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Impacts of temperature anomalies on mortality of benthic organisms in the Adriatic Sea
Kruzic, P.; Rodic, P.; Popijac, A.; Sertic, M. (2016). Impacts of temperature anomalies on mortality of benthic organisms in the Adriatic Sea. Mar. Ecol. (Berl.) 37(6): 1190-1209. https://dx.doi.org/10.1111/maec.12293
In: Marine Ecology (Berlin). Blackwell: Berlin. ISSN 0173-9565; e-ISSN 1439-0485
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| Trefwoord |
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| Author keywords |
Adriatic Sea; climate change; marine biodiversity; mortality impact; sea temperature anomalies |
| Auteurs | | Top |
- Kruzic, P.
- Rodic, P.
- Popijac, A.
- Sertic, M.
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| Abstract |
Recurrent climate‐induced mass mortality episodes have been recorded in the Mediterranean Sea over the past 15 years, affecting rocky benthic communities. In this study, we provide for the first time a report on the annual mortality events of benthic sessile invertebrates occurring in the eastern part of the Adriatic Sea. Over the course of 14 consecutive years, we studied the sea temperature gradient to a depth of 40 m and found an abnormal summer warming trend and an increased frequency of above‐average temperatures. Mortality events were recorded in the summers of 10 observed years, in particular in 2009, when the highest mortality rates were recorded. Late in summer 2009, extensive mass mortality of sessile invertebrates was observed in the entire Eastern Adriatic Sea. We performed an analysis of selected target benthic species associated with mass mortality events with inter‐regional differences in hydrological and temperature conditions. We were able to characterize the mortality event by studying five areas covering the northern, central and southern regions of the Eastern Adriatic Sea. The degree of impact on each study area was quantified at 28 sites by estimating the proportion of affected target species. According to the obtained data, the northern sites (Cres area) were the least affected, whereas sites in the Central and Southern Adriatic [Telašćica and Lastovo Nature Parks, Mljet National Park (NP )] displayed the highest impact. In summer 2009, sea surface temperatures reached values of 28 °C in the Cres area and 30 °C in Mljet NP . These thermal conditions were concomitant with moderate to severe mass mortalities of benthic populations. Mass mortality events reached depths of 45 m in most parts of the affected areas. Amongst studied species, the scleractinian coral and gorgonian populations suffered the most extensive damage during the mass mortality events. |
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