Histological Responses of Golden Apple Snail (Pomacea canaliculata) to Copper
Silvia C. Peña1,*, Glorina N. Pocsidio2, and Elisa L. Co3
1,*Institute of Environmental Science and Meteorology,
University of the Philippines Diliman, Diliman, Quezon City, Philippines
2Institute of Biology, University of the Philippines Diliman, Diliman, Quezon City, Philippines
3Department of Biology, College of Arts and Sciences,
University of the Philippines Manila, Manila, Philippines
*Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
ABSCTRACT
Histopathological changes in kidney, digestive gland, foot, and gills of Pomacea canaliculata due to copper exposure were studied to assess copper’s effects on tissues of its different organs and also for the possibility of being used as a biomarker. Three-month-old snails were exposed to copper (67.5µg L-1) for seven days and were excised and fixed in 10% formalin. Routine histological preparation and examination exhibited varied forms and degrees of aberrations. These include hydropic degeneration, disintegration and loss of cells, elongation of kidney tubules, hyperplasia of K corpuscles in the digestive gland, flattened epithelium and muscular bundles in foot in complete disarray, dilations and folding of the gill filaments. Gross and subtle tissue alterations in these organs may lend support to the role of P. canaliculata as a biomarker for copper contamination.
INTRODUCTION
Golden apple snail (Pomacea canaliculata) is a common freshwater snail and a notorious agricultural pest in the Philippines and other countries in Asia (Mochida 1988, 1991; Naylor 1996). Concerted efforts have been undertaken to annihilate them but they still persist and even spread naturally and intensively. Since this snail is ecologically important, persistent and possesses attributes of a biomonitor – (a) they are big enough to provide sufficient material (soft tissue) for analyses, (b) easy to handle, collect, and culture, (c) live long, (d) abundant, (e) sedentary, (f) can survive for a long time without food, and (g) can be found in almost any freshwater ecosystem in many countries– this needs an extensive study for ecological management and its potential as a metal biomonitor . . . . . read more
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