[Mitarbeiter.zoologie] Fwd: [MEMBERS] NEXT WEEK: sBIOMAPS working group at the seminar series

[Robert Paxton]

Dear All,

Michal is well known for his work on pollen stoichiometry and bee nutrition. His talk is on-line on Wednesday.

Best wishes,

Robert



> Begin forwarded message:
> 
> From: "Reiche, Anne" <anne.reiche at idiv.de>
> Subject: [MEMBERS] NEXT WEEK: sBIOMAPS working group at the seminar series
> Date: 25 November 2022 at 15:09:27 CET
> To: "all at idiv.de" <all at idiv.de>, "members at idiv.de" <members at idiv.de>, "assoc.members at idiv.de" <assoc.members at idiv.de>, "seminar at idiv.de" <seminar at idiv.de>
> 
> Dear all,
> next week, we are looking forward to welcome Michał Filipiak <https://twitter.com/michaelfilipiak?lang=en> from the sDiv working group sBIOMAPS <https://www.idiv.de/en/sbiomaps.html> at the seminar series.
> 
> Wednesday, 30 November 2022 at 1 pm
>  
> remote
>  
> https://uni-leipzig.zoom.us/j/69177272174?pwd=YnJFUEtXbERvb3VCRjVWNGs0VW5Kdz09
>  
> Meeting-ID: 691 7727 2174
> Passcode: 454864
>  
> “Why and how to measure nutrient demand and supply for organisms: the extreme feeding strategies of xylophages and pollen eaters”
> 
> Abstract: When the chemical compositions of consumers tissues and their foods are mismatched, major life history traits and fitness are affected. Adult bodies are already built; therefore, their functionality is limited mainly by energy. Nevertheless, the ability to build an adult's fully functional body is influenced by the availability of specific body-building nutrients during an organism's juvenile stage. Hence, limitations experienced during the juvenile stage influence life history traits, physiology and morphology (e.g., adult size, adult condition, adult fertility, length of juvenile development, lifespan,  functioning and size of organs, mortality, etc.) and thus the fitness of the adult and shape ecological interactions.
> 
> All of the diversity of life and all interactions between lifeforms that we are able to comprehend have their mechanical origin in ~25 chemical elements endlessly cycling in food webs. Organisms are comprised of organic molecules. However, organic compounds are mutable and short-lived and play a role only in direct nutritional interactions between a specific consumer and its host. Conversely, immutable atoms of chemical elements cycle in ecosystems. Therefore, by acknowledging that the production of every molecule, and consequently, of the whole organism, is limited by the stoichiometry of each molecule, one is able to link organisms to ecosystems, and bring the context of consumer nutritional needs to nutrient cycling studies.  <>
> In this context, under the framework of ecological stoichiometry, a convenient tool was proposed that facilitates identifying and comparing the fitness-limiting effects imposed on organisms by their food's nutritional composition: the trophic stoichiometric ratio (TSR). The TSR uses the ratio of C:other multiple chemical elements (more than the commonly studied C:N:P) as a proxy for the nutritional mismatch between a consumer and its food.
> 
> Using the TSR I examined examples of the life histories herbivores representing the extremes of the feeding strategies: (1) nutrient-deficient dead wood exploited by xylophages and (2) nutrient-rich pollen used by bees.
> 
> Xylophages are extremely limited nutritionally. The nutritional constraints are offset only in part with extended development time. However, the main factor allowing for the mitigation of nutritional limitation is fungal action. Fungi nutritionally improve dead wood, translocating externally occurring nutrients to decaying stumps. This way the decomposition process is made possible by fungi creating stoichiometric niches that are optimal for other consumers.
> 
> In contrast, the pollen eaten by bees is nutritionally very rich. Nonetheless, it is not well balanced stoichiometrically and is highly variable among taxa. Because of a high taxonomic diversity of pollen stoichiometry, to stoichiometrically balance the diet, bees might need key pollen species with desirable stoichiometries. This way the pollination service is nutritionally stimulated by available stoichiometric niches in landscapes populated by wild bees.
> 
> TSR might be used in studies working with whole food webs and with nutritional flows inside and between ecosystems that are driven by consumers facing specific nutritional limitations. Likewise, TSR might be applied to the study of multidimensional stoichiometric niches of coexisting species that theoretically occupy similar ecological niches but that might use food resources with different stoichiometries. The studies concerning life history evolution and optimization could also use TSR because this index enables the detection of limiting stoichiometric mismatches and comparisons between various taxa, habitats and foods. Most importantly, for now, the most feasible and handy way to add consumer context to the nutritional cycle is through TSR. Otherwise, to get the data thatTSR models, we would have to perform an impossible number of feeding experiments on a huge number of species, most of them virtually impossible to culture.
> 
>  
> 
>  
> Best wishes and have a nice weekend,
>  
> Anne
>  
>  
> Anne Reiche
> Administrative Assistant
> German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
>  
> Phone: +49 341 97 33103
> Room: A.01.05
> Email: anne.reiche at idiv.de <mailto:anne.reiche at idiv.de>
> Website: www.idiv.de <http://www.idiv.de/>
>  
> Postal address:
> German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
> Puschstrasse 4
> 04103 Leipzig, Germany
>  
> iDiv is a research centre of the DFG – Deutsche Forschungsgemeinschaft
>  
> iDiv is a central facility of Leipzig University within the meaning of Section 92 (1) of the Act on Academic Freedom in Higher Education in Saxony (“Sächsisches Hochschulfreiheitsgesetz, SächsHSFG”). It is run together with the Martin Luther University Halle-Wittenberg and the Friedrich Schiller University Jena, as well as in cooperation with the Helmholtz Centre for Environmental Research – UFZ.
> The following non-university research institutions are involved as cooperation partners: the Helmholtz Centre for Environmental Research (UFZ), the Max Planck Institute for Biogeochemistry (MPI BGC), the Max Planck Institute for Chemical Ecology (MPI CE), the Max Planck Institute for Evolutionary Anthropology (MPI EVA), the Leibniz Institute DSMZ–German Collection of Microorganisms and Cell Cultures, the Leibniz Institute of Plant Biochemistry (IPB), the Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) and the Leibniz Institute Senckenberg Museum of Natural History Görlitz (SMNG).
>  
> USt-IdNr. DE 141510383
>  
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