Workpackages of Subproject W07

Workpackage WP07.1

Prof. Dr. K. E. Linsenmair, Zoologie III, Theodor-Boveri-Institut, Würzburg, Germany
ke_lins@biozentrum.uni-wuerzburg.de

T. Moritz, Zoologie III, Theodor-Boveri-Institut, Würzburg, Germany
moritz@biozentrum.uni-wuerzburg.de

Species survey, habitat parameters, diet of fish, and terrestrial biomass input into aquatic ecosystems

Short description: Till now complete species lists of many of the investigation areas of the subproject are still missing. As they are pre-condition for exact investigations, they will be completed using different methods to catch fish. The investigated water bodies will be described using plant communities, physical and chemical characters. Stomach analyses are conducted to enlighten the trophic interrelationships. This method has already shown, that terrestrial arthopod input is very important for the aquatic food webs. So it is a further goal of the subproject to determine the terrestrial biomass input into ephemeral waters.

Workpackage WP07.2

Prof. Dr. K. E. Linsenmair, Zoologie III, Theodor-Boveri-Institut, Würzburg, Germany
ke_lins@biozentrum.uni-wuerzburg.de

T. Moritz, Zoologie III, Theodor-Boveri-Institut, Würzburg, Germany
moritz@biozentrum.uni-wuerzburg.de

Lateral migration of fish

Short description: Water bodies, which fill up anew at the beginning of the rainy season, are immedeately settled by fish. Most of them migrate actively from the bigger rivers into these temporal waters. The subproject is working on the questions: Why do these fish migrate and what are the triggering parameters? What habitats and what point of time are preferred by each species? Do they use a single ephemeral water body or several within one rainy season? The individual fish movements will be investigated using transponders.

Workpackage WP07.3

Prof. Dr. K. E. Linsenmair, Zoologie III, Theodor-Boveri-Institut, Würzburg, Germany
ke_lins@biozentrum.uni-wuerzburg.de

T. Moritz, Zoologie III, Theodor-Boveri-Institut, Würzburg, Germany
moritz@biozentrum.uni-wuerzburg.de

Changes of a riverine fish community in a newly dammed barrage

Short description: A new dam was closed at the end of 2002 at Dano/Burkina Faso. The dam was financed by the Dreyer-Stiftung (http://www.dreyerstiftung.de) and planned to allow irrigation agriculture. The artificial lake will also be used for fisheries. The subproject surveys the development of the fish community in the "Barrage de Moutouri" and also stocks suitable local fish species. The potential for aquaculture projects will be revealed.

Workpackage WP07.4

Prof. Dr. K. E. Linsenmair, Zoologie III, Theodor-Boveri-Institut, Würzburg, Germany
ke_lins@biozentrum.uni-wuerzburg.de

T. Moritz, Zoologie III, Theodor-Boveri-Institut, Würzburg, Germany
moritz@biozentrum.uni-wuerzburg.de

Socio-economic aspects of wild fishery and aqua culture in the surveyed savanna areas in West Africa

Short description: This workpackage aims to understand human usage of fish and the socio-economic importance of fishery. Estimations on different species shall be gathered for the region under investigation. Impacts of traditional and modern fishery techniques will be evaluated. Additionally the fisheries culture will be recorded, as it is important to know, what fishes are not allowed to be eaten for religious reasons, before planning any fisheries or aquaculturing development aid project. The possibility of fish farming in rice fields will be assessed.