Toxic effect of iron on green and brown hydra (Hydra viridissima I Hydra oligactis Pallas)

Matijević, Ana (2011) Toxic effect of iron on green and brown hydra (Hydra viridissima I Hydra oligactis Pallas). Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Iron is among the most common metals in Earth's crust. Hydra is a freshwater animal that belongs to the phylum Cnidaria. Toxic effect of iron on various organisms has been investigated before but this is the first documented research on its effect on hydras. Green hydra contains symbiotic algae in its gastrodermal myoepithelial cells. Individuals of symbiotic green hydra were treated with six concentrations of aqueous solution of iron dextran, while aposymbiotic brown hydra was treated with 14 concentrations of aqueous solution of iron dextran for three days. Morphological changes migration of individuals in experimental dish, changes of body shape, reaction to mechanical stimuli, tentacle reduction, mucous secretion and asexual reproduction were monitored with stereolupe. Migration of hydras was the first step in evading deleterious microenvironmental conditions, followed by changing its body shape. Histological changes were observed with light microscope. Morphometric analysis included measuring of endoderm and gastroderm surface areas and mesoglea thickness. Iron depositions in hydra tissue were observed as blue staining within cells. High concentrations of iron caused morphological and histological changes and mortality. Green hydra showed a higher level of resistance in surviving than brown hydra. Symbiosis was pointed out as an evolutionary advantage.

Item Type: Thesis (Diploma thesis)
Keywords: hydra, iron dextran, toxicity, symbiosis, migration, morphological and histological changes, morphometry
Supervisor: Kovačević, Goran
Date: 2011
Number of Pages: 35
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 09 Jun 2014 07:51
Last Modified: 09 Jun 2014 07:51
URI: http://digre.pmf.unizg.hr/id/eprint/2291

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