Phytoplankton growth rate and zooplankton grazing in the western part of the Black Sea in the autumn period

Oceanology ◽  
2009 ◽  
Vol 49 (1) ◽  
pp. 83-92 ◽  
Author(s):  
L. V. Stel’makh ◽  
I. I. Babich ◽  
S. Tugrul ◽  
S. Moncheva ◽  
K. Stefanova
Keyword(s):  
Growth Rate ◽  
Black Sea ◽  
Phytoplankton Growth ◽  
The Black Sea ◽  
Zooplankton Grazing ◽  
Autumn Period ◽  
Phytoplankton Growth Rate

The influence of temperature on seasonal and inter-annual variability of some structural and functional characteristics of the phytoplankton in coastal waters of the Black Sea (Sevastopol region)

2019 ◽  
pp. 46-56
Author(s):  
Lyudmyla V. Stelmakh
Keyword(s):  
Growth Rate ◽  
Black Sea ◽  
Coastal Waters ◽  
Specific Growth ◽  
Seasonal Succession ◽  
The Black Sea ◽  
Species Structure ◽  
Annual Variability ◽  
Influence Of Temperature On ◽  
Phytoplankton Growth Rate

The seasonal and inter-annual variability of the phytoplankton growth rate and biomass in the coastal waters of the Black Sea near Sevastopol was studied. The nature of the seasonal dynamics and the amplitude of these parameters almost coincide. An increase in the average annual values of water temperature causes changes in the species structure of phytoplankton, its seasonal succession, and a decrease in the average annual values of the specific growth rate and phytoplankton biomass by about 2 times.

A modeling approach to simulate impact of climate change in lake water quality: phytoplankton growth rate assessment

1998 ◽  
Vol 37 (2) ◽  
pp. 177-185 ◽  
Author(s):  
Hany Hassan ◽  
Keisuke Hanaki ◽  
Tomonori Matsuo
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Growth Rate ◽  
Dissolved Oxygen ◽  
Lake Water ◽  
Phytoplankton Growth ◽  
Quality Data ◽  
Model Parameters ◽  
Lake Water Quality ◽  
Phytoplankton Growth Rate

Global climate change induced by increased concentrations of greenhouse gases (especially CO2) is expected to include changes in precipitation, wind speed, incoming solar radiation, and air temperature. These major climate variables directly influence water quality in lakes by altering changes in flow and water temperature balance. High concentration of nutrient enrichment and expected variability of climate can lead to periodic phytoplankton blooms and an alteration of the neutral trophic balance. As a result, dissolved oxygen levels, with low concentrations, can fluctuate widely and algal productivity may reach critical levels. In this work, we will present: 1) recent results of GCMs climate scenarios downscaling project that was held at the University of Derby, UK.; 2) current/future comparative results of a new mathematical lake eutrophication model (LEM) in which output of phytoplankton growth rate and dissolved oxygen will be presented for Suwa lake in Japan as a case study. The model parameters were calibrated for the period of 1973–1983 and validated for the period of 1983–1993. Meterologic, hydrologic, and lake water quality data of 1990 were selected for the assessment analysis. Statistical relationships between seven daily meteorological time series and three airflow indices were used as a means for downscaling daily outputs of Hadley Centre Climate Model (HadCM2SUL) to the station sub-grid scale.

Long-term changes in nutrient supply of phytoplankton growth in the Black Sea

2013 ◽  
Vol 117-118 ◽  
pp. 53-64 ◽  
Author(s):  
Alexander S. Mikaelyan ◽  
Andrey G. Zatsepin ◽  
Valeriy K. Chasovnikov
Keyword(s):  
Black Sea ◽  
Nutrient Supply ◽  
Phytoplankton Growth ◽  
The Black Sea ◽  
Long Term Changes

scholarly journals ZOOPLANKTON OF THE NORTH-EASTERN PART OF THE BLACK SEA OFF THE COAST OF TAMAN IN THE SUMMER-AUTUMN PERIOD 2018–2019

2021 ◽  
Vol 49 (1) ◽  
pp. 26-36
Author(s):  
N.P. Remizova
Keyword(s):  
Black Sea ◽  
Taxonomic Composition ◽  
The Black Sea ◽  
Mnemiopsis Leidyi ◽  
Autumn Period ◽  
The North ◽  
Oithona Davisae ◽  
Invading Species ◽  
North Eastern ◽  
North Eastern Part

The taxonomic composition and quantitative characteristics of zooplankton in the northeastern part of the Black Sea near the Taman coast in the summer-autumn period of 2018–2019 were studied. Zooplankton was represented mainly by eurythermic and thermophilic forms. All the discovered species and taxa are currently typical of the Black Sea, including the invading species: copepods Acartia tonsa, Oithona davisae, and combtails Mnemiopsis leidyi, Beroe ovata. The average number of zooplankton in 2018 ranged from 2.7–15.9 thousand copies/m3, the biomass – 0.02–0.14 g/m3; its indicators in 2019; they were lower, respectively, 2.0–5.6 thousand copies/m3 and 0.02–0.07 g/m3. These indicators were within the values recorded earlier, in 2013–2014. A significant part of the coastal zooplankton is meroplankton, which accounted for 5–69% of the population and 4–47% its biomass. O. davisae dominated amoung copepods. This speciest was leading in numbers in both years except June 2019. Despite the similarity of the taxonomic composition of zooplankton, the dominant species in terms of biomass differed by month in two years.

An early spring bloom of large diatoms in the ice-covered Saroma-ko Lagoon, Hokkaido, Japan

2011 ◽  
Vol 92 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Akihiro Shiomoto ◽  
Koji Asakuma ◽  
Han-Dong Hoon ◽  
Koichi Sakaguchi ◽  
Kimihiko Maekawa
Keyword(s):  
Growth Rate ◽  
Global Warming ◽  
Primary Production ◽  
Spring Bloom ◽  
Early Spring ◽  
Phytoplankton Growth ◽  
Bloom Period ◽  
Ice Coverage ◽  
Phytoplankton Growth Rate ◽  
Free Area

Saroma-ko Lagoon, the largest body of water that has complete ice coverage during winter in Japan, was not completely covered by ice in the winter of 2009. This condition is considered to be a result of the progression of global warming. A bloom of large diatoms was observed in the ice-free area between February and April. This early spring bloom seemed to have started in the latter part of January, and lasted for about three months. The maximum chlorophyll-a (Chl a) concentration of about 10 mg m−3 was observed in March, and was similar to the level of 5–20 mg m−3 previously reported for the ordinary spring bloom in Saroma-ko Lagoon. The maximum primary production of 786 mgC m−2 day−1 and the maximum Chl a-specific primary production, an index of the phytoplankton growth rate, were also found in March. Species changes from Thalassiosira spp. to Chaetoceros spp. were observed during the bloom. This early spring bloom could extend into the ordinary spring bloom period. Its duration was obviously longer than that of the spring bloom, which is typically about one month. These results show the phytoplankton condition that could be expected during winter and spring as global warming progresses.

Dominance of phosphorus over nitrogen as the limiter to phytoplankton growth rate

Hydrobiologia ◽  
1978 ◽  
Vol 57 (3) ◽  
pp. 209-215 ◽  
Author(s):  
E. B. Welch ◽  
P. Sturtevant ◽  
M. A. Perkins
Keyword(s):  
Growth Rate ◽  
Phytoplankton Growth ◽  
Phytoplankton Growth Rate

Multivariate control of heterotrophic bacterial abundance and zooplankton grazing in Labrador fjords (northeastern Canada)

2020 ◽  
Vol 84 ◽  
pp. 105-120
Author(s):  
AG Simo-Matchim ◽  
M Gosselin ◽  
C Belzile
Keyword(s):  
Growth Rate ◽  
Heterotrophic Bacteria ◽  
Abiotic Factors ◽  
Mean Value ◽  
Phytoplankton Growth ◽  
Heterotrophic Nanoflagellates ◽  
Organic Substrates ◽  
Bacterial Growth Rate ◽  
Phytoplankton Growth Rate ◽  
Substantial Control

This study was conducted in 4 Labrador fjords (Nachvak, Saglek, Okak, and Anaktalak) during the summers of 2007 and 2013, early fall 2010, and late fall 2009. Our results show that water temperature combined with the availability of nutrients and organic substrates are the main abiotic factors controlling the abundance of heterotrophic bacteria in Labrador fjords. Bacterivory also played a crucial role, with heterotrophic bacteria exerting a significant bottom-up control on the abundance of heterotrophic nanoflagellates (r = 0.35, p < 0.05) and ciliates (r = 0.70, p < 0.01). During summer 2013, the intrinsic phytoplankton growth rate varied between <0 and 0.64 d-1, with a mean value of 0.36 d-1. The herbivory rate was highly variable, ranging from 0.01 to 0.86 d-1, with a mean value of 0.31 d-1. Grazing mortality was 6-fold higher than phytoplankton growth rate. Mean phytoplankton growth and herbivory rates in Labrador fjords were comparable to the Barents and Bering seas. The intrinsic growth rate of total heterotrophic bacteria ranged between <0 and 0.68 d-1, with a mean value of 0.30 d-1. Bacterivory varied from 0.01 to 0.95 d-1, with a mean of 0.30 d-1. Mortality due to grazing was up to 2.3 times higher than total bacterial growth rate. This study improves our understanding of the factors influencing the dynamics of heterotrophic bacteria and indicates that herbivory and bacterivory exert substantial control on microbial communities in Labrador fjords.

Sign in / Sign up

Export Citation Format

Share Document