The paper "Key and bibliography of the genera of European Trichoptera larvae" by Johann Waringer and Wolfram Graf provides for the first time a synoptic key to the genera of final instar European Trichoptera larvae. The most important characters are illustrated by colour photos, with arrows highlighting the diagnostic features. A short descriptive text gives additional information for each decision and guides the reader through the determination process. A detailed bibliography lists the most important taxonomical papers on European Trichoptera larvae.
Full citation: Waringer J & W Graf (2013) Key and bibliography of the genera of European Trichoptera larvae. Zootaxa 3640 (2): 101-151.
"Better late than never." Two latecomers still from the COMIX project now published in Environmental Microbiology and in Freshwater Science. Stephen Woodcock (now in Australia) and colleagues present a one-dimensional model for the spatial autocorrelation in abundances arising from immigration from some remote community and dispersal between environmentally similar landscape patches (lovely!). Miquel Ribot (from Spain) and colleagues highlight the relevance of benthic biofilms for the transformation of nitrogen from a waste water treatment plant:
Ribot M, Martí E, von Schiller D, Sabater F, Daims H, Battin TJ. 2012. Nitrogen processing and the role of stream benthic biofilms downstream of a wastewater treatment plant. Freshwater Science 31(4):1057-1069
Woodcock S, Besemer K, Battin TJ, Curtis TP & WT Sloan (2012) Modelling the effects of dispersal mechanisms and hydrodynamic regimes upon the structure of microbial communities within fluvial biofilms. Environmental Microbiology, doi:10.1111/1462-2920.12055
Diversity–productivity relationships are largely known from the primary producer level. Based on experiments in mesocosms Maren Striebel, Gabriel Singer, Herwig Stibor and Tom Andersen demonstrate effects of aquatic primary producer (phytoplankton) diversity on higher trophic levels (zooplankton). Phytoplankton diversity increased the means of both zooplankton growth rate and abundance while suppressing their variability, and sustained
higher zooplankton diversity. The results of their study can be found in a recent publication in Ecology.
Peter Peduzzi and colleagues report on the power of Confocal Laser Scanning Microscopy for enumerating virus particles (free-living and attached to transparent exopolymeric particles) in various aquatic systems all over the world, among them the ”Dorfteich” in Riegersburg (Austria), the Nile River in Egypt, the Atlantic Ocean including also a deep sea Riftia field (sampled by the submersible “ALVIN”). Read more on the journal homepage.
Glaciers store organic matter, which is released to alpine streams by glacial melt. In the light of global warming and disappearing glaciers worldwide, a team from DeLi set out to explore the organic matter from 30 glaciers distributed throughout the Austrian Alps. In Nature Geoscience, Gabriel Singer, Christina Fasching and colleagues report about the unexpectedly high molecular diversity of organic matter stored in European glaciers and the contribution of this highly bioavailable organic carbon pool to microbial metabolism in downstream lotic ecosystems. Read more here and access the full story on Nature Geoscience.
Elisabeth Schludermann, Michael Tritthart, Paul Humphries and Hubert Keckeis published their latest results on the dispersal and retention of nase carp (Chondrostoma nasus) larvae in the River Danube in The Canadian Journal of Fisheries and Aquatic Sciences. In their paper, entitled "Dispersal and retention of larval fish in a potential nursery habitat of a large temperate river: an experimental study", Schludermann and colleagues investigate drift patterns of these fish larvae using a combination of field experimental methods (fish marking and measurement of hydraulic conditions) and hydrodynamic modelling. Read the abstract here.
Michael Schagerl´s team published two papers about the alkaline-saline ecosystems in the East African Rift Valley.
The first paper deals with flamingo migrations between alkaline-saline lakes. We hypothesised that changes in nutritional composition and quality of the pelagic phytoplankton community influence the occurrence of Lesser Flamingo populations. In Lake Nakuru, Lesser Flamingos had a significant positive relationship with lipids and Arthrospira biomass but a negative relationship with small cyanoprokaryotes. For Lake Bogoria, no significant differences were observed as the Arthrospira was available throughout the sampling period though the flamingo numbers still fluctuated. We concluded that the nutritional composition and quality of the phytoplankton community influence the temporal and spatial abundance of Lesser Flamingos although other factors such as the prevailing environmental conditions may take precedence.
In another study, 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 unique nature of tropical saline systems. The size spectrum of ingested particles was broad and even included filamentous cyanobacteria such as the commonly dominating Arthrospira fusiformis. Feeding selectivity on cyanobacteria, however, was rather low showing higher values for cryptomonads and small ciliates. Bacterial biomass was favoured by the presence of grazers, as small bacterivorous predators were reduced at an average of 13.9%, showing the cascading effect of large zooplankton on the food web structure. Overall, based on this first-time study of the microzooplankton feeding behaviour in East African soda lakes, a strong structuring effect of rotifers and large ciliates on microbial plankton communities is assumed, especially in times of high consumer biomass. DOI 10.1007/s10750-012-1023-2
Peter Peduzzi & Birgit Luef are contributors to the new book “Plankton of Inland Waters“. This is a derivative work of the best-selling major reference work “Encyclopedia of Inland Waters”. The article “VIRUSES“ was selected in its entirety to appear in this specialized publication priced more appropriately to the end-user market. Reference: Peduzzi, P. & B. Luef, 2011: Viruses. In G.E. Likens (ed.): Plankton of Inland Waters. Academic Press (San Diego); pp. 83-98
Ed Hall leaves us another legacy from his famous series of FUTURE experiments conducted during his time at DeLi. Together with Katharina Besemer and colleagues Ed reports about effects of resource chemistry on stream hyporheic biofilms. Targetting phosphorus, they found a surprise: It´s arsenic... no, manganese actually! Read more in their paper: Hall EK, Besemer K, Kohl L, Preiler C, Riedel K, Schneider T, Wanek W & TJ Battin (2012) Effects of resource chemistry on the composition and function of stream hyporheic biofilms. Frontiers in Microbiology 3: Article 35, doi: 10.3389/fmicb.2012.00035. Link to journal.
Katharina Besemer and coauthors use terminal-restriction fragment length polymorphism and 454 pyrosequencing to describe the assembly of stream biofilms from suspended stream water communities. Find more about their results in the ISME Journal publication: Besemer K, Peter H, Logue JB, Langenheder S, Lindström ES, Tranvik LJ & TJ Battin (2012) Unraveling assembly of stream biofilm communities. The ISME Journal in press. Link to journal.
Andreas Weilhartner and coauthors report about nitrate and phosphate impacts of gravel pit lakes... and actually these man-made ecosystems reduce levels of these nutrients in the outflowing groundwater. Find details in the recent publication: Weilhartner A, Muellegger C, Kainz M, Mathieu F, Hofmann T & TJ Battin (2012) Gravel pit lake ecosystems reduce nitrate and phosphate concentrations in the outflowing groundwater. Science of the Total Environment 420: 222-228. Link to journal.
Iris Hödl and colleagues used Voronoi tessellation, a geometrical space-separating technique, on microscopic photographs to describe single cell distribution of biofilm-forming bacteria in a near-natural stream environment. Their findings indicate biological interactions such as cell-cell signalling or substratum surface conditioning to be of surprising importance already during very early biofilm formation stages. Read the article here.
Peter Akoll has successfully defended his PhD at DeLi in March 2011. His findings about fish parasites in Nile tilapia and African catfish have now been published in a series of papers:
Akoll P, Konecny R, Mwanja MW, Nattabi KJ, Agoe C & F Schiemer (2011) Parasite fauna of farmed Nile tilapia (Oreochromis niloticus) and African catfish (Clarias gariepinus) in Uganda. Parasitology Research, doi: 10.1007/s00436-011-2491-4 Link to journal.
Akoll P, Fioravanti ML, Konecny R & F Schiemer (2011) Infection dynamics of Cichlidogyrus tilapiae and C. sclerosus (Monogenea, Ancyrocephalinae) in Nile tilapia (Oreochromis niloticus L.) from Uganda. Journal of Helminthology, doi: 10.1017/S0022149X11000411 Link to journal.
Akoll P, Konecny R, Mwanja WW & F Schiemer (2011) Infection patterns of Nile tilapia (Oreochromis niloticus L.) by two helminth species with contrasting life styles. Parasitology Research, doi: 10.1007/s00436-011-2649-0 Link to journal.
Johann Waringer and colleagues add yet another larval description of a European caddisfly species in a new article in Limnologica. The newly described larva of Drusus mixtus, a caddisfly restricted to the Swiss and French Jura, was unknown so far but can now be identified. While of the genus Drusus only two more European species remain unknown in their larval stage, in the subfamily Drusinae 54 species remain to be identified and described in their larval stage. In a new FWF-funded project, Johann Waringer and colleagues aim to complement existing larval identification keys and collect autecological information of this important bioindicator group showing a high degree of specialisation and endemism. Furthermore, they aim to explore the potential bioindicatory use of Drusinae as early warning systems for climate-change induced threats to biodiversity in high-mountain habitats.
Philipp Oberrisser and Johann Waringer report about mayfly drift induced by salamander presence in Freshwater Biology. Baetidae mayflies avoid predators and shift drift patterns towards the nighttime when salamanders are present, salamander kairomones may induce the behavioral change compared to a stream reach without predators. Abstract and full article here.
Two new papers by Mary Kaggwa, Fasil Degefu, Michael Schagerl and colleagues focus on the question, if small sized fish-cage farming influences the trophic state of ponds:
Kaggwa, M., Liti, D. and M. Schagerl (2011) Small tropical reservoirs and fish cage culture: a pilot study conducted in Machakos district, Kenya. Aquaculture International, accepted.
Degefu, F., Mengistu, S. and M. Schagerl (2011) Potential Influence of Fish Cage Farming on Water Quality and Plankton in Fish Ponds: A Case Study in the Rift Valley and North Shoa Reservoirs, Ethiopia. Aquaculture, accepted.
In his doctoral thesis in 1942 Jacques Monod described a phenomenon now widely distributed in microbiology textbooks and known as diauxic growth or - in a more modern phrasing - carbon catabolite repression. Using micro-autoradiography Gabriel Singer and colleagues show how this mechanism controls the spatial distribution of uptake of carbohydrate monomers in stream biofilms and leads to a micro-scale "metabolic stratification" within biofilms with potential consequences for stream ecosystem functioning.
Singer G, Besemer K, Hochedlinger G, Chlup A-K & Battin TJ. (2011). Monomeric carbohydrate uptake and structure-function coupling in stream biofilms. Aquatic Microbial Ecology 62: 71-83.
Michael Schagerl and his colleagues generated a mass-balance model to
figure out the food web structure and trophic interactions of major
functional groups of the Ethiopian highland Lake Hayq. The study lay
down baseline data for future ecosystem-based investigations and
Tadesse Fetahi, Michael Schagerl, Seyoum Mengistou, Simone Libralato (2011). Food web structure and trophic interactions of the tropical highland lake Hayq, Ethiopia. Ecological Modelling 222: 804–813. PDF will be sent on demand.
A new Mini-Review in the journal Ecosystems authored by Ed Hall and Tom Battin along with colleagues from The Dept. of Microbial Ecology, The Department of Chemical Ecology, IIASA, and The Institute for Mummies and the Ice Man integrates ecological theory with microbial ecology using a suite of novel single cell techniques. Hall and colleagues lay out a conceptual model that shows how microbial community stoichiometry can be deconstructed into constituent; populations, cells and macromolecules, in a hierarchical manner. They demonstrate how deciphering the underlying variance in microbial community stoichiometry may lead to a better understanding of whether the microbes will act as a source or sink of mineral nutrients in a wide variety of environments. A link to a preprint will be made available shortly.
New paper in FEMS Microbiology Ecology on biofilm colonization.