Abrupt transitions of the top-down controlled Black Sea pelagic ecosystem during 1960-2000: Evidence for regime-shifts under strong fishery exploitation and nutrient enrichment modulated by climate-induced variations

Date

2007-02-01

Author

Oguz, Temel
Gilbert, Denis

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

203
views

0
downloads

Functioning of the Black Sea ecosystem has profoundly changed since the early 1970s under cumulative effects of excessive nutrient enrichment, strong cooling/warming, over-exploitation of pelagic fish stocks, and population outbreak of gelatinous carnivores. Applying a set of criteria to the long-term (1960-2000) ecological time-series data, the present study demonstrates that the Black Sea ecosystem was reorganised during this transition phase in different forms of top-down controlled food web structure through successive regime-shifts of distinct ecological properties. The Secchi disc depth, oxic-anoxic interface zone, dissolved oxygen and hydrogen sulphide concentrations also exhibit abrupt transition between their alternate regimes, and indicate tight coupling between the lower trophic food web structure and the biogeochemical pump in terms of regime-shift events.

Subject Keywords

Aquatic Science, Oceanography

URI

https://hdl.handle.net/11511/65964

Journal

DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS

DOI

https://doi.org/10.1016/j.dsr.2006.09.010

Collections

Graduate School of Marine Sciences, Article

Suggestions

OpenMETU
Core

Energy-based top-down and bottom-up relationships between fish community energy demand or production and phytoplankton across lakes at a continental scale Bartrons, Mireia; Mehner, Thomas; Argillier, Christine; Beklioğlu, Meryem; Blabolil, Petr; Hesthagen, Trygve; Sweden, Kerstin Holmgren; Jeppesen, Erik; Krause, Teet; Podgornik, Samo; Volta, Pietro; Winfield, Ian J.; Brucet, Sandra (Wiley, 2020-04-01) Fish community feeding and production rates may differ between lakes despite similar fish biomass levels because of differences in size structure and local temperature. Therefore, across-lake comparisons of the strength and direction of top-down and bottom-up fish-phytoplankton relationships should consider these factors. We used the metabolic theory of ecology to calculate size- and temperature-corrected community energy demand (CEDom) and community production (CP) of omnivorous fishes in 227 European lake...
Modelling phytoplankton succession on the Bering Sea shelf: role of climate influences and trophic interactions in generating Emiliania huxleyi blooms 1997-2000 Merico, A; Tyrrell, T; Lessard, EJ; Oguz, T; Stabeno, PJ; Zeeman, SI; Whitledge, TE (Elsevier BV, 2004-12-01) Several years of continuous physical and biological anomalies have been affecting the Bering Sea shelf ecosystem starting from 1997. Such anomalies reached their peak in a striking visual phenomenon: the first appearance in the area of bright waters caused by massive blooms of the coccolithophore Emiliania huxleyi (E huxleyi). This study is intended to provide an insight into the mechanisms of phytoplankton succession in the south-eastern part of the shelf during such years and addresses the causes of E. hu...
Parameterization of iron and manganese cycling in the Black Sea suboxic and anoxic environment Konovalov, S; Samodurov, A; Oguz, T; Ivanov, L (Elsevier BV, 2004-12-01) New and published data on the distribution and speciation of manganese and iron in seawater are analyzed to identify and parameterize major biogeochemical processes of their cycling within the suboxic (similar to15.6less than or equal tosigma(t)less than or equal tosimilar to16.2) and anoxic layers (sigma(t)less than or equal tosimilar to16.2) of the Black Sea. A steady-state transport-reaction model is applied to reveal layering and parameterize kinetics of redox and dissolution/precipitation processes. Pr...
Fish and mucus-dwelling bacteria interact to produce a kairomone that induces diel vertical migration in Daphnia Beklioğlu, Meryem; Gözen, Ayşe Gül (Wiley, 2006-12-01) 1. Bacterial populations associated with fish have previously been documented to be crucial for the production of chemical signals governing the interactions between predator fish and zooplankton prey.
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...

Citation Formats

T. Oguz and D. Gilbert, “Abrupt transitions of the top-down controlled Black Sea pelagic ecosystem during 1960-2000: Evidence for regime-shifts under strong fishery exploitation and nutrient enrichment modulated by climate-induced variations,” DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, pp. 220–242, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65964.