Zooplankton Community Response to the Ageing of Iskar Reservoir (Bulgaria)

2020 ◽  
Author(s):  
Milena Stefanova ◽  
Dimitar Kozuharov ◽  
Marieta Stanchkova ◽  
Stoitze Andreev ◽  
Galerida Rajkova-Petrova
Keyword(s):  
Zooplankton Community ◽  
Community Response

scholarly journals Zooplankton Community Response to Seasonal Hypoxia: A Test of Three Hypotheses

Diversity ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 21 ◽  
Author(s):  
Julie E. Keister ◽  
Amanda K. Winans ◽  
BethElLee Herrmann
Keyword(s):  
Community Structure ◽  
Puget Sound ◽  
Temporal Stability ◽  
Zooplankton Community ◽  
Community Response ◽  
Crustacean Zooplankton ◽  
Zooplankton Abundance ◽  
Calanoid Copepods ◽  
Low Oxygen ◽  
Seasonal Hypoxia

Several hypotheses of how zooplankton communities respond to coastal hypoxia have been put forward in the literature over the past few decades. We explored three of those that are focused on how zooplankton composition or biomass is affected by seasonal hypoxia using data collected over two summers in Hood Canal, a seasonally-hypoxic sub-basin of Puget Sound, Washington. We conducted hydrographic profiles and zooplankton net tows at four stations, from a region in the south that annually experiences moderate hypoxia to a region in the north where oxygen remains above hypoxic levels. The specific hypotheses tested were that low oxygen leads to: (1) increased dominance of gelatinous relative to crustacean zooplankton, (2) increased dominance of cyclopoid copepods relative to calanoid copepods, and (3) overall decreased zooplankton abundance and biomass at hypoxic sites compared to where oxygen levels are high. Additionally, we examined whether the temporal stability of community structure was decreased by hypoxia. We found evidence of a shift toward more gelatinous zooplankton and lower total zooplankton abundance and biomass at hypoxic sites, but no clear increase in the dominance of cyclopoid relative to calanoid copepods. We also found the lowest variance in community structure at the most hypoxic site, in contrast to our prediction. Hypoxia can fundamentally alter marine ecosystems, but the impacts differ among systems.

Regional Dispersal Influences Zooplankton Community Response to Dreissena polymopha Invasion

2018 ◽  
Author(s):  
Katrina Furlanetto
Keyword(s):  
Community Structure ◽  
Zebra Mussel ◽  
Field Experiments ◽  
Resource Competition ◽  
Zooplankton Community ◽  
Zebra Mussels ◽  
Community Response ◽  
Zooplankton Community Structure ◽  
Local Species ◽  
Presence And Absence

Aquatic systems are becoming increasingly susceptible to invasive species whereby local species are reduced in abundance and richness leading to changes in many food webs. Dispersal of species from surrounding lakes may provide a natural mechanism to increase local resistance by providing a diversity of locally adapted species to colonize affected communities. This study examined how zooplankton dispersal could potentially reduce the effects of the invasive zebra mussel, Dreissena polymorpha, on zooplankton community total abundance, species richness and diversity. Field experiments were conducted in 20 large tanks, with five replicates, to observe zooplankton community response to (1) the presence and absence of zebra mussels, and (2) the presence and absence of regional disperser zooplankton. Live regional zooplankton, from six surrounding lakes, were added fortnightly to dispersal treatments, while heat-killed zooplankton were added to no-dispersal treatments.  All tanks were sampled for chlorophyll and zooplankton community samples prior to dispersal additions. Zooplankton were counted and identified as cladocerans and copepods (macrozooplankton), and rotifers (microzooplankton) to species. In the presence of mussels, chlorophyll was significantly depleted, reducing nutrient availability. All zooplankton richness and abundance decreased suggesting strong resource competition and direct predation by mussels. Dispersal did not affect macrozooplankton community structure, however, dispersal influenced the effect of zebra mussels on rotifers, further decreasing richness.  This suggests species from the surrounding lakes may be highly competitive among local species, further proposing that regional species may influence zooplankton community structure and responses to zebra mussel invasion, but the effect is species dependent. 

Zooplankton community response to experimental acidification in boreal shield lakes with different ecological histories

2007 ◽  
Vol 64 (6) ◽  
pp. 887-898 ◽  
Author(s):  
Alison M Derry ◽  
Shelley E Arnott
Keyword(s):  
Lake Water ◽  
Biotic Interactions ◽  
Zooplankton Community ◽  
Acid Tolerance ◽  
Dispersal Limitation ◽  
Community Response ◽  
Boreal Lakes ◽  
Local Conditions ◽  
Water Ph ◽  
Zooplankton Communities

Community responses to acidification and recovery of boreal lakes are poorly understood, particularly after several years of recovered lake-water pH (pH ≥ 6.0). We tested if zooplankton communities in two circumneutral lakes with different acidification histories were adapted to historical lake-water pH with a reciprocal transplant field enclosure experiment. A second objective was to assess the influence of local environments on zooplankton survival and abundance. Differences in acid tolerance could be detected in some zooplankton among the two lakes with different acidification histories — zooplankton from acid-recovering Carlyle Lake, recovered to pH ≥ 6.0 for 6 years were more speciose and maintained higher total abundance at pH 4.8 than the community from a buffered lake. The zooplankton community in this historically acidified lake was comprised of two dominant species with acid-adaptable tolerances, Holopedium gibberum and Leptodiaptomus minutus. High establishment of transplanted zooplankton in our experiment has important implications for the recovery of zooplankton communities because it suggests that local conditions are suitable for most species in acid-recovering lakes with pH ≥ 6.0 and that other factors such as dispersal limitation and biotic interactions may be impeding recovery.

scholarly journals Zooplankton community response to the winter 2013 deep convection process in the NWMediterranean Sea

2017 ◽  
Vol 122 (3) ◽  
pp. 2319-2338 ◽  
Author(s):  
Katty Donoso ◽  
François Carlotti ◽  
Marc Pagano ◽  
Brian P. V. Hunt ◽  
Rubén Escribano ◽  
...  
Keyword(s):  
Deep Convection ◽  
Zooplankton Community ◽  
Community Response

RNA metabarcoding helps reveal zooplankton community response to environmental stressors

2021 ◽  
pp. 118446
Author(s):  
Phillip J. Ankley ◽  
Yuwei Xie ◽  
Sonya Havens ◽  
Lisa Peters ◽  
Lauren Timlick ◽  
...  
Keyword(s):  
Zooplankton Community ◽  
Community Response ◽  
Environmental Stressors

scholarly journals Zooplankton community response to enhanced turbulence generated by water-level decrease in Lake Balaton, the largest shallow lake in Central Europe

2011 ◽  
Vol 56 (6) ◽  
pp. 2211-2222 ◽  
Author(s):  
Làszló G.-Tóth ◽  
Laura Parpala ◽  
Csilla Balogh ◽  
Istvàn Tàtrai ◽  
Eszter Baranyai
Keyword(s):  
Water Level ◽  
Central Europe ◽  
Shallow Lake ◽  
Zooplankton Community ◽  
Community Response ◽  
Lake Balaton

Zooplankton community response to reservoir aging

Hydrobiologia ◽  
1996 ◽  
Vol 339 (1-3) ◽  
pp. 13-21 ◽  
Author(s):  
Arthur Popp ◽  
Kyle D. Hoagland ◽  
Gary L. Hergenrader
Keyword(s):  
Zooplankton Community ◽  
Community Response

Unknown and Under-Researched: The Anatomy of Drinking Under Control Programs

2017 ◽  
Vol 63 (5) ◽  
pp. 277-288
Author(s):  
Harald Klingemann ◽  
Justyna Klingemann
Keyword(s):  
Quality Of Life ◽  
Harm Reduction ◽  
Evaluation Studies ◽  
Mission Statements ◽  
Community Response ◽  
Limited Resources ◽  
Admission Criteria ◽  
Control Programs ◽  
Institutional Order

Abstract. Introduction: While alcohol treatment predominantly focuses on abstinence, drug treatment objectives include a variety of outcomes related to consumption and quality of life. Consequently harm reduction programs tackling psychoactive substances are well documented and accepted by practitioners, whereas harm reduction programs tackling alcohol are under-researched and met with resistance. Method: The paper is mainly based on key-person interviews with eight program providers conducted in Switzerland in 2009 and up-dated in 2015, and the analysis of reports and mission statements to establish an inventory and description of drinking under control programs (DUCPs). A recent twin program in Amsterdam and Essen was included to exemplify conditions impeding their implementation. Firstly, a typology based on the type of alcohol management, the provided support and admission criteria is developed, complemented by a detailed description of their functioning in practice. Secondly, the case studies are analyzed in terms of factors promoting and impeding the implementation of DUCPs and efforts of legitimize them and assess their success. Results: Residential and non-residential DUCPs show high diversity and pursue individualized approaches as the detailed case descriptions exemplify. Different modalities of proactively providing and including alcohol consumption are conceptualized in a wider framework of program objectives, including among others, quality of life and harm reduction. Typically DUCPs represent an effort to achieve public or institutional order. Their implementation and success are contingent upon their location, media response, type of alcohol management and the response of other substance-oriented stake holders in the treatment system. The legitimization of DUCPs is hampered by the lack of evaluation studies. DUCPs rely mostly – also because of limited resources – on rudimentary self-evaluations and attribute little importance to data collection exercises. Conclusions: Challenges for participants are underestimated and standard evaluation methodologies tend to be incompatible with the rationale and operational objectives of DUCPs. Program-sensitive multimethod approaches enabled by sufficient financing for monitoring and accompanying research is needed to improve the practice-oriented implementation of DUCPs. Barriers for these programs include assumptions that ‘alcohol-assisted’ help abandons hope for recovery and community response to DUCPs as locally unwanted institutions (‘not in my backyard’) fuelled by stigmatization.

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