Cichlid fishes compose an astonishingly large number of species and formed species flocks in record-breaking time. To facilitate efficient genome scans and comparisons of cichlid genomes, we constructed a medium-density genetic linkage map of microsatellite markers of Astatotilapia burtoni. The mapping cross was derived from two inbred laboratory lines to obtain F(2) progeny by intercrossing. T...

We have found evidence for ultraviolet visual capabilities in a Lake Malawi cichlid fish, Metriaclima zebra. Microspectrophotometry of single cones revealed a visual pigment with peak sensitivity at 368+/-4 nm. M. zebra also expresses a putative ultraviolet opsin gene whose sequence is closely related to the SWS-1 opsin for other fishes. Several other African cichlids have a functional copy of ...

Key Points  Functional orthodontic techniques have been used to correct dentofacial deformities such as parrot mouth in the young horse.  An understanding of the orthodontic principles of tooth movement and the effects of forces on bone growth will insure the best surgical outcome.  The combined approach with retention wires of the upper jaw combined with a fixed acrylic and aluminum incline...

The coexistence of species with overlapping resource use is often thought to involve only negative fitness effects as a consequence of interspecific competition. Furthermore, the scarce empirical research on positive species interactions has predominantly focused on sessile organisms. Here, I experimentally assessed the effect of close proximity of a potential brood predator and competitor on r...

ß & R. I-I. BELTERMAN. 1980. The somatic chromosomes of three parrots: the Kea (Nestor notabilis), the Yellow-headed Parrot (Amazona ochrocephala) and the Grey Parrot (Psittacus erithacus). Acta Zool. Pathol. Antverpiensia 75: 9-18. JENSEN, R. A. C. 1975. Application of a simple chromosome technique in field studies. Emu 74 (Suppl.): 321. Lv, M. R. 1969. A widely applicable technique for direct...

The world's largest parrot has proved a conservation challenge.

The role of hybridization in the evolution of animal species is poorly understood. Transgressive segregation is a mechanism through which hybridization can generate diversity and ultimately lead to speciation. In this report we investigated the capacity of hybridization to generate novel (transgressive) phenotypes in the taxonomically diverse cichlid fishes. We generated a large F2 hybrid popul...