Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.1998.4.02
T. Koff
{"title":"POLLEN INFLUX IN LAKE MATSIMÄE AND ITS CATCHMENT","authors":"T. Koff","doi":"10.3176/biol.ecol.1998.4.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.1998.4.02","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"19 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":"124300346","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.2005.4.01
J. Römbke, R. Schmelz
{"title":"New enchytraeid species since 2002","authors":"J. Römbke, R. Schmelz","doi":"10.3176/biol.ecol.2005.4.01","DOIUrl":"https://doi.org/10.3176/biol.ecol.2005.4.01","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"12 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":"114738426","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.2002.3.05
Raivo Mänd, Tiina Talvi, Annelie Ehlvest, Piret Kiristaja
. A drastic decline in land snail populations has been revealed in the oligotrophic areas of acidified regions of Europe. Since snail shells are an important calcium source for forest passerines, this decline causes severe reductions in forest passerine reproductive rates. In Estonia, about 40% of all woodlands consist of pine forests on poor, naturally acidic soils. It has been shown that birds breeding in such forests suffer calcium deficiency. A research project was carried out to estimate the current situation in Estonian forest land snail populations. This was the first large-scale quantitative investigation of forest snail fauna in the eastern Baltic area. Data about the abundance and species richness of snails are presented by geologically different regions and forest types of Estonia. The effect of industrial forest liming, occurring near some big oil-shale and cement works, was studied. Our data confirm that the number of snails in a substantial portion of Estonian forests is very low, and therefore birds breeding there may be vulnerable to possible increases in acidification. However, atmospheric pollution with calcareous materials in some ecologically problematic industrial regions seems to compensate for calcium deficiency for snail populations.
{"title":"Land snails in Estonian forests: numbers and species richness","authors":"Raivo Mänd, Tiina Talvi, Annelie Ehlvest, Piret Kiristaja","doi":"10.3176/biol.ecol.2002.3.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.2002.3.05","url":null,"abstract":". A drastic decline in land snail populations has been revealed in the oligotrophic areas of acidified regions of Europe. Since snail shells are an important calcium source for forest passerines, this decline causes severe reductions in forest passerine reproductive rates. In Estonia, about 40% of all woodlands consist of pine forests on poor, naturally acidic soils. It has been shown that birds breeding in such forests suffer calcium deficiency. A research project was carried out to estimate the current situation in Estonian forest land snail populations. This was the first large-scale quantitative investigation of forest snail fauna in the eastern Baltic area. Data about the abundance and species richness of snails are presented by geologically different regions and forest types of Estonia. The effect of industrial forest liming, occurring near some big oil-shale and cement works, was studied. Our data confirm that the number of snails in a substantial portion of Estonian forests is very low, and therefore birds breeding there may be vulnerable to possible increases in acidification. However, atmospheric pollution with calcareous materials in some ecologically problematic industrial regions seems to compensate for calcium deficiency for snail populations.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"79 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":"123427161","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.2005.1.03
K. Kangur, J. Meriluoto, L. Spoof, R. Tanner
{"title":"Hepatotoxic cyanobacterial peptides in Estonian freshwater bodies and inshore marine water","authors":"K. Kangur, J. Meriluoto, L. Spoof, R. Tanner","doi":"10.3176/biol.ecol.2005.1.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.2005.1.03","url":null,"abstract":"","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":"125938634","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.2003.4.04
Ü. Leisk, E. Loigu, P. Nõges, T. Nõges, A. Reihan, B. Skakalski
{"title":"Nutrient budget of Lake Peipsi in 1998; pp. 407–422","authors":"Ü. Leisk, E. Loigu, P. Nõges, T. Nõges, A. Reihan, B. Skakalski","doi":"10.3176/biol.ecol.2003.4.04","DOIUrl":"https://doi.org/10.3176/biol.ecol.2003.4.04","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"02 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":"129854988","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.1999.2.05
J. Virta, A. Herlevi
{"title":"CORRECTING ERRORS ASSOCIATED WITH UNDERWATER SPECTRAL IRRADIANCE MEASUREMENTS","authors":"J. Virta, A. Herlevi","doi":"10.3176/biol.ecol.1999.2.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.1999.2.05","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"160 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":"128546759","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.2001.3.03
K. Kangur, J. Haberman, A. Kangur, P. Kangur, A. Milius, H. Mäemets, R. Laugaste, E. Pihu
The investigations of the biota in L. Peipsi, one of the largest lakes of Europe, started already one and a half centuries ago, complex studies were initiated in the 1930s. The paper gives a brief survey of research into the hydrochemistry, macrophytes, bacterio-, phyto- and zooplankton, zoobenthos, fishes, and fisheries management of the lake. Special attention is paid to the main findings. Intensive anthropogenic eutrophication of L. Peipsi started in the 1970s. The nutrient content reached its maximum in the 1980s and decreased thereafter. An expansion of reeds, increase in the similarity between different lake parts, and decline of rare macrophyte species have occurred. Regarding phytoplankton, L. Pihkva has become strongly eutrophic, whereas L. Peipsi s.s. has eutrophied to a smaller extent, its northern part has maintained a mesotrophic appearance. In 1965- 99, the number but not the biomass of zooplankton increased. The number of small-sized zoo- plankters (especially rotifers) increased. No essential changes in the composition and distribution of macrozoobenthos in connection with eutrophication of the lake were observed. Dreissena polymorpha, introduced accidentally in the lake in the 1930s, has become the most significant animal population in L. Peipsi. Considering annual fish catches L. Peipsi surpasses all large lakes in North Europe. The main commercial fishes are smelt, perch, pikeperch, roach, bream, pike, and until the 1990s also vendace. At present it is changing into a smelt-bream-pikeperch lake.
欧洲最大的湖泊之一佩普西湖的生物群调查早在一个半世纪前就开始了，复杂的研究始于20世纪30年代。本文简要介绍了该湖的水化学、大型植物、细菌、植物和浮游动物、底栖动物、鱼类和渔业管理等方面的研究情况。特别注意的是主要发现。20世纪70年代开始，贝氏乳杆菌发生了强烈的人为富营养化。养分含量在20世纪80年代达到最大值，此后逐渐下降。芦苇丛扩大，湖泊各部分间相似性增加，珍稀大型植物种类减少。浮游植物方面，L. Pihkva呈强烈富营养化趋势，而L. Peipsi s.s.富营养化程度较小，其北部保持中营养化形态。1965 ~ 1999年，浮游动物的数量增加，但生物量没有增加。小型动物园浮游动物(尤其是轮虫)的数量增加了。湖泊富营养化对大型底栖动物的组成和分布没有明显影响。在20世纪30年代偶然引入湖中的多态德雷塞纳(Dreissena polymorpha)已成为贝氏湖最重要的动物种群。考虑到年捕鱼量，佩普西湖超过了北欧所有的大湖。主要的商业鱼类有臭鱼、鲈鱼、棘鱼、蟑螂、鲷鱼、梭子鱼，直到20世纪90年代也有梭子鱼。目前，它正在变成一个胡瓜鲷鱼湖。
{"title":"HISTORY OF INVESTIGATIONS ON THE ECOSYSTEM OF LAKE PEIPSI","authors":"K. Kangur, J. Haberman, A. Kangur, P. Kangur, A. Milius, H. Mäemets, R. Laugaste, E. Pihu","doi":"10.3176/biol.ecol.2001.3.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.2001.3.03","url":null,"abstract":"The investigations of the biota in L. Peipsi, one of the largest lakes of Europe, started already one and a half centuries ago, complex studies were initiated in the 1930s. The paper gives a brief survey of research into the hydrochemistry, macrophytes, bacterio-, phyto- and zooplankton, zoobenthos, fishes, and fisheries management of the lake. Special attention is paid to the main findings. Intensive anthropogenic eutrophication of L. Peipsi started in the 1970s. The nutrient content reached its maximum in the 1980s and decreased thereafter. An expansion of reeds, increase in the similarity between different lake parts, and decline of rare macrophyte species have occurred. Regarding phytoplankton, L. Pihkva has become strongly eutrophic, whereas L. Peipsi s.s. has eutrophied to a smaller extent, its northern part has maintained a mesotrophic appearance. In 1965- 99, the number but not the biomass of zooplankton increased. The number of small-sized zoo- plankters (especially rotifers) increased. No essential changes in the composition and distribution of macrozoobenthos in connection with eutrophication of the lake were observed. Dreissena polymorpha, introduced accidentally in the lake in the 1930s, has become the most significant animal population in L. Peipsi. Considering annual fish catches L. Peipsi surpasses all large lakes in North Europe. The main commercial fishes are smelt, perch, pikeperch, roach, bream, pike, and until the 1990s also vendace. At present it is changing into a smelt-bream-pikeperch lake.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"25 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":"129533822","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.2000.1.07
E. Pihu, A. Kangur
{"title":"MAIN CHANGES IN THE ICHTHYOCOENOSIS OF LAKE PEIPSI SINCE THE 1950s","authors":"E. Pihu, A. Kangur","doi":"10.3176/biol.ecol.2000.1.07","DOIUrl":"https://doi.org/10.3176/biol.ecol.2000.1.07","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":"129659984","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.2003.3.03
K. Kononen, T. Kullas, J. Laanemets, M. Lilover, A. Stips
{"title":"Late summer vertical nutrient fluxes estimated from direct turbulence measurements: a Gulf of Finland case study","authors":"K. Kononen, T. Kullas, J. Laanemets, M. Lilover, A. Stips","doi":"10.3176/biol.ecol.2003.3.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.2003.3.03","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"195 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":"132406126","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.2006.4.01
G. Angelov
Two Estonian populations of Dactylis glomerata and two of Puccinellia maritima were surveyed electrophoretically for eight enzymes to assess their diversity and affinity. Analysis of electrophoretic data indicated a significant amount of variability in the studied populations of D. glomerata and P. maritima as judged by the number of isoenzyme phenotypes and isoforms detected. Phenotypic affinity between D. glomerata and P. maritima was evaluated by calculating four coefficients of similarity/distance: SI, DCD, Ih, and DE. Phenetic analysis demonstrated that D. glomerata and P. maritima are more distantly positioned in comparison to other closely related grass species that share common genomes. Systematic position and affinity between Dactylis and Puccinellia within Poaceae are briefly discussed.
{"title":"Isoenzyme diversity and affinity between Dactylis glomerata and Puccinellia maritima (Poaceae)","authors":"G. Angelov","doi":"10.3176/biol.ecol.2006.4.01","DOIUrl":"https://doi.org/10.3176/biol.ecol.2006.4.01","url":null,"abstract":"Two Estonian populations of Dactylis glomerata and two of Puccinellia maritima were surveyed electrophoretically for eight enzymes to assess their diversity and affinity. Analysis of electrophoretic data indicated a significant amount of variability in the studied populations of D. glomerata and P. maritima as judged by the number of isoenzyme phenotypes and isoforms detected. Phenotypic affinity between D. glomerata and P. maritima was evaluated by calculating four coefficients of similarity/distance: SI, DCD, Ih, and DE. Phenetic analysis demonstrated that D. glomerata and P. maritima are more distantly positioned in comparison to other closely related grass species that share common genomes. Systematic position and affinity between Dactylis and Puccinellia within Poaceae are briefly discussed.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"23 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":"132089276","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：