Diurnal gut pigment rhythm and metabolic rate of Calanus euxinus in the Black Sea

Besiktepe, S
Svetlichny, L
Yuneva, T
Romanova, Z
Shulman, G
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 the water column varied from 0.8 to 22.0 ng pigment female(-1) in April and from 0.2 to 21 ng pigment female(-1) in September 1995. From the diel vertical migration pattern, it was estimated that female C. euxinus spend 7.5 h day(-1) in April and 10.5 h day(-1) in September in the chl a rich surface waters. Daily consumption by female C. euxinus in chl a rich surface waters was estimated by taking into account the feeding duration and gut pigment concentrations. Daily carbon rations of female C. euxinus, derived from herbivorous feeding in the euphotic zone, ranged from 6% to 11% of their body carbon weight in April and from 15% to 35% in September. Oxygen consumption rates of female and copepodite stage V ( CV) C. euxinus were measured at different temperatures and at different oxygen concentrations. Oxygen consumption rates at oxygen-saturated concentration ranged from an average of 0.67 mu g O-2 mg(-1) dry weight (DW) h(-1) at 5 degrees C to 2.1 mu g O-2 mg(-1) DW h(-1) at 23 degrees C for females, and ranged from 0.48 mu g O-2 mg(-1) DW h(-1) at 5 degrees C to 1.5 mu g O-2 mg(-1) DW h(-1) at 23 degrees C for CVs. The rate of oxygen consumption at 16 degrees C varied from 0.62 mu g O-2 mg(-1) DW h(-1) at 0.65 mg O-2 l(-1) to 1.57 mu g O-2 mg(-1) DW h(-1) at 4.35 mg O-2 l(-1) for CVs, and from 0.74 mu g O-2 mg(-1) DW h(-1) at 0.57 mg O-2 l(-1) to 2.24 mu g O-2 mg(-1) DW h(-1) at 4.37 mg O-2 l(-1) for females. From the oxygen consumption rates, daily requirements for the routine metabolism of females were estimated, and our results indicate that the herbivorous daily ration was sufficient to meet the routine metabolic requirements of female C. euxinus in April and September in the Black Sea.


Patterns of dark respiration in aquatic systems
Mantikci, Mustafa; Staehr, Peter A.; Hansen, Jorgen L. S.; Markager, Stiig (CSIRO Publishing, 2020-01-01)
We used continuous measurements of dissolved oxygen (DO) in dark bottles to characterise patterns of the dark respiration rate (R-dark) for three marine phytoplankton monocultures and in natural-water samples from two marine coastal systems. Furthermore, patterns of ecosystem community respiration rate were determined from open-water changes in DO in a fjord and in a lake. We considered two models of R-dark to describe temporal changes in DO: constant R-dark and decreasing R-dark; increasing R-dark. In addi...
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...
Particulate and dissolved primary production along a pronounced hydrographic and trophic gradient (Turkish Straits System-NE Aegean Sea)
Lagaria, A.; Psarra, S.; Gogou, A.; Tuğrul, Selen; Christaki, U. (Elsevier BV, 2013-06-01)
The rates of particulate (PPp) and dissolved primary production (PPd) were estimated along a trajectory of variable environmental regimes formed in a narrow shelf area, following the course of Black Sea water masses (BSW) passing through the Turkish Straits System (TSS) into the NE Aegean Sea (BS-AS outflow). Seven stations in total were sampled, covering a transect from the eastern edge of the Marmara Sea basin to the NE Aegean Sea, during two consecutive cruises performed in October 2008 within the framew...
Distribution and abundance of ctenophores and their zooplankton food in the Black Sea. II. Mnemiopsis leidyi
Mutlu, E (Springer Science and Business Media LLC, 1999-12-01)
The distribution of Mnemiopsis leidyi Agassiz, 1865 in the Black Sea was determined using plankton samples collected above the anoxic zone (maximum depth 200 m) in the summer, winter, and spring from 1991 to 1995. Distribution was patchy. Average biomasses of 15 to 500 g m(-2) were measured, and abundances varied from 10 to 180 ind m(-2). Biomass and abundance peaked in winter, and there was a secondary peak in the summer. The distribution of M. leidyi was correlated with hydrographic features in the Black ...
Factors controlling the summer Emiliania huxleyi bloom in the Black Sea: A modeling study
Oguz, T; Merico, A (Elsevier BV, 2006-02-01)
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 ...
Citation Formats
S. Besiktepe, L. Svetlichny, T. Yuneva, Z. Romanova, and G. Shulman, “Diurnal gut pigment rhythm and metabolic rate of Calanus euxinus in the Black Sea,” MARINE BIOLOGY, pp. 1189–1198, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68035.