Pub Date : 1900-01-01DOI: 10.3176/biol.ecol.1997.1/2.02
P. Pall
{"title":"A CLASSIFICATION OF RIVER REACHES ON THE BASIS OF WATER QUALITY WITH REFERENCE TO STREAMS OF SAAREMAA ISLAND","authors":"P. Pall","doi":"10.3176/biol.ecol.1997.1/2.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.1997.1/2.02","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"16 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":"131835207","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.2000.2.02
Kiira AAVIKSOO®, Jaanus PAALb, Tiina DISLIS®
.The experience of compiling a habitat map of the Alam-Pedja Nature Reserve, Estonia, based on integrating remote sensing (Landsat 5 TM, aerial photos), Geographic Information Systems (GIS), and national biological survey data is reported and discussed. Unsupervised and supervised classification and the maximum likelihood algorithm were used for the classification of satellite image pixels. Training polygons for justification of the classification were established after the repetitive checking of all classification units during the classification procedure. On that basis the mapping ofdifferent habitats, specific for the temperate zone and especially for Estonian nature, using a classification scheme with an emphasis on spectral separation of wetland and related forest types on satellite images was developed. The resultant map (1:50 000, Transverse Mercator Projection) includes 26 mapping units and fits rather well the Estonian habitat classification scheme. The map can be employed for land use conflict resolution, for monitoring at landscape and habitat level, as well as in biodiversity studies.
{"title":"MAPPING OF WETLAND HABITAT DIVERSITY USING SATELLITE DATA AND GIS: AN EXAMPLE FROM THE ALAM-PEDJA NATURE RESERVE, ESTONIA","authors":"Kiira AAVIKSOO®, Jaanus PAALb, Tiina DISLIS®","doi":"10.3176/biol.ecol.2000.2.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.2000.2.02","url":null,"abstract":".The experience of compiling a habitat map of the Alam-Pedja Nature Reserve, Estonia, based on integrating remote sensing (Landsat 5 TM, aerial photos), Geographic Information Systems (GIS), and national biological survey data is reported and discussed. Unsupervised and supervised classification and the maximum likelihood algorithm were used for the classification of satellite image pixels. Training polygons for justification of the classification were established after the repetitive checking of all classification units during the classification procedure. On that basis the mapping ofdifferent habitats, specific for the temperate zone and especially for Estonian nature, using a classification scheme with an emphasis on spectral separation of wetland and related forest types on satellite images was developed. The resultant map (1:50 000, Transverse Mercator Projection) includes 26 mapping units and fits rather well the Estonian habitat classification scheme. The map can be employed for land use conflict resolution, for monitoring at landscape and habitat level, as well as in biodiversity studies.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"9 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":"131847606","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.2006.4.04
T. Kutser, L. Metsamaa, E. Vahtmäe, N. Strömbeck
Optical properties of three bloom-forming cyanobacteria - Aphanizomenon flos-aquae var. baltica, Anabaena circinalis, and Nodularia spumigena - were studied in laboratory experiments. Specific absorption and backscattering coefficients of these cyanobacteria were used in an optical model to simulate water reflectance in the case of different concentrations of cyanobacteria. MODIS band 1 (620-670 nm) response to changes in the concentration of cyanobacteria was simulated from the spectral reflectance data. The results show that MODIS band 1 response to changes in the concentration of cyanobacteria is nonlinear. Band 1 response is strongest in the case of Nodularia spumigena, indicating that quantitative mapping of this species in bloom conditions is easier than in the case of the other two species of cyanobacteria investigated.
{"title":"Suitability of MODIS 250 m resolution band data for quantitative mapping of cyanobacterial blooms","authors":"T. Kutser, L. Metsamaa, E. Vahtmäe, N. Strömbeck","doi":"10.3176/biol.ecol.2006.4.04","DOIUrl":"https://doi.org/10.3176/biol.ecol.2006.4.04","url":null,"abstract":"Optical properties of three bloom-forming cyanobacteria - Aphanizomenon flos-aquae var. baltica, Anabaena circinalis, and Nodularia spumigena - were studied in laboratory experiments. Specific absorption and backscattering coefficients of these cyanobacteria were used in an optical model to simulate water reflectance in the case of different concentrations of cyanobacteria. MODIS band 1 (620-670 nm) response to changes in the concentration of cyanobacteria was simulated from the spectral reflectance data. The results show that MODIS band 1 response to changes in the concentration of cyanobacteria is nonlinear. Band 1 response is strongest in the case of Nodularia spumigena, indicating that quantitative mapping of this species in bloom conditions is easier than in the case of the other two species of cyanobacteria investigated.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"146 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":"123348515","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.2002.4.01
T. Alliksaar, T. Koff, J. Punning, J. Terasmaa
{"title":"Tracing the pathways of particles settling into a small lake","authors":"T. Alliksaar, T. Koff, J. Punning, J. Terasmaa","doi":"10.3176/biol.ecol.2002.4.01","DOIUrl":"https://doi.org/10.3176/biol.ecol.2002.4.01","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":"130820465","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.1999.2.03
A. Milius, H. Starast
{"title":"CORRELATIONS BETWEEN LIMNOLOGICAL VARIABLES OF ESTONIAN LAKES","authors":"A. Milius, H. Starast","doi":"10.3176/biol.ecol.1999.2.03","DOIUrl":"https://doi.org/10.3176/biol.ecol.1999.2.03","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"33 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":"130226613","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.2006.1.05
B. Paavel, H. Arst, A. Reinart, A. Herlevi
The reliability of the models elaborated for recreating the spectra of the light attenuation coefficient, d, , K λ on the basis of its measured values at 1-3 wavelengths was studied. The coefficients of the "one-point" (490 nm) model, elaborated earlier by A. Reinart and A. Herlevi, were tested and approved using 43 new spectra of underwater irradiance measured in 1999-2000. A new version (named C-model) allowing recreation of the spectrum of d, K λ on the basis on its measured values
研究了光衰减系数d，， K λ在1-3波长测量值基础上重建光谱的模型的可靠性。雷纳特(A. Reinart)和赫莱维(A. Herlevi)早先提出的“一点”(490 nm)模型的系数，在1999年至2000年期间用43个新的水下辐射光谱进行了测试和验证。一个新的版本(命名为c模型)允许在其测量值的基础上重建d, K λ的光谱
{"title":"Model calculations of diffuse attenuation coefficient spectra in lake waters","authors":"B. Paavel, H. Arst, A. Reinart, A. Herlevi","doi":"10.3176/biol.ecol.2006.1.05","DOIUrl":"https://doi.org/10.3176/biol.ecol.2006.1.05","url":null,"abstract":"The reliability of the models elaborated for recreating the spectra of the light attenuation coefficient, d, , K λ on the basis of its measured values at 1-3 wavelengths was studied. The coefficients of the \"one-point\" (490 nm) model, elaborated earlier by A. Reinart and A. Herlevi, were tested and approved using 43 new spectra of underwater irradiance measured in 1999-2000. A new version (named C-model) allowing recreation of the spectrum of d, K λ on the basis on its measured values","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":"114831983","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.1999.1.02
T. Kutser, K. Kallio, K. Eloheimo, Tuula Hannonen, T. Pyhalahti, S. Koponen, J. Pulliainen
. Remote sensing measurements with an airborne imaging spectrometer (AISA) were carried out on Finnish lakes and the Archipelago Sea to test the suitability of passive optical remote sensing methods for quantitative monitoring of different water properties. Eight water characteristics were under investigation: concentrations of chlorophyll a, pheophytin, suspended matter (Nuclepore and Whatman GFC filters), total phosphorus, total and dissolved organic carbon; water turbidity; and the Secchi disk depth. Over 70 retrieval variables from simple spectral ratios and their combinations to more sophisticated functions were tested. The suitability of two different spatial resolutions (20 x 20 and 100 x 100 m) was tested. Algorithms were found for quantitative estimation ofthe above-mentioned water characteristics from spectral data measured with AISA.
{"title":"QUANTITATIVE MONITORING OF WATER PROPERTIES WITH THE AIRBORNE IMAGING SPECTROMETER AISA","authors":"T. Kutser, K. Kallio, K. Eloheimo, Tuula Hannonen, T. Pyhalahti, S. Koponen, J. Pulliainen","doi":"10.3176/biol.ecol.1999.1.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.1999.1.02","url":null,"abstract":". Remote sensing measurements with an airborne imaging spectrometer (AISA) were carried out on Finnish lakes and the Archipelago Sea to test the suitability of passive optical remote sensing methods for quantitative monitoring of different water properties. Eight water characteristics were under investigation: concentrations of chlorophyll a, pheophytin, suspended matter (Nuclepore and Whatman GFC filters), total phosphorus, total and dissolved organic carbon; water turbidity; and the Secchi disk depth. Over 70 retrieval variables from simple spectral ratios and their combinations to more sophisticated functions were tested. The suitability of two different spatial resolutions (20 x 20 and 100 x 100 m) was tested. Algorithms were found for quantitative estimation ofthe above-mentioned water characteristics from spectral data measured with AISA.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"375 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":"114882848","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.2002.1.02
J. Haberman, H. Künnap
{"title":"Mean zooplankter weight as a characteristic feature of an aquatic ecosystem","authors":"J. Haberman, H. Künnap","doi":"10.3176/biol.ecol.2002.1.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.2002.1.02","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"21 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":"114698080","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.2005.2.02
G. Kobzar, V. Mardla, N. Samel
{"title":"Increase in antiplatelet effects of prostaglandins by α-tocopherol and quercetin","authors":"G. Kobzar, V. Mardla, N. Samel","doi":"10.3176/biol.ecol.2005.2.02","DOIUrl":"https://doi.org/10.3176/biol.ecol.2005.2.02","url":null,"abstract":"","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"14 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":"134151886","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.2003.3.11
T. Soomere, J. Kask
. Tallinn Bay is a semi-enclosed basin in the Gulf of Finland with a mild wave regime and an exceptionally heavy density of high speed ship traffic. Several implications resulting from the difference between the periods of wind waves (typically 3–4 s, maximum 7–8 s in extreme storms) and waves excited by fast ferries (10–15 s) are described. It is shown that ship-generated waves may play a decisive role in certain coastal processes. They cause unusually high near-bottom velocities at depths of 5–25 m. The influence of ship waves may trigger an additional sediment transport mechanism and cause considerable changes in the existing balance of sediment transport processes.
{"title":"A specific impact of waves of fast ferries on sediment transport processes in Tallinn Bay","authors":"T. Soomere, J. Kask","doi":"10.3176/biol.ecol.2003.3.11","DOIUrl":"https://doi.org/10.3176/biol.ecol.2003.3.11","url":null,"abstract":". Tallinn Bay is a semi-enclosed basin in the Gulf of Finland with a mild wave regime and an exceptionally heavy density of high speed ship traffic. Several implications resulting from the difference between the periods of wind waves (typically 3–4 s, maximum 7–8 s in extreme storms) and waves excited by fast ferries (10–15 s) are described. It is shown that ship-generated waves may play a decisive role in certain coastal processes. They cause unusually high near-bottom velocities at depths of 5–25 m. The influence of ship waves may trigger an additional sediment transport mechanism and cause considerable changes in the existing balance of sediment transport processes.","PeriodicalId":250336,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Biology. Ecology","volume":"13 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":"133990213","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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