Michael Schagerl

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Andrew C. Parnell5
H. C. Berg5
A. A. Hirata5
Alexander Wacker5
D. F. Squires5
12Kiplagat Kotut
12Wei Luo
12Lothar Krienitz
11Pawan K. Dadheech
11Doris Krienitz

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2012
2016

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Ecomorphological variability of Arthrospira fusiformis (Cyanoprokaryota) in African soda lakes
The filamentous spirally coiled cyanoprokaryote Arthrospira fusiformis is found in extremely high densities in tropical soda lakes acting as driving force of the food web. We studied pronounced temporal morphological changes of Arthrospira in Kenyan soda lakes, Nakuru and Bogoria, and identified underlying key factors. Cell (diameter and height) and… (More)
A detailed time series assessment of the diet of Lesser Flamingos: further explanation for their itinerant behaviour
We hypothesised that changes in nutritional composition and quality of the pelagic phytoplankton community influence the occurrence of Lesser Flamingo populations in two Kenyan saline–alkaline lakes, Nakuru and Bogoria. This was achieved by carrying out a detailed time series assessment of the phytoplankton community composition and nutritional components… (More)
The virus's tooth: cyanophages affect an African flamingo population in a bottom-up cascade
Trophic cascade effects occur when a food web is disrupted by loss or significant reduction of one or more of its members. In East African Rift Valley lakes, the Lesser Flamingo is on top of a short food chain. At irregular intervals, the dominance of their most important food source, the cyanobacterium Arthrospira fusiformis, is interrupted. Bacteriophages… (More)
Microzooplankton feeding behaviour: grazing on the microbial and the classical food web of African soda lakes
We investigated the feeding behaviour of the dominant microzooplankton of saline lakes in the East African Rift Valley. A set of grazing experiments revealed high ingestion rates of the two euryhaline rotifers Brachionus dimidiatus and Brachionus plicatilis and of the large-sized omnivorous ciliates Frontonia sp. and Condylostoma magnum reflecting the… (More)
The phytoplankton community of tropical high-mountain crater lake Wonchi, Ethiopia
Atelomixis influences phytoplankton composition in regions where day–night temperature variations are high. Although this physical process is shown as the most important driver in a number of tropical–subtropical lake systems, information on tropical high-mountain lakes is largely lacking. We therefore studied the phytoplankton community composition and the… (More)
Species-specific separation of lake plankton reveals divergent food assimilation patterns in rotifers
SUMMARY 1. The analysis of functional groups with a resolution to the individual species level is a basic requirement to better understand complex interactions in aquatic food webs. Species-specific stable isotope analyses are currently applied to analyse the trophic role of large zooplankton or fish species, but technical constraints complicate their… (More)
Reifegradmodell Industrie 4.0 - Ein Vorgehensmodell zur Identifikation von Industrie 4.0 Potentialen
Zahlreiche Kongresse, Tagungen und Symposien werden unter dem Begriff " Industrie 4.0 " abgehalten.Für eine breite Anwendung in Unternehmen fehlt es oft an Umsetzungsideen mit entsprechender Bewertungsmöglichkeit. Das Reifegradmodell Industrie 4.0 ist ein strategiegeleitetes Vorgehensmodell für Unternehmen, dasi nden Dimensionen Daten, Intelligenz und… (More)
Benthic‐pelagic coupling drives non‐seasonal zooplankton blooms and restructures energy flows in shallow tropical lakes
Zooplankton blooms are a frequent phenomenon in tropical systems. However, drivers of bloom formation and the contribution of emerging resting eggs are largely unexplored. We investigated the dynamics and the triggers of rotifer blooms in African soda-lakes and assessed their impact on other trophic levels. A meta-analysis of rotifer peak densities… (More)
Hidden genetic diversity in the green alga Spirogyra (Zygnematophyceae, Streptophyta)
The unbranched filamentous green alga Spirogyra (Streptophyta, Zygnemataceae) is easily recognizable based on its vegetative morphology, which shows one to several spiral chloroplasts. This simple structure falsely points to a low genetic diversity: Spirogyra is commonly excluded from phylogenetic analyses because the genus is known as a long-branch taxon… (More)
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