Wyniki wyszukiwania - Biblioteka Nauki

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Taxonomic classification of algae by the use of chlorophyll a fluorescence

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Szymański N. , Dąbrowski P. , Zabochnicka-Świątek M. , Panchal B. , Lohse D. , Kalaji H. M.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2017

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tom Vol. 26, No. 4

470--480

EN

Natural water reservoirs are very important ecosystems thus they should be under continuous monitoring and protection. In water of low quality, the algal blooms develop develops vastly. The knowledge of algal species composition is necessary for understanding this process. There are a few traditional group-specific methods of microalgae classification, but they are often labour-intense and time-consuming. Moreover, the samples must be prepared and/or collected before getting any results. Non-invasive chlorophyll fluorescence analysis offers an alternative approach and potentially allows in situ estimation of algal concentration. In this work the fluorometric methods to estimate algae content in water and to differentiate algal populations is presented.

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Massive occurrence of the alien invasive species Pleodorina indica (Volvocales, Chlorophyta) in a reservoir located in urban areas of Central Poland

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Knysak P. , Żelazna-Wieczorek J.

Oceanological and Hydrobiological Studies

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2017

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tom Vol. 46, No. 1

116--122

EN

Pleodorina indica (Iyengar) H. Nozaki is a rare species from the Volvocaceae family (Chlorophyta, Volvocales), which naturally occurs in aquatic ecosystems of the tropical climate zones. This is the first record of this species I in Poland in a flow-through man-made reservoir on the Olechówka River in Łódź. The sampling site of P. indica in Łódź is the northernmost site in Europe. Among other records, the species has been also reported from Austria in 1996 and the Czech Republic in 2003. During the summer of 2015, abundant occurrence of this species was observed at the sampling site, at extremely high air and water temperatures. Physical parameters in the reservoir and the duration of the P. indica bloom were measured. In addition, morphological features of the species were observed with the use of light and confocal microscopy.

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Response of coastal phytoplankton to upwelling induced hydrological changes in the Alappuzha mud bank region, southwest coast of India

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Madhu N. V. , Anil P. , Meenu P. , Gireeshkumar T. R. , Muraleedharan K. R. , Rehitha T. V. , Dayana M. , Vishal C. R.

Oceanologia

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2021

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tom No. 63 (2)

261--275

EN

The response of phytoplankton community to the co-existing events of coastal upwelling and mud banks in the nearshore waters of Alappuzha (15 m depth), located in the southwest coast of India from April to November 2016, is described based on size-fractionated phytoplankton biomass (chlorophyll a), primary production and community composition. The study region exhibited well-distinct spatio-temporal hydrological changes because of the influence of wind-driven coastal upwelling, prevalent during the southwest monsoon (SWM) period. However, the formation of mud banks, in addition to coastal upwelling, was observed at station M2, which facilitated the substantial increase of water column turbidity and inorganic nutrients (ammonium, phosphate, and silicate) during and after the peak SWM period compared to the non-mud bank reference stations (M1 and M3). The prevailing hydrological changes were complemented the corresponding phytoplankton productivity patterns, in which profound domination of nanophytoplankton (2-20 µm) chlorophyll a and primary production was observed throughout the study region, irrespective of seasons. The SIMPER analysis, based on phytoplankton (mostly >20 µm) species composition data (microscopy), revealed the formation of certain characterizing species, mainly comprised of diatoms and dinoflagellates. The consistent predominance of the nanophytoplankton, established under variable hydrological scenarios, showed that the inorganic nutrient (specifically ammonium) availability was instrumental in defining the widespread growth of nanophytoplankton community compared to the prevailing light levels. The present study thus revealed that even the small-sized phytoplankton community could survive in the nutrient-enriched coastal waters, characterised by the co-existing upwelling and mud banks.

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Narrowband shortwave minima of multispectral reflectance as indication of algal blooms associated with the mesoscale variability in the Brazil-Malvinas Confluence

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Karabashev G. S. , Evdoshenko M. A.

Oceanologia

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2018

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tom 60

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nr 4

5

Compensatory growth of the bloom-forming dinoflagellate Prorocentrum donghaiense induced by nitrogen stress

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Cai Z. , Duan S. , Zhu H.

Oceanologia

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2013

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tom 55

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nr 1

6

Algal bloom, hypoxia, and mass fish kill events in the backwaters of Puducherry, Southeast coast of India

75%

Mishra P. , Naik S. , Babu P. V. , Pradhan U. , Begum M. , Kaviarasan T. , Vashi A. , Bandyopadhyay D. , Ezhilarasan P. , Panda U. S. , Ramana Murthy M. V.

Oceanologia

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2022

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tom No. 64 (2)

396--403

EN

The Chunnambar backwater of Puducherry experienced changes in water quality over a period. The most significant impact was the sudden mass fish kill event coincided with the Pseudo-nitzschia bloom. On 25th September 2019, a mass fish kill event was reported, i.e. about a 0.25 metric ton (MT) floating on the water surface. On 29th September 2019, a much larger (∼1 MT) than the earlier incident had occurred. Sampling was carried out to assess the causes thereof. The results indicate that high organic matter and bacterial loads accumulated in the water and sediment due to the closure of the river mouth for an extended period. High ammonia (61.4 µM) and phosphate (6.2 µM) levels attributed to eutrophic conditions in the water column and hypoxemia due to low dissolved oxygen (1.62 mg/L at St.1 and 2.4 mg/L at St.5) and algal bloom were the proximate cause of these sudden fish kills. We recommend periodic dredging to facilitate proper water exchange between the backwater and the sea.

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Seasonal assessment of the trophic status in the coastal waters adjoining Tuticorin harbor in relation to water quality and plankton community in the Gulf of Mannar, India

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Sathishkumar R. S. , Sundaramanickam A. , Mohanty A. K. , Sahu G. , Ramesh T. , Balachandar K. , Nithin A. , Surya P. , Silambarasann K.

Oceanologia

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2022

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tom No. 64 (4)

749--768

EN

Seasonal variations in hydrography, trophic status, and plankton community structure were studied along the Tuticorin coastal waters (TCWs) in the Gulf of Mannar (GoM). Samples were collected in 2015 and 2016 to analyze physico-chemical (temperature, pH, salinity, suspended particulate matter (SPM), dissolved oxygen (DO), nutrients, etc.) and biological parameters (chlorophyll-a, phytoplankton, and zooplankton). The trophic index (TRIX) and eutrophication index (EI) were calculated to describe the eutrophication status of TCWs. Temperature, pH, salinity, DO, and SPM showed seasonality due to the impact of the northeast monsoon. A massive bloom of Trichodesmium erythraeum was observed, with a visible impact on water quality and the plankton community. The cluster and principal component analysis indicated the bloom event as a distinct phenomenon. ANOVA results showed significant seasonal variations rather than spatial variations. According to the trophic indices, the area had a low trophic level in 2015 and a high trophic level in 2016. The Tuticorin inshore waters had the highest TRIX and EI values during the dominance of cyanobacteria bloom in the post-monsoon 2016. The trophic indices had a positive relationship with phytoplankton abundance but showed an inverse relation with zooplankton abundance. The overall range of the TRIX index (3.18–5.96) indicated that the environment was oligotrophic to eutrophic, and EI values (0.72–21.61) indicated that the state of coastal waters was moderate to poor. This study states that periodic monsoonal flow and frequent algal bloom events have a significant impact on the GoM coastal waters.

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Historical occurrences of marine microalgal blooms in Indian Peninsula: Probable causes and implications

75%

Oyeku O. G. , Mandal S. K.

Oceanologia

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2021

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tom 63

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nr 1

9

Influence of salinity on the growth of Nodularia spumigena Mertens

75%

Musial A. , Plinski M.

Oceanological and Hydrobiological Studies

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2003

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tom 32

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nr 2

10

The effects of cyanobacterial blooms on MODIS-L2 data products in the Southern Caspian Sea

63%

Naghdi K. , Moradi M. , Kabiri K. , Rahimzadegan

Oceanologia

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2018

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tom 60

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nr 3

11

Habitat factors accompanying the mass appearance of nuisance, invasive and alien algal species Gonyostomum semen (Ehr.) Diesing in humic lakes of Eastern Poland

63%

Peczula W.

Polish Journal of Ecology

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2013

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tom 61

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nr 3

EN

Mass occurrence of nuisance algal species Gonyostomum semen is observed in European humic lakes since 1970s, initially in the Scandinavian countries, then in eastern, central and western part of the continent. In 2002 mass appearances of this flagellate were found in three of 12 investigated humic lakes situated in the Eastern Poland. Lakes with Gonyostomum were situated within small geographical area. The biomass of algae was usually higher than 1 mg dm⁻³ and during summer its distribution was frequently uneven with higher values found in deeper layers. Based on this research we conclude, that G. semen during its spreading on the new area had preferred 6–8 m deep and small lakes with thermal and oxygen stratification as well as with low calcium content, slightly acidic to slightly alkaline pH and moderate color of water.

12

Dinoflagellate cyst distribution in recent sediments along the South-East coast of India

63%

Narale D. D. , Patil J. S. , Anil A. C.

Oceanologia

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2013

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tom 55

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nr 4

13

A review on lake eutrophication dynamics and recent developments in lake modeling

63%

Bhagowati B. , Ahamad K. U.

International Journal of Ecohydrology and Hydrobiology

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2019

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tom 19

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nr 1

14

Water type quantification in the Skagerrak, the Kattegat and off the Jutland West coast

63%

Kristiansen T. , Aas E.

Oceanologia

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2015

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tom 57

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nr 2

15

Species-level associations of phytoplankton with environmental variability in the Neva Estuary (Baltic Sea)

63%

Golubkov M. , Nikulina V. , Golubkov S.

Oceanologia

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2021

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tom 63

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nr 1

16

Response of coastal phytoplankton to upwelling induced hydrological changes in the Alappuzha mud bank region, Southwest coast of India

63%

Madhu N. V. , Anil P. , Meenu P. , Gireeshkumar T. R. , Muraleedharan K. R. , Rehitha T. V. , Dayana M. , Vishal C. R.

Oceanologia

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2021

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tom 63

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nr 2

17

A study of episodic events in the Baltic Sea – combined in situ and satellite observations

63%

Lysiak-Pastuszak E. , Bartoszewicz M. , Bradtke K. , Darecki M. , Drgas N. , Kowalczuk P. , Krasniewski W. , Krezel A. , Krzyminski W. , Lewandowski L. , Mazur-Marzec H. , Piliczewski B. , Sagan S. , Sutryk K. , Witek B.

Oceanologia

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2012

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tom 54

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nr 2

EN

A project was developed concerning the operational system of surveillance and the recording of episodic events in the Baltic Sea. In situ information was to be combined with multi-sensory satellite imagery to determine the extent of algal blooms, to track their evolution and that of rapid environmental events like hydrological fronts. The main element of the system was an autonomous Ferry Box module on a ferry operating between Gdynia and Karlskrona, automatically measuring temperature, salinity and chlorophyll a fluorescence. At pre-selected locations, discrete water samples were collected, which were subsequently analysed for their phytoplankton content, and algal hepato- and neurotoxins; they were also used in toxicity tests with Artemia franciscana.

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Ecohydrodynamic model of the Baltic Sea. Part 2. Validation of the model

63%

Jedrasik J. , Szymelfenig M.

Oceanologia

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2005

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tom 47

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nr 4

EN

The ecohydrodynamic model for the Baltic Sea consists of two interacting parts: one describes the hydrodynamics of the water (3HD), the other organic matter production and destruction (ProDeMo).The results of the simulation were validated.The modelled processes were compared with direct observations, which demonstrated the recurrence of cycles, from the spring diatom blooms through the summer depletion of nutrient salts and algal blooms, to autumn blooms of diatoms and the subsequent destruction of organic matter, and intensified mineralisation of detritus in winter.Ca libration yielded a set of coefficients complementing the algorithm of equations describing the production and destruction of organic matter in the coastal zone.V erification of the model has demonstrated that in multi-year simulations it is stable and also that it follows the laws of conservation of mass and energy.T he third procedural stage of the model investigation was validation, in which statistical measures in the form of bias, correlation coefficients and effectiveness between simulations and observations not used in calibration describe the quality of ecohydrodynamic modelling in southern Baltic Sea waters.

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Limnological features of a shallow eutrophic lake (Lake Pamvotis, Greece) with emphasis on zooplankton community structure

51%

Antonopoulos A. , Kagalou I. , Michaloudi E. , Leonardos I.

Oceanological and Hydrobiological Studies

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2008

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tom 37

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nr Suppl.1

20

SatBałtyk – A Baltic environmental satellite remote sensing system – an ongoing project in Poland. Part 1: Assumptions, scope and operating range

51%

Wozniak B. , Bradtke K. , Darecki M. , Dera J. , Dudzinska-Nowak J. , Dzierzbicka-Glowacka L. , Ficek D. , Furmanczyk K. , Kowalewski M. , Krezel A. , Majchrowski R. , Ostrowska M. , Paszkuta M. , Ston-Egiert J. , Stramska M. , Zapadka T.

Oceanologia

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2011

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tom 53

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nr 4

EN

This article is the first of two papers on the remote sensing methods of monitoring the Baltic ecosystem, developed by a Polish team. The main aim of the five- year SatBałtyk (2010–2014) research project (Satellite Monitoring of the Baltic Sea Environment) is to prepare the technical infrastructure and set in motion operational procedures for the satellite monitoring of the Baltic environment. This system is to characterize on a routine basis the structural and functional properties of this sea on the basis of data supplied by the relevant satellites. The characterization and large-scale dissemination of the following properties of the Baltic is anticipated: the solar radiation influx to the sea’s waters in various spectral intervals, energy balances of the short- and long-wave radiation at the Baltic Sea surface and in the upper layers of the atmosphere over the Baltic, sea surface temperature distribution, dynamic states of the water surface, concentrations of chlorophyll a and other phytoplankton pigments in the Baltic water, distributions of algal blooms, the occurrence of upwelling events, and the characteristics of primary organic matter production and photosynthetically released oxygen in the water. It is also intended to develop and, where feasible, to implement satellite techniques for detecting slicks of petroleum derivatives and other compounds, evaluating the state of the sea’s ice cover, and forecasting the hazards from current and future storms and providing evidence of their effects in the Baltic coastal zone. The ultimate objective of the project is to implement an operational system for the routine determination and dissemination on the Internet of the above-mentioned features of the Baltic in the form of distribution maps as well as plots, tables and descriptions characterizing the state of the various elements of the Baltic environment. The main sources of input data for this system will be the results of systematic recording by environmental satellites and also special-purpose ones such as TIROS N/NOAA, MSG (currently Meteosat 9), EOS/AQUA and ENVISAT. The final effects of the SatBałtyk project are to be achieved by the end of 2014, i.e. during a period of 60 months. These two papers present the results obtained during the first 15 months of the project. Part 1 of this series of articles contains the assumptions, objectives and a description of the most important stages in the history of our research, which constitute the foundation of the current project. It also discusses the way in which SatBałtyk functions and the scheme of its overall operations system. The second article (Part 2), will discuss some aspects of its practical applicability in the satellite monitoring of the Baltic ecosystem (see Woźniak et al. (2011) in this issue).