. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 234 R. van den Elzen, H. Nemeschkal & H. Classen General size and shape patterns The score arrangements of these 10 representatives within the whole sample of Afrotropical species along the PCs are shown in Fig. 7. Ochrospiza atrogularis, the smallest and best-flying species, prefers the open country; it is typical for its con- geners and feeds both on the ground and in shrubby vegetation, but nests preferably in trees. The neighbouring clusters unite three spec
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 234 R. van den Elzen, H. Nemeschkal & H. Classen General size and shape patterns The score arrangements of these 10 representatives within the whole sample of Afrotropical species along the PCs are shown in Fig. 7. Ochrospiza atrogularis, the smallest and best-flying species, prefers the open country; it is typical for its con- geners and feeds both on the ground and in shrubby vegetation, but nests preferably in trees. The neighbouring clusters unite three species-pairs: Alario alario with Pseudochloroptila totta in size and shape, Dendrospiza scotops with Serinus canicollis and Serinops flaviventris with Crithagra gularis in size only. D. scotops and S. canicollis are birds of mountain and forest environments. Their shape differences are greater than those between Serinops flaviventris and Crithagra gularis, two species with part- ly overlapping distributional ranges (Table 5). In our sample Crithagra leucoptera is only represented by a single individual. Nevertheless, its overall size seems to be equal to that of Crithagra sulphurata, but its shape is different. Both meet in the same en- vironment, but food items as well as food size differ significantly (Milewsky 1978). The congeneric C. albogularis is shaped similarly to D. scotops and C. leucoptera, but considerably larger. In general the 10 species cluster almost regularly upon the size axis (PC I). Distribu- tions along the shape axis will show, if we compare our examples with the whole set of African canaries, that emphasis is laid rather on pectoral elements than on characters of the hindlimbs. Beak features Beak characters separate species arrays in a different manner. Again, PC I as the size divides species to a greater amount than the shape axis. The general arrangement assumes exclusion of a per chance distribution (Fig. 8).. 1 D. scotops 2S. flaviventris 3 C. leucopter
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