Naslov
Application of acanthocephalans as bioindicators of metal exposure in the karst Krka River influenced by industrial and municipal wastewaters

Autori
Filipović Marijić, Vlatka ; Mijošek, Tatjana ; Dragun, Zrinka ; Krasnići, Nesrete ; Ivanković, Dušica ; Erk, Marijana

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

Izvornik
9th Acanthocephalan Workshop :Book of Abstracts / - , 2018, 13-13

Skup
9th Acanthocephalan Workshop

Mjesto i datum
Stará Lesná, Slovačka, 09.09.2018. - 13.09.2018

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
parasites ; metals ; biomonitoring ; bioindicatorsacanthocephalans ; bioindicators ; wastewaters ; metal exposure
(acanthocephalans ; bioindicators ; wastewaters ; metal exposure)

Sažetak
Naturally present trace metal concentrations in rivers are low, even extremely low in karst rivers, which make them very sensitive to anthropogenic influence. Krka River is a typical karst river in the Republic of Croatia whose lower part was proclaimed National Park due to its exceptional natural beauty. The aim of the present study was to evaluate metal exposure in the Krka River few kilometres upstream of the park border, in the area threatened by industrial and municipal wastewaters, by application of bioindicator organisms: fish brown trout (Salmo trutta Linnaeus, 1758), gammarids (Gammarus fossarum Koch, 1836) and fish intestinal parasites, acanthocephalans (Dentitruncus truttae Sinzar, 1955). During the last few decades, acanthocephalans were recognized as potential indicators of metal exposure in the aquatic environment due to their effective metal accumulation, which is order of magnitude higher compared to commonly used bioindicator organisms (Sures et al., 2017). Concentrations of 16 microelements and 4 macroelements were measured in digested fish intestine, gammarids and acanthocephalans from the Krka River source as a reference site and downstream of the wastewater impact. Prior to metal measurement by high resolution inductively coupled plasma-mass spectrometer (HR ICP-MS), samples were acid digested in a drying oven at 85°C for 3.5 hours using concentrated HNO3 and H2O2. Acanthocephalan prevalence in fish from the reference site was 100% and from the pollution impacted area 80%, while the mean intensity of infection per fish was around 34 at both locations. More effective accumulation of most metals was found in acanthocephalans compared to fish and gammarids at both locations, especially of toxic Cd, Pb, Sr and Tl, which average levels were 4-39 times higher in acanthocephalans. Metal concentrations were mostly higher in organisms from the wastewater impacted area, confirming anthropogenic influence and useful contribution of acanthocephalans as sensitive bioindicators of bioavailable metal levels.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Interdisciplinarne prirodne znanosti

POVEZANOST RADA