Sentences with phrase «of cichlid»

Finally, we collaborate with Lauren Chapman of McGill University (Montreal, Canada) to study the role of phenotypic plasticity (changes induced by the environment) and genetic assimilation in the process of adaptation and evolutionary change of cichlid fishes.

When their eggs were taken away for a prolonged period, the females of a cichlid fish species ate both their own eggs and foreign eggs.

He hoped to discover how some species of cichlid had survived the introduction of the Nile perch.

Researchers have found that one species of cichlid uses urine to send chemical signals to rivals during aggressive displays.

But after the Nile perch was introduced — for commercial reasons — in the 1950s, and the lake also experienced substantial eutrophication, about half of the cichlid species became extinct.

But while a number of cichlid species, feeding largely on crustaceans or plants, managed to adapt and recover, of the 100 or so species which, like the Nile perch, live on larger fish, more than 80 became extinct.

That leaves about 90 million years of cichlid history unaccounted for.

The reason for this may be a consequence of the way of life of this cichlid species: The females deposit their eggs in breeding caves and care for them intensively.

Richard Francis and his colleagues at the University of Oregon in Eugene and the University of Washington in Seattle studied a species of cichlid fish found in Lake Tanganyika.

«Evolutionary biologists observe parallel, repeated evolution of cichlid fish in Nicaragua.»

Konstanz evolutionary biologists working with Prof. Axel Meyer have now described parallel evolution of two closely related, but geographically isolated populations of cichlid fish in Nicaraguan crater lakes.

There are over 250 species of cichlid in the lake: their presence seems to have blinded biologists to other examples of evolution in action occurring there.

The extraordinary diversity of cichlid fishes challenges entrenched ideas of how quickly new species can arise

For the study, published this week in the journal The American Naturalist, researchers used the Neolamprologus pulcher (N. Pulcher) breed of cichlid, primarily found in Lake Tanganyika — the great African freshwater lake that feeds into the Congo River.

Fernald studies Astatotilapia burtoni, one of the hundreds of cichlid fish species inhabiting Lake Tanganyika in eastern Africa, because of the unique ways they have evolved over time.

«This combination of characters is particularly interesting, because molecular geneticists have shown that many of the cichlid species in Lake Tanganyika possess «mosaic» genomes — made up of genetic material derived from non-related species.

Unfortunately, fossil specimens that could help to trace earlier phases of cichlid evolution are quite rare, and most are poorly preserved and / or fragmentary.

Neolamprologus obscurus is a highly sociable species of cichlid found only in the southern reaches of Lake Tanyanika.

Most species of cichlid live in three lakes in Africa's Great Rift Valley.

«Our fossil supports the hypothesis that hybridizations played a more prominent role in cichlid speciation than was once thought — and that diversification of the cichlids now endemic to the lake did not begin in the lake itself,» Reichenbacher says.

The basin now occupied by Lake Tanganyika came into being at least 5.5 million years ago, and it has been assumed that the species radiation that gave rise to the striking diversity of cichlids in the lake was triggered by its formation.

Lake Malawi, shared by Malawi, Mozambique, and Tanzania, is home to at least 500 species of cichlids, all of which probably took less than a million years to evolve from a common ancestor.

The researchers then took photographs of the cichlids at six different times during development and compared these with each other.

Other fish in Africa, such as populations of cichlids, are being eliminated due to changing agricultural practices.

He and his colleagues assembled a database of known fossils of cichlids.

They sequenced 10 nuclear genes from 89 modern species of cichlids and 69 other fish to come up with dates when cichlids diverged from their fishy relatives.

More than 1600 species of cichlids swim in fresh water around the world, spanning a rainbow of colors and a myriad of shapes.

Researchers have discovered that the lake's more than 500 types of cichlids all evolved from just a few species.

She has three wonderful brown tabby cats, a Catahoula mixed breed dog, an array of cichlids, as well as a two - legged girl who regularly poses as a lion, dog and cat.

Are you interested in a historical perspective on, for example, «Soviet and U.S. Professional and Technical Manpower» or the «Breeding Behavior of Cichlids»?

Not exact matches

The cichlid, a small fish, has one of the most incredible visual systems known — which allows it to adapt to differently colored environments.

While some of the fish were left alone, others were exposed to what looked like a predator — a doll version of a guppy - eating fish called a pike cichlid.

And cichlid mothers who spend weeks with their mouths full of eggs, waiting for them to hatch.

But even seasoned cichlid researchers like myself are still being surprised by new evidence of their diversity.

The first cichlid was described in 1864 after a botanist on one of David Livingstone's expeditions sent back some dried skins to the Natural History Museum in London for identification.

Over a remarkably short period, cichlids in the African great lakes have spawned hundreds of new species, with an enormous range of characteristics.

If our estimates are correct, there could be twice as many cichlid species in these three lakes as there are freshwater fish in the whole of Europe and North America.

«I don't necessarily care what the taxonomic rank would be of the units I'm studying,» says Hey, whose current research involves cichlid fish in Lake Malawi.

«But what is interesting within cichlids, which is this group of very diverse fishes, is that they can express different sets of these seven genes.

And the descendants of that fish, now called cichlids, continue to swim the fresh waters of both Africa and South America.

The opsin genes of Amazonian cichlids.]

African cichlids, whose visual systems are well studied, evolved in fairly clear, calm, blue lakes with plenty of sunlight.

Cichlids have some of the most incredible visual systems known.

Cichlid fishes have undergone a mind - boggling degree of speciation.

Moreover, the results are consistent with molecular genetic data relating to the ongoing diversification of the family in the Great Lakes region of East Africa, which have indicated that hybridization between members of related species or even genera has played a major role in cichlid speciation.

Like Charles Darwin's famous finches, which evolved a wide range of beak shapes and sizes to exploit the different foods available in the Galápagos Islands, these cichlids represent a textbook example of what biologists term an adaptive radiation — the phenomenon whereby one lineage spawns numerous species that evolve specializations to an array of ecological roles.

Now scientists around Ludwig - Maximilians - Universitaet (LMU) in Munich paleontologist Professor Bettina Reichenbacher have described a new fossil cichlid discovered in Upper Miocene strata in East Africa, which provides new insights into the evolutionary history of the group.

The new fossil displays a striking «mosaic - like» set of characters, combining traits that are typical for three distinct cichlid groups found in Lake Tanganyika today.

«This unique resource has made it possible for the first time to place a new fossil species securely within the phylogeny of African cichlids.

Male cichlid fish battle for stretches of lake - bottom territory where females lay their eggs.