Naslov
Cellular energy allocation in mussels (Mytilus galloprovincialis) from the stratified estuary as a physiological biomarker

Autori
Erk, Marijana

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

Izvornik
14th International Symposium on Toxicity Assessment - Program and abstract book / Vasseur, Paule - Metz, 2009, 40-40

Skup
14th International Symposium on Toxicity Assessment (ISTA 14)

Mjesto i datum
Metz, Francuska, 30.08.2009. - 04.09.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
cellular energy allocation; natural stress; salt-wedge estuary; mussels

Sažetak
Beside the stress posed by toxic substances, the natural stress caused by abiotic factors affects the organisms, especially those inhabiting a highly variable environment such as an estuary. The cellular energy allocation (CEA) methodology was applied as a physiological biomarker in mussels to assess the effects of natural stress posed by strong fluctuations in salinity and temperature occurring in stratified estuary. The study was performed in a salt-wedge type of estuary (Krka River, Adriatic coast, Croatia), which is regarded as fairly unpolluted. Four sampling sites were selected based on their differences in the salinity and temperature. The CEA value was calculated as a ratio between available energy (sum of total sugars, proteins and lipids) and energy consumption (based on the activity of mitochondrial electron transport system). Hepatopancreas was selected as a target organ. Higher values of available energy were recorded in June than in November, which were especially evident in the storage components (carbohydrates and lipids), while the constitutive component (proteins) remained relatively constant. The available energy was less influenced by the inter-site differences in salinity than the energy consumption. The highest energy consumption was recorded at estuarine site, which may be caused by the energetically costly maintenance of osmotic balance. Consequently, a clear difference was observed between the coastal (CEA values in the range from 293 to 477) and estuarine mussels (CEA values in the range from 214 to 263). Decrease in CEA can be an outcome of either a reduction in available energy or higher energy consumption. It will ultimately result in a lower amount of energy available for growth, reproduction, or defence against pollution and illustrates how vulnerable are estuarine ecosystems.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Biologija

POVEZANOST RADA