Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.2003.1.03
T. Kastepõld, A. Leito, E. Mägi, T. Möls
{"title":"Autumn numbers and distribution of the staging greylag goose Anser anser in Estonia in 1990–98; pp. 26–39","authors":"T. Kastepõld, A. Leito, E. Mägi, T. Möls","doi":"10.3176/biol.ecol.2003.1.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.2003.1.03","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"355 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":"122803760","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.2005.4.04
K. Dózsa-Farkas
{"title":"Fridericia eiseni sp. n., a new enchytraeid species close to Fridericia ratzeli (Eisen, 1872)","authors":"K. Dózsa-Farkas","doi":"10.3176/biol.ecol.2005.4.04","DOIUrl":"https://doi.org/10.3176/biol.ecol.2005.4.04","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"97 2 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":"114270390","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.2000.3.05
S. Sepp, T. Nahtman, T. Möls, J. Paal
Study of the multivariate structure of the Estonian Alchemilla L. (Rosaceae) microspecies: an example of the structural indices approach.
爱沙尼亚炼金草(蔷薇科)微种的多元结构研究:结构指数方法的一个例子。
{"title":"STUDY OF THE MULTIVARIATE STRUCTURE OF THE ESTONIAN Alchemilla L. (ROSACEAE) MICROSPECIES: AN EXAMPLE OF THE STRUCTURAL INDICES APPROACH","authors":"S. Sepp, T. Nahtman, T. Möls, J. Paal","doi":"10.3176/biol.ecol.2000.3.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.2000.3.05","url":null,"abstract":"Study of the multivariate structure of the Estonian Alchemilla L. (Rosaceae) microspecies: an example of the structural indices approach.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"91 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":"124660938","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.2003.1.05
V. Chekulayev, L. Chekulayeva, I. Shevchuk
{"title":"On the mechanism of cellular death under photoexcitation of haematoporphyrin derivative","authors":"V. Chekulayev, L. Chekulayeva, I. Shevchuk","doi":"10.3176/biol.ecol.2003.1.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.2003.1.05","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"7 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":"124009301","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.2001.4.02
Ü. Suursaar, T. Kullas, M. Otsmann
Based on field measurements (1993-99) and hydrodynamic modelling the influence of currents on the ecological situation of the Vainameri is analysed and an introductory study on the resuspension is reported. 2D flow charts are presented. The Vainameri is a highly dynamic water body, where the situation is mostly determined by the water exchange processes forced by two major nearby basins (i.e., the Baltic Proper and th e Gulf of Riga) and resuspension events during storms. The hydrophysical and hydrochemical front fluctuates in N-S direction and the local conditions are frequently overrun by these excursions. Resuspension events due to currents (in the straits) and surface waves (in the shallow parts of the Vainameri) affect the study area with high turbidity and cause an about 2-3-fold increase in phosphorus concentrations. On the basis of hydrodynamic behaviour two sub-basins could be defined in the Vainameri. The eastern part has about 85% of the water exchange, lower salinity, and higher nutrient concentrations. In the western section hydrological conditions are more marine and less variable.
{"title":"THE INFLUENCE OF CURRENTS AND WAVES ON ECOLOGICAL CONDITIONS OF THE VÄINAMERI","authors":"Ü. Suursaar, T. Kullas, M. Otsmann","doi":"10.3176/biol.ecol.2001.4.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.2001.4.02","url":null,"abstract":"Based on field measurements (1993-99) and hydrodynamic modelling the influence of currents on the ecological situation of the Vainameri is analysed and an introductory study on the resuspension is reported. 2D flow charts are presented. The Vainameri is a highly dynamic water body, where the situation is mostly determined by the water exchange processes forced by two major nearby basins (i.e., the Baltic Proper and th e Gulf of Riga) and resuspension events during storms. The hydrophysical and hydrochemical front fluctuates in N-S direction and the local conditions are frequently overrun by these excursions. Resuspension events due to currents (in the straits) and surface waves (in the shallow parts of the Vainameri) affect the study area with high turbidity and cause an about 2-3-fold increase in phosphorus concentrations. On the basis of hydrodynamic behaviour two sub-basins could be defined in the Vainameri. The eastern part has about 85% of the water exchange, lower salinity, and higher nutrient concentrations. In the western section hydrological conditions are more marine and less variable.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"208 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":"123391734","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.2005.4.05
T. Timm
{"title":"On the distribution and taxonomic limits of Lumbricillus pagenstecheri (Oligochaeta, Enchytraeidae)","authors":"T. Timm","doi":"10.3176/biol.ecol.2005.4.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.2005.4.05","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"5 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":"124318066","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.2001.1.02
I. Kotta, J. Kotta
The abundance and biomass distribution of mysids were estimated on two bank slopes of the Gulf of Riga in 1977-80. The distribution of mysids was aggregated and related to the temperature conditions. Higher densities of mysids coincided with the areas where the thermocline boundaries touched the sea floor. In these biotopes with strong temperature gradients mysids were often observed outside of their natural temperature preferences. Mysis relicta was recorded above the thermocline at 10 oC and Neomysis integer below the thermocline at 2 oC.
{"title":"DISTRIBUTION OF MYSIDS ON BANK SLOPES IN THE GULF OF RIGA","authors":"I. Kotta, J. Kotta","doi":"10.3176/biol.ecol.2001.1.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.2001.1.02","url":null,"abstract":"The abundance and biomass distribution of mysids were estimated on two bank slopes of the Gulf of Riga in 1977-80. The distribution of mysids was aggregated and related to the temperature conditions. Higher densities of mysids coincided with the areas where the thermocline boundaries touched the sea floor. In these biotopes with strong temperature gradients mysids were often observed outside of their natural temperature preferences. Mysis relicta was recorded above the thermocline at 10 oC and Neomysis integer below the thermocline at 2 oC.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"4 2 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":"126315764","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.2000.1.01
J. Haberman, A. Jaani, A. Kangur, K. Kangur, R. Laugaste, A. Milius, H. Mäemets, E. Pihu
{"title":"LAKE PEIPSI AND ITS ECOSYSTEM","authors":"J. Haberman, A. Jaani, A. Kangur, K. Kangur, R. Laugaste, A. Milius, H. Mäemets, E. Pihu","doi":"10.3176/biol.ecol.2000.1.01","DOIUrl":"https://doi.org/10.3176/biol.ecol.2000.1.01","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"4 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":"128064474","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.2006.1.02
K. Rünk, M. Moora, M. Zobel
There are three congeneric fern species in Estonia that show similar morphology and ecology, but whose regional distribution is different - Dryopteris carthusiana is common, D. expansa is distributed in scattered localities, and D. dilatata is rare. We studied D. carthusiana, D. dilatata, and D. expansa in localities where all three fern species co-occur in Estonia. Our aim was to compare the population stage structure of the three species and to observe whether their population structure fluctuates differently in different sites in different years. We observed an unfavourable condition of D. expansa in one site (Saare), which we interpreted as a possible result of competitive pressure from bryophytes. Also, we observed a predomination of premature stages of D. dilatata in two sites (Janeda, Ongu), indicating the dynamic status of these populations. Because of a more westerly distribution of this species in Estonia compared to the other two, one may hypothesize that D. dilatata is able to expand its range due to climate warming.
爱沙尼亚有3种形态和生态相似但区域分布不同的同属蕨类植物——carthusiana Dryopteris常见，D. expansa分布分散，D. dilatata少见。我们研究了D. carthusiana, D. dilatata和D. expansa在爱沙尼亚所有三种蕨类植物共同出现的地方。我们的目的是比较这三个物种的种群阶段结构，并观察它们的种群结构在不同的地点和不同的年份是否有不同的波动。我们在一个地点(Saare)观察到一个不利的条件，我们认为这可能是苔藓植物竞争压力的结果。此外，我们还观察到两个地点(Janeda和Ongu)的早熟阶段的优势，表明这些种群的动态状态。由于与其他两个物种相比，该物种在爱沙尼亚的分布更偏西，人们可能会假设，由于气候变暖，D. dilatata能够扩大其范围。
{"title":"Population stage structure of three congeneric Dryopteris species in Estonia","authors":"K. Rünk, M. Moora, M. Zobel","doi":"10.3176/biol.ecol.2006.1.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.2006.1.02","url":null,"abstract":"There are three congeneric fern species in Estonia that show similar morphology and ecology, but whose regional distribution is different - Dryopteris carthusiana is common, D. expansa is distributed in scattered localities, and D. dilatata is rare. We studied D. carthusiana, D. dilatata, and D. expansa in localities where all three fern species co-occur in Estonia. Our aim was to compare the population stage structure of the three species and to observe whether their population structure fluctuates differently in different sites in different years. We observed an unfavourable condition of D. expansa in one site (Saare), which we interpreted as a possible result of competitive pressure from bryophytes. Also, we observed a predomination of premature stages of D. dilatata in two sites (Janeda, Ongu), indicating the dynamic status of these populations. Because of a more westerly distribution of this species in Estonia compared to the other two, one may hypothesize that D. dilatata is able to expand its range due to climate warming.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"107 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":"128161269","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.2005.3.02
lo Suursaar, T. Kullas, M. Otsmann
. The 3D current structure was studied in Muuga and K(cid:252)dema bays using RDCP 600 current profiler data from autumn 2003 and early summer 2004. Altogether 245 hours of flow measurements from up to nine depth layers were obtained. Despite calm weather conditions (average wind speed 3.4 m/s during the three measuring periods), the maximum horizontal current velocity reached 37 cm/s. As all the mooring sites were relatively close to the coast, downwind horizontal transport with relatively small differences over the vertical profile prevailed. The average modula of vertical velocities were between 0.47 and 0.60 cm/s, being 10(cid:150)20 times smaller than the simultaneous horizontal velocities. This may suggest that at least above sloping bottoms and within the upper 10(cid:150)20 m layer, rapid vertical spread of both hydrochemical and hydrobiological properties is hydrodynamically favoured. However, higher than expected measured vertical velocities indicate a disagreement with certain theoretical considerations. The possibility that the particles backscattering the RDCP signals were not neutrally buoyant should be investigated in detail in the future.
{"title":"Vertical structure of horizontal currents and vertical velocities observed off the Estonian coast using a recording Doppler current profiler","authors":"lo Suursaar, T. Kullas, M. Otsmann","doi":"10.3176/biol.ecol.2005.3.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.2005.3.02","url":null,"abstract":". The 3D current structure was studied in Muuga and K(cid:252)dema bays using RDCP 600 current profiler data from autumn 2003 and early summer 2004. Altogether 245 hours of flow measurements from up to nine depth layers were obtained. Despite calm weather conditions (average wind speed 3.4 m/s during the three measuring periods), the maximum horizontal current velocity reached 37 cm/s. As all the mooring sites were relatively close to the coast, downwind horizontal transport with relatively small differences over the vertical profile prevailed. The average modula of vertical velocities were between 0.47 and 0.60 cm/s, being 10(cid:150)20 times smaller than the simultaneous horizontal velocities. This may suggest that at least above sloping bottoms and within the upper 10(cid:150)20 m layer, rapid vertical spread of both hydrochemical and hydrobiological properties is hydrodynamically favoured. However, higher than expected measured vertical velocities indicate a disagreement with certain theoretical considerations. The possibility that the particles backscattering the RDCP signals were not neutrally buoyant should be investigated in detail in the future.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"96 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":"122251628","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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