Inter-annual variability of a zooplankton community: the importance of summer concentrated rainfall in a regulated river ecosystem

2011 ◽  
Vol 34 (1) ◽  
pp. 49-58 ◽  
Author(s):  
Jong-Yun Choi ◽  
Kwang-Seuk Jeong ◽  
Geung-Hwan La ◽  
Hyun-Woo Kim ◽  
Kwang-Hyun Chang ◽  
...  
Keyword(s):  
Zooplankton Community ◽  
Regulated River ◽  
River Ecosystem ◽  
Annual Variability

Grazing by a river zooplankton community: Importance of microzooplankton

1996 ◽  
Vol 47 (8) ◽  
pp. 1025 ◽  
Author(s):  
T Kobayashi ◽  
P Gibbs ◽  
PI Dixon ◽  
RJ Shiel
Keyword(s):  
Surface Temperature ◽  
Phytoplankton Community ◽  
Size Fraction ◽  
Zooplankton Community ◽  
Zooplankton Biomass ◽  
Regulated River ◽  
Grazing Impact ◽  
Total Biomass ◽  
Community Grazing ◽  
The Impact

Grazing rates by a zooplankton community were measured in situ by a radiotracer cell method at depths of 1 m and 4 m at the upper tidal freshwater portion of a regulated river over a year. The objectives were to evaluate the likely grazing impact on the river phytoplankton community and to produce predictive models by regressing the measured grazing rates against zooplankton biomass, temperature and food concentrations (represented by chlorophyll a). Grazing attained rates (overall average 0.2 day-1, range 0.01-0.59 day-1, expressed as instantaneous mortality rates of algal cells) comparable to those reported for lentic zooplankton communities. The measured community grazing rates were predictable largely as a function of total biomass or rotifer biomass and surface temperature for 1 m depth, and as a function of total biomass or juvenile copepod biomass and surface temperature for 4 m depth, with all-positive regression coefficients in the models. Owing to the predominance of microzooplankton in the river, the impact of zooplankton community grazing appears likely to be linked to a small-size fraction of the phytoplankton community all year. Management strategies for river water quality may need to take account of possible functional demarcation of grazing by river zooplankton.

scholarly journals A critical analysis of regulated river ecosystem responses to managed environmental flows from reservoirs

2014 ◽  
Vol 60 (2) ◽  
pp. 410-425 ◽  
Author(s):  
Ben R. Gillespie ◽  
Simon Desmet ◽  
Paul Kay ◽  
Martin R. Tillotson ◽  
Lee E. Brown
Keyword(s):  
Critical Analysis ◽  
Environmental Flows ◽  
Regulated River ◽  
River Ecosystem ◽  
Ecosystem Responses

Annual variability and trophic relations of the mesozooplankton community in the eutrophicated coastal area (Vranjic Basin, eastern Adriatic Sea)

2006 ◽  
Vol 86 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Olja Vidjak ◽  
Natalia Bojanić ◽  
Grozdan Kušpilić ◽  
Ivona Marasović ◽  
Živana Ninčević Gladan ◽  
...  
Keyword(s):  
Zooplankton Community ◽  
Trophic Relationships ◽  
Trophic Relations ◽  
Small Copepod ◽  
Mesozooplankton Community ◽  
Annual Variability ◽  
Acartia Clausi ◽  
Protozoan Community ◽  
Key Species ◽  
One Year

Mesozooplankton was sampled during one year in the eutrophicated Vranjic Basin and the influence of environmental variables on its abundance and distribution was analysed. Parallel microzooplankton samples were collected in order to assess trophic relationships within the zooplankton community. Total mesozooplankton abundances were high, exceeding 2×104 ind m−3 in the warmer part of the year, but the biodiversity was low. The annual variability of this assemblage was mostly influenced by temperature. Copepods were dominant among net plankton groups, while ciliates dominated the protozoan community. The key species of the copepod community were Acartia clausi, Oithona nana and Euterpina acutifrons, occurring simultaneously throughout the year. High abundances of small copepod Oithona nana were determined in both meso- and microzooplankton samples, and comparisons of the catches from 125 μm net and 5-l Niskin bottles revealed no significant differences between them. Significant correlation determined between Acartia clausi and oligotrich ciliates indicates predator–prey relationship and the importance of the ciliate community in the energy transfer through the trophic web of this area.

Zooplankton community responses to regional-scale weather variability: a synoptic climatology approach

2015 ◽  
Vol 62 (3) ◽  
pp. 189-198 ◽  
Author(s):  
AL Primo ◽  
DG Kimmel ◽  
SC Marques ◽  
F Martinho ◽  
UM Azeiteiro ◽  
...  
Keyword(s):  
Regional Scale ◽  
Zooplankton Community ◽  
Synoptic Climatology ◽  
Community Responses ◽  
Weather Variability

Population Characteristics and Feeding of Roach Rutilus rutilus in Small Regulated River of the Kyiv Polissya

2020 ◽  
Vol 56 (1) ◽  
pp. 42-48
Author(s):  
Ye. A. Gupalo ◽  
I. I. Abramyuk ◽  
S. A. Afanasyev ◽  
O. V. Manturova ◽  
Ye. V. Savchenko
Keyword(s):  
Rutilus Rutilus ◽  
Population Characteristics ◽  
Regulated River ◽  
Roach Rutilus Rutilus
Sign in / Sign up

Export Citation Format

Share Document