. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 302 O. Seehausen & N. Bouton. Materials and methods Over a period of two and a half years (from January 1990 through July 1991, March to May 1992, September through December 1993 and February to April 1995) cichlids were sampled at the km2 (75 000 m2) small rocky Makobe Island which lies 5 km offshore in the Speke Gulf entrance (Fig. 1). Makobe Island is an example of gently sloping islands with small to medium sized rock boulders and moderate geographical
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 302 O. Seehausen & N. Bouton. Materials and methods Over a period of two and a half years (from January 1990 through July 1991, March to May 1992, September through December 1993 and February to April 1995) cichlids were sampled at the km2 (75 000 m2) small rocky Makobe Island which lies 5 km offshore in the Speke Gulf entrance (Fig. 1). Makobe Island is an example of gently sloping islands with small to medium sized rock boulders and moderate geographical isolation. Sampling was done from the surface down to 6 m depth with gillnets of mesh sizes between 1 and 2 inches and by angling in rock pools and rocky crevices. The total sampling effort consisted of over 48 000 m2 net hours and over 300 hours angling. Additionally underwater censuses were done by snorkeling. Relative abundances were determined with all three techniques. Micro- habitat distribution of the species was scored by restricting samples to areas of one to a few square meters of rather uniform depth, exposure and rock cover. Stomach contents of some individuals of each species were analyzed individually to identify food organisms. The contents of 40 individuals per species (each 10 from four seasons) were then centrifuged and quantified. It is necessary to study not only diet composition and spatial distribution but also how the food is obtained. We performed feeding experiments in the laboratory with the very species whose diet was analyzed. We studied the behaviour of fish feeding in experimental aquaria on Aufwuchs (algae and associated fauna) covered rocks from their natural habitat. After collection from the lake the fish were kept in aquaria without food for 40—48 hours and were then offered Aufwuchs-covered stones from the lake. Feeding behaviour was scored over a period of 30 minutes with two or three individuals per. Please note that these images are ex
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