32 Result(s)

Article

Geographical and temporal patterns of cyanobacterial assemblages in the Danube Delta lake complexes

Danube Delta shallow lakes experience cyanobacteria blooms that can negatively affect the aquatic ecosystem. Although there are several studies on Danube Delta cyanobacteria, little is known about their spatia...

Maria Iasmina Moza, Carmen Postolache, Ana Maria Benedek… in Hydrobiologia (2021)

Article

Sex in crowded places: population density regulates reproductive strategy

Changing reproductive strategy from investment in current (asexual eggs) to future (sexual ephippia) reproduction depending on environmental cues is an important fitness trait in zooplankton species like water...

Linda Haltiner, Corinne Hänggi, Piet Spaak, Stuart R. Dennis in Hydrobiologia (2020)

Article

Diversity and distribution of Daphnia across space and time in Danube Delta lakes explained by food quality and abundance

Eutrophication of shallow lakes often triggers a series of cascading ecological effects. Among these are shifts in the zooplankton community structure due to phytoplankton changes, or shifts in the fish commun...

Ioana Enache, Larisa Isabela Florescu, Mirela Moldoveanu… in Hydrobiologia (2019)

Article

Using DNA from formaldehyde-preserved Daphnia to reconstruct past populations

We compared taxon composition of the Daphnia longispina hybrid community, as reconstructed from dormant eggs (retrieved from sediment samples) and the pelagic population (retrieved from formaldehyde-preserved zoo...

Patrick Turko, Justyna Wolinska, Christoph Tellenbach… in Hydrobiologia (2019)

Article

Sedimentary and egg-bank DNA from 3 European lakes reveal concurrent changes in the composition and diversity of cyanobacterial and Daphnia communities

Eutrophication generally favours the growth of cyanobacteria over eukaryotic green algae in freshwater lakes. Cyanobacteria constitute a poor food source for the waterflea Daphnia, an important primary consumer o...

Marie-Eve Monchamp, Ioana Enache, Patrick Turko, Francesco Pomati… in Hydrobiologia (2017)

Article

Clonal structure and depth selection during a Caullerya mesnili epidemic in a hybridizing population of the Daphnia longispina complex

Daphnia perform diel vertical migration (DVM), a predator-avoidance strategy to migrate towards deeper and colder layers in the water column in the morning and movement to the algae-rich ...

Nadine Tardent, Christoph Tellenbach, Patrick Turko, Piet Spaak in Hydrobiologia (2017)

Article

At the edge and on the top: molecular identification and ecology of Daphnia dentifera and D. longispina in high-altitude Asian lakes

The occurrence of members of the highly diverse Daphnia longispina complex in Southern and Central Asian high-mountain lakes has been recognized for more than a century. Until now, however, no molecular data have...

Markus Möst, Adam Petrusek, Ruben Sommaruga, Petr Jan Juračka… in Hydrobiologia (2013)

Article

Combined exposure to parasite and pesticide causes increased mortality in the water flea Daphnia

Organisms are exposed to multiple biotic and abiotic environmental stressors, which can influence the dynamics of individual populations and communities. Populations may also genetically adapt to both natural ...

Claudia C. Buser, Mieke Jansen, Kevin Pauwels, Luc De Meester… in Aquatic Ecology (2012)

Article

Preface

Piet Spaak in Hydrobiologia (2007)

Article

Starving with a full gut? Effect of suspended particles on the fitness of Daphnia hyalina

Suspended particles are abiotic factors that can affect the abundance of cladocerans such as daphnids. Ultra-oligotrophic Lake Brienz, situated in the front ranges of the Swiss Alps, is dominated by two major ...

Christian Rellstab, Piet Spaak in Hydrobiologia (2007)

Article

Intra-specific rDNA-ITS restriction site variation and an improved protocol to distinguish species and hybrids in the Daphnia longispina complex

A collaborative research effort was undertaken to evaluate the robustness of a recently developed genetic tool for species identification of members in the morphologically variable Daphnia longispina species comp...

Morten Skage, Anders Hobæk, Štĕpánka Ruthová, Barbara Keller… in Hydrobiologia (2007)

Article

Temporary collapse of the Daphnia population in turbid and ultra-oligotrophic Lake Brienz

The cyclical parthenogen Daphnia is a key species in aquatic food webs. Its abundance is influenced by environmental factors like food quantity and quality, predation, diseases, temperature and washout by dischar...

Christian Rellstab, Vinzenz Maurer, Markus Zeh, Hans Rudolf Bürgi… in Aquatic Sciences (2007)

Article

Macroinvertebrate diversity in fragmented Alpine streams: implications for freshwater conservation

Lakes and reservoirs disrupt the longitudinal connectivity of streams, considerably affecting benthic macroinvertebrate assemblages and diversity. Changes in assemblage composition within fragments can result ...

Michael T. Monaghan, Christopher T. Robinson, Piet Spaak, James V. Ward in Aquatic Sciences (2005)

Article

No Evidence for Adaptive Micro-Evolution to a Decrease in Phosphorus-Loading of a Daphnia Population Inhabiting A Pre-Alpine Lake

Many polluted lakes in Europe are being restored and phosphorus concentrations have dropped dramatically in these lakes. We studied the genetic structure of Daphnia galeata over the past 30 years in Lake Greifens...

Piet Spaak, Barbara Keller in Hydrobiologia (2004)

Article

Amplified Fragment Length Polymorphism (AFLP) Reveals Species-Specific Markers in the Daphnia Galeata–HyalinaSpecies Complex

Daphnia often occur in species complexes that consist of two or more co-occurring species and their hybrids. Hybrid individuals are often capable of sexual reproduction and so backcrossing with introgression occ...

Massimiliano Gili, Michael T. Monaghan, Piet Spaak in Hydrobiologia (2004)

Article

Chemically induced anti-predator defences in plankton: a review

Planktonic organisms exhibit diverse morphological, behavioural and life-history responses to the chemical presence of potential predators. Prey organisms have been found to sense such predators via predator-d...

Sandra Lass, Piet Spaak in Hydrobiologia (2003)