Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.1997.1/2.04
P. Nõges, T. Nõges, R. Laugaste, J. Haberman, V. Kisand
{"title":"TENDENCIES AND RELATIONSHIPS IN THE PELAGIC ENVIRONMENTANDPLANKTON COMMUNITY OF LAKE VÕRTSJÄRV IN 1964–1993; pp. 40–57","authors":"P. Nõges, T. Nõges, R. Laugaste, J. Haberman, V. Kisand","doi":"10.3176/biol.ecol.1997.1/2.04","DOIUrl":"https://doi.org/10.3176/biol.ecol.1997.1/2.04","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132170373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.2004.2.03
I. V. Bovykin, G. A. Galina A. Alyabina, S. Kondratyev, I. N. Sorokin
{"title":"Total organic carbon load on the Gulf of Finland from its Russian catchment area","authors":"I. V. Bovykin, G. A. Galina A. Alyabina, S. Kondratyev, I. N. Sorokin","doi":"10.3176/biol.ecol.2004.2.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.2004.2.03","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131355295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.2006.3.04
J. Terasmaa, J. Punning
During a yearlong observation, settling fluxes of seston in the epilimnion and hypo- limnion of Lake Viitna Linajarv varied from 230 to 1400 mg m -2 d -1 . Most of the seston consisted of particulate organic matter (POM). The POM content in the dry matter of surface sediments sampled from the entire lake floor was on average over 50%. Seasonal changes in the distribution of chlorophyll a in the lake and the content of POM reveal the important role of fresh planktonic particles in the deposition. A strong correlation between POM and particulate inorganic matter in the settling matter during stratification indicates flocculent settling of the mineral particles. Resuspension from the littoral zone results in the focusing of sediment into the deep basin of the lake.
在长达一年的观测中，维纳湖表层和表层沉积物的沉降通量在230 ~ 1400 mg m -2 d -1之间变化。大部分群落由颗粒物有机质(POM)组成。全湖底表层沉积物干物质中POM含量平均在50%以上。湖泊叶绿素a分布和POM含量的季节变化揭示了新鲜浮游颗粒在沉积中的重要作用。分层过程中沉降物中POM与颗粒无机物之间的强相关性表明矿物颗粒呈絮状沉降。沿海地区的再悬浮导致沉积物集中到湖盆深处。
{"title":"Sedimentation dynamics in a small dimictic lake in northern Estonia","authors":"J. Terasmaa, J. Punning","doi":"10.3176/biol.ecol.2006.3.04","DOIUrl":"https://doi.org/10.3176/biol.ecol.2006.3.04","url":null,"abstract":"During a yearlong observation, settling fluxes of seston in the epilimnion and hypo- limnion of Lake Viitna Linajarv varied from 230 to 1400 mg m -2 d -1 . Most of the seston consisted of particulate organic matter (POM). The POM content in the dry matter of surface sediments sampled from the entire lake floor was on average over 50%. Seasonal changes in the distribution of chlorophyll a in the lake and the content of POM reveal the important role of fresh planktonic particles in the deposition. A strong correlation between POM and particulate inorganic matter in the settling matter during stratification indicates flocculent settling of the mineral particles. Resuspension from the littoral zone results in the focusing of sediment into the deep basin of the lake.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123049186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.2000.4.04
H. Voigt
{"title":"HEAVY METAL AND ORGANOCHLORINE LEVELS IN COASTAL FISHES FROM THE VÄIKE VÄIN STRAIT, WESTERN ESTONIA, IN HIGH SUMMERS OF 1993–1994; pp. 335–343","authors":"H. Voigt","doi":"10.3176/biol.ecol.2000.4.04","DOIUrl":"https://doi.org/10.3176/biol.ecol.2000.4.04","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122255012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.2003.3.12
R. Tamsalu, V. Zalesny, P. Ennet, Harri Kuosa
. The aim of this work was to introduce the last version of the hydrodynamic–ecosystem model FinEst and to supplement this model to enable its easy application for local areas. Complications in the case of local areas appear in the treatment of initial and open boundary conditions. This paper demonstrates how to handle the open boundaries and the initial data using a multi-step scheme of calculations in the Baltic Sea. First the model was applied for the entire Baltic Sea. Then the results of these calculations were used for the Gulf of Finland (GOF). Finally, calculations for some local areas in the GOF were made using the initial and open boundary conditions from the results of the GOF calculations.
{"title":"The modelling of ecosystem processes in the Gulf of Finland","authors":"R. Tamsalu, V. Zalesny, P. Ennet, Harri Kuosa","doi":"10.3176/biol.ecol.2003.3.12","DOIUrl":"https://doi.org/10.3176/biol.ecol.2003.3.12","url":null,"abstract":". The aim of this work was to introduce the last version of the hydrodynamic–ecosystem model FinEst and to supplement this model to enable its easy application for local areas. Complications in the case of local areas appear in the treatment of initial and open boundary conditions. This paper demonstrates how to handle the open boundaries and the initial data using a multi-step scheme of calculations in the Baltic Sea. First the model was applied for the entire Baltic Sea. Then the results of these calculations were used for the Gulf of Finland (GOF). Finally, calculations for some local areas in the GOF were made using the initial and open boundary conditions from the results of the GOF calculations.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123826674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.2005.2.01
V. Chekulayev, L. Chekulayeva, I. Shevchuk
{"title":"On the mechanism of the phototoxic action of haematoporphyrin derivative towards tumour cells","authors":"V. Chekulayev, L. Chekulayeva, I. Shevchuk","doi":"10.3176/biol.ecol.2005.2.01","DOIUrl":"https://doi.org/10.3176/biol.ecol.2005.2.01","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124919853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.2005.3.03
I. Lips, U. Lips, K. Kononen, A. Jaanus
. A 10-day multidisciplinary experiment with the aim to study the development of late summer phytoplankton bloom and the controlling hydrodynamic mechanisms was carried out at the entrance to the Gulf of Finland in July 1996. Clearly defined physical phenomena (cid:150) a downwelling, near-slope jets, and a mesoscale anticyclonic eddy (cid:150) were observed in the area during the study period. Due to the relatively strong currents connected to the jets and eddy periphery (current velocity up to 35 cm s (cid:150)1 ), the advection of different water masses through the sampling area gave rise to a noteworthy variability of biological parameters. However, the formation of the eddy was reflected in horizontal patterns of the patchiness of phytoplankton productivity and species composition in the upper layer. The largest value of primary production was observed in the water mass trapped inside the anticyclonic eddy. The flagellates abundance was the highest inside the eddy, while the proportion of cyanobacteria in the plankton community was the largest outside. Our conclusion is that the vertical motions associated with the mesoscale eddy and occasional mixing events on the background of low concentrations of dissolved inorganic N and P created horizontally different conditions, which favoured simultaneous development of different groups of phytoplankton in a small spatial scale.
． 1996年7月，在芬兰湾入口处进行了为期10天的多学科实验，目的是研究夏末浮游植物水华的发展及其控制水动力机制。在研究期间，在该地区观测到明显的物理现象(cid:150):下流、近坡射流和中尺度反气旋涡(cid:150)。由于与喷流和涡流外围相连的水流相对较强(流速可达35 cm s (cid:150)1)，不同水团通过采样区域的平流引起了生物参数的显著变化。而涡旋的形成则反映在上层浮游植物生产力和物种组成的斑块性水平格局上。初级产量最大的是被困在反气旋涡内的水团。涡旋内鞭毛虫丰度最高，涡旋外蓝藻所占比例最大。在低浓度溶解无机氮磷背景下，与中尺度涡旋相关的垂直运动和偶发的混合事件在水平上创造了不同的条件，有利于不同类群的浮游植物在小空间尺度上同时发育。
{"title":"The effect of hydrodynamics on the phytoplankton primary production and species composition at the entrance to the Gulf of Finland (Baltic Sea) in July 1996","authors":"I. Lips, U. Lips, K. Kononen, A. Jaanus","doi":"10.3176/biol.ecol.2005.3.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.2005.3.03","url":null,"abstract":". A 10-day multidisciplinary experiment with the aim to study the development of late summer phytoplankton bloom and the controlling hydrodynamic mechanisms was carried out at the entrance to the Gulf of Finland in July 1996. Clearly defined physical phenomena (cid:150) a downwelling, near-slope jets, and a mesoscale anticyclonic eddy (cid:150) were observed in the area during the study period. Due to the relatively strong currents connected to the jets and eddy periphery (current velocity up to 35 cm s (cid:150)1 ), the advection of different water masses through the sampling area gave rise to a noteworthy variability of biological parameters. However, the formation of the eddy was reflected in horizontal patterns of the patchiness of phytoplankton productivity and species composition in the upper layer. The largest value of primary production was observed in the water mass trapped inside the anticyclonic eddy. The flagellates abundance was the highest inside the eddy, while the proportion of cyanobacteria in the plankton community was the largest outside. Our conclusion is that the vertical motions associated with the mesoscale eddy and occasional mixing events on the background of low concentrations of dissolved inorganic N and P created horizontally different conditions, which favoured simultaneous development of different groups of phytoplankton in a small spatial scale.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122857581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.1999.1.03
Uno Veismann, T. Kutser, A. Reinart, Ants Erm, A. Herlevi, Kari Kallio
. The ST 1000 is a multipurpose fibre optic spectrometer produced by Ocean Optics Inc. It consists of three CCD array spectrometers mounted on the same electronic circuitry board and driven by the electronics ofthe main spectrometer. The spectral band of our instrument is 350-850 nm with average resolution of 0.5 nm. Light is conducted to the gratings through 2 m long fibre optics. For data acquisition a plug-in board PCMCIA card is used. Integration time, number of scans, and the interval between them can be varied by software provided by the manufacturer. We built a frame for the instrument to carry out field measurements, calibrated the measuring system, and tested the suitability of the instrument for remote sensing of aquatic environments. Comparison with airborne and shipboard remote sensing spectrometers as well as underwater spectrometer data was carried out. Our results show that the ST 1000 spectrometer can be used in remote sensing although it is designed for laboratory measurements.
． ST 1000是海洋光学公司生产的多用途光纤光谱仪。它由安装在同一电子电路板上的三台CCD阵列光谱仪组成，由主光谱仪的电子器件驱动。本仪器的光谱波段为350 ~ 850 nm，平均分辨率为0.5 nm。光通过2米长的光纤传导到光栅上。对于数据采集，使用插入板PCMCIA卡。集成时间、扫描次数和它们之间的间隔可以由制造商提供的软件来改变。搭建了现场测量框架，对测量系统进行了标定，并对仪器进行了水生环境遥感适用性测试。并与机载和舰载遥感光谱仪以及水下光谱仪数据进行了比较。我们的研究结果表明，ST 1000光谱仪虽然是为实验室测量设计的，但它可以用于遥感。
{"title":"FIELD PERFORMANCE OF THE ST 1000 SPECTROMETERIN PASSIVE OPTICAL REMOTE SENSING OF WATER BODIES","authors":"Uno Veismann, T. Kutser, A. Reinart, Ants Erm, A. Herlevi, Kari Kallio","doi":"10.3176/biol.ecol.1999.1.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.1999.1.03","url":null,"abstract":". The ST 1000 is a multipurpose fibre optic spectrometer produced by Ocean Optics Inc. It consists of three CCD array spectrometers mounted on the same electronic circuitry board and driven by the electronics ofthe main spectrometer. The spectral band of our instrument is 350-850 nm with average resolution of 0.5 nm. Light is conducted to the gratings through 2 m long fibre optics. For data acquisition a plug-in board PCMCIA card is used. Integration time, number of scans, and the interval between them can be varied by software provided by the manufacturer. We built a frame for the instrument to carry out field measurements, calibrated the measuring system, and tested the suitability of the instrument for remote sensing of aquatic environments. Comparison with airborne and shipboard remote sensing spectrometers as well as underwater spectrometer data was carried out. Our results show that the ST 1000 spectrometer can be used in remote sensing although it is designed for laboratory measurements.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121752584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.1998.3.01
L. Reintam
{"title":"DYNAMICS OF ABOVEGROUNDPHYTOMASS, NITROGEN, AND ASH ELEMENTS IN A LONG-TERM EXPERIMENT OF PEDOGENESIS","authors":"L. Reintam","doi":"10.3176/biol.ecol.1998.3.01","DOIUrl":"https://doi.org/10.3176/biol.ecol.1998.3.01","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"233-234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132617323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.2003.3.07
V. Panov, D. E. Bychenkov, N. Berezina, A. Maximov
Recent studies showed that the eastern Gulf of Finland should be considered as a "hot spot" in the Baltic Sea area, taking into account the high rate of alien species introductions, the negative environmental impacts of established alien species, and rapidly increasing export-oriented shipping. At minimum, 14 new species have established in the eastern Gulf of Finland during the last two decades, including several invasive species. Alien species are playing an important role in the structural and functional organization of communities, specifically in the littoral zone, but this role has not been fully evaluated yet. Rapid development of new ports in the eastern Gulf of Finland will result in manifold increase in the volumes of discharged ballast waters, as well as in associated risk of new invasions of harmful aquatic species in the near future. Development of effective management options to control established nuisance species and to prevent or minimize the risk of new invasions is urgently needed.
{"title":"Alien species introductions in the eastern Gulf of Finland: current state and possible management options","authors":"V. Panov, D. E. Bychenkov, N. Berezina, A. Maximov","doi":"10.3176/biol.ecol.2003.3.07","DOIUrl":"https://doi.org/10.3176/biol.ecol.2003.3.07","url":null,"abstract":"Recent studies showed that the eastern Gulf of Finland should be considered as a \"hot spot\" in the Baltic Sea area, taking into account the high rate of alien species introductions, the negative environmental impacts of established alien species, and rapidly increasing export-oriented shipping. At minimum, 14 new species have established in the eastern Gulf of Finland during the last two decades, including several invasive species. Alien species are playing an important role in the structural and functional organization of communities, specifically in the littoral zone, but this role has not been fully evaluated yet. Rapid development of new ports in the eastern Gulf of Finland will result in manifold increase in the volumes of discharged ballast waters, as well as in associated risk of new invasions of harmful aquatic species in the near future. Development of effective management options to control established nuisance species and to prevent or minimize the risk of new invasions is urgently needed.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132707289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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