Dr. Julia Friese

•  Population dynamics
• Predator-prey interactions
• Ecosystem functioning considering spatiotemporal scales
• Effects of small scale habitat utilization patterns on large scale population fitness
• Habitat connectivity
• Fish nurseries

In my current study, I assess anthropogenic impacts on the function and quality of a special fish habitat – the intertidal salt marshes of the German Wadden Sea coast. By tidal flooding salt marsh creeks or even the vegetated marsh surface are temporarily available habitats for fish. Salt marshes are considered worldwide to provide food and shelter for small fishes. To examine the value of this special habitat for fish and brown shrimp, we analyzed seasonal and diurnal abundance patterns and the effects of several biotic (prey densities) and abiotic (e.g. creek morphology, meteorology, hydrology) parameters on fish condition.

Since 04/2014: PhD student at the Institute for Hydrobiology and Fisheries Science (IHF), University of Hamburg, Germany

2010 – 2013: Graduate studies (MSc.) in Marine Ecosystem and Fisheries Science at the Institute for Hydrobiology and Fisheries Science (IHF), University of Hamburg, Germany

Masterthesis: „Spatial distribution of fishing effort in relation to stock status and distribution: assessing criteria of hyperstability derived from fleet behavior of German saithe (Pollachius virens) fishery“
Supervisors: Prof. Dr. Axel Temming, Dr. Alexander Kempf

2007 – 2010: Undergraduate studies (BSc) in Biology at the University of Hamburg, Germany

Bachelorthesis:  „Analyse der trophischen Konkurrenz zwischen ausgewählten demersalen Fischarten der Nordsee unter besonderer Berücksichtigung der räumlichen Skalen“ („Analysis of trophic competition between selected demersal North Sea fish species considering especially spatial scales“)
Supervisors: Prof. Dr. Axel Temming, Dr. Jens Floeter

My PhD study is part of the interdisciplinary junior research group INTERFACE (Interaction of fish, plants, carbon & sediment: management and ecosystem functions of Wadden Sea salt marshes)

Research articles (peer-reviewed)

Friese, J., Temming, A., Dänhardt, A., 2018. Grazing management affects fish diets in a Wadden Sea salt marsh. Estuarine, Coastal and Shelf Science 212, 341–352. link

Oral presentations

Friese, J., 2016. Seasonal shifts in feeding strategies of three-spined stickleback (Gasterosteus aculeatus, L. 1758) in salt-marsh creeks dependent on grazing and flooding events. 56. Annual Meeting of the Estuarine Coastal Sciences Association (ECSA), 4. - 7. September 2016 in Bremen, Germany

Friese, J., 2015. Small-scale habitat utilization patterns of nekton in intertidal saltmarsh creeks. 23. Coastal Ecology Workshop, 01. - 05. November 2015 in Westerhever, Germany

 Friese, J., 2014. Evaluation of habitat quality of German salt marsh creeks for nekton. 22. Coastal Ecology Workshop, 27. - 31. November 2014 in St. Malo, France

Poster

Friese, J., 2015. Evaluation of habitat quality of German salt marsh creeks for fish. Workshop “Conservation Management of Fish Populations in the Wadden Sea“, 08. - 09. January 2015, Thünen Institut, Hamburg, Germany