Impacts of extreme weather events on highly eutrophic marine ecosystem (Rogoznica Lake, Adriatic coast)

Ciglenečki, Irena; Janeković, Ivica; Marguš, Marija; Bura-Nakić, Elvira; Carić, Marina; Ljubešić, Zrinka; Batistić, Mirna; Hrustić, Enis; Dupčić, Iris; Garić, Rade

doi:10.1016/j.csr.2015.05.007

Cited by 28 publications

(22 citation statements)

References 63 publications

(105 reference statements)

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“…The marine lakes in Scandinavia were transformed into freshwater lakes due to isostasia, and hence some of them contain the trapped sea water at the bottom (Bøyum 1973). In comparison, the marine lakes of the eastern Adriatic coast are incorporated into the system of karst, containing sea water in the entire water column (Žic et al 2012, Hrustić et al 2013, Ciglenečki et al 2015. The Mljet Lakes (MLs) were formed during the Mesozoic Era as karstic depressions filled with fresh water (Govorčin et al 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Lakes behave like natural laboratories because of their comparatively prompt responses to environmental changes (Ciglenečki et al 2015). Those which contain sea water originated a few thousand years ago by processes related to late postglaciation, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The postglacial sea level rose around 4 to 5 thousand years ago and consequently the ingression of sea turned them into a marine environment (Bognar and Curić 1995). Unlike the well-oxygenated Jezero Mir (Lake Mir) (43.8864°N 15.1667°E), which is up to 10 m deep (Žic et al 2012), and the meromictic lake Zmajevo oko (Dragon's Eye) (43.5309°N 15.9588°E), which is up to 15 m deep, permanently hypoxic below 13 m and occasionally completely anoxic (Ciglenečki et al 2015), episodes of hypoxia are expected in deep waters of the MLs (Buljan and Špan 1976) within the system of coastal karst in Croatia.…”

Section: Introductionmentioning

confidence: 99%

“…There are large portions of marine systems that are hypoxic, such as subsurface waters of the East China Sea (Chen et al 2007, Wang et al 2016) and deep waters of the Baltic Sea (Conley et al 2009a, Rolff andElfwing 2015), the Black Sea (Konovalov et al 1999) and the Gulf of Mexico (Justić et al 1996(Justić et al , 2005. Layers of the open ocean can be hypoxic due to a significantly larger supply of organic matter than oxygen (Kamykowski and Zentara 1990), but it is hypoxia/anoxia in coastal seas (Diaz 2001) that causes greater concern regarding damage to the biodiversity of ecosystems (Ciglenečki et al 2015), which many human activities depend on, such as fisheries and tourism.…”

Section: Introductionmentioning

confidence: 99%

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Hypoxia in deep waters of moderately eutrophic marine lakes, Island of Mljet, eastern Adriatic Sea

Hrustić

Bobanović-Ćolić

2017

Sci. Mar.

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Summary:In this study, we explored the impact of eutrophication and stratification on hypoxia in deep waters of moderately warm Croatian marine lakes. Although the Mljet Lakes (MLs) are predominantly oligotrophic, mesotrophic conditions are present at depths below 20 m in the Small Lake (SL) and below 30 m in the Big Lake (BL), along with higher apparent oxygen utilization (AOU). Hypoxia at depths ≥25 m in SL and and ≥40 m in BL was observed between October 2009 and January 2010, and in SL in summer (July and September 2010). Significant differences (p<0.05) in several physical, biological and chemical parameters were detected between the lakes, while AOU, derived oxygen utilization rate (OUR) and organic carbon remineralization rate (OCRR) were not significantly different (p>0.05) between the lakes. An intense and persistent pycnocline throughout the year, comparatively high water temperature, extended water renewal time and summer phytoplankton bloom were identified as physical and biological parameters which might have significantly contributed to increased frequency of hypoxic events in a shallow SL. Significantly (p<0.05) higher ammonium concentration in SL, especially in its deep water, seems to be a long-term chemical feature related to the poor ventilation and higher sediment oxygen demand. At the current level of eutrophication and the present climate change trends, the MLs and similar systems may experience more persistent and intense stratification, which could further prevent mixing between upper and deep waters, likely leading to increasing duration of hypoxia and its negative impacts on the biodiversity of benthic communities.Keywords: hypoxia; eutrophication, marine lakes, coastal zone, Adriatic Sea, Mediterannean Sea. Hipoxia en aguas profundas de lagos marinos moderadamente eutróficos, isla de Mljet, mar Adriático orientalResumen: En este estudio, exploramos el impacto de la eutrofización y la estratificación sobre la hipoxia, en aguas profundas de los lagos marinos croatas moderadamente cálidos. Aunque los lagos Mljet (LsM) son predominantemente oligotróficos, las condiciones mesotróficas están presentes a profundidades inferiores a 20 m en el Lago Menor (LMe) y a 30 m en el Lago Mayor (LMa), junto con un mayor uso del oxígeno aparente (UOA). Fue observada hipoxia a profundidades ≥25 m en el LMe y ≥40 m en el LMa entre octubre de 2009 y enero de 2010, y en LMe en verano (julio y septiembre de 2010). Fueron detectadas diferencias significativas (p<0.05) en varios parámetros físicos, biológicos y químicos entre los lagos, mientras que el UOA, la tasa de utilización de oxígeno derivado y la tasa de remineralización de carbono orgánico no fueron significativamente diferentes (p>0.05) entre los lagos. La intensa y persistente picnoclina a lo largo del año, la temperatura comparativamente alta del agua, el tiempo prolongado de renovación del agua y la floración estival del fitoplancton se identificaron como parámetros físicos y biológicos que podrían haber contribuido significativamente incrementando...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hypoxia in deep waters of moderately eutrophic marine lakes, Island of Mljet, eastern Adriatic Sea

Hrustić

Bobanović-Ćolić

2017

Sci. Mar.

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“…They especially address descriptor 5, eutrophication (Ciglenecki et al, 2015;Cristina et al, 2015;and Pavlidou et al, 2015). Together the papers present an interesting gradient of eutrophication assessment from a sheltered bay (Rogoznica Lake in the Adriatic, Croatia (Ciglenecki et al, 2015), to coastal examples in the Eastern Mediterranean (Pavlidou et al, 2015) and moving to offshore locations in the Iberian Sea (Cristina et al, 2015). This represents a gradient from the Water Framework Directive transitional waters, to coastal waters and then offshore to the Marine Strategy Framework Directive.…”

mentioning

confidence: 99%