Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.2003.3.05
S. Golubkov, Saara Bäck, V. N. Nikulina, Marina I. Orlova, Lydia E. Anokhina, Ludmila P. Umnova
. Ecosystem studies in the littoral zone of the Neva estuary have shown that eutrophication is a serious environmental problem for the coastal zone of the eastern part of the Gulf of Finland. It brings about an intensive development of filamentous algae Cladophora glomerata and periodical blue-green blooms. Wave action detaches Cladophora mats from substrates and causes an intensive secondary pollution of the beaches in the St. Petersburg Resort District. The zoobenthos community is dominated by caddis fly larvae in the shallow littoral. The alien species Dreissena polymorpha in deeper littoral is facilitating filamentous algae growth, clearing the water and recycling nutrients. An important recovery measure in the ecosystem management in the coastal zone is removal of hard substrates from shallow waters to curb the development of filamentous algae. Another important measure is nutrients reduction and control of the P : N ratio in the coastal zone of the Gulf of Finland.
{"title":"Effects of eutrophication and invasion of Dreissena polymorpha in the coastal zone of the eastern Gulf of Finland","authors":"S. Golubkov, Saara Bäck, V. N. Nikulina, Marina I. Orlova, Lydia E. Anokhina, Ludmila P. Umnova","doi":"10.3176/biol.ecol.2003.3.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.2003.3.05","url":null,"abstract":". Ecosystem studies in the littoral zone of the Neva estuary have shown that eutrophication is a serious environmental problem for the coastal zone of the eastern part of the Gulf of Finland. It brings about an intensive development of filamentous algae Cladophora glomerata and periodical blue-green blooms. Wave action detaches Cladophora mats from substrates and causes an intensive secondary pollution of the beaches in the St. Petersburg Resort District. The zoobenthos community is dominated by caddis fly larvae in the shallow littoral. The alien species Dreissena polymorpha in deeper littoral is facilitating filamentous algae growth, clearing the water and recycling nutrients. An important recovery measure in the ecosystem management in the coastal zone is removal of hard substrates from shallow waters to curb the development of filamentous algae. Another important measure is nutrients reduction and control of the P : N ratio in the coastal zone of the Gulf of Finland.","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":"128151463","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.2006.3.03
Tiiu Roovere, A. Lopp, T. Reintamm, A. Kuusksalu, Evelyn Richelle-Maurer, M. Kelve
Samples of freshwater sponges (Porifera, Demospongiae, Haplosclerida, suborder Spongillina) were collected at three sites in South Estonia in the Sulaoja and Vohandu rivers. A molecular approach based on the sequencing of the extended D3 domain of the 28S rDNA was used for the confirmation of the identity of sponge species. The DNA analysis showed the presence of three spongillid species in Estonia: Ephydatia fluviatilis, Ephydatia muelleri, and Spongilla lacustris. Identification of the samples by classical morphological studies of their skeleton spicules using scanning electron microscopy was performed in parallel.
{"title":"Freshwater sponges in Estonia: genetic and morphological identification","authors":"Tiiu Roovere, A. Lopp, T. Reintamm, A. Kuusksalu, Evelyn Richelle-Maurer, M. Kelve","doi":"10.3176/biol.ecol.2006.3.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.2006.3.03","url":null,"abstract":"Samples of freshwater sponges (Porifera, Demospongiae, Haplosclerida, suborder Spongillina) were collected at three sites in South Estonia in the Sulaoja and Vohandu rivers. A molecular approach based on the sequencing of the extended D3 domain of the 28S rDNA was used for the confirmation of the identity of sponge species. The DNA analysis showed the presence of three spongillid species in Estonia: Ephydatia fluviatilis, Ephydatia muelleri, and Spongilla lacustris. Identification of the samples by classical morphological studies of their skeleton spicules using scanning electron microscopy was performed in parallel.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"6 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":"128498098","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.2003.4.05
A. Leeben
{"title":"Influence of light intensity on in vivo fluorescence characteristics of cyanobacteria","authors":"A. Leeben","doi":"10.3176/biol.ecol.2003.4.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.2003.4.05","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"321 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":"134348316","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.2006.2.01
M. Mandre
Short-term effects of different doses (0.25 and 0.5 kg m -2 ) of wood ash fertilization in a field experiment in a 20-year-old Scots pine stand on a nutrient-poor sandy soil (Arenosol) was studied in North Estonia. Soil chemical properties, nutrient accumulation, soluble carbohydrates, starch, hemicellulose, cellulose, and lignin were used as biochemical indicators for the assessment of the state of trees from 2000 until 2005. Changes in the soil upper horizon (30 cm) showed an increase in the pH and in the concentrations of K, Ca, B, Mg, and other elements, except N, after treatment. Statistical relationships were found between the doses of wood ash used in the treatment and the mineral composition of the soil. Changes in soil properties brought about changes in nutrient accumulation into trees and the needle diagnosis showed an essential increase in the K, Mg, Fe, Mn, and Zn concentrations in needles. No statistically significant changes were observed in the concentrations of soluble carbohydrate (tendency to decrease), starch (tendency to increase), and structural carbohydrates, but a somewhat higher accumulation of cellulose and lignin was registered in the needles of Scots pine. The effect of wood ash on carbohydrate metabolism and lignin synthesis seemed to depend on the seasonal development stage of needles and climatic conditions.
在爱沙尼亚北部营养贫乏的沙质土壤(Arenosol)上，对一个20年的苏格兰松林进行了田间试验，研究了不同剂量(0.25和0.5 kg m -2)木灰施肥的短期效应。2000 - 2005年以土壤化学性质、养分积累、可溶性碳水化合物、淀粉、半纤维素、纤维素和木质素为生化指标评价树木的生长状况。土壤表层(30 cm)的变化表明，处理后土壤pH升高，K、Ca、B、Mg和除N外的其他元素的浓度升高。在处理中使用的木灰剂量与土壤的矿物组成之间发现了统计关系。土壤性质的变化导致树木养分积累的变化，针叶诊断显示针叶中K、Mg、Fe、Mn和Zn的含量显著增加。可溶性碳水化合物(有减少趋势)、淀粉(有增加趋势)和结构性碳水化合物的浓度没有统计学上的显著变化，但苏格兰松针中纤维素和木质素的积累有所增加。木灰对碳水化合物代谢和木质素合成的影响似乎取决于针叶的季节发育阶段和气候条件。
{"title":"Influence of wood ash on soil chemical composition and biochemical parameters of young Scots pine","authors":"M. Mandre","doi":"10.3176/biol.ecol.2006.2.01","DOIUrl":"https://doi.org/10.3176/biol.ecol.2006.2.01","url":null,"abstract":"Short-term effects of different doses (0.25 and 0.5 kg m -2 ) of wood ash fertilization in a field experiment in a 20-year-old Scots pine stand on a nutrient-poor sandy soil (Arenosol) was studied in North Estonia. Soil chemical properties, nutrient accumulation, soluble carbohydrates, starch, hemicellulose, cellulose, and lignin were used as biochemical indicators for the assessment of the state of trees from 2000 until 2005. Changes in the soil upper horizon (30 cm) showed an increase in the pH and in the concentrations of K, Ca, B, Mg, and other elements, except N, after treatment. Statistical relationships were found between the doses of wood ash used in the treatment and the mineral composition of the soil. Changes in soil properties brought about changes in nutrient accumulation into trees and the needle diagnosis showed an essential increase in the K, Mg, Fe, Mn, and Zn concentrations in needles. No statistically significant changes were observed in the concentrations of soluble carbohydrate (tendency to decrease), starch (tendency to increase), and structural carbohydrates, but a somewhat higher accumulation of cellulose and lignin was registered in the needles of Scots pine. The effect of wood ash on carbohydrate metabolism and lignin synthesis seemed to depend on the seasonal development stage of needles and climatic conditions.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"8 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":"133083709","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.2002.3.04
T. Timm
{"title":"Meiobenthos in some Estonian small stratified lakes","authors":"T. Timm","doi":"10.3176/biol.ecol.2002.3.04","DOIUrl":"https://doi.org/10.3176/biol.ecol.2002.3.04","url":null,"abstract":"","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":"131748690","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.2001.3.05
V. Panov, S. Golubkov, M. Orlova
The history of littoral zone research in the Neva estuary, the largest estuary in the Baltic Sea, is described. Environmental problems, including effects of eutrophication and introductions of alien species, are discussed. A brief outline of future research is provided. The Neva estuary is the largest estuary in the Baltic Sea, located in the eastern Gulf of Finland. It has sustained a heavy impact from human activities, including discharges of treated and untreated wastewaters from point sources in St. Petersburg and intensive ship traffic. The Neva estuary consists of three main parts: Neva Bay (surface area 400 km 2 ), and the inner and outer estuaries (total surface area of the last two parts about 3200 km 2 ) (Pitkanen, 1991). Since the early 1980s freshwater Neva Bay has been separated from the brackish lower reaches of the estuary by a storm-surge barrier, which is still under construction (Fig. 1). The coastal zone of the estuary is intensively exploited for recreation (specifically in the Resort District of St. Petersburg), sport and commercial fishing, military purposes, and various industrial uses including nuclear power and shipping. The coastal zone also receives discharges of treated and untreated wastewaters, occurring mainly in the lower Neva River and in Neva Bay. Heavy nutrient loading (eutrophication), mainly from point sources in the Neva River and the upper estuary, is currently the most serious environmental problem for the Neva estuary and adjacent parts of the eastern Gulf of Finland (Alimov et al., 1996; Leppanen et al., 1997). The introduction of alien species is an emerging issue for the Neva estuary (Alimov et al., 1998; Orlova et al., 1999b; Panov et al.,
介绍了波罗的海最大的河口涅瓦河河口沿岸带研究的历史。讨论了环境问题，包括富营养化的影响和外来物种的引入。对今后的研究作了简要概述。涅瓦河河口是波罗的海最大的河口，位于芬兰湾东部。它受到人类活动的严重影响，包括从圣彼得堡的点源排放经过处理和未经处理的废水以及密集的船舶交通。涅瓦河河口由三个主要部分组成:涅瓦湾(面积400平方公里)和内外河口(后两个部分的总面积约3200平方公里)(Pitkanen, 1991)。自20世纪80年代初以来，淡水的涅瓦湾已经被一个仍在建设中的风暴潮屏障与河口的咸淡水下游分开(图1)。河口的沿海地区被集中开发用于娱乐(特别是在圣彼得堡的度假区)，体育和商业捕鱼，军事目的，以及各种工业用途，包括核电和航运。沿海地区还排放经过处理和未经处理的废水，主要发生在涅瓦河下游和涅瓦湾。主要来自涅瓦河和河口上游点源的重营养负荷(富营养化)是目前涅瓦河河口和芬兰湾东部邻近地区最严重的环境问题(Alimov et al.， 1996;Leppanen et al.， 1997)。外来物种的引入是涅瓦河河口的一个新问题(Alimov et al.， 1998;Orlova et al.， 1999;Panov等人，
{"title":"LITTORAL ZONE RESEARCH IN THE NEVA ESTUARY (EASTERN GULF OF FINLAND): HISTORY AND PERSPECTIVES","authors":"V. Panov, S. Golubkov, M. Orlova","doi":"10.3176/biol.ecol.2001.3.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.2001.3.05","url":null,"abstract":"The history of littoral zone research in the Neva estuary, the largest estuary in the Baltic Sea, is described. Environmental problems, including effects of eutrophication and introductions of alien species, are discussed. A brief outline of future research is provided. The Neva estuary is the largest estuary in the Baltic Sea, located in the eastern Gulf of Finland. It has sustained a heavy impact from human activities, including discharges of treated and untreated wastewaters from point sources in St. Petersburg and intensive ship traffic. The Neva estuary consists of three main parts: Neva Bay (surface area 400 km 2 ), and the inner and outer estuaries (total surface area of the last two parts about 3200 km 2 ) (Pitkanen, 1991). Since the early 1980s freshwater Neva Bay has been separated from the brackish lower reaches of the estuary by a storm-surge barrier, which is still under construction (Fig. 1). The coastal zone of the estuary is intensively exploited for recreation (specifically in the Resort District of St. Petersburg), sport and commercial fishing, military purposes, and various industrial uses including nuclear power and shipping. The coastal zone also receives discharges of treated and untreated wastewaters, occurring mainly in the lower Neva River and in Neva Bay. Heavy nutrient loading (eutrophication), mainly from point sources in the Neva River and the upper estuary, is currently the most serious environmental problem for the Neva estuary and adjacent parts of the eastern Gulf of Finland (Alimov et al., 1996; Leppanen et al., 1997). The introduction of alien species is an emerging issue for the Neva estuary (Alimov et al., 1998; Orlova et al., 1999b; Panov et al.,","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"44 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":"133914850","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.2004.3.04
O. Roots, V. Žitko
{"title":"Health concerns in the Baltic States, Nordic countries, and Russia","authors":"O. Roots, V. Žitko","doi":"10.3176/biol.ecol.2004.3.04","DOIUrl":"https://doi.org/10.3176/biol.ecol.2004.3.04","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"32 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":"123899432","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.2006.2.03
M. Mandre, R. Korsjukov
Sandy soil in a tree nursery was treated with wood ash (0.25, 0.5, or 1.0 kg m -2 , untreated for control). The influence of different treatments on the carbohydrate concentration and dynamics in needles was estimated. The increase in the pH of soil due to wood ash application correlated with the reduction in the needle hexoses (glucose and fructose). The ratio of fructose to glucose in treated trees often exceeded 2-3 times the respective hexose ratio in untreated trees. The sucrose concentration was not significantly influenced by the soil pH and wood ash. The starch concentration tended to be smaller in treated trees. The results suggest that carbohydrate reserves in needles could be reduced by wood ash during the growing period. The accumulation of soluble carbohydrates by winter did not depend on the treatment.
苗圃的沙质土壤用木灰处理(0.25、0.5或1.0 kg m -2，对照未处理)。评价了不同处理对针叶碳水化合物浓度和动态的影响。施用木灰引起的土壤pH值升高与针状己糖(葡萄糖和果糖)的减少有关。处理过的树木中果糖与葡萄糖的比例通常超过未处理树木中各自己糖比例的2-3倍。土壤pH和木灰对蔗糖浓度影响不显著。淀粉浓度在处理过的树木中有变小的趋势。结果表明，生长期木灰可降低针叶碳水化合物储量。冬季可溶性碳水化合物的积累不依赖于处理。
{"title":"Needle carbohydrate concentrations in Norway spruce as affected by wood ash application to soil","authors":"M. Mandre, R. Korsjukov","doi":"10.3176/biol.ecol.2006.2.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.2006.2.03","url":null,"abstract":"Sandy soil in a tree nursery was treated with wood ash (0.25, 0.5, or 1.0 kg m -2 , untreated for control). The influence of different treatments on the carbohydrate concentration and dynamics in needles was estimated. The increase in the pH of soil due to wood ash application correlated with the reduction in the needle hexoses (glucose and fructose). The ratio of fructose to glucose in treated trees often exceeded 2-3 times the respective hexose ratio in untreated trees. The sucrose concentration was not significantly influenced by the soil pH and wood ash. The starch concentration tended to be smaller in treated trees. The results suggest that carbohydrate reserves in needles could be reduced by wood ash during the growing period. The accumulation of soluble carbohydrates by winter did not depend on the treatment.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"127 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":"127945472","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.2001.3.02
A. Järvekülg, K. Piirsoo, V. Porgasaar, T. Trei, M. Viik, S. Vilbaste
{"title":"INVESTIGATIONS ON THE BALTIC SEA CONDUCTED BY THE DEPARTMENT OF MARINE BIOLOGY, INSTITUTE OF ZOOLOGY AND BOTANY (TARTU, ESTONIA), 1975–90; pp. 158–168","authors":"A. Järvekülg, K. Piirsoo, V. Porgasaar, T. Trei, M. Viik, S. Vilbaste","doi":"10.3176/biol.ecol.2001.3.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.2001.3.02","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"128 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":"121225473","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.1998.1.05
L. Truus
. The practice of cutting and grazing seminatural meadows is diminishing in Estonia like in the rest of Europe. As a result, plant species diversity is decreasing and species composition is changing on these meadows. The extent and speed of changes depend greatly on the ecological conditions of the habitats. The influence of management cessation on reedbed, floodplain marsh, and floodplain meadow vegetation was analysed on a landscape transect in the Kloostri floodplain, West Estonia. The above-ground biomass and litter were measured in 20 sample plots along the landscape transect in 1996. The species composition and cover data were compared with those estimated nine years earlier, in 1987, when the area was still under management. Above-ground biomass of reedbed was 1900-2100 g/m?, which coincides well with the earlier data. The biomass of floodplain meadow communities was 300-800 g/m’. Litter was abundant and in most floodplain meadow communities its amount was higher than that of biomass. Using Ward’s method of the coefficient of squared Euclidean distance for ordination of the species cover data from 1987 and 1996, it was found that the vegetation of drier sites (on higher elevations) had changed most notably while there were no changes in the sample plots of reedbed. The species composition of floodplain communities had changed a little; a few species common for pastures had disappeared. Differences between plant communities had decreased, vegetation had become more uniform. The dominance of tall grasses and sedges had increased.
{"title":"INFLUENCE OF MANAGEMENT CESSATION ON REEDBED AND FLOODPLAIN VEGETATION ON THE KLOOSTRI FLOODPLAIN MEADOW IN THE DELTA OF THE KASARI RIVER, ESTONIA","authors":"L. Truus","doi":"10.3176/biol.ecol.1998.1.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.1998.1.05","url":null,"abstract":". The practice of cutting and grazing seminatural meadows is diminishing in Estonia like in the rest of Europe. As a result, plant species diversity is decreasing and species composition is changing on these meadows. The extent and speed of changes depend greatly on the ecological conditions of the habitats. The influence of management cessation on reedbed, floodplain marsh, and floodplain meadow vegetation was analysed on a landscape transect in the Kloostri floodplain, West Estonia. The above-ground biomass and litter were measured in 20 sample plots along the landscape transect in 1996. The species composition and cover data were compared with those estimated nine years earlier, in 1987, when the area was still under management. Above-ground biomass of reedbed was 1900-2100 g/m?, which coincides well with the earlier data. The biomass of floodplain meadow communities was 300-800 g/m’. Litter was abundant and in most floodplain meadow communities its amount was higher than that of biomass. Using Ward’s method of the coefficient of squared Euclidean distance for ordination of the species cover data from 1987 and 1996, it was found that the vegetation of drier sites (on higher elevations) had changed most notably while there were no changes in the sample plots of reedbed. The species composition of floodplain communities had changed a little; a few species common for pastures had disappeared. Differences between plant communities had decreased, vegetation had become more uniform. The dominance of tall grasses and sedges had increased.","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":"121314597","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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