Tegumental surface alterations of fasciola gigantica (Cobbold, 1885) due to in vitro lead exposure using scanning electron microscopy
Date of Publication
2014
Document Type
Master's Thesis
Degree Name
Master of Science in Biology
College
College of Science
Department/Unit
Biology
Thesis Adviser
Mary Jane C. Flores
Defense Panel Chair
Florencia G. Claveria
Defense Panel Member
Divina M. Amalin
Gil A. Cauyan
Abstract/Summary
This study aimed to examine using scanning electron microscope (SEM) the in vitro effects of different lead concentrations in the tegument and observed motility of F. gigantica (giant liver fluke) isolated from livers of carabaos. Percentage relative motility (RM) of flukes after 15 hours lead exposure revealed 100%, 75%, 61% and 30% at 0, 100, 150 and 200ppm respectively. Using these RM values, the lethal concentration (LC50) of lead was 160ppm together with manifestations of physiological stress such as curling and excretion of black exudates. Three types of curling observed were curling of the lateral body margins, at one end of the body and at both ends of the body. SEM studies of the tegument were conducted using the calculated LC50 values (160ppm) including 110ppm and 210ppm as lower concentration and higher concentration, respectively. Results showed that lead exposure of the flukes caused surface alterations in all treatments with different degrees. At 110ppm, sloughing, blebbing, furrowing and folding were observed after 7 and 15 hours post-incubation to lead. However, at higher concentrations (160ppm and 210ppm) wrinkling and crumpling of the tegumental surface were evident. At 7 hours lead exposure, wrinkling was observed and this intensified as crumpling at 15 hours post exposure. In conclusion, liver flukes has a lead tolerance as low as 100ppm and as high as 210ppm which suggests its potential as a possible bioindicator of environmental pollution and promotes its use as a good candidate of an effect indicator based on the distinct surface morphological variations observed in lead-exposed liver flukes.
Abstract Format
html
Language
English
Format
Electronic
Accession Number
CDTG005768
Shelf Location
Archives, The Learning Commons, 12F Henry Sy Sr. Hall
Physical Description
1 computer optical disc ; 4 3/4 in.
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Recommended Citation
Chang, A. G. (2014). Tegumental surface alterations of fasciola gigantica (Cobbold, 1885) due to in vitro lead exposure using scanning electron microscopy. Retrieved from https://animorepository.dlsu.edu.ph/etd_masteral/4742