of zoea I larvae after 24h. To evaluate the effect of the presence of Vorticellidae ciliates and bacteria during the development of the tidal crab Leptuca thayeri we used four experimental treatments: embryos without Vorticellidae ciliated epibionts and without bacteria (A), ciliated epibionts embryos with bacteria (C), embryos with Vorticellidae ciliated epibionts and without bacteria (CA), and embryos without Vorticellidae ciliated epibionts and with bacteria (Control). The presence of ciliated Vorticellidae epibionts and/or bacteria did not affect the volumetric growth of the embryos or the larval survival after 24 hours of hatching of the zoea larvae of L. thayeri, however the time for hatching showed significant differences between the treatments, being longer in the treatment A and the short one in treatment C. Regarding the hatching rate of zoea I larvae, the Control treatment had the highest hatching rate while the CA treatment had the lowest rate. Our results indicate that the presence of ciliated epibionts in the egg mass negatively interferes with the embryonic development of L. thayeri and eggs with the presence of bacteria in their surface showed higher hatching success.