TY  - JOUR
A1  - Leach, Taylor H.
A1  - Beisner, Beatrix E.
A1  - Carey, Cayelan C.
A1  - Pernica, Patricia
A1  - Rose, Kevin C.
A1  - Huot, Yannick
A1  - Brentrup, Jennifer A.
A1  - Domaizon, Isabelle
A1  - Grossart, Hans-Peter
A1  - Ibelings, Bastiaan W.
A1  - Jacquet, Stephan
A1  - Kelly, Patrick T.
A1  - Rusak, James A.
A1  - Stockwell, Jason D.
A1  - Straile, Dietmar
A1  - Verburg, Piet
T1  - Patterns and drivers of deep chlorophyll maxima structure in 100 lakes
BT  - the relative importance of light and thermal stratification
JF  - Limnology and oceanography
N2  - The vertical distribution of chlorophyll in stratified lakes and reservoirs frequently exhibits a maximum peak deep in the water column, referred to as the deep chlorophyll maximum (DCM). DCMs are ecologically important hot spots of primary production and nutrient cycling, and their location can determine vertical habitat gradients for primary consumers. Consequently, the drivers of DCM structure regulate many characteristics of aquatic food webs and biogeochemistry. Previous studies have identified light and thermal stratification as important drivers of summer DCM depth, but their relative importance across a broad range of lakes is not well resolved. We analyzed profiles of chlorophyll fluorescence, temperature, and light during summer stratification from 100 lakes in the Global Lake Ecological Observatory Network (GLEON) and quantified two characteristics of DCM structure: depth and thickness. While DCMs do form in oligotrophic lakes, we found that they can also form in eutrophic to dystrophic lakes. Using a random forest algorithm, we assessed the relative importance of variables associated with light attenuation vs. thermal stratification for predicting DCM structure in lakes that spanned broad gradients of morphometry and transparency. Our analyses revealed that light attenuation was a more important predictor of DCM depth than thermal stratification and that DCMs deepen with increasing lake clarity. DCM thickness was best predicted by lake size with larger lakes having thicker DCMs. Additionally, our analysis demonstrates that the relative importance of light and thermal stratification on DCM structure is not uniform across a diversity of lake types.
Y1  - 2018
U6  - https://doi.org/10.1002/lno.10656
SN  - 0024-3590
SN  - 1939-5590
VL  - 63
IS  - 2
SP  - 628
EP  - 646
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Mantzouki, Evanthia
A1  - Lurling, Miquel
A1  - Fastner, Jutta
A1  - Domis, Lisette Nicole de Senerpont
A1  - Wilk-Wozniak, Elzbieta
A1  - Koreiviene, Judita
A1  - Seelen, Laura
A1  - Teurlincx, Sven
A1  - Verstijnen, Yvon
A1  - Krzton, Wojciech
A1  - Walusiak, Edward
A1  - Karosiene, Jurate
A1  - Kasperoviciene, Jurate
A1  - Savadova, Ksenija
A1  - Vitonyte, Irma
A1  - Cillero-Castro, Carmen
A1  - Budzynska, Agnieszka
A1  - Goldyn, Ryszard
A1  - Kozak, Anna
A1  - Rosinska, Joanna
A1  - Szelag-Wasielewska, Elzbieta
A1  - Domek, Piotr
A1  - Jakubowska-Krepska, Natalia
A1  - Kwasizur, Kinga
A1  - Messyasz, Beata
A1  - Pelechata, Aleksandra
A1  - Pelechaty, Mariusz
A1  - Kokocinski, Mikolaj
A1  - Garcia-Murcia, Ana
A1  - Real, Monserrat
A1  - Romans, Elvira
A1  - Noguero-Ribes, Jordi
A1  - Parreno Duque, David
A1  - Fernandez-Moran, Elisabeth
A1  - Karakaya, Nusret
A1  - Haggqvist, Kerstin
A1  - Demir, Nilsun
A1  - Beklioglu, Meryem
A1  - Filiz, Nur
A1  - Levi, Eti E.
A1  - Iskin, Ugur
A1  - Bezirci, Gizem
A1  - Tavsanoglu, Ulku Nihan
A1  - Ozhan, Koray
A1  - Gkelis, Spyros
A1  - Panou, Manthos
A1  - Fakioglu, Ozden
A1  - Avagianos, Christos
A1  - Kaloudis, Triantafyllos
A1  - Celik, Kemal
A1  - Yilmaz, Mete
A1  - Marce, Rafael
A1  - Catalan, Nuria
A1  - Bravo, Andrea G.
A1  - Buck, Moritz
A1  - Colom-Montero, William
A1  - Mustonen, Kristiina
A1  - Pierson, Don
A1  - Yang, Yang
A1  - Raposeiro, Pedro M.
A1  - Goncalves, Vitor
A1  - Antoniou, Maria G.
A1  - Tsiarta, Nikoletta
A1  - McCarthy, Valerie
A1  - Perello, Victor C.
A1  - Feldmann, Tonu
A1  - Laas, Alo
A1  - Panksep, Kristel
A1  - Tuvikene, Lea
A1  - Gagala, Ilona
A1  - Mankiewicz-Boczek, Joana
A1  - Yagci, Meral Apaydin
A1  - Cinar, Sakir
A1  - Capkin, Kadir
A1  - Yagci, Abdulkadir
A1  - Cesur, Mehmet
A1  - Bilgin, Fuat
A1  - Bulut, Cafer
A1  - Uysal, Rahmi
A1  - Obertegger, Ulrike
A1  - Boscaini, Adriano
A1  - Flaim, Giovanna
A1  - Salmaso, Nico
A1  - Cerasino, Leonardo
A1  - Richardson, Jessica
A1  - Visser, Petra M.
A1  - Verspagen, Jolanda M. H.
A1  - Karan, Tunay
A1  - Soylu, Elif Neyran
A1  - Maraslioglu, Faruk
A1  - Napiorkowska-Krzebietke, Agnieszka
A1  - Ochocka, Agnieszka
A1  - Pasztaleniec, Agnieszka
A1  - Antao-Geraldes, Ana M.
A1  - Vasconcelos, Vitor
A1  - Morais, Joao
A1  - Vale, Micaela
A1  - Koker, Latife
A1  - Akcaalan, Reyhan
A1  - Albay, Meric
A1  - Maronic, Dubravka Spoljaric
A1  - Stevic, Filip
A1  - Pfeiffer, Tanja Zuna
A1  - Fonvielle, Jeremy Andre
A1  - Straile, Dietmar
A1  - Rothhaupt, Karl-Otto
A1  - Hansson, Lars-Anders
A1  - Urrutia-Cordero, Pablo
A1  - Blaha, Ludek
A1  - Geris, Rodan
A1  - Frankova, Marketa
A1  - Kocer, Mehmet Ali Turan
A1  - Alp, Mehmet Tahir
A1  - Remec-Rekar, Spela
A1  - Elersek, Tina
A1  - Triantis, Theodoros
A1  - Zervou, Sevasti-Kiriaki
A1  - Hiskia, Anastasia
A1  - Haande, Sigrid
A1  - Skjelbred, Birger
A1  - Madrecka, Beata
A1  - Nemova, Hana
A1  - Drastichova, Iveta
A1  - Chomova, Lucia
A1  - Edwards, Christine
A1  - Sevindik, Tugba Ongun
A1  - Tunca, Hatice
A1  - OEnem, Burcin
A1  - Aleksovski, Boris
A1  - Krstic, Svetislav
A1  - Vucelic, Itana Bokan
A1  - Nawrocka, Lidia
A1  - Salmi, Pauliina
A1  - Machado-Vieira, Danielle
A1  - de Oliveira, Alinne Gurjao
A1  - Delgado-Martin, Jordi
A1  - Garcia, David
A1  - Cereijo, Jose Luis
A1  - Goma, Joan
A1  - Trapote, Mari Carmen
A1  - Vegas-Vilarrubia, Teresa
A1  - Obrador, Biel
A1  - Grabowska, Magdalena
A1  - Karpowicz, Maciej
A1  - Chmura, Damian
A1  - Ubeda, Barbara
A1  - Angel Galvez, Jose
A1  - Ozen, Arda
A1  - Christoffersen, Kirsten Seestern
A1  - Warming, Trine Perlt
A1  - Kobos, Justyna
A1  - Mazur-Marzec, Hanna
A1  - Perez-Martinez, Carmen
A1  - Ramos-Rodriguez, Eloisa
A1  - Arvola, Lauri
A1  - Alcaraz-Parraga, Pablo
A1  - Toporowska, Magdalena
A1  - Pawlik-Skowronska, Barbara
A1  - Niedzwiecki, Michal
A1  - Peczula, Wojciech
A1  - Leira, Manel
A1  - Hernandez, Armand
A1  - Moreno-Ostos, Enrique
A1  - Maria Blanco, Jose
A1  - Rodriguez, Valeriano
A1  - Juan Montes-Perez, Jorge
A1  - Palomino, Roberto L.
A1  - Rodriguez-Perez, Estela
A1  - Carballeira, Rafael
A1  - Camacho, Antonio
A1  - Picazo, Antonio
A1  - Rochera, Carlos
A1  - Santamans, Anna C.
A1  - Ferriol, Carmen
A1  - Romo, Susana
A1  - Miguel Soria, Juan
A1  - Dunalska, Julita
A1  - Sienska, Justyna
A1  - Szymanski, Daniel
A1  - Kruk, Marek
A1  - Kostrzewska-Szlakowska, Iwona
A1  - Jasser, Iwona
A1  - Zutinic, Petar
A1  - Udovic, Marija Gligora
A1  - Plenkovic-Moraj, Andelka
A1  - Frak, Magdalena
A1  - Bankowska-Sobczak, Agnieszka
A1  - Wasilewicz, Michal
A1  - Ozkan, Korhan
A1  - Maliaka, Valentini
A1  - Kangro, Kersti
A1  - Grossart, Hans-Peter
A1  - Paerl, Hans W.
A1  - Carey, Cayelan C.
A1  - Ibelings, Bas W.
T1  - Temperature effects explain continental scale distribution of cyanobacterial toxins
JF  - Toxins
N2  - Insight 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.
KW  - microcystin
KW  - anatoxin
KW  - cylindrospermopsin
KW  - temperature
KW  - direct effects
KW  - indirect effects
KW  - spatial distribution
KW  - European Multi Lake Survey
Y1  - 2018
U6  - https://doi.org/10.3390/toxins10040156
SN  - 2072-6651
VL  - 10
IS  - 4
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Mantzouki, Evanthia
A1  - Campbell, James
A1  - van Loon, Emiel
A1  - Visser, Petra
A1  - Konstantinou, Iosif
A1  - Antoniou, Maria
A1  - Giuliani, Gregory
A1  - Machado-Vieira, Danielle
A1  - de Oliveira, Alinne Gurjao
A1  - Maronic, Dubravka Spoljaric
A1  - Stevic, Filip
A1  - Pfeiffer, Tanja Zuna
A1  - Vucelic, Itana Bokan
A1  - Zutinic, Petar
A1  - Udovic, Marija Gligora
A1  - Plenkovic-Moraj, Andelka
A1  - Tsiarta, Nikoletta
A1  - Blaha, Ludek
A1  - Geris, Rodan
A1  - Frankova, Marketa
A1  - Christoffersen, Kirsten Seestern
A1  - Warming, Trine Perlt
A1  - Feldmann, Tonu
A1  - Laas, Alo
A1  - Panksep, Kristel
A1  - Tuvikene, Lea
A1  - Kangro, Kersti
A1  - Haggqvist, Kerstin
A1  - Salmi, Pauliina
A1  - Arvola, Lauri
A1  - Fastner, Jutta
A1  - Straile, Dietmar
A1  - Rothhaupt, Karl-Otto
A1  - Fonvielle, Jeremy Andre
A1  - Grossart, Hans-Peter
A1  - Avagianos, Christos
A1  - Kaloudis, Triantafyllos
A1  - Triantis, Theodoros
A1  - Zervou, Sevasti-Kiriaki
A1  - Hiskia, Anastasia
A1  - Gkelis, Spyros
A1  - Panou, Manthos
A1  - McCarthy, Valerie
A1  - Perello, Victor C.
A1  - Obertegger, Ulrike
A1  - Boscaini, Adriano
A1  - Flaim, Giovanna
A1  - Salmaso, Nico
A1  - Cerasino, Leonardo
A1  - Koreiviene, Judita
A1  - Karosiene, Jurate
A1  - Kasperoviciene, Jurate
A1  - Savadova, Ksenija
A1  - Vitonyte, Irma
A1  - Haande, Sigrid
A1  - Skjelbred, Birger
A1  - Grabowska, Magdalena
A1  - Karpowicz, Maciej
A1  - Chmura, Damian
A1  - Nawrocka, Lidia
A1  - Kobos, Justyna
A1  - Mazur-Marzec, Hanna
A1  - Alcaraz-Parraga, Pablo
A1  - Wilk-Wozniak, Elzbieta
A1  - Krzton, Wojciech
A1  - Walusiak, Edward
A1  - Gagala, Ilona
A1  - Mankiewicz-Boczek, Joana
A1  - Toporowska, Magdalena
A1  - Pawlik-Skowronska, Barbara
A1  - Niedzwiecki, Michal
A1  - Peczula, Wojciech
A1  - Napiorkowska-Krzebietke, Agnieszka
A1  - Dunalska, Julita
A1  - Sienska, Justyna
A1  - Szymanski, Daniel
A1  - Kruk, Marek
A1  - Budzynska, Agnieszka
A1  - Goldyn, Ryszard
A1  - Kozak, Anna
A1  - Rosinska, Joanna
A1  - Szelag-Wasielewska, Elzbieta
A1  - Domek, Piotr
A1  - Jakubowska-Krepska, Natalia
A1  - Kwasizur, Kinga
A1  - Messyasz, Beata
A1  - Pelechata, Aleksandra
A1  - Pelechaty, Mariusz
A1  - Kokocinski, Mikolaj
A1  - Madrecka, Beata
A1  - Kostrzewska-Szlakowska, Iwona
A1  - Frak, Magdalena
A1  - Bankowska-Sobczak, Agnieszka
A1  - Wasilewicz, Michal
A1  - Ochocka, Agnieszka
A1  - Pasztaleniec, Agnieszka
A1  - Jasser, Iwona
A1  - Antao-Geraldes, Ana M.
A1  - Leira, Manel
A1  - Hernandez, Armand
A1  - Vasconcelos, Vitor
A1  - Morais, Joao
A1  - Vale, Micaela
A1  - Raposeiro, Pedro M.
A1  - Goncalves, Vitor
A1  - Aleksovski, Boris
A1  - Krstic, Svetislav
A1  - Nemova, Hana
A1  - Drastichova, Iveta
A1  - Chomova, Lucia
A1  - Remec-Rekar, Spela
A1  - Elersek, Tina
A1  - Delgado-Martin, Jordi
A1  - Garcia, David
A1  - Luis Cereijo, Jose
A1  - Goma, Joan
A1  - Carmen Trapote, Mari
A1  - Vegas-Vilarrubia, Teresa
A1  - Obrador, Biel
A1  - Garcia-Murcia, Ana
A1  - Real, Monserrat
A1  - Romans, Elvira
A1  - Noguero-Ribes, Jordi
A1  - Parreno Duque, David
A1  - Fernandez-Moran, Elisabeth
A1  - Ubeda, Barbara
A1  - Angel Galvez, Jose
A1  - Marce, Rafael
A1  - Catalan, Nuria
A1  - Perez-Martinez, Carmen
A1  - Ramos-Rodriguez, Eloisa
A1  - Cillero-Castro, Carmen
A1  - Moreno-Ostos, Enrique
A1  - Maria Blanco, Jose
A1  - Rodriguez, Valeriano
A1  - Juan Montes-Perez, Jorge
A1  - Palomino, Roberto L.
A1  - Rodriguez-Perez, Estela
A1  - Carballeira, Rafael
A1  - Camacho, Antonio
A1  - Picazo, Antonio
A1  - Rochera, Carlos
A1  - Santamans, Anna C.
A1  - Ferriol, Carmen
A1  - Romo, Susana
A1  - Soria, Juan Miguel
A1  - Hansson, Lars-Anders
A1  - Urrutia-Cordero, Pablo
A1  - Ozen, Arda
A1  - Bravo, Andrea G.
A1  - Buck, Moritz
A1  - Colom-Montero, William
A1  - Mustonen, Kristiina
A1  - Pierson, Don
A1  - Yang, Yang
A1  - Verspagen, Jolanda M. H.
A1  - Domis, Lisette N. de Senerpont
A1  - Seelen, Laura
A1  - Teurlincx, Sven
A1  - Verstijnen, Yvon
A1  - Lurling, Miquel
A1  - Maliaka, Valentini
A1  - Faassen, Elisabeth J.
A1  - Latour, Delphine
A1  - Carey, Cayelan C.
A1  - Paerl, Hans W.
A1  - Torokne, Andrea
A1  - Karan, Tunay
A1  - Demir, Nilsun
A1  - Beklioglu, Meryem
A1  - Filiz, Nur
A1  - Levi, Eti E.
A1  - Iskin, Ugur
A1  - Bezirci, Gizem
A1  - Tavsanoglu, Ulku Nihan
A1  - Celik, Kemal
A1  - Ozhan, Koray
A1  - Karakaya, Nusret
A1  - Kocer, Mehmet Ali Turan
A1  - Yilmaz, Mete
A1  - Maraslioglu, Faruk
A1  - Fakioglu, Ozden
A1  - Soylu, Elif Neyran
A1  - Yagci, Meral Apaydin
A1  - Cinar, Sakir
A1  - Capkin, Kadir
A1  - Yagci, Abdulkadir
A1  - Cesur, Mehmet
A1  - Bilgin, Fuat
A1  - Bulut, Cafer
A1  - Uysal, Rahmi
A1  - Koker, Latife
A1  - Akcaalan, Reyhan
A1  - Albay, Meric
A1  - Alp, Mehmet Tahir
A1  - Ozkan, Korhan
A1  - Sevindik, Tugba Ongun
A1  - Tunca, Hatice
A1  - Onem, Burcin
A1  - Richardson, Jessica
A1  - Edwards, Christine
A1  - Bergkemper, Victoria
A1  - Beirne, Eilish
A1  - Cromie, Hannah
A1  - Ibelings, Bastiaan W.
T1  - Data Descriptor: A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins
JF  - Scientific Data
N2  - Under 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.
KW  - Climate-change ecology
KW  - Limnology
KW  - Water resources
Y1  - 2018
U6  - https://doi.org/10.1038/sdata.2018.226
SN  - 2052-4463
VL  - 5
PB  - Nature Publ. Group
CY  - London
ER  - 
TY  - GEN
A1  - Mantzouki, Evanthia
A1  - Lürling, Miquel
A1  - Fastner, Jutta
A1  - Domis, Lisette Nicole de Senerpont
A1  - Wilk-Woźniak, Elżbieta
A1  - Koreiviene, Judita
A1  - Seelen, Laura
A1  - Teurlincx, Sven
A1  - Verstijnen, Yvon
A1  - Krztoń, Wojciech
A1  - Walusiak, Edward
A1  - Karosienė, Jūratė
A1  - Kasperovičienė, Jūratė
A1  - Savadova, Ksenija
A1  - Vitonytė, Irma
A1  - Cillero-Castro, Carmen
A1  - Budzyńska, Agnieszka
A1  - Goldyn, Ryszard
A1  - Kozak, Anna
A1  - Rosińska, Joanna
A1  - Szeląg-Wasielewska, Elżbieta
A1  - Domek, Piotr
A1  - Jakubowska-Krepska, Natalia
A1  - Kwasizur, Kinga
A1  - Messyasz, Beata
A1  - Pełechata, Aleksandra
A1  - Pełechaty, Mariusz
A1  - Kokocinski, Mikolaj
A1  - García-Murcia, Ana
A1  - Real, Monserrat
A1  - Romans, Elvira
A1  - Noguero-Ribes, Jordi
A1  - Duque, David Parreño
A1  - Fernández-Morán, Elísabeth
A1  - Karakaya, Nusret
A1  - Häggqvist, Kerstin
A1  - Beklioğlu, Meryem
A1  - Filiz, Nur
A1  - Levi, Eti E.
A1  - Iskin, Uğur
A1  - Bezirci, Gizem
A1  - Tavşanoğlu, Ülkü Nihan
A1  - Özhan, Koray
A1  - Gkelis, Spyros
A1  - Panou, Manthos
A1  - Fakioglu, Özden
A1  - Avagianos, Christos
A1  - Kaloudis, Triantafyllos
A1  - Çelik, Kemal
A1  - Yilmaz, Mete
A1  - Marcé, Rafael
A1  - Catalán, Nuria
A1  - Bravo, Andrea G.
A1  - Buck, Moritz
A1  - Colom-Montero, William
A1  - Mustonen, Kristiina
A1  - Pierson, Don
A1  - Yang, Yang
A1  - Raposeiro, Pedro M.
A1  - Gonçalves, Vítor
A1  - Antoniou, Maria G.
A1  - Tsiarta, Nikoletta
A1  - McCarthy, Valerie
A1  - Perello, Victor C.
A1  - Feldmann, Tõnu
A1  - Laas, Alo
A1  - Panksep, Kristel
A1  - Tuvikene, Lea
A1  - Gagala, Ilona
A1  - Mankiewicz-Boczek, Joana
A1  - Yağcı, Meral Apaydın
A1  - Çınar, Şakir
A1  - Çapkın, Kadir
A1  - Yağcı, Abdulkadir
A1  - Cesur, Mehmet
A1  - Bilgin, Fuat
A1  - Bulut, Cafer
A1  - Uysal, Rahmi
A1  - Obertegger, Ulrike
A1  - Boscaini, Adriano
A1  - Flaim, Giovanna
A1  - Salmaso, Nico
A1  - Cerasino, Leonardo
A1  - Richardson, Jessica
A1  - Visser, Petra M.
A1  - Verspagen, Jolanda M. H.
A1  - Karan, Tünay
A1  - Soylu, Elif Neyran
A1  - Maraşlıoğlu, Faruk
A1  - Napiórkowska-Krzebietke, Agnieszka
A1  - Ochocka, Agnieszka
A1  - Pasztaleniec, Agnieszka
A1  - Antão-Geraldes, Ana M.
A1  - Vasconcelos, Vitor
A1  - Morais, João
A1  - Vale, Micaela
A1  - Köker, Latife
A1  - Akçaalan, Reyhan
A1  - Albay, Meriç
A1  - Maronić, Dubravka Špoljarić
A1  - Stević, Filip
A1  - Pfeiffer, Tanja Žuna
A1  - Fonvielle, Jeremy Andre
A1  - Straile, Dietmar
A1  - Rothhaupt, Karl-Otto
A1  - Hansson, Lars-Anders
A1  - Urrutia-Cordero, Pablo
A1  - Bláha, Luděk
A1  - Geriš, Rodan
A1  - Fránková, Markéta
A1  - Koçer, Mehmet Ali Turan
A1  - Alp, Mehmet Tahir
A1  - Remec-Rekar, Spela
A1  - Elersek, Tina
A1  - Triantis, Theodoros
A1  - Zervou, Sevasti-Kiriaki
A1  - Hiskia, Anastasia
A1  - Haande, Sigrid
A1  - Skjelbred, Birger
A1  - Madrecka, Beata
A1  - Nemova, Hana
A1  - Drastichova, Iveta
A1  - Chomova, Lucia
A1  - Edwards, Christine
A1  - Sevindik, Tuğba Ongun
A1  - Tunca, Hatice
A1  - Önem, Burçin
A1  - Aleksovski, Boris
A1  - Krstić, Svetislav
A1  - Vucelić, Itana Bokan
A1  - Nawrocka, Lidia
A1  - Salmi, Pauliina
A1  - Machado-Vieira, Danielle
A1  - Oliveira, Alinne Gurjão De
A1  - Delgado-Martín, Jordi
A1  - García, David
A1  - Cereijo, Jose Luís
A1  - Gomà, Joan
A1  - Trapote, Mari Carmen
A1  - Vegas-Vilarrúbia, Teresa
A1  - Obrador, Biel
A1  - Grabowska, Magdalena
A1  - Karpowicz, Maciej
A1  - Chmura, Damian
A1  - Úbeda, Bárbara
A1  - Gálvez, José Ángel
A1  - Özen, Arda
A1  - Christoffersen, Kirsten Seestern
A1  - Warming, Trine Perlt
A1  - Kobos, Justyna
A1  - Mazur-Marzec, Hanna
A1  - Pérez-Martínez, Carmen
A1  - Ramos-Rodríguez, Eloísa
A1  - Arvola, Lauri
A1  - Alcaraz-Párraga, Pablo
A1  - Toporowska, Magdalena
A1  - Pawlik-Skowronska, Barbara
A1  - Niedźwiecki, Michał
A1  - Pęczuła, Wojciech
A1  - Leira, Manel
A1  - Hernández, Armand
A1  - Moreno-Ostos, Enrique
A1  - Blanco, José María
A1  - Rodríguez, Valeriano
A1  - Montes-Pérez, Jorge Juan
A1  - Palomino, Roberto L.
A1  - Rodríguez-Pérez, Estela
A1  - Carballeira, Rafael
A1  - Camacho, Antonio
A1  - Picazo, Antonio
A1  - Rochera, Carlos
A1  - Santamans, Anna C.
A1  - Ferriol, Carmen
A1  - Romo, Susana
A1  - Soria, Juan Miguel
A1  - Dunalska, Julita
A1  - Sieńska, Justyna
A1  - Szymański, Daniel
A1  - Kruk, Marek
A1  - Kostrzewska-Szlakowska, Iwona
A1  - Jasser, Iwona
A1  - Žutinić, Petar
A1  - Udovič, Marija Gligora
A1  - Plenković-Moraj, Anđelka
A1  - Frąk, Magdalena
A1  - Bańkowska-Sobczak, Agnieszka
A1  - Wasilewicz, Michał
A1  - Özkan, Korhan
A1  - Maliaka, Valentini
A1  - Kangro, Kersti
A1  - Grossart, Hans-Peter
A1  - Paerl, Hans W.
A1  - Carey, Cayelan C.
A1  - Ibelings, Bas W.
T1  - Temperature effects explain continental scale distribution of cyanobacterial toxins
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - Insight 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.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1105 
KW  - microcystin
KW  - anatoxin
KW  - cylindrospermopsin
KW  - temperature
KW  - direct effects
KW  - indirect effects
KW  - spatial distribution
KW  - European Multi Lake Survey
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-427902
SN  - 1866-8372
IS  - 1105
ER  - 
TY  - JOUR
A1  - Hartwich, Melanie
A1  - Straile, Dietmar
A1  - Gaedke, Ursula
A1  - Wacker, Alexander
T1  - Use of ciliate and phytoplankton taxonomic composition for the estimation of eicosapentaenoic acid concentration in lakes
JF  - Freshwater biology
N2  - 1. The polyunsaturated fatty acid eicosapentaenoic acid (EPA) plays an important role in aquatic food webs, in particular at the primary producerconsumer interface where keystone species such as daphnids may be constrained by its dietary availability. Such constraints and their seasonal and interannual changes may be detected by continuous measurements of EPA concentrations. However, such EPA measurements became common only during the last two decades, whereas long-term data sets on plankton biomass are available for many well-studied lakes. Here, we test whether it is possible to estimate EPA concentrations from abiotic variables (light and temperature) and the biomass of prey organisms (e.g. ciliates, diatoms and cryptophytes) that potentially provide EPA for consumers. 2. We used multiple linear regression to relate size- and taxonomically resolved plankton biomass data and measurements of temperature and light intensity to directly measured EPA concentrations in Lake Constance during a whole year. First, we tested the predictability of EPA concentrations from the biomass of EPA-rich organisms (diatoms, cryptophytes and ciliates). Secondly, we included the variables mean temperature and mean light intensity over the sampling depth (020 m) and depth (08 and 820 m) as factors in our model to check for large-scale seasonal- and depth-dependent effects on EPA concentrations. In a third step, we included the deviations of light and temperature from mean values in our model to allow for their potential influence on the biochemical composition of plankton organisms. We used the Akaike Information Criterion to determine the best models. 3. All approaches supported our proposition that the biomasses of specific plankton groups are variables from which seston EPA concentrations can be derived. The importance of ciliates as an EPA source in the seston was emphasised by their high weight in our models, although ciliates are neglected in most studies that link fatty acids to seston taxonomic composition. The large-scale seasonal variability of light intensity and its interaction with diatom biomass were significant predictors of EPA concentrations. The deviation of temperature from mean values, accounting for a depth-dependent effect on EPA concentrations, and its interaction with ciliate biomass were also variables with high predictive power. 4. The best models from the first and second approaches were validated with measurements of EPA concentrations from another year (1997). The estimation with the best model including only biomass explained 80%, and the best model from the second approach including mean temperature and depth explained 87% of the variability in EPA concentrations in 1997. 5. We show that it is possible to predict EPA concentrations reliably from plankton biomass, while the inclusion of abiotic factors led to results that were only partly consistent with expectations from laboratory studies. Our approach of including biotic predictors should be transferable to other systems and allow checking for biochemical constraints on primary consumers.
KW  - ciliates
KW  - diatoms
KW  - eicosapentaenoic acid
KW  - light
KW  - temperature
Y1  - 2012
U6  - https://doi.org/10.1111/j.1365-2427.2012.02799.x
SN  - 0046-5070
VL  - 57
IS  - 7
SP  - 1385
EP  - 1398
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Kamjunke, Norbert
A1  - Straile, Dietmar
A1  - Gaedke, Ursula
T1  - Response of heterotrophic bacteria, autotrophic picoplankton and heterotrophic nanoflagellates to re- oligotrophication
N2  - We investigated the response of the microbial components of the pelagic food web to re-oligotrophication of large, deep Lake Constance where total phosphorus concentrations during mixing decreased from a maximum of 2.81 mu mol L- 1 in 1979 via 1.87 mu mol L-1 in 1987 to 0.26 mu mol L-1 in 2007. Measurements of heterotrophic bacteria, autotrophic picoplankton (APP) and heterotrophic nanoflagellates (HNF) in 2006 and 2007 were compared to values from 1987 to 1997. We hypothesized that the biomass and seasonal variability of all groups will decrease under more oligotrophic conditions due to reduced resource availability, particularly for APP and HNF but less for the competitively stronger bacteria. Average bacterial biomass between spring and autumn was unrelated to phosphorus, whereas the ratio of bacterial biomass to chlorophyll a concentration increased with decreasing trophy due to declining chlorophyll concentrations. In contrast, a unimodal relationship was found between APP and phosphorus with low biomass at low and high phosphorus concentrations and maximum biomass in between. Average HNF biomass decreased strongly by a factor of 10-30 with decreasing trophy, and chlorophyll-specific HNF biomass was unimodally related to phosphorus. The relative seasonal biomass variability did not change for any group during re-oligotrophication. To conclude, HNF responded much more strongly and bacteria less so than chlorophyll concentrations to oligotrophication, whereas APP exhibited a more complex pattern.
Y1  - 2009
UR  - http://plankt.oxfordjournals.org/
U6  - https://doi.org/10.1093/plankt/fbp037
SN  - 0142-7873
ER  - 
TY  - JOUR
A1  - Hart, D.
A1  - Stone, L.
A1  - Stern, A.
A1  - Straile, Dietmar
A1  - Gaedke, Ursula
T1  - Methods for balancing ecosystem flux charts : new techniques and software
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Gaedke, Ursula
A1  - Straile, Dietmar
T1  - Daphnids : Keystone species for the pelagic food web structure and energy flow ; a body size related analysis linking seasonal changes on the population and ecosystem level
N2  - Seasonal changes of the impact of daphnids on the plankton biomass size distribution, the biomass within individual size ranges, the average predator-prey weight ratios, and the efficiency to transfer matter and energy from small to large organisms are analyzed in large and deep Lake Constance based on comprehensive long-term observations. A comparison of daphnid biomass and production with those of other herbivorous groups (i. e. ciliates, rotifers, herbivorous crustaceans) reveals that in early spring daphnids play a minor role in relative and absolute values as compared to small fast growing ciliates. During this time, small algae and ciliates dominate which gives rise to a decreasing Sheldon-type size spectrum, low predator-prey weight ratios, and a low transfer efficiency along the size gradient. Around June, daphnids reach maximum abundances and become keystone species for the shape of the biomass size distribution, the food web structure, and the energy flow. They accumulate biomass in their size range one order of magnitude above the average. The slope of the normalized biomass size spectrum is less negative and positively correlated with daphnid biomass if the latter exceeds about 200 mg C/m2. This indicates a more efficient transfer along the size gradient with high predator-prey weight ratios and high trophic transfer efficiencies. The coefficients of determination of regression lines fitted to size distributions decrease with daphnid abundance, i. e. the size spectra become more irregular when daphnids dominate. In midsummer, daphnids lose their dominance and coexist with other herbivores (especially ciliates) in a highly diverse plankton community. The latter gives rise to a relatively smooth and almost flat Sheldon-type size distribution, lower predator-prey weight ratios, and a slightly reduced transfer efficiency along the size gradient. In late spring/early summer, negative relationships are found between daphnid biomass and the biomasses in the size ranges of autotrophic picoplankton, small phytoplankton, heterotrophic flagellates, and small and medium sized ciliates (0.06 - 32 pg C and 100-30,000 pg C). In mid- and late summer or on annual average, hardly any of these relationships existed. This cannot solely be attributed to lower daphnid abundance but points also to a more diverse control of small plankton organisms including nutrient limitation in summer. Ciliates influence the slope and shape of the size distribution much less than daphnids although they are at least of equal importance as daphnids in respect to herbivory and related fluxes in Lake Constance on annual average. The findings on the impact of daphnids on the energy flow within the plankton food web derived from size distributions are compared to, and are consistent with results obtained by mass-balanced carbon flow diagrams.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Gaedke, Ursula
A1  - Hochstädter, Silke
A1  - Straile, Dietmar
T1  - Interplay between energy limitation and nutritional deficiency: Empirical data and food web models
N2  - Due to differences in the biochemical composition of autotrophs and their grazers, food quality can strongly influence herbivore population dynamics. Under nutrient depleted conditions the carbon to nutrient ratios of autotrophs can increase to such an extent that consumers become nutrient rather than energy limited. Estimating the importance of this effect in situ in pelagic food webs is complicated by the omnivory of many consumers and rapid nutrient recycling. Isolated predator-prey studies inadequately represent this interaction, instead an ecosystem perspective is required. We used seven years of data from large, deep Lake Constance to develop seasonally resolved flux models of the pelagic food web and analyze the balance between energetic and nutrient constraints. The carbon (C) and phosphorus (P) flows were simultaneously quantified and balanced. C represented food quantity/energy. P was taken as a surrogate of food quality, because algal C:P ratios exceeded the threshold above which P limitation of herbivores is predicted by stoichiometric theory throughout summer and autumn. Primary production exceeded bacterial C production by a factor of 3 but autotrophs and bacteria took up approximately equal amounts of P during summer and autumn. As a consequence the C and P supply of suspension-feeding zooplankton was decoupled: Consumer C demands were largely met by phytoplankton whereas P was mostly obtained from bacteria and their protist predators. The degree of consumer P deficiency varied according to supplementation of their algal diet with P-enriched bacteria or bacterivores. This favored the occurrence of omnivores, i.e. organisms that minimized P deficiencies at the cost of enhanced energy limitation. In contrast with previous perceptions, P remineralization during P depleted summer conditions was dominated by bacterivorous flagellates, carnivorous crustaceans and fish, which fed on prey with an elemental composition similar to their own, whereas herbivores contributed only 30% of P cycling despite their large biomass and C production. Our results suggested a co- limitation of predominantly herbivorous consumers by C and P and a mutual dependence of the two types of deficiency at the individual and system level. This pattern is not specific to pelagic systems but appears to be applicable across ecosystem types.
Y1  - 2002
ER  -