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Currently, I'm working in the FWF-Project “Trophic pathways of omega-3 fatty acids in stream food webs” (P28902-B25) as a doctoral student. My PhD research is focused on the resource origin, trophic and allocation pathways of omega-3 polyunsaturated fatty acids in neural tissues (brain and eyes) of lotic and feral freshwater fish. We analyzed fatty acids (FAME), bulk (13C and 15N) and compound-specific stable isotopes of FA (C13-FAME) of potential diet sources and aquatic consumers.
1.Overfishing, altered flow regimes, loss of connectivity, pollution and other direct human disturbances have had a significant impact on freshwater fish biodiversity. While direct effects of these disturbances are well documented, some can also lead to changes in the nutritional composition at the base of freshwater food webs and may affect fish g...
There is growing recognition of the importance of food quality over quantity for aquatic consumers. In streams and rivers, most previous studies considered this primarily in terms of the quality of terrestrial leaf litter and importance of microbial conditioning. However, many recent studies suggest that algae are a more nutritional food source for...
The River Continuum Concept implies that consumers in headwater streams have greater dietary access to terrestrial basal resources, but recent studies have highlighted the dietary importance of high-quality algae. Algae provide consumers with physiologically important omega-3 (n-3) polyunsaturated fatty acids (PUFA), particularly eicosapen-taenoic...
According to the River Continuum Concept, headwater streams are richer in allochthonous (e.g. terrestrial leaves) than autochthonous (e.g. algae) sources of organic matter for consumers. However, compared to algae, leaf litter is of lower food quality, particularly ω‐3 polyunsaturated fatty acids (n‐3 PUFA), and would constrain the somatic growth,...
I wonder if someone knows where I could find kind of guided Rcode for QFASAR? Where I can see which steps are taken before contributions of diet sources are estimated? I have the R package menual but it would be nice to have an example.
Dear science friends,
I'm trying to describe biochemical similarities among groups by nmds and anosim (+permutiontests). I wondered if there is a way to compute the confidence area of groups in the nmds space and overlapping area between groups as measure for similarity. Group 1 and group 2 are distinct (0% overlap) while group 3 and 4 were similar in their biochemical composition (40% overlap).
The broad objective of this project is to delineate, a) spatial and seasonal variation in consumer dependence (benthic invertebrates and fish) on elemental (C and N plus C and N stable isotopes) and molecular (lipids and their fatty acids) composition of basal resources along a longitudinal, pre-alpine stream gradient (ecosystem approach), b) under different light conditions, the effect of allochthonous and autochthonous diet sources in headwater streams on dietary supply and retention of fatty acids in headwater benthic invertebrates (experimental approach), and, c) using radioactive hepatocyte bioassays, the ability of freshwater fish to convert precursor fatty acids to DHA to compensate for a lack of dietary DHA (hepatic lipid metabolism in freshwater fish).