TY - JOUR
AU - Hoogerhoud, R.J.C.
AB -  THE ECOLOGICAL DIFFERENTIATION OF TWO CLOSELY RESEMBLING HAPLOCHROMIS SPECIES FROM LAKE VICTORIA (H. IRIS AND H. HIATUS ; PISCES, CICHLIDAE) by R. J. C. HOOGERHOUD, F. WITTE and C. D. N. BAREL (Projectgroup Ecological Morphology, Zoologisch Laboratorium, Rijksuniversiteit Leiden, P. O. Box 9516, 2300 RA Leiden, The Netherlands; Haplochromis Ecology Survey Team-HEST-, Mwanza, Tanzania) SUMMARY In external appearance and in standard taxonomic analysis Haplochromis iris and H. hiatus, are closely resembling species, which morphologically mainly differ in the live col- ours of sexually active males (Plate I) and, with marginal overlap, in the number of gill-lamellae, the size of the swimbladder and fat content. Ecologically the two species demonstrate (again with overlap) differences in bathymetric distribution, breeding periods, relative contributions of their (otherwise same) food items and in nematode infection. The relation between these ecological differences and the relation between ecological and morphological differences is analysed. The results corroborate the biological validity of the species rank, which hitherto was based on morphology only. The data and their interpretation lead to a discussion on bathymetric segregation as a speciation mode for lacustrine cichlids. Finally the possible role of trophic polymorphs in the radiation of Lake Victoria haplochromines is considered. 
TI - The Ecological Differentiation of Two Closely Resembling Haplochromis Species From Lake Victoria (H. Iris and H. Hiatus ; Pisces, Cichlidae)
JF - Netherlands Journal of Zoology (in 2003 continued as Animal Biology)
DO - 10.1163/002829683X00147
DA - 1982-01-01
UR - https://www.deepdyve.com/lp/brill/the-ecological-differentiation-of-two-closely-resembling-haplochromis-4D0ezx1K6C
SP - 283
EP - 305
VL - 33
IS - 3
DP - DeepDyve
ER -