2. Behavioral Biology TALKS - Deutsche Zoologische Gesellschaft

TALKS
simultaneously and interactively affect Daphnia‘s performance. Daphnia may adjust
its metabolic pathways, respond in its behaviour, and change its ecological
interactions within food webs. I will give a couple of examples for assessing
nutritional constraints that involve chemical analyses to reveal consumer-diet
imbalances, experimental series with measurements of growth and reproduction,
dietary supplementation approaches, and will stimulate a discussion about the
potential of new approaches to identify and quantify the intensity of nutritional
limitation of animals.
S�1 Mathilde Cordellier R513 / 12:00
Tiny European Daphnia, a newcomer in eco- and paleogenomics
Authors: Mathilde Cordellier 1 , Maike Herrmann 1 , Pia Kreuzer 1 , Klaus Schwenk 1
Affiliation: 1 Biodiversity and Climate Research Centre, Frankfurt
Daphnia species, among other resting-stage producing organisms, have a unique
potential for evolutionary studies. With the ability to obtain resurrected individuals
from past populations, it is possible to address basic evolutionary and ecological
questions, such as the pace of adaptation and its mechanisms. I will present here the
results of a multi-disciplinary approach to evaluate the response of European
Daphnia galeata populations to anthropogenically caused environmental changes,
such as global warming. Using a combination of neutral (e.g. microsatellites) and
temperature related candidate gene regions, we investigated gene frequency
changes in space and time. By contrasting population differentiation measured
through F-statistics, we could show how geographical distance and environmental
differentiation shape genetic diversity across a latitudinal gradient and between
different time periods (covering several decades). In a second part, I will report on
the progress made with developing resources for genome-wide studies in Daphnia
galeata (Daphnia Genomics Consortium). First results of a combined analysis using
transcriptome data and genetic variation at temperature-related genes (candidate
genes) among natural populations revealed highly divergent mutation rates in in
exon and intron regions and a strong signature of directional selection. Further
studies using paleogenomic approaches will allow us to predict the evolutionary
potential and trajectory of this keystone species in European lake ecosystems.
S�2 Barbara Pietrzak R513 / 12:15
Evolutionary demography of ontogenesis and senescence in Daphnia
Author: Barbara Pietrzak
Affiliation: 1 Max Planck Institute for Demographic Research, Rostock
Survival and reproduction determine fitness of an organism. Understanding
evolutionary and ecological processes that shape birth and death of individuals and
populations is thus crucial to understanding evolutionary dynamics. Daphnia has
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