Factors controlling the summer Emiliania huxleyi bloom in the Black Sea: A modeling study

Oguz, T
Merico, A
A one-dimensional coupled physical-ecosystem model identifies factors causing blooms of the coccolithophore Emilania huxleyi in the Black Sea, regularly observed during the early summer periods. The model specifically applies for a more idealized ecosystem of the interior basin, away from the coastal zone. It is represented in the form of four groups of phytoplankton (diatoms, dinoflagellates, E. huxleyi, a small phytoplankton group), and two groups of zooplankton further accompanied by simplified nitrogen and phosphorus cycles. The simulations show that the internal trophodynamic conditions in the Black Sea support E. huxleyi bloom development during May-July period as a part of the seasonal phytoplankton succession. They start flourishing after the diatom and dinoflagellate blooms under nitrogen depleted and moderate light conditions. They make use of regenerated nutrients available in the surface mixed layer and grow concomitantly with picophytoplankton community in the subsurface levels.


Diurnal gut pigment rhythm and metabolic rate of Calanus euxinus in the Black Sea
Besiktepe, S; Svetlichny, L; Yuneva, T; Romanova, Z; Shulman, G (Springer Science and Business Media LLC, 2005-04-01)
The vertical distribution, diel gut pigment content and oxygen consumption of Calanus euxinus were studied in April and September 1995 in the Black Sea. Gut pigment content of C. euxinus females was associated with diel vertical migration of the individuals, and it varied with depth and time. Highest gut pigment content was observed during the nighttime, when females were in the chlorophyll a (chl a) rich surface waters, but significant feeding also occurred in the deep layer. Gut pigment content throughout...
Distribution and abundance of ctenophores, and their zooplankton food in the Black Sea. I. Pleurobrachia pileus
Mutlu, E; Bingel, F (Springer Science and Business Media LLC, 1999-12-01)
The distribution of Pleurobrachia pileus Muller, 1776 in the Black Sea was determined using plankton samples collected above the anoxic zone (maximum of 200 m) in the winter, spring, and summer of 1991 to 1995; The summer samples were collected in 1991 to 1993 (for a previous) and are included in this paper for comparative purposes. High concentrations of P. pileus were found at the northern edges of anticyclonic eddies along the southern coastal regions. The biomass and abundance of P. pileus increased fro...
Satellite-detected early summer coccolithophore blooms and their interannual variability in the Black Sea
Cokacar, T; Oguz, T; Kubilay, N (Elsevier BV, 2004-08-01)
Interannual variability of the prevalent early summer coccolithophore blooms within surface waters of the Black Sea was studied by means of satellite-based bio-optical observations. Two coccolith detection algorithms, tested for the Black Sea conditions, were found to provide comparable spatial coccolith patterns consistent with the corresponding true color images. Reliability of the algorithms is also supported by several sets of time-series measurements in different parts of the basin. An analysis of 6 ye...
Effects of nutrient and water level changes on the composition and size structure of zooplankton communities in shallow lakes under different climatic conditions: a pan-European mesocosm experiment
Tavsanoglu, Ulku Nihan; Sorf, Michal; Stefanidis, Konstantinos; Brucet, Sandra; TÜRKAN, SEMRA; Agasild, Helen; Baho, Didier L.; Scharfenberger, Ulrike; Hejzlar, Josef; Papastergiadou, Eva; Adrian, Rita; Angeler, David G.; Zingel, Priit; Cakiroglu, Ayse Idil; Ozen, Arda; Drakare, Stina; Sondergaard, Martin; Jeppesen, Erik; Beklioğlu, Meryem (Springer Science and Business Media LLC, 2017-06-01)
Lentic ecosystems act as sentinels of climate change, and evidence exists that their sensitivity to warming varies along a latitudinal gradient. We assessed the effects of nutrient and water level variability on zooplankton community composition, taxonomic diversity and size structure in different climate zones by running a standardised controlled 6-months (May to November) experiment in six countries along a European north-south latitudinal temperature gradient. The mesocosms were established with two diff...
Spatial and temporal variability in the chemical properties of the oxic and suboxic layers of the Black Sea
Tuğrul, Süleyman; Murray, James W.; Friederich, Gernot E.; Salihoglu, Ilkay (Elsevier BV, 2014-07-01)
The Black Sea, a land-locked deep basin with sulfide bearing waters below 150-200 m, has been subject to anthropogenic pressures since the 1970s. Large inputs of nutrients (nitrate - N, phosphate - P, silicate - Si) with high N/P but low Si/N ratios and subsequent development of intensive eutrophication over the basin have changed vertical distributions and inventories of nutrients and redox-sensitive metals in the oxic, suboxic and anoxic layers. Chemical data sets obtained between 1988 and 2010, and older...
Citation Formats
T. Oguz and A. Merico, “Factors controlling the summer Emiliania huxleyi bloom in the Black Sea: A modeling study,” JOURNAL OF MARINE SYSTEMS, pp. 173–188, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65313.