Question

In African cichlid fish, there are > 2000 different species that vary in their craniofacial structure based on whether they are pelagic (live in open water, feeding on smaller fish) or benthic (living at the bottom of the lake, feeding mostly on invertebrates such as snails). They are all derived from a common ancestor that may have left the Nile River and invaded at least three lakes including Lake Victoria, Lake Malawi, and Lake Tanganyika.

Describe how cichlids represent a relationship between the fields of developmental biology and evolution. Then describe another example of this relationship based on your textbook or a different resource. Limit your response to ten sentences. 8 pts

Answer 1

How climate and tectonic processes have changed the hydrological process in East Africa and how it has affected the diversification of cichlid fishes. How do such reviews combine data on cichlid diversity with the highly variable geological and archaeological history of East Africa? And can be seen to serve as an important reference for the influence of geological paleoecological and paleoclimatic factors on biology.

Hybridization is main increasingly recognized as a positive force in the evolutionary diversification of cichlids.

Analysis of meiotic isolation in inter-generic hybrids of cichlid fishes," according to E. Bezelt et al. By hybridizing two different types of tilapia species, it was observed that the genome analyzed meiotic isolation, according to Orochromis niloticus and Sarotherodon melanotheronke in mutual F2 and that the former pattern of isolation was similar to both ancestral species. And such results are seen to play important roles in genome development and provide roles for hybridization in promoting cichlid development.

for past hybridization among divergent Lake Malawi cichlid lineages and thus further highlight the importance of interspecific gene flow for shaping the evolutionary history of East African cichlid fishes. Specifically, highly divergent mtDNA lineages have been found in several species of the Utaka, an informal group of Lake Malawi cichlid species.

Numerous molecular phylogenetic studies predict hybridization between littoral cichlid species in Lake Tanganyika, a phenomenon commonly attributed to recurrent-driven lake level fluctuations that would alter shoreline and habitat structure.

Alternative reproductive tactics in the shell-brooding Lake Tanganyika cichlid Neolamprologus Brevis.

Spawning coordination of mates in a shell brooding cichlid.

The impact of the geologic history and paleoclimate on the diversification of East African cichlids.

Species-specific relationships between water transparency and male coloration within and between two closely related Lake Victoria cichlid species,