I= STUDIES ON THE SYSTEMATICS AND DICLOGY OF LARVAL TREMATODES INDECTING FRESHWATER SBALIS IN THE PUNJAB, PAKISTAN
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Title of Thesis
STUDIES ON THE SYSTEMATICS AND DICLOGY OF LARVAL TREMATODES INDECTING FRESHWATER SBALIS IN THE PUNJAB, PAKISTAN

Author(s)
Muhammad Haseeb Ashraf Siddiqui
Institute/University/Department Details
University Of The Punjab
Session
1980
Subject
Zoology
Number of Pages
510
Keywords (Extracted from title, table of contents and abstract of thesis)
larval trematodes, freshwater snails, monostome cercarice, xiphidiocercarise, echinostome cercariae, gymnocephalous cercariae, amphistome cercarae

Abstract
A survey of larval trematodes infecting freshwater snails in the Punjab, Pakistan was conducted. Various temporary and permanent water bodices were visited and approximately eighteen thousand five hundred snail specimens belonging to ten species of six generea were collected and examined for trematode infection. Bellamaya bengalensis was never found to harbour any trematode infection. A total number of four hundred and thirty one snail specimens, belonging to rest of the nine species, were found be infected and overall rate of infection was noted to be 2.33%.

As a result of the survey, fifty four species of cercariae were recovered. These included on monstome, three amphistome, eight gymnocephalous, four echinostome, thirteen xiphidiocercous and twenty five furcocercuous cercariae. Out of these, thirty six are new to science and ten are being reported for the first time from Pakistan. These cercariae are described, illustrated and their classification has been reviewed.

The nature of glandular secretions of five cercarae (one pleurolophocercous, one echinostome and three xiphidiocercus) was histochemically characterized employing established techniques. Mucosubstances were found to be predominantly present in penetration gland cells and cysto*enous gland cell. Mucoproteins and mucin were detected in mucoio gland cells (observed only in one of the xiphidiocercarae) in relatively large quantities. Proteins with elastin and collagen like staining properties were found to be mainly restricted to ventral and corsal gland cells. The structural details of various glandular structures and the probable functions of their secretions in the biology of the trematode have been discussed.

The effect of certain environmental variables i.e. pollutants (organ chlorinated and organophosphate insecticides and pH on the survival of snail and cercarise was studied. The organ chlorinated compounds were found to be more potent than organophosphate compounds both as mulluscicides and cercaricides. However, from amongst organophosphate compounds, phosphamidon was found to be relatively more toxic as mulluscicide than the organ chlorinated compounds, susceptibility of cercariae to the toxicity of insecticides also varied from compound to compound and insecticidal toxicity was found to be different for both the cercarial species with respect to a single compound. The ecological role of these factors in diminishing and delimiting snail populations has also been discussed.

Download Full Thesis
20181.58 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
293.83 KB
2 1 Introduction 1
1447.42 KB
3 2 Materials and methods 25
483.35 KB
4 3 Systematic account 34
11594.94 KB
  3.1 Monostome cercarice 35
  3.2 Amphistome cercarae 43
  3.3 Gymnocephalous cercariae 57
  3.4 Echinostome cercariae 110
  3.5 Xiphidiocercarise 138
  3.6 Furco cereous cercariae 221
5 4 List of freshwater cercariae previously recorded from Pakistan 348
36.48 KB
6 5 Host-parasites list of the cercariae encountered 349
180.67 KB
7 6 Histochemistry 353
511.36 KB
  6.1 Observations 354
  6.2 Discussion 390
8 7 Chemical control 398
6184.15 KB
  7.1 Observation 399
  7.2 Discussion 411
  7.3 References 416