Differences in rotifer communities in two freshwater bodies of different trophic degree (Lake Ohrid and Lake Dojran, Macedonia)

AbstractWe investigated monogonont rotifers in two natural Macedonian lakes that greatly differ in age, size and trophic state: Lake Ohrid and Lake Dojran. A main characteristic of Lake Ohrid is the scarcity of nutrients and consequently a low level of primary production. Lake Dojran represents a typical eutrophic lake. Results clearly indicate that species numbers are negatively correlated with trophic degree. Qualitative analyses of rotifer compositions in Lakes Ohrid and Dojran showed the presence of 70 and 55 taxa, respectively. Rotifer assemblages differed in their community structure, population densities, and the occurrence pattern of dominant species. The density of rotifers increased with increasing nutrient concentration, varying from min. 0.67 ind. L−1 in June, 2006 to max. 8.2 ind. L−1 in July, 2004 in Lake Ohrid, whereas min. 28.8 ind. L−1 (in December, 2005) and max. 442.5 ind. L−1 (in September, 2005) were recorded in Lake Dojran. Gastropus stylifer and Keratella cochlearis were the most abundant species in the pelagic zone of Lake Ohrid, averaging monthly densities of 1.2 ind. L−1 and 0.6 ind. L−1, respectively, thereby contributing 29% and 15% to rotifer abundance. In contrast, Lake Dojran rotifers were dominated by Brachionus spp. Brachionus diversicornis and Brachionus calyciflorus f. amphiceros were most abundant, comprising 40% and 25% of the total rotifer density. These results corroborate our idea, that the trophic state is an important factor in determining the composition of rotifer communities.

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Use of rotifer trophic state indices to show the effect of hydrobionts and nutrients on water trophic status in mesocosms

Oceanological and Hydrobiological Studies ◽

10.1515/ohs-2020-0011 ◽

2020 ◽

Vol 49 (2) ◽

pp. 123-131

Author(s):

Jolanta Ejsmont-Karabin ◽

Irina Feniova ◽

Iwona Kostrzewska-Szlakowska ◽

Marek Rzepecki ◽

Varos G. Petrosyan ◽

...

Keyword(s):

Dreissena Polymorpha ◽

Trophic State ◽

Trophic Status ◽

Eutrophic Lake ◽

Zebra Mussels ◽

Pelagic Zone ◽

Species Structure ◽

Rotifer Communities

AbstractWe have determined how Crustacea, zebra mussels (Dreissena polymorpha), fish and nutrients affect the trophic state in mesocosms filled with water collected from the pelagic zone of a eutrophic lake. We hypothesized that the pool of nutrients would increase both directly due to the input of phosphorus and nitrogen and/or indirectly due to the introduction of animal biomass. We used trophic state indices based on the abundance and species structure of rotifers to assess changes in the trophic state in mesocosms. The role of small detritophages in rotifer communities increased as a result of treatments. Our results clearly demonstrated that D. polymorpha was able to reduce the trophic status of mesocosm waters as indicated by reduced rotifer trophic state indices regardless of interactions with other treatment factors. Contrary to our expectations, neither the nutrients added at the beginning of the experiment nor the introduction of crustaceans or fish affected the rotifer trophic indices.

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Susceptibility to Degradation, the Causes of Degradation, and Trophic State of Three Lakes in North-West Poland

Water ◽

10.3390/w12061635 ◽

2020 ◽

Vol 12 (6) ◽

pp. 1635 ◽

Cited By ~ 1

Author(s):

Agnieszka Tórz ◽

Małgorzata Bonisławska ◽

Agnieszka Rybczyk ◽

Arkadiusz Nędzarek ◽

Adam Tański

Keyword(s):

Aquatic Ecosystem ◽

Trophic State ◽

Eutrophic Lake ◽

Morphometric Characteristics ◽

Small Lakes ◽

Effective Protection ◽

North West ◽

The Impact ◽

North Western ◽

Phosphorus Levels

Effective protection of lakes against degradation requires a detailed recognition of the factors leading to their eutrophication. This also pertains to small lakes, which constitute an important element of various ecosystems and are crucial for maintaining biodiversity. Therefore, the aim of the study is to determine the trophic state as well as the susceptibility to degradation of three small lakes in north-western Poland: Maszewo, Starzyca, and Nowogardzkie. This study analyzes the morphometric characteristics of the lakes, the impact of the catchment, their actual trophic state, and phosphorus levels. The analysis showed varying regeneration potentials of the lakes. Maszewo Lake is eutrophic-hypertrophic, nonresilient, strongly exposed to influence from the catchment, with phosphorus levels within the norm. Starzyca Lake is a eutrophic lake, not very resilient to the influence of the catchment, with excessive phosphorus levels. Nowogardzkie Lake is a eutrophic lake with moderate resilience to degradation, but with excessive phosphorus levels, which endangers the functioning of this aquatic ecosystem. In all the lakes, phosphorus supply was predominantly internal. Restoration of these lakes could be performed by completely cutting off the inflow of nutrients, as well as reclamation involving the deactivation of phosphorus (e.g., by precipitation) as well as the removal of the bottom sediments responsible for the internal supply of phosphorus.

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Effects of eutrophication on sedimentary organic carbon cycling in five temperate lakes

Biogeosciences ◽

10.5194/bg-16-3725-2019 ◽

2019 ◽

Vol 16 (19) ◽

pp. 3725-3746 ◽

Cited By ~ 3

Author(s):

Annika Fiskal ◽

Longhui Deng ◽

Anja Michel ◽

Philip Eickenbusch ◽

Xingguo Han ◽

...

Keyword(s):

Organic Carbon ◽

Water Column ◽

Trophic State ◽

Microbial Respiration ◽

Accumulation Rate ◽

Eutrophic Lake ◽

Accumulation Rates ◽

Artificial Lake ◽

Eutrophic Lakes ◽

Lake Ecosystems

Abstract. Even though human-induced eutrophication has severely impacted temperate lake ecosystems over the last centuries, the effects on total organic carbon (TOC) burial and mineralization are not well understood. We study these effects based on sedimentary records from the last 180 years in five Swiss lakes that differ in trophic state. We compare changes in TOC content and modeled TOC accumulation rates through time to historical data on algae blooms, water column anoxia, wastewater treatment, artificial lake ventilation, and water column phosphorus (P) concentrations. We furthermore investigate the effects of eutrophication on rates of microbial TOC mineralization and vertical distributions of microbial respiration reactions in sediments. Our results indicate that the history of eutrophication is well recorded in the sedimentary record. Overall, eutrophic lakes have higher TOC burial and accumulation rates, and subsurface peaks in TOC coincide with past periods of elevated P concentrations in lake water. Sediments of eutrophic lakes, moreover, have higher rates of total respiration and higher contributions of methanogenesis to total respiration. However, we found strong overlaps in the distributions of respiration reactions involving different electron acceptors in all lakes regardless of lake trophic state. Moreover, even though water column P concentrations have been reduced by ∼ 50 %–90 % since the period of peak eutrophication in the 1970s, TOC burial and accumulation rates have only decreased significantly, by ∼ 20 % and 25 %, in two of the five lakes. Hereby there is no clear relationship between the magnitude of the P concentration decrease and the change in TOC burial and accumulation rate. Instead, data from one eutrophic lake suggest that artificial ventilation, which has been used to prevent water column anoxia in this lake for 35 years, may help sustain high rates of TOC burial and accumulation in sediments despite water column P concentrations being strongly reduced. Our study provides novel insights into the influence of human activities in lakes and lake watersheds on lake sediments as carbon sinks and habitats for diverse microbial respiration processes.

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The phytoplankton of Guanabara Bay, Brazil: I. historical account of its biodiversity

Biota Neotropica ◽

10.1590/s1676-06032010000200030 ◽

2010 ◽

Vol 10 (2) ◽

pp. 271-293 ◽

Cited By ~ 21

Author(s):

Maria Célia Villac ◽

Denise Rivera Tenenbaum

Keyword(s):

Skeletonema Costatum ◽

Abundant Species ◽

Oxygen Depletion ◽

Species Level ◽

Frequency Of Occurrence ◽

Guanabara Bay ◽

Historical Account ◽

Species Numbers ◽

Time Variations ◽

Technical Capability

This is a historical account of the biodiversity of phytoplankton in Guanabara Bay, Brazil. It is based on 57 publications that refer to sampling carried out between 1913 and 2004. The publications included are those with direct microscopic identification. Although 80% of the studies focus on ecological issues that tend to mention only the most abundant species, 24 publications provide comprehensive check-lists at the species level, especially of taxa > 20 μm. The inventory of species includes, to date, 308 taxa among 199 diatoms, 90 dinoflagellates, 9 cyanobacteria, 5 euglenophyceans, 1 chlorophycean, 1 prasinophycean, 1 silicoflagellate, and 2 ebriids. The most conspicuous species were the dinoflagellate Scrippsiella trochoidea and diatoms from the Skeletonema costatum complex. The first was the theme of the very first publication in the area (Faria 1914) that reported on its bloom associated with the mass mortality of fish due to oxygen depletion; it is still often found in high abundances (10(6) cell.L-1) in more protected areas. The second was long considered in the literature as a cosmopolitan and opportunistic species, until the recent discovery of cryptic species within the genus; taxonomic re-evaluation of local populations is, therefore, needed. Besides these two species, only other 25 species stood out in terms of frequency of occurrence and widespread distribution in the Bay, some known to be implicated in harmful blooms elsewhere. The biodiversity of dinoflagellates, especially within the Gymnodiniales, and that of other unidentified flagellates (Haptophyceae, Cryptophyceae, Prasinophyceae, Raphidophyceae) is largely underestimated because of the use of fixatives that distort/destroy diagnostic characters. From the initial inventory of 124 taxa published in 1917 and the subsequent additions in species numbers, one can have a false perception that the phytoplankton biodiversity has increased throughout the years, despite the overall increase in eutrophication observed in Guanabara Bay. The reason for this may be twofold: 1) it is an artifact caused by our progressively improving technical capability to detect and identify species and 2) the possible effects of eutrophication could be better perceived when the community structure is evaluated, that is, when space-time variations in the abundances of the populations (rather than just number of species) are also taken into account.

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Differentiated macrophyte types as a habitat for rotifers in small mid-forest water bodies

Biologia ◽

10.2478/s11756-009-0178-4 ◽

2009 ◽

Vol 64 (6) ◽

Cited By ~ 5

Author(s):

Anna Basińska ◽

Natalia Kuczyńska-Kippen

Keyword(s):

Water Body ◽

Catchment Area ◽

Trophic State ◽

Positive Relationship ◽

Open Water ◽

Physical Chemical ◽

Rotifer Community ◽

Chemical Factors ◽

Rotifer Communities ◽

Eutrophic Species

AbstractThe rotifer community structure may be shaped by a variety of environmental factors, including biological parameters, such as predation or competition, as well as by physical-chemical factors, among which the kind of macrophyte substratum and parameters relating to the trophic state and to the catchment area conditions are of great importance. Another impact on rotifer composition, abundance and frequency may be expected when considering differentiated macrophyte types (including helophytes, nymphaeids and elodeids) within a group of eight ponds located within a mid-forest catchment area, which was the main aim of the present study. Detailed analysis on the participation of indicator eutrophic rotifer species provided an additional goal of this investigation in order to qualify the trophic state of this kind of water body located within the Wielkopolska region, in the central western part of Poland.The presence of 117 taxa, including 7 species that are rare or infrequently distributed in the Polish fauna was recorded. The number of taxa and rotifer abundance differed greatly in respect to the specific water body and to the type of substratum. The vegetated zones dominated by elodeids were characterised by the most various and most abundant rotifer communities as well as by the highest values of the Shannon-Weaver index. This reflects a positive relationship between the heterogeneity of habitat and the structure of rotifer communities. It was also found that helophytes and the open water zone possessed the highest, while elodeids the lowest percentage of eutrophic species.

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Were there any changes in zooplankton communities due to the limitation of restoration treatments?

Limnological Review ◽

10.2478/limre-2021-0009 ◽

2021 ◽

Vol 21 (2) ◽

pp. 91-104

Author(s):

Joanna Rosińska ◽

Katarzyna Kowalczewska-Madura ◽

Anna Kozak ◽

Wanda Romanowicz-Brzozowska ◽

Ryszard Goldyn

Keyword(s):

Water Quality ◽

Species Composition ◽

Trophic State ◽

Species Number ◽

Trophic State Index ◽

Keratella Cochlearis ◽

Bottom Waters ◽

Phosphorus Inactivation ◽

State Index ◽

Zooplankton Communities

Abstract Zooplankton is a good indicator of water quality state. Analysing the species composition and abundance, it is possible to assess the condition of the water body and predict the direction of changes. The aim of the study was to analyse the zooplankton in a shallow urban lake, in which restoration was limited to one method, i.e. wind-aeration. The results were compared with the earlier data obtained during sustainable restoration (three methods: wind-aeration, phosphorus inactivation, biomanipulation) and before the restoration period. The zooplankton was sampled monthly in 2015 and 2016 in the deepest place of the lake from the surface to the bottom. The trophic state was determined based on rotifer trophic state index for lakes (TSIROT). Although the species composition of zooplankton communities varied very little among the restoration periods (Keratella cochlearis f. tecta mainly dominated), significant changes in the abundance of zooplankton were found in the analysed lake. The maximum of total abundance was noted in 2015, almost 5500 ind. L−1, and in the next year its decrease was almost 3-fold, to ca. 1800 ind. L-1. Based on TSIROT, the water was still eutrophic. Leaving only one method of restoration (namely, oxygenation of the bottom waters) proved insufficient to support the development of crucial organisms as cladocerans. The changes in the abundance could have resulted more from seasonal changes than from the effects of aeration. A reduction in species number and maintaining a high proportion of rotifers typical for a high trophic state indicated a return of the ecosystem to its pre-restoration state. High variability in the rotifer abundance indicated a continuous imbalance of the ecosystem. Previous restoration treatments using several methods simultaneously showed better effectiveness. The change of strategy of restoration before obtaining a stable improvement of water quality destroyed previously achieved effects.

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Rotifer communities of religious water bodies of Haryana (India): Biodiversity, distribution and ecology

Journal of Applied and Natural Science ◽

10.31018/jans.v6i2.527 ◽

2014 ◽

Vol 6 (2) ◽

pp. 729-737

Author(s):

Anita Bhatnagar ◽

Pooja Devi

Keyword(s):

Trophic Status ◽

Water Bodies ◽

Environment Change ◽

Regional Environment ◽

Keratella Cochlearis ◽

Factors Affecting ◽

Main Factors ◽

Distribution And Ecology ◽

Specific Species ◽

Rotifer Communities

The rotifer communities of eight religious water bodies of Haryana characterized by different trophic status reveal 44 species belonging to 15 genera and 12 families, represent the richest biodiversity of rotifers. Brachionus, Asplanchna and Keratella genus were found to be pollution tolerant species and common at all the selected water bodies viz., Brahmsarovar and Jyotisar at Kurukshetra; Saraswati tirth, Pehowa; Kapalmochan, Yamunanagar; Phalgu tirth, Kaithal; Banganga tirth , Dayalpur; Pandu Pindara, Jind and Kultarn Tirth, Kirmach. whereas Gastropus, Testudinella, Monostyla clasterocerca, Lecane arcula, Filina terminalis were found to be specific at Brahmsarovar (site 1); Filinia longiseta at Phalgu (site 2); Lecane ploenensis, Euchlanis dilata at Pehowa (site 3); B. budapestinensis, B. nilsoni, Asplanchna brightwelli, Asplanchna sieboldii, Polyurthera were specific to Kirmach (site 4); Monostyla decipiens, Anauraepsis nevicula at Jyotisar (site 5); Trichocera porcellus at Kapal mochan (site 7); Keratella cochlearis, Trichocera capucina were found to be specific at the BanGanga (site 8,). However, no specific species appeared at Pandu Pindara (site 6). Seasonal variations were also observed at all the sites during spring, monsoon, post monsoon and in winters. A positive correlation of rotifer abundance was observed with temperature (r = 0.356, P < 0.05), BOD (r = 0.413, P < 0.05) and Ammonia (r = 0.378, P < 0.05) whereas a negative correlation was observed with DO (r = -0.385, P < 0.05) showing that these were the main factors affecting the richness, diversity and density of rotifers. The rotifer communities of each site can be reconstructed from the tables and figures making this inventory an important benchmark for evaluating future regional environment change.

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Spatial and temporal variations of tintinnids (Ciliata: Protozoa) in the Bay of Mersin, Northeastern Mediterranean Sea

Mediterranean Marine Science ◽

10.12681/mms.18074 ◽

2019 ◽

Vol 20 (2) ◽

pp. 342 ◽

Cited By ~ 1

Author(s):

SEVIM POLAT ◽

TUBA TERBIYIK KURT ◽

SÜLEYMAN TUĞRUL

Keyword(s):

Species Composition ◽

Seasonal Variations ◽

Dominant Species ◽

Trophic State ◽

Trophic Status ◽

Temporal Variations ◽

Species Number ◽

Entire Study ◽

Species Numbers ◽

Entire Study Area

Seasonal variations in species composition and abundance of tintinnids were investigated in the eutrophic coastal and offshore waters of Mersin Bay. Twelve sampling cruises were performed from September 2008 to February 2011. A total of 85 tintinnid taxa were identified. Among the recorded genera, agglutinated Tintinnopsis had the largest number of species (12 species), followed by hyaline loricated Eutintinnius (9 species), and Proplectella (7 species). Stenosemella ventricosa, Tintinnopsis beroidea, T. compressa, Favella azorica, and Helicostemella subulata were the dominant species during the study period. There were clear seasonal variations in species composition and abundance of tintinnids. The highest number of tintinnid species occurred in January 2009 and November 2010 in the entire study area, while the lowest species number occurred in March 2009. Morever, species numbers were higher in offshore stations than coastal stations. Some species were present in the coastal area of the bay, and other species were present offshore. The highest tintinnid abundance values were found in September 2008 (820 ind L-1) and August 2009 (749 ind L-1) at coastal stations. The high abundance values in the coastal stations indicates that an increase of tintinnids is closely related to trophic status of the marine environment. In connection with these results, correlation analysis revealed that chlorophyll-a had an important effect on tintinnid abundance. Tintinnid communities may be used as a potential bio-indicator for assessing the trophic state of the coastal seas and bays.

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Epiphytic metazoans on emergent macrophytes in oxbow lakes of the Krapina River, Croatia: differences related to plant species and limnological conditions

Acta Botanica Croatica ◽

10.2478/v10184-011-0062-5 ◽

2012 ◽

Vol 71 (1) ◽

pp. 125-138 ◽

Cited By ~ 6

Author(s):

Maria Špoljar ◽

Jelena Fressl ◽

Tvrtko Dražina ◽

Matija Meseljević ◽

Zlatko Grčić

Keyword(s):

Plant Species ◽

Trophic State ◽

Food Resource ◽

Significant Negative Correlation ◽

Eutrophic Lake ◽

Trophic Levels ◽

Trophic State Index ◽

Total Density ◽

Oxbow Lakes ◽

Emergent Macrophytes

Epiphytic metazoans on emergent macrophytes in oxbow lakes of the Krapina River, Croatia: differences related to plant species and limnological conditionsThis study investigated the structure of the epiphytic metazoans on emerged macrophytes in the littoral zone of two oxbow lakes with different trophic levels. Differences in the diversity and density of the epiphytic metazoans were analyzed in relation to plant architecture (simple or complex stems), food resources (algae and detritus) and water characteristics (transparency and derived trophic state index). A significant negative correlation was found between detritus on plants as food resource, and diversity and density of epiphytic metazoans, indicating grazing of microphagous species. Rotifers dominated in diversity and density in the epiphyton on all habitats. Total density of metazoans, rotifers and copepods in epiphyton were significantly higher onMenthain mesotrophic lake than onIrisin a eutrophic lake. We presume that macrophyte belt width and trophic state governed biotic interactions and consequently epiphytic assemblages more strongly than macrophyte architecture. However, aMenthahabitat showed a slightly higher density and diversity of epiphytic metazoans in relation toIrisat the same site, but these differences were not significant.

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Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010

Limnological Review ◽

10.2478/v10194-011-0019-z ◽

2010 ◽

Vol 10 (3-4) ◽

pp. 163-172 ◽

Cited By ~ 4

Author(s):

Arkadiusz Nędzarek ◽

Agnieszka Tórz ◽

Jacek Kubiak

Keyword(s):

Dissolved Oxygen ◽

Oxygen Saturation ◽

Water Temperature ◽

Thermal Stratification ◽

Trophic State ◽

Winter Season ◽

Eutrophic Lake ◽

Vertical Profiles ◽

Oxygen Oxygen ◽

Oxygen Conditions

Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010The research in Lake Głębokie was conducted in the years 2008-2010. Sampling from three selected sites was designed in such a way that vertical profiles of the characteristics of interest were obtained. Measurements were performed to determine the content of dissolved oxygen, oxygen saturation expressed as a percentage, water temperature, total phosphorus, chlorophyll a, dry seston mass, and Secchi disk depth. During the course of a year, water temperature varied from 0.58°C to 24.72°C. However, a permanent thermal stratification was not observed in the summer season due to complete water mixing. Dissolved oxygen concentrations in the water varied within a range that started at hard-to-measure insignificant values and reached up to 9.63 mg O2 l-1, while oxygen saturation reached a maximum of 116% O2. At the same time, it was observed that oxygen conditions gradually worsened as the depth became greater. The largest oxygen deficits occurred in the winter season of 2009-2010. The oxygen conditions were typical for an eutrophic lake. Its high trophic state was confirmed by an analysis performed using the method proposed by Carlson (1977) as well as by an analysis performed according to the directives of the OECD (1982). The trophic state of this lake is borderline eutrophic and hypertrophic. The oxygen conditions found in this lake ought to be seen as not beneficial to fish.

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