Phytoplankton response to climatic and anthropogenic influences in the north-eastern Adriatic during the last four decades

Marić, D; Kraus, Romina; Godrijan, Jelena; Supić, Nastjenjka; Djakovac, Tamara; Robert, Paul

doi:10.1016/j.ecss.2012.02.003

Cited by 92 publications

(77 citation statements)

References 34 publications

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“…However, shifts in phytoplankton composition appear likely and are becoming apparent: Coccolithophores appear to have expanded their geographic range (Merico et al 2003, Cubillos et al 2007) and a shift towards Prochlorococcus and Trichodesmium due to increased stratification has become visible in the North Atlantic (Lomas et al 2010) and Pacific Subtropical Gyre . A regime shift in phytoplankton abundance, composition and seasonal cycle due to changed river discharge has been documented in the Adriatic (Mari et al 2012). …”

Section: Role Of Phytoplanktonmentioning

confidence: 99%

The biological pump in a high CO<sub>2 world

Passow¹,

Carlson²

2012

Mar. Ecol. Prog. Ser.

326

267

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The vertical separation of organic matter formation from respiration can lead to net carbon sequestration within the ocean's interior, making the biological pump an important component of the global carbon cycle. Understanding the response of the biological pump to the changing environment is a prerequisite to predicting future atmospheric carbon dioxide concentrations. Will the biological pump weaken or strengthen? Currently the ocean science community is unable to confidently answer this question. Carbon flux at approximately 1000 m depth, the sequestration flux, determines the removal of carbon from the atmosphere on time scales ≥100 yr. The sequestration flux depends upon: (1) input rates of nutrients allochthonous to the ocean, (2) the export flux at the base of the euphotic zone, (3) the deviation of carbon fixation and remineralization from Redfield stoichiometry, and (4) the flux attenuation in the upper 1000 m. The biological response to increasing temperature, ocean stratification, nutrient availability and ocean acidification is frequently taxa-and ecosystem-specific and the results of synergistic effects are challenging to predict. Consequently, the use of global averages and steady state assumptions (e.g. Redfield stoichiometry, mesopelagic nutrient inventory) for predictive models is often insufficient. Our ability to predict sequestration flux additionally suffers from a lack of understanding of mesopelagic food web functioning and flux attenuation. However, regional specific investigations show great promise, suggesting that in the near future predictions of changes to the biological pump will have to be regionally and ecosystem specific, with the ultimate goal of integrating to global scales.

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Section: Role Of Phytoplanktonmentioning

confidence: 99%

The biological pump in a high CO<sub>2 world

Passow¹,

Carlson²

2012

Mar. Ecol. Prog. Ser.

326

267

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“…The maxima of species abundances in the lake are in the same order of magnitude as maxima of species abundances in other coastal regions of the eastern Adriatic Sea (CETINIĆ et al 2006, BUŽANČIĆ et al 2012, MARIĆ et al 2012, VIDJAK et al 2012, GODRIJAN et al 2013). The extreme environmental conditions (high seasonal variations in salinity and temperature; redox conditions and nutrients; periodically high RSS concentration in the whole water column) that characterize Rogoznica Lake govern the development of the above mentioned species that exist in the lake , KRŠINIĆ et al 2013.…”

Section: Discussionmentioning

confidence: 59%

Diatoms in an extreme euxinic environment (Rogoznica Lake, eastern Adriatic coast)

Malešević¹,

Ciglenečki²,

Bura-Nakić³

et al. 2015

Acta Botanica Croatica

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-The Rogoznica Lake marine system is a small, karstic, naturally eutrophic and euxinic marine environment. Abundance and temporal distribution of phytoplankton was investigated in relation to environmental conditions in the period from 1998 to 2013. The 36 determined diatoms contributed 90% of the total phytoplankton abundance. The diatom composition is characterized by low species diversity and high single species abundance (up to 10 7 cells L -1). There were, on average, 2.6 diatom species per sample (maximum 14 diatom species per sample) refl ecting extreme environmental conditions. Dominant diatoms Thalassionema nitzschioides, Cyclotella choctawhatcheeana, Dactyliosolen fragilissimus and Chaetoceros curvisetus occurred repeatedly and were alternately dominant in the lake during the whole research period. Some diatoms were dominant only in limited period, like Cyclotella choctawhatcheeana (evident since 2001), and Pseudo-nitzschia spp. (evident in the period 2002 to 2009). It appears that the interplay of environmental conditions such as variability in thermohaline and redox conditions, nutrient and reduced sulphur concentration infl uence the phytoplankton development and abundance in the lake.

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“…The group P. pseudodelicatissima »sensu lato« is positively correlated with temperature in the northern Adriatic, as was the case in the western Mediterranean, where higher abundances were recorded in the warmer part of the year, for example, in the late summer and autumn (LJUBEŠIĆ et al 2011, MARIĆ et al 2012.…”

Section: Discussionmentioning

confidence: 81%

Colonization of diatoms and bacteria on artificial substrates in the northeastern coastal Adriatic Sea

Mejdandžić¹,

Ivanković²,

Pfannkuchen³

et al. 2015

Acta Botanica Croatica

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-Every surface that is immersed in seawater becomes rapidly covered with an unavoidable biofi lm. Such biofi lm formation, also known as fouling, is a complex multistage process and not yet thoroughly investigated. In this study, the succession of diatoms and bacteria was investigated during a one month exposure on an artifi cial substrate of plexiglass (polymer of methyl methacrylate) mounted above the seafl oor at a depth of 5 m. For biofi lm analyses, the fouling was investigated using selective agar plates, epifl uorescence, light and electronic microscopy, as well as high performance liquid chromatography (HPLC) pigment analysis. During biofi lm development, the abundance of all biofi lm components increased and reached maximum values after a one month exposure. In the bacterial community, heterotrophic marine bacteria were dominant and reached 1.96 ± 0.79 × 10 4 colony forming units (CFU) cm -2. Despite the fact that faecal coliforms and intestinal enterococci were detected in the water column, faecal coliforms were not detected in the biofi lm and intestinal enterococci appeared after one month of exposure but in the negligible number of 60 ± 10 CFU cm . The diatom community was dominated by Cylindrotheca closterium and other pennate benthic diatoms. A detailed taxonomic analysis by electronic microscopy revealed 30 different taxa of diatoms. The study confi rmed that a plexiglass surface in a marine environment is susceptible to biofouling within 30 days of contact. Furthermore, the co lonization process sequence fi rstly involved bacteria and cyanobacteria, and secondly diatoms, which together formed a primary biofi lm in the sea.

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Phytoplankton response to climatic and anthropogenic influences in the north-eastern Adriatic during the last four decades

Cited by 92 publications

References 34 publications

The biological pump in a high CO<sub>2 world

The biological pump in a high CO<sub>2 world

Diatoms in an extreme euxinic environment (Rogoznica Lake, eastern Adriatic coast)

Colonization of diatoms and bacteria on artificial substrates in the northeastern coastal Adriatic Sea

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