Sirvi Autor "Panksep, Kristel" järgi
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Kirje Boosting the monitoring of phytoplankton in optically complex coastal waters by combining pigment-based chemotaxonomy and in situ radiometry(Elsevier, 2019) Tamm, Marju; Ligi, Martin; Panksep, Kristel; Teeveer, Karolin; Freiberg, Rene; Laas, Peeter; Paavel, Birgot; Kutser, Tiit; Reinart, Anu; Tõnno, Ilmar; Nõges, Tiina; Chair of Hydrobiology and Fishery. Institute of Agricultural and Environmental SciencesResearch about the occurrence and extent of the cyanobacterial blooms in the Baltic Sea is critical due to their increased magnitude and frequency. Monitoring of the blooms is complicated due to their spatially and tem- porally heterogeneous nature. For adequate assessment of the water quality, phytoplankton dynamics needs to be tracked in large areas with high monitoring frequency. The main objectives of this study were (1) to describe phytoplankton community composition by pigment-based chemotaxonomy and validate the results with mi- croscopy; (2) to improve the retrieval of information about phytoplankton community by combining remote sensing with laboratory based approaches (3) to develop a region-specific algorithm to calculate cyanobacteria biomass from reflectance spectra; (4) to detect and quantify potentially toxic bloom-forming cyanobacteria with molecular methods. In our study the reflectance-based chlorophyll a (Chl a) values overestimated the High- performance Liquid Chromatography (HPLC) values although the correlations with HPLC Chl a measurements were very strong (rp ∼ 0.8, p < 0.001). We found that 709 nm/620 nm reflectance ratio correlated strongly (rp = 0.75, p < 0.01) to cyanobacteria wet biomass in CDOM-rich Väinameri even at low cyanobacterial bio- mass levels. Correlations between pigment-based chemotaxonomy and microscopy were significant in case of cyanobacteria (rp = 0.73, p < 0.01), cryptophytes (rp = 0.71, p < 0.05) and dinoflagellates (rp = 0.64, p < 0.05).Kirje Data Descriptor : A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins(Springer Nature, 2018) Mantzouki, Evanthia; Campbell, James; Van Loon, Emiel; Visser, Petra; Konstantinou, Iosif; Antoniou, Maria; Giuliani, Grégory; Machado-Vieira, Danielle; Gurjão de Oliveira, Alinne; Maronić, Dubravka Špoljarić; Stević, Filip; Pfeiffer, Tanja Žuna; Vucelić, Itana Bokan; Žutinić, Petar; Udovič, Marija Gligora; Plenković-Moraj, Anđelka; Tsiarta, Nikoletta; Bláha, Luděk; Geriš, Rodan; Fránková, Markéta; Christoffersen, Kirsten Seestern; Warming, Trine Perlt; Feldmann, Tõnu; Laas, Alo; Panksep, Kristel; Tuvikene, Lea; Kangro, Kersti; Häggqvist, Kerstin; Salmi, Pauliina; Arvola, Lauri; Fastner, Jutta; Straile, Dietmar; Rothhaupt, Karl-Otto; Fonvielle, Jeremy; Grossart, Hans-Peter; Avagianos, Christos; Kaloudis, Triantafyllos; Triantis, Theodoros; Zervou, Sevasti-Kiriaki; Hiskia, Anastasia; Gkelis, Spyros; Panou, Manthos; McCarthy, Valerie; Perello, Victor C.; Obertegger, Ulrike; Boscaini, Adriano; Flaim, Giovanna; Salmaso, Nico; Cerasino, Leonardo; Koreivienė, Judita; Karosienė, Jūratė; Kasperovičienė, Jūratė; Savadova, Ksenija; Vitonytė, Irma; Haande, Sigrid; Skjelbred, Birger; Grabowska, Magdalena; Karpowicz, Maciej; Chmura, Damian; Nawrocka, Lidia; Kobos, Justyna; Mazur-Marzec, Hanna; Alcaraz-Párraga, Pablo; Wilk-Woźniak, Elżbieta; Krztoń, Wojciech; Walusiak, Edward; Gagala, Ilona; Mankiewicz-Boczek, Joana; Toporowska, Magdalena; Pawlik-Skowronska, Barbara; Niedźwiecki, Michał; Pęczuła, Wojciech; Napiórkowska-Krzebietke, Agnieszka; Dunalska, Julita; Sieńska, Justyna; Szymański, Daniel; Kruk, Marek; Budzyńska, Agnieszka; Goldyn, Ryszard; Kozak, Anna; Rosińska, Joanna; Szeląg-Wasielewska, Elżbieta; Domek, Piotr; Jakubowska-Krepska, Natalia; Kwasizur, Kinga; Messyasz, Beata; Pełechata, Aleksandra; Pełechaty, Mariusz; Kokocinski, Mikolaj; Madrecka, Beata; Kostrzewska-Szlakowska, Iwona; Frąk, Magdalena; Bańkowska-Sobczak, Agnieszka; Wasilewicz, Michał; Ochocka, Agnieszka; Pasztaleniec, Agnieszka; Jasser, Iwona; Antão-Geraldes, Ana M.; Leira, Manel; Hernández, Armand; Vasconcelos, Vitor; Morais, João; Vale, Micaela; Raposeiro, Pedro M.; Gonçalves, Vítor; Aleksovski, Boris; Krstić, Svetislav; Nemova, Hana; Drastichova, Iveta; Chomova, Lucia; Remec-Rekar, Spela; Elersek, Tina; Delgado-Martín, Jordi; García, David; Cereijo, Jose Luís; Gomà, Joan; Trapote, Mari Carmen; Vegas-Vilarrúbia, Teresa; Obrador, Biel; García-Murcia, Ana; Real, Monserrat; Romans, Elvira; Noguero-Ribes, Jordi; Duque, David Parreño; Fernández-Morán, Elísabeth; Úbeda, Bárbara; Gálvez, José Ángel; Marcé, Rafael; Catalán, Núria; Pérez-Martínez, Carmen; Ramos-Rodríguez, Eloísa; Cillero-Castro, Carmen; Moreno-Ostos, Enrique; Blanco, José María; Rodríguez, Valeriano; Montes-Pérez, Jorge Juan; Palomino, Roberto L.; Rodríguez-Pérez, Estela; Carballeira, Rafael; Camacho, Antonio; Picazo, Antonio; Rochera, Carlos; Santamans, Anna C.; Ferriol, Carmen; Romo, Susana; Soria, Juan Miguel; Hansson, Lars-Anders; Urrutia-Cordero, Pablo; Özen, Arda; Bravo, Andrea G.; Buck, Moritz; Colom-Montero, William; Mustonen, Kristiina; Pierson, Don; Yang, Yang; M. H. Verspagen, Jolanda; De Senerpont Domis, Lisette N.; Seelen, Laura; Teurlincx, Sven; Verstijnen, Yvon; Lürling, Miquel; Maliaka, Valentini; Faassen, Elisabeth J.; Latour, Delphine; Carey, Cayelan C.; W. Paerl, Hans; Torokne, Andrea; Karan, Tünay; Demir, Nilsun; Beklioğlu, Meryem; Filiz, Nur; E. Levi, Eti; Iskin, Uğur; Bezirci, Gizem; Tavşanoğlu, Ülkü Nihan; Çelik, Kemal; Özhan, Koray; Karakaya, Nusret; Koçer, Mehmet Ali Turan; Yilmaz, Mete; Maraşlıoğlu, Faruk; Fakioglu, Özden; Soylu, Elif Neyran; Yağcı, Meral Apaydın; Çınar, Şakir; Çapkın, Kadir; Yağcı, Abdulkadir; Cesur, Mehmet; Bilgin, Fuat; Bulut, Cafer; Uysal, Rahmi; Köker, Latife; Akçaalan, Reyhan; Albay, Meriç; Alp, Mehmet Tahir; Özkan, Korhan; Sevindik, Tuğba Ongun; Tunca, Hatice; Önem, Burçin; Richardson, Jessica; Edwards, Christine; Bergkemper, Victoria; O'Leary, Sarah; Beirne, Eilish; Cromie, Hannah; Ibelings, Bastiaan W.; Institute of Agricultural and Environmental SciencesUnder ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment.Kirje From microscopy to genes – tracing toxic cyanobacteria in a shallow eutrophic lake(Estonian University of Life Sciences, 2022) Panksep, Kristel; Kisand, Veljo (advisor); Agasild, Helen (advisor); Sivonen, Kaarina (advisor); Institute of Agricultural and Environmental Sciences; Vasas, Gabor (opponent)Global warming paired with eutrophication processes is shifting phytoplankton communities towards the dominance of bloom-forming and potentially toxic cyanobacteria. Cyanobacterial blooms are considered an increasing threat in freshwater. Traditional monitoring predominantly relies on cyanobacterial biomass as an indicator of potential toxin presence, disregarding that toxin concentrations can rapidly increase even when cyanobacterial biomass is low. The concentration of toxins in the water is related to the abundance of toxin-producing species and the amount of toxin per cell – toxin quota. My research provides valuable information about the cyanobacterial community composition, the abundance of toxic genotypes, microcystin concentrations, microcystin quota and the environmental factors that promote toxic cyanobacterial blooms in the large and shallow freshwater lake Peipsi. This is the first study to utilise molecular methods as complementary to routine monitoring to determine cyanobacterial toxicity potential in lake Peipsi. In situ studies on zooplankton taxon-specific ingestion of potentially toxic cyanobacteria are still limited. My study focused on the importance of cyanobacteria as a food source for the dominant crustacean grazers. Among the first studies using qPCR targeting cyanobacterial genus-specific mcyE synthase genes in zooplankton gut content analysis, we show that potentially toxic strains of Microcystis can be ingested directly or indirectly by different zooplankton grazers. Information gathered from this study expanded our knowledge on the ecology of toxic cyanobacteria, provided an indication of how molecular methods can improve traditional risk assessment concerning the abundance of cyanobacteria and their cyanotoxins and broadened our knowledge of how target specific molecular tools could be further used in aquatic food-web studies. In the current thesis, I present a synthesis of spatial and temporal variability of potentially toxic cyanobacteria and the importance of cyanobacteria as a food source for crustacean zooplankton in large and shallow lake. The thesis is based on three published papers each dedicated to a different aspect of the whole. This thesis improves our knowledge of potentially toxic cyanobacteria and cyanotoxins in large and shallow eutrophic lakes and also provides the first insight into the in-situ consumption of toxic Microcystis by cladoceran and copepod grazers dominating in the lake. The knowledge gained from this study will guide us to further important questions that should be addressed in future research regarding the functioning of the food web of lake Peipsi. Phytoplankton community through high throughput sequencing would allow analysing the relation of cyanobacterial community composition along with concentration and diversity of cyanotoxins. This would include small-sized cyanobacteria in analysis, which are now excluded from the research. To elucidate the processes underlying cyanotoxin dynamics in more detail, further exploration focusing on the expression of toxin genes along with toxin concentration would be beneficial. Toxin gene expression could better indicate potential risks, especially in water bodies comprising mixed assemblages of toxic and non-toxic cyanobacteria.Kirje From microscopy to genes – tracing toxic cyanobacteria in a shallow eutrophic lake(Estonian University of Life Sciences, 2022) Panksep, Kristel; Kisand, Veljo; Agasild, Helen; Sivonen, Kaarina; Institute of Agricultural and Environmental Sciences; Vasas, Gabor (opponent)Global warming paired with eutrophication processes is shifting phytoplankton communities towards the dominance of bloom-forming and potentially toxic cyanobacteria. Cyanobacterial blooms are considered an increasing threat in freshwater. Traditional monitoring predominantly relies on cyanobacterial biomass as an indicator of potential toxin presence, disregarding that toxin concentrations can rapidly increase even when cyanobacterial biomass is low. The concentration of toxins in the water is related to the abundance of toxin-producing species and the amount of toxin per cell – toxin quota. My research provides valuable information about the cyanobacterial community composition, the abundance of toxic genotypes, microcystin concentrations, microcystin quota and the environmental factors that promote toxic cyanobacterial blooms in the large and shallow freshwater lake Peipsi. This is the first study to utilise molecular methods as complementary to routine monitoring to determine cyanobacterial toxicity potential in lake Peipsi. In situ studies on zooplankton taxon-specific ingestion of potentially toxic cyanobacteria are still limited. My study focused on the importance of cyanobacteria as a food source for the dominant crustacean grazers. Among the first studies using qPCR targeting cyanobacterial genus-specific mcyE synthase genes in zooplankton gut content analysis, we show that potentially toxic strains of Microcystis can be ingested directly or indirectly by different zooplankton grazers. Information gathered from this study expanded our knowledge on the ecology of toxic cyanobacteria, provided an indication of how molecular methods can improve traditional risk assessment concerning the abundance of cyanobacteria and their cyanotoxins and broadened our knowledge of how target specific molecular tools could be further used in aquatic food-web studies. In the current thesis, I present a synthesis of spatial and temporal variability of potentially toxic cyanobacteria and the importance of cyanobacteria as a food source for crustacean zooplankton in large and shallow lake. The thesis is based on three published papers each dedicated to a different aspect of the whole. This thesis improves our knowledge of potentially toxic cyanobacteria and cyanotoxins in large and shallow eutrophic lakes and also provides the first insight into the in-situ consumption of toxic Microcystis by cladoceran and copepod grazers dominating in the lake. The knowledge gained from this study will guide us to further important questions that should be addressed in future research regarding the functioning of the food web of lake Peipsi. Phytoplankton community through high throughput sequencing would allow analysing the relation of cyanobacterial community composition along with concentration and diversity of cyanotoxins. This would include small-sized cyanobacteria in analysis, which are now excluded from the research. To elucidate the processes underlying cyanotoxin dynamics in more detail, further exploration focusing on the expression of toxin genes along with toxin concentration would be beneficial. Toxin gene expression could better indicate potential risks, especially in water bodies comprising mixed assemblages of toxic and non-toxic cyanobacteria.Kirje Järvede tervendamine. Kogumik(2011) Kõiv, Toomas; Ott, Ingmar; Tuvikene, Lea; Sarik, Diana; Panksep, Kristel; Pedusaar, Tiia; Järvalt, Ain; Tuvikene, Arvo; Mäemets, Helle; Timm, Henn; Kisand, Anu; Mugra, Tõnu; Laanetu, Nikolai; Tupits, Ilmar; Laas, Alo; Sammalkorpi, Ilkka; Hamilton, David P.; Eesti Maaülikool. Põllumajandus- ja keskkonnainstituut. LimnoloogiakeskusEessõna järvede tervendamise käsiraamatule Kui veel 1950 – 60-ndatel aastatel võis enamiku Eesti järvede seisundit pidada looduslikuks, siis 21. sajandi alguseks on paljude järvede seisund peamiselt tugeva inimmõju tagajärjel märkimisväärselt halvenenud. Hinnanguliselt 10 – 12% meie järvedest on halvas seisundiklassis ja vajaks kindlasti tervendamist. Lisaks on veel palju järvi , mille seisund ei ole küll päris halb, aga vajab siiski parandamist. Euroopa Liidus 2000. aastal rakendunud veepoliitika raamdirektiiv seab eesmärgiks saavutada aastaks 2015 liikmesriikide kõigi vete, sh pinnavee, põhjavee, reovee ja joogivee, hea seisund. Pinnaveekogudes tuleb lisaks vee heale keemilisele seisundile saavutada ka hea ökoloogiline seisund. Kui veekogu seisund pole hinnatud heaks või väga heaks, tuleb kasutusele võtta meetmed vähemalt hea seisundi saavutamiseks. Selleks võib olla piisav veekogu majandamise ümberkorraldamine, kuid enamasti tähendab see vajadust astuda konkreetseid samme valgalalt saabuva reostuskoormuse vähendamiseks ja ka veekogu enese tervendamiseks. Järvede kui suure loodusväärtuse hea seisund on oluline ka inimese tervise seisukohast. Terved ja kaunid järved pakuvad puhkamiseks ja töövõime taastamiseks mitmekülgseid võimalusi, mille hulgas on kalastamine kindlasti üks märkimisväärsemaid. Keskkonnaministeeriumi korraldatud küsitlusel harrastuspüüdjate seas selgus, et enim häirivad hobikalureid veekogudele ligipääsu puudumine ja väike vääriskalavaru, kuid ka veekogude halb olukord ja üldine kala vähesus. Tervendamine võimaldab lisaks järvede olukorra parandamisele tervikuna taastada või tõsta ka nende kalamajanduslikku väärtust. Nagu igal elualal, on ka järvede tervendamise alases sõnavaras kasutusel palju sama või osaliselt kattuva tähendusega mõisteid. Levinuim vaste järvede tervendamisele on olnud „restaureerimine” , mis on eesti keelde tulnud ingliskeelsest mõistest restoration , otsetõlkena on palju kasutatud ka „taastamist”. Võõrsõna ja selle sisult ebatäpsete eestikeelsete vastete asemel on järveteadlased üsna edukalt suutnud juurutada hoopis kodusema kõlaga ja pehmema sisuga mõistet „tervendamine”. Käsiraamatu esimeses peatükis soovitatakse tervendamise terminoloogiat vastavalt sellele, kui põhjalikku sekkumist on järve seisundi parandamiseks vaja. Seal leiab käsitlemist tervendamise kitsam tähendus. Nii selle käsiraamatu pealkirjas kui tekstis kasutame enamasti seda mõistet laiemas tähenduses, mis hõlmab kõiki järvede olukorra parandamisega seotud tegevusi ja viise olenemata sellest, kui põhjalikke muutusi läbi viiakse. Eestis jõudsalt hoogu koguv järvede tervendamine on seni põhinenud üsna lünklikel ja juhuslikel teadmistel, kuna meil on puudunud seda teemat tervikuna ja põhjalikult käsitlev eestikeelne kirjandus. Heal juhul on järvede tervendajad leidnud üles järveteadlased ja lasknud enne järve kallale asumist teha uuringud, saamaks teada, mis on järve seisundi halvenemise tegelikud põhjused. Keskkonnainvesteeringute Keskuse toel Eesti Maaülikoolis valminud artiklite kogum on „Järvede tervendamise käsiraamatu” käsikiri, mis vajab enne päris raamatuks saamist veel toimetamist. Kuna vajadus sellise juhend- ja õppematerjali järele on suur, siis on käsikirjalised artiklid juba avalikult kättesaadavaks tehtud. Esimene peatükk tutvustab järveteaduse ehk limnoloogia aluseid, mis aitavad mõista järvede tervendamise põhimõtteid. Teises peatükis antakse ülevaade Eesti järvede tervendamisvajadusest. Kolmas peatükk käsitleb kogu tervendamisega kaasnevat protsessi, alates idee tekkimisest ja asja kohasest seadusandlusest ning lõpetades järelseirega. Järgnevad peatükid käsitlevad tervendamise meetodeid: biomanipulatsioon (peatükk 4), vee hapnikuga rikastamine (peatükk 5) , veerežiimi muutmine (peatükk 6) , makrofüüdijärvede tervendamine (peatükk 7), vee ja setete keemilise töötlemise meetodid (peatükk 8) ja setete eemaldamine (peatükk 9). Peatükk 10 tutvustab järve veetaseme tõstmise ja sette eemaldamise ehitusprojektidega seonduvat. Peatükis 11 leiavad käsitlemist keskkonnamõjude hindamine ja järvede hooldus. Kuigi näiteid järvede tervendamisest leidub igas konkreetseid meetodeid käsitlevas peatükis, annab viimane, 12. peatükk veel ülevaate veekogude tervendamise senistest kogemustest Eestis ja mujal Euroopas ning kirjeldab põhjalikumalt mõnd huvitavamat tervendamise näidet nii meilt kui mujalt maa ilmast. Käsikirja autorid loodavad, et kirjapandust on abi järvede tervendamisega seotud inimestele ja lõppkokkuvõttes meie paljude järvede tervisele. Kõik täiendused, parandused ja ettepanekud, mis võiksid kaasa aidata sisuka ja kasuliku käsiraamatu valmimisele, on teretulnud aadressile: Lea Tuvikene, Limnoloogiakeskus, Rannu 61117, Tartumaa , või e - posti aadressile lea.tuvikene@emu.eeKirje Role of potentially toxic cyanobacteria in crustacean zooplankton diet in a eutrophic lake(Elsevier, 2019) Agasild, Helen; Panksep, Kristel; Tõnno, Ilmar; Blank, Kätlin; Kõiv, Toomas; Freiberg, René; Laugaste, Reet; Jones, Roger I.; Nõges, Peeter; Nõges, Tiina; Chair of Hydrobiology and Fishery. Institute of Agricultural and Environmental SciencesThe coexistence of potentially toxic bloom-forming cyanobacteria (CY) and generally smaller-sized grazer communities has raised the question of zooplankton (ZP) ability to control harmful cyanobacterial blooms and highlighted the need for species-specific research on ZP-CY trophic interactions in naturally occurring communities. A combination of HPLC, molecular and stable isotope analyses was used to assess in situ the importance of CY as a food source for dominant crustacean ZP species and to quantify the grazing on potentially toxic strains of Microcystis during bloom formation in large eutrophic Lake Peipsi (Estonia). Aphanizomenon, Dolichospermum, Gloeotrichia and Microcystis dominated bloom-forming CY, while Microcystis was the major genus producing cyanotoxins all over the lake. Grazing studies showed that CY, and especially colonial CY, formed a significant, and also preferred component of algae ingested by the cladocerans Bosmina spp. and Daphnia spp. while this was not the case for the more selective calanoid copepod Eudiaptomus gracilis. Molecular analyses confirmed the presence of CY, including Microcystis, in ZP guts. Further analyses using qPCR targeting cyanobacterial genusspecific mcyE synthase genes indicated that potentially toxic strains of Microcystis can be ingested directly or indirectly by all the dominant crustacean grazers. However, stable isotope analyses indicated that little, if any, assimilation from ingested bloom-forming CY occurred. The study suggests that CY, and particularly Microcystis with both potentially toxic and non-toxic strains, can be widely ingested by cladoceran grazers during a bloom event with implications for control of CY abundance and for transfer of CY toxins through the food web.Kirje Seasonal data on phytoplankton, zooplankton and zooplankton feeding from Lake Peipsi (Estonia)(EMU DSpace, 2019) Agasild, Helen; Panksep, Kristel; Tõnno, Ilmar; Blank, Kätlin; Kõiv, Toomas; Freiberg, René; Laugaste, Reet; Jones, Roger I.; Nõges, Peeter; Nõges, TiinaAbstract of the article : The coexistence of potentially toxic bloom-forming cyanobacteria (CY) and generally smaller-sized grazer communities has raised the question of zooplankton (ZP) ability to control harmful cyanobacterial blooms and highlighted the need for species-specific research on ZP-CY trophic interactions in naturally occurring communities. A combination of HPLC, molecular and stable isotope analyses was used to assess in situ the importance of CY as a food source for dominant crustacean ZP species and to quantify the grazing on potentially toxic strains of Microcystis during bloom formation in large eutrophic Lake Peipsi (Estonia). Aphanizomenon, Dolichospermum, Gloeotrichia and Microcystis dominated bloom-forming CY, while Microcystis was the major genus producing cyanotoxins all over the lake. Grazing studies showed that CY, and especially colonial CY, formed a significant, and also preferred component of algae ingested by the cladocerans Bosmina spp. and Daphnia spp. while this was not the case for the more selective calanoid copepod Eudiaptomus gracilis. Molecular analyses confirmed the presence of CY, including Microcystis, in ZP guts. Further analyses using qPCR targeting cyanobacterial genus-specific mcyE synthase genes indicated that potentially toxic strains of Microcystis can be ingested directly or indirectly by all the dominant crustacean grazers. However, stable isotope analyses indicated that little, if any, assimilation from ingested bloom-forming CY occurred. The study suggests that CY, and particularly Microcystis with both potentially toxic and non-toxic strains, can be widely ingested by cladoceran grazers during a bloom event with implications for control of CY abundance and for transfer of CY toxins through the food web.Kirje Siseveekogud : õpik kõrgkoolidele(Kalanduse teabekeskus, 2020) Järvalt, Ain; Järvekülg, Rein; Kisand, Anu; Mäemets, Helle; Ott, Ingmar; Panksep, Kristel; Pedusaar, Tiia; Tammert, Helen; Timm, Henn; Tuvikene, Arvo; Tuvikene, Lea; Tõnno, Ilmar; Vilbaste, Sirje; Ott, Ingmar (koostaja); Timm, Henn (koostaja)Inimeste kõige tavalisemad seosed siseveekogudega on matkamine, kalapüük, suplemine, janu kustutamine ja taimede kastmine. Et veekogude ääres viibimine mõjub paljudele rahustavalt, on jõgedel-järvedel miljonivaadete kaudu kindel koht ka kinnisvaraäris. Veekogudeta ei saa läbi sportlased (purjetajad, sõudjad ja motohuvilised). Leidub selliseidki indiviide, keda meelitavad mittesöödavad või koguni palja silmaga nähtamatud vee-elanikud. Eesti on väike madal maa, millel on pikk mererand, aga kus leidub ka palju siseveekogusid. Eriline on kahe suure järve – Peipsi ja Võrtsjärve – asumine lähestikku. Seisuvete pindala osakaalu järgi kogu riigi pindalast on Eesti Euroopas pärast Soomet ja Rootsit koos Norraga kolmandal-neljandal kohal. Eesti ja tema ümbrus on puhta veega seni niisiis hästi varustatud, kuid see rikkus ühtlasi kohustab veekogusid heaperemehelikult ja jätkusuutlikult majandama. Ka Eestis on muresid nii veevarude, veekogude kui nende seisundiga. Sisevete uurimine on Eestis kestnud juba üle 100 aasta. Seda on süstemaatiliselt korraldanud nii Looduseuurijate Selts, Tartu Riiklik Ülikool, Teaduste Akadeemia kui Maaülikool. Suurte järvede kõrval pole unustatud väikesi järvi ega vooluveekogusid. Uurida vee ja veekogude omadusi, arendada ja kasvatada nende spetsialiste ongi mõistlik seal, kus on, mida tundma õppida. Üha enam leitakse seoseid looduslike ja inimtekkeliste mõjurite ning ökosüsteemide vastuste vahel. Ühtlasi ühendatakse neid seoseid sotsiaalmajanduslike küsimuste ja looduskaitsega. Eesti siseveekogude kohta on peale arvukate ja enamasti võõrkeelsete teadusartiklite ilmunud ka eestikeelseid raamatuid. Siin neist väike loetelu: väikejärved (Eesti järved, 1968; Mäemets, 1977; Laarmaa jt 2019); Võrtsjärv (1973, 2003); Peipsi (1999, 2008), vooluveed (Järvekülg jt 2001; Timm jt 2019). Kalaraamatuid esindavad Mikelsaar (1984) ning Hunt (2019), veetaimi „Eesti taimede määraja“ (2010). Silmaga nähtavate veeselgrootute ülevaate pakub Timm (2015). Ülevaatlikku eestikeelset õpikut siseveekogude ning nende talitlemise kohta seni polnud. Eesti ülikoolides on kõigil kolmel õppetasandil (bakalaureuse-, magistri- ja doktoriõpe) õppekavasid, kus vajatakse teadmisi siseveekogudest. Võõrkeelseid eeskujusid leidub päris mitu, kuid need käsitlevad enamasti kas ainult hüdrobioloogiat või limnoloogiat. Esimene on elustiku-, teine keskkonna-alase suunitlusega. Uus õpik sisaldab mõlemaid ning sobib loodetavasti paljudele loodusteaduslikele ja looduskaitselistele kursustele, eriti bakalaureusetasemel. Õpik koosneb kolmest suurest alajaotusest: (1) siseveekogude füüsikalis-keemiline iseloomustus, levik ja teke; (2) elupaigad veekogudes, olulised elustikurühmad ning nendevahelised suhted; (3) siseveekogude majandamine, kaitse ja tervendamine. Peamiselt vaadeldakse Eesti siseveekogusid, aga seda kogu maailma taustal. Koostajad loodavad, et raamat annab lugejatele nii vastuseid küsimustele kui ka süvendab huvi sisevete kui kaunite, põnevate ning inimestele eluliselt oluliste loodusobjektide suhtes.Kirje Stratification strength and light climate explain variation in chlorophyll a at the continental scale in a European multilake survey in a heatwave summer(ASLO, 2021) Donis, Daphne; Mantzouki, Evanthia; McGinnis, Daniel F.; Vachon, Dominic; Gallego, Irene; Grossart, Hans‐Peter; Senerpont Domis, Lisette N.; Teurlincx, Sven; Seelen, Laura; Lürling, Miquel; Verstijnen, Yvon; Maliaka, Valentini; Fonvielle, Jeremy; Visser, Petra M.; Verspagen, Jolanda; Herk, Maria; Antoniou, Maria G.; Tsiarta, Nikoletta; McCarthy, Valerie; Perello, Victor C.; Machado‐Vieira, Danielle; Oliveira, Alinne Gurjão; Maronić, Dubravka Špoljarić; Stević, Filip; Pfeiffer, Tanja Žuna; Vucelić, Itana Bokan; Žutinić, Petar; Udovič, Marija Gligora; Plenković‐Moraj, Anđelka; Bláha, Luděk; Geriš, Rodan; Fránková, Markéta; Christoffersen, Kirsten Seestern; Warming Trine Perlt; Feldmann, Tõnu; Laas, Alo; Panksep, Kristel; Tuvikene, Lea; Kangro, Kersti; Koreivienė, Judita; Karosienė, Jūratė; Kasperovičienė, Jūratė; Savadova‐Ratkus, Ksenija; Vitonytė, Irma; Häggqvist, Kerstin; Salmi, Pauliina; Arvola, Lauri; Rothhaupt, Karl; Avagianos, Christos; Kaloudis, Triantafyllos; Gkelis, Spyros; Panou, Manthos; Triantis, Theodoros; Zervou, Sevasti‐Kiriaki; Hiskia, Anastasia; Obertegger, Ulrike; Boscaini, Adriano; Flaim, Giovanna; Salmaso, Nico; Cerasino, Leonardo; Haande, Sigrid; Skjelbred, Birger; Grabowska, Magdalena; Karpowicz, Maciej; Chmura, Damian; Nawrocka, Lidia; Kobos, Justyna; Mazur‐Marzec, Hanna; Alcaraz‐Párraga, Pablo; Wilk‐Woźniak, Elżbieta; Krztoń, Wojciech; Walusiak, Edward; Gagala‐Borowska, Ilona; Mankiewicz‐Boczek, Joana; Toporowska, Magdalena; Pawlik‐Skowronska, Barbara; Niedźwiecki, Michał; Pęczuła, Wojciech; Napiórkowska‐Krzebietke, Agnieszka; Dunalska, Julita; Sieńska, Justyna; Szymański, Daniel; Kruk, Marek; Budzyńska, Agnieszka; Goldyn, Ryszard; Kozak, Anna; Rosińska, Joanna; Szeląg‐Wasielewska, Elżbieta; Domek, Piotr; Jakubowska‐Krepska, Natalia; Kwasizur, Kinga; Messyasz, Beata; Pełechata, Aleksandra; Pełechaty, Mariusz; Kokocinski, Mikolaj; Madrecka‐Witkowska, Beata; Kostrzewska‐Szlakowska, Iwona; Frąk, Magdalena; Bańkowska‐Sobczak, Agnieszka; Wasilewicz, Michał; Ochocka, Agnieszka; Pasztaleniec, Agnieszka; Jasser, Iwona; Antão‐Geraldes, Ana M.; Leira, Manel; Vasconcelos, Vitor; Morais, Joao; Vale, Micaela; Raposeiro, Pedro M.; Gonçalves, Vítor; Aleksovski, Boris; Krstić, Svetislav; Nemova, Hana; Drastichova, Iveta; Chomova, Lucia; Remec‐Rekar, Spela; Elersek, Tina; Hansson, Lars‐Anders; Urrutia‐Cordero, Pablo; Bravo, Andrea G.; Buck, Moritz; Colom‐Montero, William; Mustonen, Kristiina; Pierson, Don; Yang, Yang; Richardson, Jessica; Edwards, Christine; Cromie, Hannah; Delgado‐Martín, Jordi; García, David; Cereijo, Jose Luís; Gomà, Joan; Trapote, Mari Carmen; Vegas‐Vilarrúbia, Teresa; Obrador, Biel; García‐Murcia, Ana; Real, Monserrat; Romans, Elvira; Noguero‐Ribes, Jordi; Duque, David Parreño; Fernández‐Morán, Elísabeth; Úbeda, Bárbara; Gálvez, José Ángel; Catalán, Núria; Pérez‐Martínez, Carmen; Ramos‐Rodríguez, Eloísa; Cillero‐Castro, Carmen; Moreno‐Ostos, Enrique; Blanco, José María; Rodríguez, Valeriano; Montes‐Pérez, Jorge Juan; Palomino, Roberto L.; Rodríguez‐Pérez, Estela; Hernández, Armand; Carballeira, Rafael; Camacho, Antonio; Picazo, Antonio; Rochera, Carlos; Santamans, Anna C.; Ferriol, Carmen; Romo, Susana; Soria, Juan Miguel; Özen, Arda; Karan, Tünay; Demir, Nilsun; Beklioğlu, Meryem; Filiz, Nur; Levi, Eti; Iskin, Uğur; Bezirci, Gizem; Tavşanoğlu, Ülkü Nihan; Çelik, Kemal; Ozhan, Koray; Karakaya, Nusret; Koçer, Mehmet Ali Turan; Yilmaz, Mete; Maraşlıoğlu, Faruk; Fakioglu, Özden; Soylu, Elif Neyran; Yağcı, Meral Apaydın; Çınar, Şakir; Çapkın, Kadir; Yağcı, Abdulkadir; Cesur, Mehmet; Bilgin, Fuat; Bulut, Cafer; Uysal, Rahmi; Latife, Köker; Akçaalan, Reyhan; Albay, Meriç; Alp, Mehmet Tahir; Özkan, Korhan; Sevindik, Tuğba Ongun; Tunca, Hatice; Önem, Burçin; Paerl, Hans; Carey, Cayelan C.; Ibelings, Bastiaan W.To determine the drivers of phytoplankton biomass, we collected standardized morphometric, physical, and biological data in 230 lakes across the Mediterranean, Continental, and Boreal climatic zones of the European continent. Multilinear regression models tested on this snapshot of mostly eutrophic lakes (median total phos- phorus [TP] = 0.06 and total nitrogen [TN] = 0.7 mg L 1 ), and its subsets (2 depth types and 3 climatic zones), show that light climate and stratification strength were the most significant explanatory variables for chloro- phyll a (Chl a) variance. TN was a significant predictor for phytoplankton biomass for shallow and continental lakes, while TP never appeared as an explanatory variable, suggesting that under high TP, light, which partially controls stratification strength, becomes limiting for phytoplankton development. Mediterranean lakes were the warmest yet most weakly stratified and had significantly less Chl a than Boreal lakes, where the temperature anomaly from the long-term average, during a summer heatwave was the highest (+4 C) and showed a signifi- cant, exponential relationship with stratification strength. This European survey represents a summer snapshot of phytoplankton biomass and its drivers, and lends support that light and stratification metrics, which are both affected by climate change, are better predictors for phytoplankton biomass in nutrient-rich lakes than nutrient concentrations and surface temperature.Kirje Temperature Effects Explain Continental Scale Distribution of Cyanobacterial Toxins(MDPI, 2018) Mantzouki, Evanthia; Lürling, Miquel; Fastner, Jutta; De Senerpont Domis, Lisette; Wilk-Woźniak, Elżbieta; Koreivienė, Judita; Seelen, Laura; Teurlincx, Sven; Verstijnen, Yvon; Krztoń, Wojciech; Walusiak, Edward; Karosienė, Jūratė; Kasperovičienė, Jūratė; Savadova, Ksenija; Vitonytė, Irma; Cillero-Castro, Carmen; Budzynska, Agnieszka; Goldyn, Ryszard; Kozak, Anna; Rosińska, Joanna; Szeląg-Wasielewska, Elżbieta; Domek, Piotr; Jakubowska-Krepska, Natalia; Kwasizur, Kinga; Messyasz, Beata; Pełechata, Aleksandra; Pełechaty, Mariusz; Kokocinski, Mikolaj; García-Murcia, Ana; Real, Monserrat; Romans, Elvira; Noguero-Ribes, Jordi; Duque, David Parreño; Fernández-Morán, Elísabeth; Karakaya, Nusret; Häggqvist, Kerstin; Demir, Nilsun; Beklioğlu, Meryem; Filiz, Nur; Levi, Eti E.; Iskin, Uğur; Bezirci, Gizem; Tavşanoğlu, Ülkü Nihan; Özhan, Koray; Gkelis, Spyros; Panou, Manthos; Fakioglu, Özden; Avagianos, Christos; Kaloudis, Triantafyllos; Çelik, Kemal; Yilmaz, Mete; Marcé, Rafael; Catalán, Nuria; Bravo, Andrea G.; Buck, Moritz; Colom-Montero, William; Mustonen, Kristiina; Pierson, Don; Yang, Yang; Raposeiro, Pedro M.; Gonçalves, Vítor; Antoniou, Maria G.; Tsiarta, Nikoletta; McCarthy, Valerie; Perello, Victor C.; Feldmann, Tõnu; Laas, Alo; Panksep, Kristel; Tuvikene, Lea; Gagala, Ilona; Mankiewicz-Boczek, Joana; Yağcı, Meral Apaydın; Çınar, Şakir; Çapkın, Kadir; Yağcı, Abdulkadir; Cesur, Mehmet; Bilgin, Fuat; Bulut, Cafer; Uysal, Rahmi; Obertegger, Ulrike; Boscaini, Adriano; Flaim, Giovanna; Salmaso, Nico; Cerasino, Leonardo; Richardson, Jessica; Visser, Petra M.; Verspagen, Jolanda M. H.; Karan, Tünay; Soylu, Elif Neyran; Maraşlıoğlu, Faruk; Napiórkowska-Krzebietke, Agnieszka; Ochocka, Agnieszka; Pasztaleniec, Agnieszka; Antão-Geraldes, Ana M.; Vasconcelos, Vitor; Morais, João; Vale, Micaela; Köker, Latife; Akçaalan, Reyhan; Albay, Meriç; Maronić, Dubravka Špoljarić; Stević, Filip; Pfeiffer, Tanja Žuna; Fonvielle, Jeremy; Straile, Dietmar; Rothhaupt, Karl-Otto; Hansson, Lars-Anders; Urrutia-Cordero, Pablo; Bláha, Luděk; Geriš, Rodan; Fránková, Markéta; Kocer, Mehmet Ali Turan; Alp, Mehmet Tahir; Remec-Rekar, Spela; Elersek, Tina; Triantis, Theodoros; Zervou, Sevasti-Kiriaki; Hiskia, Anastasia; Haande, Sigrid; Skjelbred, Birger; Madrecka, Beata; Nemova, Hana; Drastichova, Iveta; Chomova, Lucia; Edwards, Christine; Sevindik, Tuğba Ongun; Tunca, Hatice; Önem, Burçin; Aleksovski, Boris; Krstić, Svetislav; Vucelić, Itana Bokan; Nawrocka, Lidia; Salmi, Pauliina; Machado-Vieira, Danielle; De Oliveira, Alinne Gurjão; Delgado-Martín, Jordi; García, David; Cereijo, Jose Luis; Gomà, Joan; Trapote, Mari Carmen; Vegas-Vilarrúbia, Teresa; Obrador, Biel; Grabowska, Magdalena; Karpowicz, Maciej; Chmura, Damian; Úbeda, Bárbara; Gálvez, José Ángel; Özen, Arda; Christoffersen, Kirsten S.; Warming Trine Perlt; Kobos, Justyna; Mazur-Marzec, Hanna; Pérez-Martínez, Carmen; Ramos-Rodríguez, Eloísa; Arvola, Lauri; Alcaraz-Párraga, Pablo; Toporowska, Magdalena; Pawlik-Skowronska, Barbara; Niedźwiecki, Michał; Pęczuła, Wojciech; Leira, Manel; Hernández, Armand; Moreno-Ostos, Enrique; Blanco, José María; Rodríguez, Valeriano; Montes-Pérez, Jorge Juan; Palomino, Roberto L.; Rodríguez-Pérez, Estela; Carballeira, Rafael; Camacho, Antonio; Picazo, Antonio; Rochera, Carlos; Santamans, Anna C.; Ferriol, Carmen; Romo, Susana; Soria, Juan Miguel; Dunalska, Julita; Sieńska, Justyna; Szymański, Daniel; Kruk, Marek; Kostrzewska-Szlakowska, Iwona; Jasser, Iwona; Žutinić, Petar; Udovič, Marija Gligora; Plenković-Moraj, Anđelka; Frąk, Magdalena; Bańkowska-Sobczak, Agnieszka; Wasilewicz, Michał; Özkan, Korhan; Maliaka, Valentini; Kangro, Kersti; Grossart, Hans-Peter; Paerl, Hans W.; Carey, Cayelan C.; Ibelings, Bas W.; Institute of Agricultural and Environmental SciencesInsight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains.