Naslov
Ecotoxicological effects of sodium metasilicate on green (Hydra viridissima Pallas, 1766) and brown (Hydra oligactis Pallas, 1766) hydra

Autori
Šimičev, A. ; Kovačević, G. ; Gračan, R.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
13th Multinational Congress on Microscopy: Book of Abstracts / Gajović, A. ; Weber, I. ; Kovačević, G. ; Čadež, V. ; Šegota, S. ; Peharec Štefanić, P. ; Vidoš, A. - Zagreb : Institut Ruđer Bošković, Hrvatsko mikroskopijsko društvo, 2017, 304-305

ISBN
978-953-7941-19-2

Skup
13th Multinational Congress on Microscopy

Mjesto i datum
Rovinj, Hrvatska, 24.09.2017. - 29.09.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
soluble silicates ; toxicology ; endosymbiosis ; freshwater ecosystems
(soluble silicates ; toxicology ; endosymbiosis ; freshwater ecosystem)

Sažetak
Hydra is a freshwater invertebrate from the phylum Cnidaria. Due to its widespread distribution, easy cultivation and morphological, behavioural and reproductive traits which are simple to measure, it represents a popular model organism in scientific research. Considering the fact that species of hydra differ in their morphology and physiology, it is possible they have different responses to stressors in the environment. Unlike all other species of hydra, green hydra harbours endosymbiotic algae in its gastrodermal myoepithelial cells. The aim of this research was to determine and compare the effects of sodium metasilicate on green and brown hydra. Sodium metasilicate belongs to the group of synthetic chemicals defined as soluble silicates and was chosen for the experiment because of its widespread use in many human activities such as production of detergents and soaps, cosmetic industry and production of paper. Hydras were treated with four concentrations of sodium metasilicate (0.05 g/L, 0.365 g/L, 0.38 g/L, 0.39 g/L). Morphological, behavioural and reproductive changes on hydras were observed during the following three days using a light microscope. For analysis of cyto-histological changes, standard preparations were made. The results showed that sublethal concentrations of sodium metasilicate caused migration, reduced reactivity to mechanical stimuli, changes in body contraction and damage of tentacles. The observed changes were more pronounced in brown hydra. Higher concentrations caused disintegration of cellular layers. In addition, sodium metasilicate caused changes in distribution of algae inside the body of green hydra. Green hydra showed better adaptability to unfavourable environmental conditions. Higher concentrations of sodium metasilicate could pose a direct influence on viability of populations of green and brown hydra in nature.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA